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Features
2,000 counts LCD display LQFP 100L package 3V DC power supply ADC Conversion rate : 3 times/s Full automatic measurement ＊ V oltage measurement : 200.0mV, 2.000V – 1000V ＊ Current measurement : μA/mA/A ＊ Resistance measurement : 20.00Ω – 200.0MΩ ＊ Capacitance measurement : 2.000nF – 20.00mF ( Taiwan patent no.: 323347, 453443 ) ＊ Not contact AC electric field detection ＊ Frequency counter : 200.0Hz – 20.00MHz AC/DC voltage scan mode (support LoZ) Diode measurement & continuity check Hazardous AC/DC voltage (HV) indication (Taiwan patent no.: 517823) 4 ADP modes with external reference voltage and independent “ADP” user-defined segment on LCD Temperature mode with internal scale translation circuit from 0C to 0F K-type thermocouple reference table compensation (-200 ~ 1350oC range) Push function : ＊ AC VAHz function ＊ ACV 3-Phase rotation indication ＊ MAX/MIN/REL function ＊ Zero function: DCA clampmeter only ＊ Back Light function ＊ KEY function ＊ Data Hold & RS232 output function ＊ Range change function Band-gap reference voltage output Semi-auto calibration operation (Taiwan patent no.: 367334) V oltage overflow selection ( DC / AC : 1010V , DC / AC : 610V) LCD segment check when power on Auto power off ( 30min / 15min ) Sleep state indicative signal output Re-power on On-chip buzzer driver Low battery detection Description ES252 is an integrated analog -to-digital converter with 2,000-count LCD, automatic range selection, and 3V DC power supply. Automatic range selection is provided for ACV/DCV measurement, resistance measurement, current measurement, capacitance measurement, and frequency counter. Expensive and bulky mechanical range switches are not required. Other features include relative value display, offset rem oving feature for DCA clamp mode , data holding, maximum and minimum value holding, 3 -phase AC volt age phase-rotation detection , diode measurement, temperature measurement, continuity checking, low battery detection, auto power off, re -power on, backlight driver, buzzer driver and RS232 data output.
V 1.5 2 2016/04/27 ES252
2000 Counts DMM
Digital multimeter Clamp meter Pin Assignment 100L LQFP package V R217 ADP1 TEMP i n2 CI NT3 CAZ4 RAZ5 V RH6 DACO7 VR _ADP8 V R_ CL AMP9 OHMC310 OHMC211 OHMC112 O R113 V R514 V R415 V R316 OVSG18 V R119 mV in20 AC VL21 AC VH22 ADI23 ADO24 TEST525 FRE Q37 DI S_RS 23238 CLAMP39 A SE L43 T SY MB44 TS EL45 DIOV46 BP447 BKOUT35 ALARM34 CESEL33 BP348 BP249 SEG14 55SEG13 56 SGND26 OVX27 SEG12 57SEG11 58SEG10 59SEG09 60SEG08 61SEG07 62SEG06 63 SEG15 54 SEG17 52SEG16 53 CA-29 CA+30 R10K31 R1K32 DI S_200M36 SEG05 64SEG04 65SEG03 66SEG02 67SEG01 68MAXMIN 69REL 70HZ 71KEY 72HOLD 73RANGE 74CALEN 75 O SC2 76O SC1 77 IVS 100 SLEEP 78RS OUT 79BZOUT 80FC5 81FC4 82FC3 83FC2 84FC1 85SLACDC 86C+ 87C- 88SCL 89SDA 90L BA T 91V- 92V- 93COFFN 94COFFP 95V+ 96DGND 97AGND 98AGND 99 OVH28 DISDGB40 BKLIT41 AP OSEL42 BP150 SEG18 51 ES252
V 1.5 3 2016/04/27 ES252 Pin No Symbol Type Description 1 ADP I Measurement input in ADP mode. 2 TEMPin I Measurement input in Temperature mode. 3 CINT O High-resolution integrator output. Connect to integral cap acitor. (Metalized Polypropylene Film Capacitor type is recommended) 4 CAZ O High-resolution auto-zero capacitor connection. 5 RAZ O Buffer output pin in AZ and ZI phase. 6 VRH O Output of band-gap voltage reference. Typically –1.23V . 7 DACO O Output of band-gap voltage reference. Typically –400 m V . 8 VR_ADP I Reference input voltage connection. Typically –400 mV . 9 VR_CLAMP I Reference input voltage connection. Typically –400mV . 10 OHMC3 O Filter capacitor connection for resistance mode. 11 OHMC2 O Filter capacitor connection for resistance mode. 12 OHMC1 O Filter capacitor connection for resistance mode. 13 OR1 O Reference resistor connection for 20.00/200.0Ω range
14 VR5 O V oltage measurement ÷10000 attenuator(1000V)
15 VR4 O V oltage measurement ÷1000 attenuator(200.0V) 16 VR3 O V oltage measurement ÷100 attenuator(20.00V) 17 VR2 O V oltage measurement ÷10 attenuator(2.000V)
18 OVSG O Sense low voltage for resistance/voltage measurement
19 VR1 I Measurement Input. Connect to an accurate 10MΩ resistor. 20 mVin I Measurement input in 200.0mV mode.
21 ACVL I
Rectified signal low input in ACV/ACA mode. Connect to negative output of external AC to DC converter.
22 ACVH I
Rectified signal high input in ACV/ACA mode. Connect to positive output of external AC to DC converter. 23 ADI I Negative input of internal AC to DC OP Amp. 24 ADO O Output of internal AC to DC OP Amp. 25 TEST5 O Buffer output of OVSG . 26 SGND I Signal Ground input. 27 OVX I Sense input for resistance / capacitance measurement. 28 OVH O Output connection for resistance measurement. 29 CAN I / O Negative auto-zero capacitor connection for capacitor measurement. 30 CAP I / O Positive auto-zero capacitor connection for capacitor measurement. 31 R10K O Connect to a precised 10KΩ resister for capacitor measurement. 32 R1K O Connect to a precised 1KΩ resister for capacitor measurement. 33 CESEL I V oltage OL selection feature control pin. (1010V/610V) 34 ALARM O HV signal detection in V oltage mode and EF mode indication output. 35 BKOUT O If BKLIT function is enabled, this pin will change from V - to V+ . Once press BKLIT pin again within 300 sec, this pin will change back to V-. 36 DIS_200M I Pulled to V- to disable the 200M ohm range at R measurement mode.
V 1.5 4 2016/04/27 ES252 Pin Description ( Continued ) Pin No Symbol Type Description 37 FREQ I Frequency counter input, offset V-/2 internally by the chip. 38 DIS_RS232 I Assert low (V-) to make serial data output function NOT available.
39 CLAMP I
In µA or mA modes, it is used to control the ‘µ’ or ‘m’ sign. Set to V- to enable clamp current mode and set initial voltage range to 200V. 40 DISDGB I Control warning buzzer output at HV mode. Pulled to low is not available.
41 BKLIT I
Pulled to low to make b ack light function enabled. Push KEY larger than 2 sec. to enable BKOUT pin. 42 APOSEL I Idle time selection for auto power off feature.
43 ASEL I
Current mode OL indication for 2000A (CLAMP = V -) or 20A (CLAMP = Floating) ranges
44 TSYMB I
Pulled to V - to disable input terminal symbol displayed on the LCD panel selection pin. 45 TSEL I Pulled to V- to enable auto range for TEMP mode. 46 DIOV I Pulled to V- to select the open voltage of diode mode to 2.8V . 47 BP4 O LCD backplane 4. 48 BP3 O LCD backplane 3. 49 BP2 O LCD backplane 2. 50 BP1 O LCD backplane 1. 51 - 68 SEG18 - SEG01 O LCD segment line 01 – 18. 69 MMX I Pulse to V- to enable MAX/MIN function. 70 REL I Pulse to V- to enable/disable Relative function or Zero function. 71 HZ I Pulse to V- to enable V AHZ mode. 72 KEY I Pulse to V- to change mode.
73 HOLD I
Pulse to V - to enable HOLD function. Pulse to V - larger than one second to enable RS232 output. When RS232 output is enabled, t he APO will be disabled automatically. 74 RANGE I Pulse to V- to enable manual mode and manual range selection. 75 CALEN I Pulled to V- to enable the calibration scheme. 76-77 OSC1-2 - Connect to 4MHz crystal oscillator 78 SLEEP O Sleep mode indicator, asserts low in SLEEP mode. 79 RSOUT O Serial data output.
80 BZOUT O Outputs a 2KHz audio frequency signal for driving piezoelectric buzzer
81 FC5 I Switch 5 for function selection. 82 FC4 I Switch 4 for function selection. 83 FC3 I Switch 3 for function selection. 84 FC2 I Switch 2 for function selection. 85 FC1 I Switch 1 for function selection. 86 SLACDC I Select initial DC/AC state.
V 1.5 5 2016/04/27 ES252 Pin Description ( Continued ) Pin No Symbol Type Description 87 CN O Negative capacitor connection for on-chip DC-DC converter. 88 CP O Positive capacitor connection for on-chip DC-DC converter. 89 SCLP O Output to EEPROM 24LC02 clock. 90 SDAP I / O Input / Output from to EEPROM 24LC02 data. Open drain output. 91 LB AT I Multi-level low battery configuration input. Simple external resistor divider is required. 92 V- P Negative supply voltage. 93 V- P Negative supply voltage.
94 COFFN O Offset canceled capacitor negative terminal for temperature mode
95 COFFP O Offset canceled capacitor positive terminal for temperature mode
96 V+ O Output of on-chip DC-DC converter. 97 DGND P / G Digital ground. 98 AGND P / G Analog ground. 99 AGND P / G Analog ground. 100 IVS I Measurement input in uA/mA current mode.
V 1.5 6 2016/04/27 ES252 Supply V oltage (V- to AGND) -4V Analog Input V oltage V- -0.6 to V+ +0.6 V+ V+ ≥ (AGND/DGND+0.5V) AGND/DGND AGND/DGND ≥ (V- -0.5V) Digital Input V- -0.6 to DGND +0.6 Power Dissipation. Flat Package 500mW Operating Temperature -20℃ to 70℃ Storage Temperature -45℃ to 125℃
Electrical Characteristics
Ta = 18~28 oC Parameter Symbol Test Condition Min. Typ. Max Units Power supply V- 2.4 -3.0 3.3 V Operating supply current In DCV mode IDD Normal operation — 1.8 2.5 mA ISS In sleep mode — — 10 µA V oltage roll-over error REV 10MΩ input resistor — — ±0.1 %F.S1 V oltage nonlinearity NLV Best case straight line CINT=MPR capacitor — — ±0.1 %F.S1 Zero input reading 10MΩ input resistor (V-=-3V) -000 000 +000 counts Band-gap reference voltage VREF 100KΩ resistor between VRH & AGND -1.30 -1.23 -1.16 V Open circuit voltage for 600Ω measurement V-=3V — -3.0 — V Open circuit voltage for other Ω measurement -1.19 -1.08 -0.97 V Peak to peak backplane Internal pull -high to 0V current Between V- pin and HOLD, RANGE, KEY , FC1-FC5, BKLIT, — 1.2 — µA Between V- pin and DIS_RS232 pin — 11 — µA AC/DC scan mode sensitivity ACV selected — 300 — mVrms AC frequency response at 2.000V range ±1% — 40-400 — HZ ±5% (No compensated) — 400-2000 — Multi-level low battery detector Vt1 LB AT 9 vs. V- — 2.15 — V Vt2 — 1.82 — Reference voltage temperature coefficient TCRF -20℃<TA<70℃ — 100 — ppm/℃ Capacitance measurement accuracy 6nF–600uF (Residual value is not included) -1.0 — 1.0 % -3 — 3 counts Capacitance measurement accuracy 6mF/60mF -3.0 — 3.0 % -3 — 3 counts Note: 1. 2000 counts Full Scale.
V 1.5 7 2016/04/27 ES252
- Operating Modes 1.1. Semi-auto calibration scheme ES252 includes DMM & C lamp-on meter features in single chip. DMM manufacturers need the calibration process in production. The traditional solution needs the variable resistors for calibration by manual adjustment. ES252 provide another calibration scheme and the most variable resistors could be ignored. When ES252 is at OFF -state, pull CALEN (pin 75) to V- to active the calibration scheme after re- power on. A digital controlled voltage output will be act ive from DACO. When semi-auto calibration scheme is active, use HOLD (or REL) key to decrease voltage and use RANGE (or MMX) key to increase the voltage. Decrease the reference voltage means the counts on display will be increased. Increase the reference v oltage means the counts on display will be decreased. The adjustment step is approximate one count. If coarse adjustment is required, push HOLD (or REL) and RANGE (or MMX) larger than one second to speed up to approximate 10 counts per second. After calibr ation process is finished, push HOLD (or REL) and RANGE (or MMX) simultaneously less than 1 second to save the digital control led code to external EEPROM (24LC02). The semi-auto calibration scheme supports the following eleven measurement modes. When CALEN pin is active, set the proper function switches or push KEY to choose the target measurement mode. When mode is selected, the LCD segment of Unit at related measurement will be blinking.
V 1.5 8 2016/04/27 ES252 Mode Default Range For CAL Remark V oltage Measurement 2.000V (DC/AC separated) Accuracy of other ranges is guaranteed by external resistor network. mV V oltage Measurement 200.0mV (DC/AC separated) DC Current Measurement For Multi-meter (uA/mA) N/A The same configuration for DCV mode. AC Current Measurement For Multi-meter (uA/mA) AC 200.0uA / AC 20.00mA Select lower range for calibration in AC mode. Higher range calibration use the same as ACV mode. DC Current Measurement For Multi-meter (A) 2A or 20A Auto 2 ranges choose one, p roposed to use a large range to calibration. AC Current Measurement For Multi-meter (A) 2A or 20A Auto 2 range s individual for calibration is necessary. DC Current Measurement for (Clamp-meter application) 20A or 200A (one of both modes chosen for calibration) Auto 2 ranges choose one, proposed to use a large range to calibration. AC Current Measurement for higher range (Clamp-meter) 999.9A or 2000A (one of both modes chosen for calibration) Auto 2 ranges separated for calibration is necessary. AC Current Measurement for lower range (Clamp-meter) 20.00A or 200.0A (one of both modes chosen for calibration) Current measurement for Clamp-meter application 2A/20A/200A/2000A (DC/AC separated) Manual 4 ranges separated for calibration is necessary Capacitor Measurement 20.00nF/20.00uF 2 ranges separated for calibration Temperature Measurement 200.0℃ Lower range in auto temperature measurement. ADP Measurement 2000 / 200.0 / 20.00 / 2.000 4 ranges separated for calibration. After calibration procedure is finished, set ES252 to OFF-state and set CALEN (pin75) to DGND or kept floating to return to normal mode operation after re-power on.
V 1.5 9 2016/04/27 ES252 1.2. Voltage Measurement A re-configurable voltage divider automatically provides a suitable range in voltage measurement mode. 200.0mV range is independent and manual mode. It takes input signal from mVin (pin20). The following table summarizes the Full-Scale ranges in each configuration. Configuration Full Scale Range Divider Ratio Resister Connection Input Pin CAL VR1 200.0mV 1 - mVin V.S. SGND Yes VR2 2.000V 1/10 VR2 (1.111MΩ) VR1 V.S. SGND Yes VR3 20.00V 1/100 VR3 (101KΩ) VR1 V.S. SGND N/A VR4 200.0V 1/1000 VR4 (10.01KΩ) VR1 V.S. SGND N/A VR5 1000V 1/10000 VR5 (1KΩ) VR1 V.S. SGND N/A Note: The CLAMP pin is used to control the voltage start range from 2.000V or 200.0V. Set to V- to select the initial range at 200.0V and set to floating state to select the initial range at 2.000V. The ES252 support the hazardous live voltage warning. When the voltage measured exceeds the level defined, the buzzer generates 2KHz beep and ALARM (pin 34) drive high output (V+ level) periodically. It can remind the user to notice the hazardous voltage. The buzzer sound warning could be cancelled by DISDGB (pin40). 1.2.1. OL Selection ES252 has a voltage OL selection feature archived by configuring the pin CESEL (pin33). In automatic voltage mode, ES252 will show OL when the voltage exceeds the defaulted level. If CESEL is connected to V-, ES252 will have a 1010V overflow level in voltage mode. If CESEL connected to DGND , the overflow leve l will be set to 610V in DCV and ACV mode. The configuration of CESEL is listed below. When CESEL is kept floating, ACV OL level is set to 760V . For ACV/DCV voltage modes: CESEL V- DGND Floating DCV 1010V 610V 1010V ACV 1010V 610V 760V
V 1.5 10 2016/04/27 ES252 1.3. Current Measurement For Multi-meter ES252 has 3 automatic current measurement modes for multi -meter. The following table summarizes the f ull-scale range of each mode. When ES252 operates in the current measurement modes for multi -meter, it takes high input from pin IVS, low input from pin SGND and reference voltage from calibration scheme. Mode FC1~4 Full Scale Input Terminal CAL Automatic1 1,1,0,1 200.0µA / 2000µA IVS V .S. SGND AC 200uA3 Automatic2 1,1,1,1 20.00mA / 200.0mA IVS V .S. SGND AC 20mA3 Automatic3 0,0,0,0 2.000A /20.00A2 IVS V .S. SGND Yes Note: 1. Connect Clamp (pion39) to V- will disable the “µ2” / ”m2” symbol on LCD panel. 2. Connect ASEL (pin43) to V- will set maximum readings of input for Automatic3 mode to 10.00A. 3. DCuA/DCmA use the same configuration as DCV mode. AC higher range use the same configuration as ACV mode. 1.4. Current Measurement For Clamp-meter ES252 has 2 automatic and 4 manual current measurement modes for Clampmeter. The following table summarizes the Full -Scale range of each mode. W hen ES252 operate in the automatic mode s and the manual mode1~4, it takes high input from IVS pin, low input from SGND and reference voltage from VR_CLAMP. Mode FC1~4 1CLAMP Range Max full scale Input Terminal CAL Automatic1 1,1,0,1 0 200.0A / 2000A2 20/200 mV IVS V .S. SGND Yes4 Automatic2 1,1,1,1 0 20.00A / 999.9A 20/1000 mV IVS V .S. SGND Yes4 Manual1 1,1,0,0 X 2.000A 600 mV IVS V .S. SGND Yes Manual2 1,0,0,0 X 20.00A 600 mV IVS V .S. SGND Yes Manual3 1,0,1,0 X 200.0A 600 mV IVS V .S. SGND Yes Manual4 1,0,0,1 X 1000A or 2000A2 100 or 200 mV IVS V .S. SGND Yes Note: 1. Connect CLAMP to V- will disable the “µ2” / ”m2” symbol on LCD panel. 2. Connect ASEL to V- will set maximum of input for Automatic1 & Manual4 modes to 1000A. 3. In DC current modes for clamp-meter, ES252 provides Zero Function (pin70) for offset removing. 4. AC Lower range calibration use the same configuration as Manual3 ACA mode. AC Higher range calibration use the same configuration as Manual4 ACA mode.
V 1.5 11 2016/04/27 ES252 1.5. Resistance Measurement A re -configurable divider automatically provides a suitable Full-Scale range in resistance measurement mode. The following table summarizes the f ull-scale ranges and the reference r esistors in each configuration. Configuration Full Scale Range Relative Resistor Equivalent value OR0 20.00Ω OR1 100Ω OR1 200.0Ω OR1 100Ω OR2 2.000KΩ VR5 1KΩ OR3 20.00KΩ VR4 || VR1 10KΩ OR4 200.0KΩ VR3 || VR1 100KΩ OR5 2.000MΩ VR2 || VR1 1MΩ OR6 20.00MΩ VR1 10MΩ OR7* 200.0MΩ VR1 10MΩ Note: If pin36 (DIS_200M) is pulled to V-, the 200MΩ range will be disabled. 1.6. Capacitance Measurement The following table summarizes the eight ranges of capacitance measurement mode. Configuration1 Full Scale Range Relative Resistor Measurement Period C13 2.000nF Ratio to C2 0.33 sec C22 20.00nF CAL 0.33 sec C3 200.0nF Ratio to C2 1.15 sec C4 2.000uF Ratio to C2 1.15 sec C5 20.00uF CAL 0.26 sec C6 200.0uF Ratio to C5 2.6 sec(max) C7 2.000mF Internal matching 2.6 sec(max) C8 20.00mF Internal matching 26 sec(max) Note: 1. In order to obtain an accurate reading, a capaci tor must be discharged before measurement begins. The chip has a built-in discharge mode to automatically discharge the capacitor. In discharge mode, the main -display shows dIS.C. Discharging through the chip is quite slow. We recommend users to discharge the capacitor with some other apparatus. 2. The C2 range is calibrated in calibration scheme. 3. The C1 range residual offset could be compensated by the small capacitors near to OVH pin.
V 1.5 12 2016/04/27 ES252 1.7. Continuity Check Continuity check shares the same configuration w ith 200.0Ω manual resistance measurement mode and has buzzer output to indicate continuity. The buzzer generates 2KHz beep and ALARM (pin 34) drive high output (V+ level) whenever the reading is less than 30Ω. The ES252 built in a high-speed short detection circuit and the detection could be less than 10ms. 1.8. Diode Measurement Diode measurement mode shares the same configuration with 2.000V manual voltage measurement mode and has buzzer output to indicate continuity. The buzzer generates a 2KHz sound and A LARM (pin 34) drive high output (V+ level) whenever the reading is less than 30mV . If the test circuit is open or the voltage drop between the two ports of the diode under test is larger than 2V or 2.8 V (depends on DIOV pin level), the LCD panel will show “OL”. DIOV DGND/Floating V- OL 2.000V 2.80V The ES252 also support a LED forward voltage measurement mode. It is necessary to use external source to achieve the measurement. The following table & diagram summarizes the diode & LED measurement mode. Mode SLACDC FC1~5 Full Scale Input Terminal LED 1 0,1,1,0,0 3.50V VR1 V .S. SGND
V 1.5 13 2016/04/27 ES252 1.9. Frequency Counter The time base of the frequency counter is derived from an external crystal oscillator by Tcounter = 4,000,000 Fosc Where Fosc is the frequency of the crystal oscillator. Thus, the counter has a 1- second time base when a 4MHz oscillator is used. The frequency counter can select the proper range automatically or manually. Auto-range operation extends over six decades, from 200.0Hz to 20.00MHz. The following table summarizes the Full-Scale range of the frequency counter. Range Full Scale FR1 200.0Hz FR2 2.000KHz FR3 20.00KHz FR4 200.0KHz FR5 2.000MHz FR6 20.00MHz *If input frequency is less than 1.0Hz, ES252 will show 0.0Hz 1.10. Electrical field detection mode ES252 supports a non- contact AC voltage measurement, which is called electric field measurement also. The ADC input is configured from ADP pin vs. SGND. When no or less electric field is detected, the LCD display shows “EF”. If the electric field is detected, the strength will be showed on the LCD display by “-“ not digits type. Level 1(equivalent to 12.5% full scale of ADC) is “ -“ and the level 4(equivalent to 100% full scale of ADC) is “ ----“. Additional beeper (BUZOUT pin) and LED alarm (ALARM pin) will be active from ES252. The frequency of buzzer and LED alarm depends on the strength of electric field also. The f aster beeper means the stronger electric field (AC voltage) is sensed. Mode FC1~4 SLACDC Input Terminal EF 1,1,1,0 1 ADP V .S. SGND ADP 100M EF test circuit EFin+ SGND AGND EFin- 100k VRADP -400mV
V 1.5 14 2016/04/27 ES252 1.11. Temperature Measurement mode Temperature measurement mode takes input signal from TEMPin (pin2). The ES252 has ºC to ºF scale translation circuit and standard K-type thermocouple reference table is built-in. External cold-junction compensa tion circuit is still necessary. In temperature measurement mode, there is automatic mode and manual mode . The TSEL pin (pin45) is used to control the automatic mode (0.1OC/1OC resolution) or manual mode (0.1OC resolution) selection. TSYMB (pin 44) could enable or disable display of input terminal symbol on the LCD panel (SEG18). Manual range Auto Range ºC range -200.0 ºC ~ 200.0 ºC -200.0 ºC ~ 200.0 ºC / 1350 ºC ºF range -328.0 ºF ~ 392.0 ºF -328.0 ºF ~ 392.0 ºF / 2462 ºF 1.12. ADP ES252 provides 4 man ual range ADP measurement modes for user define. The ADP pin is auxiliary input terminal for ADC of ES252. The full scale for ADP mode is 200.0mV. If FC5=0, the minus sign will not be shown on LCD segment. Mode FC1~4 SLACDC Full Scale Input Terminal CAL ADP0 0,0,1,1 1 2000 ADP V .S. SGND Yes ADP1 0,0,0,1 1 200.0 ADP V .S. SGND Yes ADP2 0,1,1,1 1 20.00 ADP V .S. SGND Yes ADP3 0,0,1,0 1 2.000 ADP V .S. SGND Yes Note: If FC5 is set to V-, the minus sign will be disabled.
V 1.5 15 2016/04/27 ES252 1.13. Auto Power Off And Idle Time Selection ES252 has a default auto power off function. If the meter is idle for more than the given idle time duration, the chip automatically turns the power off. The idle time to trigger the auto power off function is determined by APOSEL (pin 42). If APOSEL is connected to V-, the idle time will be set to 30 minutes. If pin APOSEL is floating, the i dle Time will be set to 15 minutes. When APO is occurred, the state of the meter is reserved. The APO symbol on the LCD panel indicates whether the auto power off is enabled or not. In some cases, user might want to disable Auto power off. There are two ways to disable this feature as following: 1. Power on the meter when any of the push functions, except for HOLD, is pressed down. 2. In addition, when RS232 output is active, the auto power off function is also disabled automatically. Note: Powering on the meter while pressing HOLD and lasts 2 seconds turns on all LCD segments until HOLD is pressed again. 1.14. Sleep The meter enters sleep mode after auto power off. The SLEEP (pin 78) asserts low (V-) in the sleep mode, and asserts high (V+, not 0V) after re-power on. 1.15. Re-Power On After auto power-off, pushing any of the push function or changing the rotary mode can turn on the meter again. If the meter is re-powered on by changing the rotary mode, the saved state is cleared. If the meter is re -powered on by push functions, the chip restores the saved state and enters HOLD mode. The LCD displays the saved value.
V 1.5 16 2016/04/27 ES252 1.16. Hazardous Voltage Indication The ES252 could provide the AC/DC hazardous voltage indication for voltage/resistor/capacitor/diode/frequency modes. Of course, the indication could support LCD symbol /LED /Buzzer driving simultaneously. Especially ES252 could detect the AC voltage in DCV mode and detects the DC voltage in ACV mode. It means if not proper AC or DC voltage signal exists on the DUT when DCV or ACV measurement mode is set, the HV indication will be active. HV indication criterion Function / Range Input DC voltage (typ.) Input AC voltage (typ.) AC mV > +3V OL AC 2V > +20V OL AC 20V – 1000V > +100V > 30V DC mV OL > 3Vrms (40-1kHz) DC 2V OL > 20Vrms (40-1kHz) DC 20V-1000V > 30V or < -30V > 90Vrms (40-1kHz) Frequency modes > 70V or < -70V > 40Vrms (40-1kHz) Res/Cap/Diode modes > 10V or < -10V > 10Vrms (40-1kHz) Note: If AC+DC signal is applied, the voltage criterion will be changed.
V 1.5 17 2016/04/27 ES252 1.17. Multi-level Low Battery Voltage Detection ES252 provides a voltage detection input (pin 91: LBAT) for multi- level low battery ap plication. There are two internal voltage reference Vt1 & Vt2 for comparing with LBAT . If LBAT is larger than Vt1, the LCD segment of SLB 1 – SLB3 will active always. This status implies Full battery. When LBAT is less than Vt1 but larger than Vt2, the LCD segment of SLB 1 will disappear and this status implies Half battery. When LBAT is less than Vt2, the LCD segment of SLB2 will disappear and this status implies l ow battery. When the Low battery status lasts for 10 seconds, the LCD segment of SLB3 will be b linking. When the SLB 3 is blinking for ~ 20 seconds, the operation of meter will be inhibited and LCD panel will show “ Lo.bt” symbol. In this case, it is suggested to replace a new battery immediately. After “Lo.bt” appears and lasts for around 80 seconds, ES252 will enter to auto power off mode instantly. L o.b t Low battery condition > 30s Operation not allowed DC 1.8 0 0 V Low battery DC AUTO AUTO 1.8 0 0 V Half battery DC AUTO 1.8 0 0 V Full battery DC AUTO blinking L o.b t Low battery condition > 30s Operation not allowed DC 1.8 0 0 V Low battery DC AUTO AUTO 1.8 0 0 V Half battery DC AUTO 1.8 0 0 V Full battery DC AUTO L o.b t Low battery condition > 30s Operation not allowed DC 1.8 0 0 V Low battery DC AUTO AUTO 1.8 0 0 V Half battery DC AUTO 1.8 0 0 V Full battery DC AUTO blinking Low battery test circuit (a) 120K 470K BA TTE LBAT9 AGND 0.1u Low battery test circuit (b) 910K 300K BA TTE LBAT9 AGND 0.1u
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- Measurement Mode Switching Measurement mode depends on the logic level of SLACDC, FC1, FC2, FC3, FC4, FC5 and KEY selection. When FC5 is high, the measurement mode list is shown below: SLACDC FC1 FC2 FC3 FC4 Mode KEY selection 0 1 0 1 1 DC V oltage Measurement DCV ↔ ACV 0 1 1 0 1 Auto DC Current Measurement(µA) DCA ↔ ACA 0 1 1 1 1 Auto DC Current Measurement(mA) DCA ↔ ACA 0 0 0 0 0 Auto DC Current Measurement(A) DCA ↔ ACA 0 1 1 1 0 Resistance Measurement Ω Continuity Diode Cap 0 1 1 0 0 3Manual DC 2.000A DCA ↔ ACA 0 1 0 0 0 3Manual DC 20.00A DCA ↔ ACA 0 1 0 1 0 3Manual DC 200.0A DCA ↔ ACA 0 1 0 0 1 3Manual DC 2000A DCA ↔ ACA 0 0 0 1 1 Resistance Measurement Ω ↔ Continuity 0 0 0 0 1 Continuity Check Continuity ↔ Diode 0 0 1 1 1 Resistance Measurement Ω Continuity Diode 0 0 0 1 0 Frequency Measurement ---- 0 0 1 1 0 Capacitance Measurement ---- 0 0 1 0 0 Auto Temperature Measurement ℃ ↔ ℉ 0 0 1 0 1 DCmV DCmV ↔ ACmV 1 1 0 1 1 AC V oltage Measurement ACV ↔ DCV 1 1 1 0 1 Auto AC Current Measurement(µA) ACA ↔ DCA 1 1 1 1 1 Auto AC Current Measurement(mA) ACA ↔ DCA 1 0 0 0 0 Auto AC Current Measurement(A) ACA ↔ DCA 1 1 1 1 0 EF mode ---- 1 1 1 0 0 3Manual AC 2.000A ACA ↔ DCA 1 1 0 0 0 3Manual AC 20.00A ACA ↔ DCA 1 1 0 1 0 3Manual AC 200.0A ACA ↔ DCA 1 1 0 0 1 3Manual AC 2000A ACA ↔ DCA 1 0 0 1 1 ADP0 ( 2000 ) ---- 1 0 0 0 1 1 0 1 1 1 1 0 0 1 0 1 0 1 1 0 Scan ACV/DCV SCAN DCV ACV SCAN 1 0 1 0 0 Auto Temperature Measurement ℉↔℃ 1 0 1 0 1 ACmV ACmV ↔ DCmV Note: 1. When FC5 is high, the ADP0, ADP1, ADP2 and ADP3 modes can display minus sign. 2. These modes could be designed for multimeter current modes, please refer to section 1.3. 3. These modes could be designed for clampmeter current modes, please refer to section 1.4.
V 1.5 19 2016/04/27 ES252 Measurement Mode Switching (Continued) Measurement mode depends on the logic level of SLACDC, FC1, FC2, FC3, FC4, FC5 and KEY selection. When FC5 is low, the KEY function is disabled in most modes. The measurement mode list is shown below: SLACDC FC1 FC2 FC3 FC4 Mode KEY selection & Remaks 0 1 0 1 1 DC V oltage Measurement ---- 0 1 1 0 1 Auto DC Current Measurement(µA) ---- 0 1 1 1 1 Auto DC Current Measurement(mA) ---- 0 0 0 0 0 Auto DC Current Measurement(A) ---- 0 1 1 1 0 Diode Measurement ---- 0 1 1 0 0 3Manual DC 2.000A ---- 0 1 0 0 0 3Manual DC 20.00A ---- 0 1 0 1 0 3Manual DC 200.0A ---- 0 1 0 0 1 3Manual DC 2000A ---- 0 0 0 1 1 Resistance Measurement ---- 0 0 0 0 1 Continuity Check ---- 0 0 1 1 1 Resistance Measurement ---- 0 0 0 1 0 Frequency Measurement ---- 0 0 1 1 0 Capacitance Measurement ---- 0 0 1 0 0 Auto Temperature Measurement ℃ 0 0 1 0 1 DCmV ---- 1 1 0 1 1 AC V oltage Measurement ---- 1 1 1 0 1 Auto AC Current Measurement(µA) ---- 1 1 1 1 1 Auto AC Current Measurement(mA) ---- 1 0 0 0 0 Auto AC Current Measurement(A) ---- 1 1 1 1 0 EF mode ---- 1 1 1 0 0 3Manual AC 2.000A ---- 1 1 0 0 0 3Manual AC 20.00A ---- 1 1 0 1 0 3Manual AC 200.0A ---- 1 1 0 0 1 3Manual AC 2000A ---- 1 0 0 1 1 ADP0 ( 2000 ) ---- 1 0 0 0 1 1 0 1 1 1 1 0 0 1 0 1 0 1 1 0 LED ---- 1 0 1 0 0 Auto Temperature Measurement ℉ 1 0 1 0 1 ACmV ---- Note: 1. When FC5 is low, the ADP0, ADP1, ADP2 and ADP3 modes can’t display minus sign. 2. These modes could be designed for multi-meter current modes, please refer to section 1.3. 3. These modes could be designed for clamp-meter current modes, please refer to section 1.4.
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- Push Function All the enabled push functions will be reset when the measurement mode is changed when FC1-FC5 modes are changed . The following table lists the available function versus every measurement mode. Note: 1Include automatic μA, automatic mA and manual A modes, please refer to section 1.3. 2Include 2 automatic modes and 4 manual modes, please refer to section 1.4. 3When clamp-meter DCA mode is selected, the REL function will be changed to ZERO function operation automatically. 4Only auto range mode is available. 5When BKLIT (pin41) is pulled to V-, push KEY and last for 2 seconds will active the back light output driver (BKOUT). 6When DIS_ RS232 (pin38) is kept floating, push HOLD key and last for 2 seconds will active RS232 output mode (RSOUT). 7When ACV measurement mode is in operation to push Hz key for 2 seconds will active 3-phase rotation detection. HZ MMX REL KEY/BKLIT5 HOLD/RS2326 RANGE Voltage mode AC7 O O O O O mV mode AC O O O O X 1Current Mode for Multimeter AC O O O O O 2Current Mode for Clampmeter AC O O3 O O O4 Resistance X O O O O O Continuity X O O O O X Diode mode X O O O O X Frequency X X X O O O Capacitance X O O O O O Temperature X O O O O O4 EF Mode X X X O O X ADP mode X O O O O X
V 1.5 21 2016/04/27 ES252 3.1. Range Push RANGE 1 key to switch from automatic to manual mode, and while in manual mode, changes the full-scale range. The following figure shows the state transition. Automatic Mode Manual Mode 1 push < 1 sec 1 push > 1 sec 1 push < 1 sec Range up Measurement Mode Auto Manual Control Range Initial Range V VR2 – VR5 VRi → VRi + 1, VR5 → VR2 2.000V – 1000V 2.000V2 Auto µA R1 – R2 R1 → R2, R2 → R1 200.0µA – 2000µA 200.0µA Auto mA R1－R2 R1 → R2 R2 → R1 20.00mA – 200.0mA 20.00mA Auto A R1－R2 R1 → R2 R2 → R1 2.000A – 20.00A 2.000A Auto 20A/1000A (clamp) R1－R2 R1 → R2 R2 → R1 20.00A – 999.9A 20.00A Auto 200A/2000A (clamp) R1－R2 R1 → R2 R2 → R1 200.0A – 2000A 200.0A Capacitance C1 – C8 Ci → Ci + 1, C8 → C1 2.000nF– 20.00mF 2.000nF Capacitance (Clamp) C1 – C8 Ci → Ci + 1, C8 → C1 2.000nF– 20.00mF 2.000nF Ω OR0 – OR7 ORi → ORi + 1, OR7 → OR0 20.00Ω – 200.0MΩ 20.00Ω Temp T1-T2 T1T2 T2T1 200.0oC~1350oC 200.0oC Frequency FR1 – FR6 FRi → FRi + 1 FR6 → FR1 200.0Hz – 20.00MHz 200.0Hz Note: 1. Pushing RANGE resets all existing special modes except for V AHZ mode. 2. Initial range of voltage mode depends on Clamp pin configuration. Pulled to V- to set to 200.0V as initial range.
V 1.5 22 2016/04/27 ES252 (Auto/Manual) 〝REL〞active. The relative value 〝REL〞and〝H〞active. Hold the relative value push HOLD push REL push REL push HOLD 3.2. HOLD and RS232 output Feature HOLD mode makes the meter stop updating the LCD panel. This mode can be nested in most of the special modes. Enabling HO LD function in automatic mode makes the meter switch to manual mode, but the Full-Scale range remains the same. ES252 provides a RS232 output feature. To activate RS232 output feature, press down the HOLD key and last for 2 seconds. The meter will enable UART port output from RSOUT. (Please see section 4.) 3.3. KEY See Section “Measurement Mode Switching” for the function of this pin. 3.4. REL + HOLD In REL mode, the LCD panel displays DN+K - DN, where N = 1, 2, 3, … , D N is the last value before REL key is pushed, and DN+K is the current value. The meter returns to normal operation if REL is pressed again. Pressing HOLD in REL mode makes the meter stop updating the LCD panel. Note: 1. It’s possible that relative value (DN+K - DN) exceeds 2,000 or -2,000 counts. The LCD shows OL in REL mode only if DN or DN+K is more than 2,000 counts.
V 1.5 23 2016/04/27 ES252 3.5. Max/Min + HOLD The meter displays the maximum or minimum value of the input in Max/Min mode. When MMX key is pressed for the first time, the meter displays the maximum v alue. The meter displays the minimum value, when it is pressed again. When MMX key is pressed for the third time, the meter displays current value. The meter returns to normal operation if MMX is pressed and held for longer than one second. Pressing HOLD in Max/Min mode makes the meter stop updating the maximum or the minimum value. Original state (Automatic/manual) “MAX” active max value “MIN” active min value hold max value. hold min value. Push HOLD Push HOLD 1 push<1 sec 1 push<1 sec 1 push>1 sec 1 push>1 sec 1 push<1 sec
V 1.5 24 2016/04/27 ES252 3.6. ZERO Function 999.9A/2000A (please refer to section 1.4) mesurement modes, ES252 provides ZERO function to remove the residual current value. Push REL key less than one second to enter ZERO mode. In ZERO mode, the LCD panel displays D N+K - DN, where N = 1, 2, 3, … , D N is the last conversion value before REL key is pushed, and D N+K is the current conversion value. If REL key is pushed again in ZERO mode, the meter will refresh the D N value and displays the D N+K - DN again. The meter returns to normal operation if REL key is pressed and held for longer than one second. Pressing HOLD in ZERO mode makes the meter stop updating the LCD panel. In 2- range auto DCA modes for clampmeter ( 200.0A/2000A or 20.00 A/999.9A), the system will stay in automatic mode, even if the ZERO function is activated. In other words, It could achieve real automatic operation. In automatic mode, ZERO function could not be entered from higher range, but it could be still activated if current range is lower one. This is because most residual current value is so small that the range could not be higher one in autom atic mode. When enter ZERO mode from lower range, the system will store the nonzero counts (residual current value). If the range goes up to higher one automatically, the nonzero counts will be divided by ten. So this function will still work well in automatic modes. State diagram for ZERO mode : State diagram for ZERO + HOLD mode : Original State ‘Zero’ Active Show DN+K - DN Press Zero > 1s Press Zero Press Zero < 1s Original State Show DN+K - DN Press Zero > 1s Press Zero Press Zero < 1s ‘Hold’ Active Stop LCD upgrading Press Hold
V 1.5 25 2016/04/27 ES252 State diagram for ZERO + Max/Min + HOLD mode : 3.7. V AHZ Function When voltage or current (V/A) measurement mode is selected, the V AHz funtion is available. Push HZ key less than one second to select this frequency measurement mode at V/A modes . The frequency is measured by auto ranging. The maximum frequency range is 99.99K Hz. The sensitivity of signal input is 5% full scale of signal in voltage or current mode typically. Configuration RANGE FR1 200.0Hz FR2 2.000KHz FR3 99.99KHz Original State (Auto/Manual) ‘Max’ Active Show Max. DN+K - DN ‘Min’ Active Show Min. DN+K - DN Push MMX Push MMX > 1s Push MMX ‘Max’ ‘Hold’ active Hold Max. DN+K - DN Value ‘‘Min’ ‘Hold’ active Hold Min. DN+K - DN Value Push HOLD Push HOLD Push MMX Push REL Push REL > 1s Show DN+K - DN Push REL < 1s
V 1.5 26 2016/04/27 ES252 3.8. Phase-rotation detection The ES252 provide the phase rotation to find the phase sequence of 3- phase of power source. The function will be available when user push VAHz key larger than one second. The initial range will be set to 200.0V range when phase -rotation mode is selected. Set COM terminal to the 1 st voltage source and Vin terminal to the 2nd voltage source. The LOCK symbol of LCD segment starts blinking when ACV measurement is less than 80Vrms. When the AC voltage measurement is larger than 80Vrms (40 ~ 80Hz), the LOCK symbol will stop blinking and it means the 1 st phase is locked. Then set Vin terminal to the 3 rd voltage source within 5 seconds. If the AC voltage measurement is larger than 80Vrms (40 ~ 80Hz) again, the phase -rotation sequence will be determined and 1 23 or 321 symbols of LCD segment will be turn on to indicate the phase -rotation sequence. If the AC voltage is less than 80Vrms or signal frequency is not within 40~80Hz in 5 seconds duration, the phase-rotation detection will be aborted. Push VAHz key larger than one second will abort the detection also. The LOCK symbol will be disappeared when procedure is aborted. Note: The time limit is 5 seconds between Step2 & Step 3.
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- Serial Data Output The RS232 function will be activated if press down the HOLD key and last for 2 seconds , RS232 symbol will be shown on the LCD display . The serial data sent to RSOUT pin periodically at every A/D conversion cycle by 3 times per second. The data format complies with 8Bits transmission code with a baud rate of 9600. The host can use RS232 interface to read the data. A single data packet includes a start bit (always 0), 8 data bits with no parity check bit, and a stop bit (always 1). The high and low voltage levels correspond to DGND and V- respectively. RSOUT remains at 1 (high) when it is inactive. Hence the start bit (0) could be used as t he triggering signal to begin the reading process. The following figure shows the data format of a single packet. Single packet 0 1 MSB LSB -3V D7 D6 D5 D4 D3 D2 D1 D0 One data block consists of 17 packets. The following figure shows the format of a data block. The Header and Device code leads the whole packets. The range packet indicates the decimal point position on LCD panel of meter. Main_Digit1-3 consists of the readings on the LCD panel. The function packet indicates the measurement mode of the meter. Status 1-4, Unit, Phase give the other status of the meter. CR and LF are delimiters used to separate the blocks.
V 1.5 28 2016/04/27 ES252 Header Device Range Main_Digit1 Main_Digit2 Main_Digit3 Function1 Function2 Function3 Status1 Unit Phase CR LF Status2 Status3 Status4 0 01 01 01 1 0 01 01 01 10 01 01 01 1 0 10 1 D 7 D 0 The meter always outputs the current value shown on LCD screen to the serial por t. The detailed data format of each packet is listed below. D0 D1 D2 D3 D4 D5 D6 D7 a01 0 0 0 0 1 1 1 1 Header a02 1 0 0 0 0 0 1 1 Device a03 X X X X DP1 DP2 DP3 X Range a04 M_SIGN X X X X X X X Main_Digit1 a05 Digit33 Digit32 Digit31 Digit30 Digit23 Digit22 Digit21 Digit20 Main_Digit2 a06 Digit13 Digit12 Digit11 Digit10 Digit03 Digit02 Digit01 Digit00 Main_Digit3 a07 V A Ohm Continuity Diode Capacitance Hz X Function1 a08 VAH Z ℃ ℉ X EFmode X Clamp LED Function2 a09 ADP0 ADP1 ADP2 ADP3 X X X X Function3 a10 AUTO MANU AC DC OL X X X Status1 a11 SLB3 SLB2 SLB1 LBA T30s X X X HOLD Status2 a12 REL ZERO MAX MIN X X X X Status3 a13 Danger X X DISCH X X X X Status4 a14 Mega Kilo X Mili X Micro X Nano Unit a15 X PHSEQ LOCK 321 123 Time_out X X Phase a16 0 0 0 0 1 1 0 1 CR a17 0 0 0 0 1 0 1 0 LF Note： 1. X undefind. 2. Whole packet is shown by LSB first.
V 1.5 29 2016/04/27 ES252 4.1. RANGE This packet indicates range state of the meter. The DP1 – DP3 corresponding DP1 – DP3 of LCD segment (see section 5 ). In DCV 2.000 V range, this a03 packet will set xxxx001x. If change to 20.00V the packet will be xxxx010x. D0 D1 D2 D3 D4 D5 D6 D7 a03 X X X X DP1 DP2 DP3 X 4.2. Main_Digit1 –Main_Digit3 Main_Digit1 – Main_Digit3 is the readings of measurement result shown on LCD panel. DigitN3 – DigitN0 consist of 4-bit BCD code. The M_SIGN is the sign bit of readings. D0 D1 D2 D3 D4 D5 D6 D7 a04 M_SIGN X X X X X X X a05 Digit33 Digit32 Digit31 Digit30 Digit23 Digit22 Digit21 Digit20 a06 Digit13 Digit12 Digit11 Digit10 Digit03 Digit02 Digit01 Digit00 4.3. FUNCTION The packets of a07- a09 indicate the measurement mode of the meter. The following table summarizes the transmitted bit for each mode. Note that the encoding of this packet is different from the encoding of FC1-FC5 switch. For example, if the meter operates in V oltage mode, this a07 packet is 10000000. If VA H Z key is pushed to V AHZ mode, the a08 will be 10000000 also. D0 D1 D2 D3 D4 D5 D6 D7 a07 V A Ohm Continuity Diode Capacitance Hz X a08 VAH Z ℃ ℉ X EFmode X Clamp LED a09 ADP0 ADP1 ADP2 ADP3 X X X X 4.4. STATUS The a10-a13 packets indicate the whole status when ES252 is in normal operation. For example, if meter is operated at ACV / MANU range, then a10 packet will set 011000xx. The format of the four packets are shown below. D0 D1 D2 D3 D4 D5 D6 D7 a10 AUTO MANU AC DC OL X X X a11 SLB3 SLB2 SLB1 LBA T30s X X X HOLD a12 REL ZERO MAX MIN X X X X a13 Danger X X DISCH X X X X
V 1.5 30 2016/04/27 ES252 AUTO: When auto range is selected. MANU: When manual mode is selected. AC: When AC mode is selected. DC: When DC mode is selected. OL: When ‘OL’ is displayed on LCD. SLB3/SLB2/SLB1: When low battery segment is shown on LCD. LBAT30s: When ‘Lobt’ is shown on LCD. HOLD: When Data HOLD mode is active. REL: When Relative mode is active. ZERO: When Zero function is active in DCA clamp mode. MAX/MIN: When MAX/MIN mode is active. Clamp: When clamp mode is selected. (Clamp pin is pulled to V-) Danger: Abnormal applied voltage warning symbol is active on LCD. DISC: The ‘DisC’ is shown on LCD. It means the DUT is necessary to be discharged on Cap mode. 4.5. Unit This packet indicates the measurement unit of the LCD display. D0 D1 D2 D3 D4 D5 D6 D7 a14 Mega Kilo X Mille X Micro X Nano Mega = 1E6, Kilo=1E3, Mille=1E-3, Micro=1E-6, Nano=1E-9 4.6. Phase The a15 packet is the status of phase-rotation function shown on LCD panel. When Phase-rotation function is active, the PHSEQ is set to 1. When the first target measurement is made, the LOCK status is set to 1 also. Then if the second target m easurement is made, the phase- rotation check is finished. The 321 or 123 phase will be shown on LCD. If the second target could not be finished or the time period is lager than 5 seconds, the Time_out flag will be set to 1. The format of this packet is shown below. D0 D1 D2 D3 D4 D5 D6 D7 a15 X PHSEQ LOCK 321 123 Time_out X X 4.7. CR Carriage return: The transmitted code is 00001101. 4.8. LF Line feed: The transmitted code is 00001010.
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- Miscellaneous The conditions, which the meter turns on the buzzer, include: (1) Changing measurement mode generates one beep. (2) Pressing any of the push functions generates one beep, if the function is valid. (3) Power on and re-power on generate one beep. (4) Input overflow in voltage and current mode generates one beep every 0.3 seconds (or 3.33 beeps per second.) (5) Hazard voltage indication is active generates one beep per second and could be disabled by DISDGB pin. (6) Continuity(diode) check generates a continuous 2KHz beep whenever the measurement is less then 30Ω(30mV) (7) Auto power off generates a 2KHz beep sound that lasts for 1.5 seconds. The following figures show the output waveform from the BUZOUT pin. 0.5 mS (a) Continuous 2KHz beep 0.3 sec 0.15 sec (b) 3.33 beep/sec
V 1.5 32 2016/04/27 ES252 5.1. LCD Panel S01 S02 S03 S04 S05 S06 S07 S08 S09 BP1 SCAN AUTO 4A 4B 3A RS232 BUZZER LED DIODE BP2 MANU AC 4F 4G 3F 3B 2F 2A 2B BP3 APO MINUS 4E 4C 3E 3G 2E 2G 2C BP4 DANGER DC 4D DP3 3D 3C DP2 2D DP1 S10 S11 S12 S13 S14 S15 S16 S17 S18 BP1 1A HOLD REL MAX SLB1 μ2 M n Vin BP2 1F 1B LOCK MIN SLB2 m2 K μ1 COM BP3 1E 1G 321 ℃ SLB3 V Ω m1 mAin BP4 1D 1C 123 ℉ ADP A Hz F Ain LCD Backplane Waveform BP1 BP2 BP3 BP4 V- +3.1 V- +3.1 V- +3.1 V- +3.1
V 1.5 33 2016/04/27 ES252 5.2. LCD Display On Condition LCD Annunciator Condition V In voltage measurement mode, and diode measurement mode. A In current measurement mode. Ω In resistance measurement mode, and continuity mode. F In capacitance measurement mode. In continuity check mode. In diode mode. Hz In frequency mode. ADP When ADP0-3 mode is active. DC In DC voltage or DC current mode. AC In AC voltage or AC current mode. SCAN When ACV/DCV scan mode is active AUTO When automatic full scale range selection is enabled. MANU In manual mode. HOLD When HOLD function is enabled. When Relative function is enabled. MAX When MAX function is enabled. MIN When MIN function is enabled. m1 In capacitor measurement mode and the full scale range is in the order of mF. µ1 In capacitor measurement mode and the full scale range is in the order of uF. n In capacitor measurement mode and the full scale range is in the order of nF. m2 In voltage or current measurement mode and the full scale range is in the order of 10 -3. µ2 In current measurement mode and the full scale range id in the order of uA. M In resistance measurement mode and the full scale range is in the order of MΩ. K In resistance measurement mode and the full scale range is in the order of KΩ. ℃ In temperature measurement mode and when the unit is ℃. ℉ In temperature measurement mode and when the unit is ℉. When the reading is exceeding default hazardous live voltage or OL in DCV or ACV , the HV warning symbol will be display. It will be active also when abnormal voltage applied at R/C/D/F modes. APO When auto power off function is enabled. SLB1 When voltage (ref. to V-) of LBA T9 pin is less than Vt1, SLB1 will disappear. SLB2 When voltage (ref. to V-) of LBA T9 pin is less than Vt2, SLB2 will disappear. SLB3 When SLB2 disappears for 8 seconds, SLB3 will be blinking. RS232 When RS232 output is enabled. TEST When LED measurement function is enabled. LOCK When Phase -rotation mode is active, the LOCK symbol will be blinking. After the first target measurement is made successfully, the LOCK symbol will stop blinking. 123 or 321 When the second target measur ement is finished, the phase rotation direction is confirmed.
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5.3 Operating Timing
ES252 incorporates a dual slope ADC with four phases: ZI, AZ, INT and DINT. The timing of each phase is listed below. (1) V oltage / Diode /ADP / Manual Current (for clampmeter) measurement: Phase High resolution ZI 50ms AZ 25ms INT 100ms DINT 155ms (2) Current mode for multimeter/Auto Current mode for clampmeter/2-range auto voltage mode: Phase DC / AC DC Lower Range ZI 50ms 50ms AZ 25ms 25ms INT 100ms 1000ms DINT 155ms 175ms (3) Continuity / Ohm measurement: Phase Time ZI 50ms AZ 100ms INT 25ms* DINT 155ms Note: INT time = 250ms for 20.00Ω range (4) Frequency / V AHz measurement: Every conversion takes 1.05 second. (5) Temperature measurement: Every conversion takes 1.25 second. Note: 1. In the frequency measurement with auto mode, if the range is changed, the internal clock rate will increase ten times and the new measurement cycle becomes 1/10 times of the original cycle until the range is stable.
V 1.5 35 2016/04/27 ES252 Application Circuit 1. AV G Circuit 123456 A B C D 6 5 4 3 2 1 D C B A Title Num be rRev ision Size B Date:31-Jul-2015Shee t of File:D:\\Protel 99\\Protel file\\K A036 \\KA0 36.dd bDrawn B y : V R2 17 ADP 1 TEMP i n2 CI NT3 CAZ 4 RAZ 5 V RH 6 DACO7 VR _ADP8 V R_ CL AMP9 OHMC310 OHMC211 OHMC112 O R1 13 V R5 14 V R4 15 V R3 16 OVSG 18 V R1 19 mV in 20 AC VL 21 AC VH22 ADI 23 ADO 24 TEST5 25 FRE Q37 DI S_RS 23238 CLAMP39 A SE L43 T SY M B44 TS EL45 DIOV46 BP447 BKOUT35 ALARM34 CESEL33 BP348 BP249 SEG1 455 SEG1 356 SGND26 OVX27 SEG1 257 SEG1 158 SEG1 059 SEG0 960 SEG0 861 SEG0 762 SEG0 663 SEG1 554 SEG1 752 SEG1 653 CA-29 CA+30 R10K31 R1K32 DI S_200M36 SEG0 564 SEG0 465 SEG0 366 SEG0 267 SEG0 168 MAXMIN69 REL70 HZ71 KEY72 HOLD73 RANGE74 CALEN75 O SC2 76O SC1 77 IVS 100 SLEEP 78RS OUT 79BZOUT 80FC5 81FC4 82FC3 83FC2 84FC1 85SLACDC 86C+ 87C- 88SCL 89SDA 90L BA T 91V- 92V- 93COFFN 94COFFP 95V+ 96DGND 97AGND 98AGND 99 OVH28 DISDGB40 BKLIT41 AP OSEL42 BP150 SEG1 851 ES252 ADP TEM P i n R4100K R5100K C2220nF C1220nF VRH C1222nF C3220nF C1322nF R15100 R161 K R18101K R191.111M Precisio n Res istors R1710.01K VIN mVi n SCL SDA BZOU T SEG16 SEG17 SEG18 SEG12 SEG13 SEG14 SEG15 SEG08 SEG09 SEG10 SEG11 SEG04 SEG05 SEG06 SEG07 SEG03 SEG02 SEG01 CALEN LBA T SELKEY SLEEP RS OUT FC5 RANGE HOLD FC2 FC3 FC4 FC1 MMX R EL SL ACDC HZ
4 MH z
A COM 0. 01 0. 99 C4 470nF CL AM P SGND C15220pF Cl ose t o IC C170-100pF OVX OVH R32180K R36200 C6 470nF R349K R301K C ESEL BKOU T DIOV AL ARM BP4 BP3 BP2 BP1 TSEL TSY MB A SEL A POSEL BKLIT DISDG B C162.2uF R35200 mVi n R262. 2K P TCVIN OVX R272. 2K P TCOVH Q92N 2222 Q82N 2222 R312.5M x 4 / 1000V SW1 9m VI NR33100K Q72N 2222 Q62N 2222 Q11 2N 2222 Q10 2N 2222 SW2 0OVX SW2 1OVH C141uF FREQ V/R/TEMP Metallized Polypropylene Film Capacitor : C1 Metallized Polyester Capacitor : C2 +/- 10% Q132N 2222 Q12 2N 2222 SW2 2Fr eq Q52N 3904 V - Freq Precisio n Res istors LM 385_1.25V R14 V + Q12N 3904 R1115K R1320K R12100 TEM P i n V R1200 R2910M R9300 DIP 2N3904 Cl ose t o H1C TEM P _ COM R28 + C9 10uF + C810uF Z R2 7. 5V V + C100.1uF C110.1uF Z R15. 6V SW4 Pow er S witch V - Ba t- Ba t+DC 3.0V mV Mo de R/S /D/C Mod e Frequency Mode For Temperature SW1 5 TEM P _ COM C OM SGND For T em pera ture F o r D MM R37 40M ~ 60M EF 3Copper A rea ADP R3810K R39 15K R40 15K TEST5 ADI ACVH ADO_ AVG ACVL +C19 1uF+ C20 1uF C18 0.1uF R4356K R4256K R413. 9K D81N 4148 D71N 4148 C214.7uF ACVL ACVH ADO ADI TEST5 SW1 8 Te mp Q14 2N 2222 C2210nF Jack Chang 2000/4000/6000 Counts Easy Type DMM V3 ES252 AVG Schematic D3 D1 DIS_R S232 DIS_200M
V 1.5 36 2016/04/27 ES252 Package Information 1. 100L LQFP Outline drawing 2. Dimension parameters