486 KEITHLEY | Alldatasheet
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Technical content
www.keithley.com 1.888.KEITHLEY (U.S. only) A GREATER MEASURE OF CONFIDENCE
486 Picoammeter
487 Picoammeter/ Voltage Source
486:
- 10fA sensitivity
- 180 readings per second
- IEEE-488 interface 487:
- Resistivity measurements (<1Ω to >10 16Ω )
- ± 500V source
- 10fA sensitivity
- 180 readings per second
- IEEE-488 interface
The Model 486 is a 51⁄2-digit autoranging picoammeter designed for low current applications where fast reading rates must be made. It offers a speed of 180 readings per second. The 486 is ideal for low-level DC current applications, such as:
- PMT current measurements
- mass spectrometer current measurements
- probe current measurements in electrochemistry
- p lasma generated currents
- ion chamber currents Operation is fast and convenient. Selectable analog and digital filters provide optimum wide-band per- formance with minimum noise. Autoranging selects the most appropriate range within 100ms. The meas- urement buffer holds up to 512 readings for fast data acquisition. Any reading within the buffer may be displayed, or the entire buffer may be searched for the maximum and minimum values. Other important features include REL, which allows measurements to be made relative to a selectable baseline. ZERO CHECK and CORRECT functions correct for voltage offset errors using front panel or soft- ware commands. The IEEE-488 interface provides simple integration and convenient user interaction. Digital calibration can be accomplished over the bus or completely from the front panel. The display features three selectable intensities (bright, dim, and off) for use in light-sensitive environments.
487 Picoammeter/Voltage Source
The Model 487 is designed for measurement of low currents and very high resistances. This instrument incorporates all the capabilities of the 486, and adds a programmable ±500V source. This combination of picoammeter and voltage source provides a powerful high resistance meter and fast picoammeter in one instrument. The 487 makes current measurements from 10fA to 2mA. T wo voltage source ranges are available: a 500V range with 10mV resolution and a 50V range with 1mV resolution. A PRESET button allows the user to toggle between two separate source values. The 487 sources up to 500V , measures the current with 10fA sensitivity, and then instantly calculates the resistance value, from 500mΩ to 5 × 10 16Ω . The unit displays either current or resistance. Reading inter- vals from 10ms to 1000s can be programmed, simplifying tests that require a predetermined “soak” time. Two displays, one for current readings and one for voltage sourcing, permit the voltage setting and the measured current to be viewed throughout the measurement. The Model 487 and the 6517A are the most effective test instruments for performing such tasks as resis- tivity, I-V measurements, component leakage, and insulation resistance. A common test procedure, writ- ten by the American Society of T esting and Materials, D257: D-C RESISTANCE OR CONDUCTANCE OF INSULATING MATERIALS, is easily performed with the 487 or the 6517A.
Ordering Information
487 Picoammeter/Voltage
These products are available with an Extended Warranty. Accessories Supplied 237-ALG-2 Low Noise Triax Cable, 3-Slot Triax to Alligator Clips, 2m (6.6 ft) Model 487 also comes with 236- ILC-3 Interlock Cable, 3m (10 ft) Designed for low current applications that require fast readingsLOW I/HIGH R PRODUCTS
www.keithley.com 1.888.KEITHLEY (U.S. only) A GREATER MEASURE OF CONFIDENCE Model 486 and 487 SpecificationsLOW I/HIGH R PRODUCTS ACCURACY (1 Year)* Rise Time (10%–90%) 18°–28°C Analog Filter RANGE RESOLUTION ±(%rdg+offset) OFF ON 2n A 1 0 f A 0.3 + 500 fA 12 ms 70 ms 20 nA 100 fA 0.2 + 3 pA 4 ms 17 ms 200 nA 1 pA 0.15 + 20 pA 800 µs 4 ms 2µ A1 0p A 0.15 + 200 pA 380 µs 2 ms 20 µA 100 pA 0.1 + 2 nA 160 µs 370 µs 200 µA 1 nA 0.1 + 20 nA 160 µs 370 µs 2m A 1 0 n A 0.1 + 200 nA 160 µs 370 µs * When properly zeroed. MAXIMUM OVERLOAD: 350V peak on nA ranges and 2µA range; 50V peak on 20µA, 200µA, and 2mA ranges. Higher voltage sources must be current limited at 3mA. INPUT VOLTAGE BURDEN: <200µV (18°–28°C) for inputs <100µA; <2mV for inputs ≥ 100µA; 20µV/°C tempera- ture coefficient. TEMPERATURE COEFFICIENT (0°–18°C & 28°–50°C): ±(0.15 × applicable accuracy specification)/ °C. NMRR: >60dB at 50Hz (LINE 50Hz integration) or 60Hz (LINE 60Hz integration). ANALOG OUTPUT: Range: ±2V for full range input (non-inverting). Accuracy: ±(2.5% + 3mV); resistive loads >2kΩ ; 18°–28°C. Impedance: <100Ω , DC–2kHz. RANGING: Automatic or manual. AUTORANGING TIME: <200ms to final range (analog filter OFF). MAXIMUM READING RATES (readings/second): EXTERNAL TRIGGERED VIA INTEGRATION CONTINUOUS INTO INTO IEEE-488 SETTING RESOLUTION DATA STORE DATA STORE BUS FAST 4 1⁄2-Digit 100 180 16 LINE 60Hz 5 1⁄2-Digit 40 44 14 LINE 50Hz 5 1⁄2-Digit 33 38 12 One-shot on TALK, G7 data format. VOLTAGE SOURCE (487 only): ACCURACY TEMPERATURE RANGE STEP (1 Year) NOISE COEFFICIENT (maximum SIZE 18°–28°C (p-p)* 0°–18°C & value) (typical) ±(%setting+offset) 0.1–10Hz 28°–50°C ±505.00 V 10 mV 0.15 + 40 mV <1.5 mV 80 ppm + 2 mV/°C ±50.500 V 1 mV 0.1 + 4 mV <150 µV 50 ppm + 200µV/°C * With LO terminal connected to chassis. SELECTABLE CURRENT LIMIT: 2.5mA ±0.5mA or 25µA ±5µA. WIDEBAND NOISE: <30mV p-p 0.1Hz to 20MHz. TIME STABILITY:±(0.003% + 1mV) over 24 hours at constant temperature. OUTPUT RESISTANCE: <2.5Ω . V/I OHMS (487 only) Used with voltage source; resistance calculated from voltage setting and measured current. V/I OHMS accuracy equals voltage source accuracy plus ammeter accuracy. Typical accuracy better than 0.6% for readings between 1k Ω and 1TΩ . IEEE-488 BUS IMPLEMENTATION PROGRAMMABLE PARAMETERS: All parameters programmable except for IEEE-488 bus address and frequency for line integration. TRIGGER TO FIRST BYTE: <50ms (trigger on TALK, ATN false to talker DAV true, G7 data format). GENERAL DATA STORE and MIN/MAX: Stores up to 512 readings and identifies minimum and maximum reading. PROGRAMMABLE READING INTERVAL: 10ms to 999.999s in 1ms increments. TRIGGER: One-shot or continuous from front panel, IEEE-488 bus, and rear panel BNC. PROGRAMMABLE TRIGGER DELAY: 1ms to 999.999s in 1ms increments. DISPLAY: One ten character plus one eight character alphanumeric LED displays with normal/dim/off intensity control. MAXIMUM VOLTAGE BETWEEN VOLTAGE SOURCE AND CURRENT METER: 500V DC. MAXIMUM VOLTAGE BETWEEN CHASSIS AND VOLTAGE SOURCE OR CUR- RENT METER: 500V DC. REAR PANEL CONNECTORS: Input Connector: 3-lug triax. Analog Output: 5-way binding post. External Trigger and Meter Complete: BNC connectors. IEEE-488 Connector: Chassis grounded. Voltage Source Output (487 only): 5-way binding post. Interlock Connector (487 only): 3-pin miniature DIN. EMC: Conforms to European Union Directive 89/336/EEC. SAFETY: Conforms to European Union Directive 73/23/EEC (meets EN61010- 1/IEC 1010). ENVIRONMENT: Operating: 0°–50°C, <70% RH up to 35°C; linearly derate 3% RH/°C, up to 50°C. Storage: –25° to 60°C. WARM-UP: 2 hours to rated accuracy. POWER: 105–125V AC or 210–250V AC (external switch selectable), 90–110V and 180–220V AC version available. 50Hz or 60Hz, 45VA maximum. DIMENSIONS: 90mm high × 213mm wide × 397mm deep (31⁄2 in × 83⁄8 in × 155⁄8 in). ACCESSORIES AVAILABLE CABLES 236-ILC-3 Safety Interlock Cable 237-ALG-2 Low Noise Cable 7078-TRX-3 3-Slot Male Triax to 3-Slot Male Triax Cable, 0.9m (3 ft) ADAPTERS 6171 3-Slot Male Triax to 2-Lug Female Triax 6172 2-Slot Male Triax to 3-Lug Female Triax 7078-TRX-BNC 3-Slot Male Triax to BNC Adapter TEST FIXTURE
8008 Resistivity Chamber
4288-1 Single Fixed Rack Mount Kit 4288-2 Dual Fixed Rack Mount Kit 4288-4 Dual Fixed Rack Mount Kit