1232-A

1620 IET | Alldatasheet

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Technical content

1620 PRECISION CAPACITANCE MEASUREMENT SYSTEM

Performance: See 1615-A for performance specifi cations. Supplied: 1615-A Precision Capacitance Bridge. 1311-A Oscillator. 1232-A Tuned Amplifi er and Null Detector. 1232-P2 Preamplifi er added in 1620-AP .

534 Main Street, Westbury, NY 11590

IET LABS, INC. in the GenRad Tradition www.ietlabs.com TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988

Contents

p. 2 Applic. pp. 4-8 Selection pp. 9-11 Products pp. 12-87 GenRad prod ucts pp. 50-87 Index p. 89 Accurate and precision measurements of capaci- tance and dissipation factor Measurement of circuit capacitances Dielectric measurements Intercomparison of capacitance standards diff ering in magnitude by as much as 1000:1 10-5 pF to 11.1 μF, 2- or 3- terminal 0.01% accuracy, 1 ppm resolution Lever balance, in-line readout Reads dissipation factor or conductance Precision Capacitance Measurement System 1620-A High Precision Capacitance Measurements1620-A High Precision Capacitance Measurements Electronic cat/1482/09-15-03 The 1620-A is a self-contained assembly of the 1615-A Capacitance Bridge with appropriate os- cillator and null detector for measurements at 11 frequencies between 50 Hz and 10 kHz. For applications requiring other or higher frequen- cies, to 100 kHz, the 1615-A Bridge can be sup- plied separately and the oscillator and detector selected to meet your needs. Model 1620-A Measurement System The 1615-A Capacitance Bridge brings to the mea- surement of capacitance, the intercomparison of stan- dard, and to the measurement of dielectric properties an unusual degree of accuracy, precision, range, and convenience. High accuracy is achieved through the use of pre- cisely wound transformer ratio arms and highly stable standards fabricated from Invar and hermetically sealed in dry nitrogen. For calibration these standards can be intercompared. Two- or Three- Terminal Connection - Accurate three- terminal measurements can be made even in the presence of capacitances to ground as large as 1 μF, as might be encountered with the unknown connected by means of long cables. The bridge has the neces- sary internal shielding to permit one terminal of the unknown capacitor to be directly grounded, so that true two-terminal and three-terminal measurements can both be made over the whole capacitance range. Convenient Operation - For both capacitance and dissipation factor, the balance controls are smoothly operating, lever-type switches, The readout is digital and decimal point is automatically positioned. Each capacitance decade has a - 1 position to facilitate rapid balancing. The 1615-A elementary diagram is also clearly de- lineated on the front panel of the bridge. Changes in connections and grounds are automatically indicated, as you switch the bridge terminals for diff erent mea- surement conditions. Extend Range to 11.1 F - With the 1615-P1 Range- Extension Capacitor, the 1615-A will measure to a maximum of 11.11110 F. This capacitor plugs into front-panel bridge terminals and can be adjusted for calibration to the bridge standards.

ORDERING INFORMATION

Features

Power: 105 to 125 V and 210 to 250 V, 50 to 400 Hz, 22 W for oscillator. Dimensions: Bench: 48.3 cm H x 50.2 cm W x 28.0 cm D (19" x 19.75" x 11") Weight: 27 kg (59 lb.) net, 44 kg (96 lb.) shipping 1620-A, 115 V 1620-9701 1620-A, 230 V 1620-9702 1620-AP , with 1232-P2, 115V 1620-9829 1620-AP , with 1232-P2, 230 V 1620-9830 1615-A CAPACITANCE BRIDGE The 1615-A is an accurate, high-precision bridge for the mea- surement and intercomparison of standard capacitors, circuit component capacitors, or dielectric materials. It is available with oscillator and detector in the 1620-A system. Or, to take full advantage of its wide frequency range, the bridge can be ordered separately for use with oscillator and detector especially selected for your purposes. Capacitance Measurement: Range: 10 aF to 1.11110 μF (10-17 to 10-6 F) in 6 ranges, direct reading, 6-fi gure resolution; least count 10-17 F (10 aF). With Range Extension Capacitor, upper limit is 11.11110 μF. Accuracy: At 1 kHz, ±(0.01% + 0.00003 pF). At higher fre quencies and with high capacitance, additional error is: [±3 x 10 -5% + 2 (CμF) x 10-3% ±3 x 10-7 pF} x (fkHz)2 At lower frequencies and with low capacitance, accuracy may be limited by bridge sensitivity. Comparison accuracy, external standard to unknown,1 ppm. Dissipation Factor: Range: At 1 kHz, 0.000001 to 1; 4-fi gure resolution, least signifi cant digit count: 0.000 001 (10-6); range varies directly with frequency. Accuracy: ±[0.1% of measured value + 10-5 (1 + fkHz + 5fkHzCμF)]. Conductance: Range: 10-6 μS to 100 μS, ranges +, 2 ranges-, 4 fi gure resolution, least count 10-6 μS, independent of frequency, range varies with C range. Accuracy: ±[1% measured value + 10-5 μS + 6 x 102fkHzCμF x (1 + fkHz + 5fkHzCμF)μS]. Frequency: Approximately 50 Hz to 10 kHz. Useful with re- duced accuracy to 100 kHz. Below 100 Hz, resolution better than 0.01% or 0.01 pF required preamplifi er or special detector. Temperature coeffi cient of capacitance is less than 5 ppm/C for the 1000, 100, and 10 pF standards, slightly greater for the smaller units. Generator: Maximum safe generator voltage (30 x f kHz) volts, 300 V max. If generator and detector connections are interchanged, 150 to 500 V can be applied, depending on switch settings. IET 1311-A Audio Oscillator is recommended. IET LABS, INC. in the GenRad Tradition www.ietlabs.com TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988 Con tents p. 2 Applic. pp. 4-8 Selection pp. 9-11 Products pp. 12-87 GenRad prod ucts pp. 50-87 Index p. 89 1620-A Precision1620-A Precision Capacitance Measurement System Capacitance Measurement System Electronic cat/1620A p2/05-26-05

Bridge detector at audio frequencies; with 1232-P2 Preamplifi er it is equally sensitive for extremely high- impedance sources Audio preamplifi er and general-purpose, tunable or broadband audio amplifi er Sensitive audio wave analyzer for approximate measurements

20 Hz to 20 kHz, 50 and 100 kHz

0.1 μS sensitivity Brandwidth approximately 5% 120 dB gain A sensitive null detector like this is the key to many a fussy bridge measurement. Battery operation frees the 1232 from power-line noise and makes it ultra portable. Low-noise solid state circuitry and high gain make it very sensitive. Its tunability and choice of bandwidth enable your to reject broadband noise as well as the harmonics that might otherwise impair good measurements. SPECIFICATIONS Frequency: Tunable fi lters:20 Hz to 20 kHz in 3 ranges, between 2% and 6% bandwidth to 15 kHz. Second harmonic at least 34 dB down from peak, third harmonic at least 40 dB down, rejection fi lter on two highest ranges reduces 60 Hz level to at least 60 dB below peak re- sponse (50 Hz level is down >50 dB). Dial accuracy is ±3%. Fixed-Tunable Filters: 50 kHz, 2-nd harmonic is 44 dB down; 100 kHz, 2-nd harmonic is 53 dB down. Flat Response: ±3 dB from 20 Hz to 100 kHz. Sensitivity: See fi g. 1. Typically better than 0.1 μS over most of the frequency range. Noise Level: Referred to input: See fi g. 2. Noise at 1 kHz < 2 dB at optimum source impedance of 27 kΩ. Referred to output: < 5 mV on FLAT fi lter-frequency position, main gain setting, and 20 dB switch position. <50 mV in MAX SENS position. Signal Input: Impedance: Approximately 50 kΩ at max gain; var- ies inversely with gain to 1 MΩ at min gain. Max Safe Voltage: 200 Vac or 400 Vdc. Output: Voltage Gain: Approximately 120 dB on the tunable ranges; 100 dB, fl at range; 106 dB at 50 kHz; 100 dB at 100 kHz position. Level: 1 V into 10 kΩ when meter indication is full scale. Internal Impedance: 3 kΩ. Meter Linearity: dB diff erences are accurate to ±5% ±0.1% division for inputs of less than 0.3 V. Compression: (meter switched to LOG) Reduces full-scale sensitivity by 40 dB. Does not aff ect bottom 20% of scale. Attenuation: (meter switched to - 20 dB). Linear response with 20 dB less gain than MAX SENS. Distortion: (fi lter switched in FLAT position): <5 % (due to meter recti- fi ers). Terminals: Input: 874 Coaxial Connector. Output: binding posts. Available: 1232-P2 Preamplifi er to maintain sensitivity of 1232-A at low frequencies when operating from a source impedance above 100 k Power: 12 Vdc, from 9 mercury (Eveready type E4 or equivalent) cells in series. Estimated battery life 1500 hours. Mechanical: Convertable-bench cabinet. Dimensions: 15.2 cm H x 20.3 cm W x 19.0 cm D (6" x 8" x 7.5"). Weight: 2.6 kg (5.75 lb) net, 3.7 kg (8 lb) shipping. 1232-A 1232-9701 Tuned Amplifi er and Null Detector 1232-AP 1232-9829 Tuned Amplifi er and Null Detector with preamplifi er Electronic cat/1232A/05-26-05 IET LABS, INC. in the GenRad Tradition www.ietlabs.com TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988 p. 2 Applic. pp. 4-8 Selection pp. 9-11 Products pp. 12-87 GenRad prod ucts pp. 50-87 Index p. 89 Precision Capacitance Measurement System 1232-A Tuned Ampifi er And Null Detector1232-A Tuned Ampifi er And Null Detector

The 1232-P2 has particular application to measurements with the 1615-A Capacitance Bridge. It increases sensitivity for measure- ments made at frequencies well below 1000 Hz if the bridge is set to both its lowest C and D (not G) ranges simultaneously. Low- frequency measurement of small samples of dielectric materials can be made more accu- rately with the addition of this preamplifi er. SPECIFICATIONS Voltage Gain: Approximately 0.7. Noise: (referred to input) Open-circuit equiva- lent, 0.1 pA. Short-circuit equivalent, 0.3 μS (when used with Type 1232-A tuned to 100 Hz). Impedances: Input: > 100 mΩ in parallel with 70 pF. Optimum Source: 3 MΩ. Output: 10 kΩ. Connectors: 874 on cables, input and output. Power: 12 V, 200 μA, supplied by 1232-A. Mechanical: Cpecial cabinet. Dimensions: 15.2 cm H x 1.9 cm W x 19.0 cm D Weight: 0.43 kg (0.94 lb) net, 1.9 kg (4 lb) shipping. 1232-P2 1232-9602 Preamplifi er Dimensions: Bench: 32.4 cm H x 48.3 cm W x 26.7 cm D Rack: 31.1 cm H x 48.3 cm W x 21.7 cm D Weight: 18 kg (39 lb.) net, 27 kg (58 lb.) shipping 1615-A Capacitance Bridge Bench Model 1615-9801 Rack Model 1615-9811 ACCESSORIES 1615-P1 Range-Extension Capacitor 1615-9601 1615-P2 Coaxial Adaptor, G900 to binding posts 1615-9602 Detector: IET 1232-A Tuned Amplifi er and Null Detector is recom- mended. For increased sensitivity needed to measure low-loss small capacitors (on lowest C and D ranges simultaneously) at frequencies below 1 kHz, use the 1232-AP Tuned Amplifi er and Null Detector or 1238 Detector (with 1311-A Audio Oscillator). Connections: Gen Input; Binding posts, ground terminal with shorting link. Detector, External Std, and Unknown; 874 connectors, Unknown, 2-Terminals; Binding posts. Required: Oscillator and Detector. Supplied: 874-WO Open-Circuit Termination, 874-R22A Patch Cord, 274-NL Patch Cord. Available: Type 1615-P1 Range Extension Capacitor Type 1615-P2 Coaxial Adaptor converts 2-terminal bind- ing post connection of 1615-A bridge to G900 Precision Coaxial Con- nector for highly repeatable connections and enables measurements with adaptor to be reading by compensating for terminal capacitance. IET LABS, INC. in the GenRad Tradition www.ietlabs.com TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988 Con tents p. 2 Applic. pp. 4-8 Selection pp. 9-11 Products pp. 12-87 GenRad prod ucts pp. 50-87 Index p. 89 1232-P2 Preampifi er1232-P2 Preampifi er Precision Capacitance Measurement System IET cat/1232-P2/07-19-05