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IET Labs 1232-A Tuned Ampifier And Null Detector
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IET Labs 1232-A Tuned Ampifier And Null Detector


IET Labs 1232-9701
Click image to enlarge

 IET Labs 1232-9701

Features:
  • Bridge detector at audio frequencies; with 1232-P2
    Preamplifier it is equally sensitive for extremely high impedance sources
  • Audio preamplifier and general-purpose, tunable or
    broadband audio amplifier
  • 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

  Additional Images

 Sensitivity frequency range
Click image to enlarge


 Description

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.


  Models, Options, & Accessories


Model Description List Price Sale Price
1232-9701 1232-A Tuned Amplifier & Null Detector - Discontinued - no replacement
1232-9829 Please call or email us for pricing and availability.


  Specifications

Frequency

Tunable filters: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 filter on two highest ranges reduces 60 Hz level to at least 60 dB below peak response (50 Hz level is down >50 dB). Dial accuracy is ±3%.
Fixed-Tunable Filters: 50 kHz, 2-nd harmonic is 44 dB down; 100kHz, 2-nd harmonic is 53 dB down
Flat Response: ±3 dB from 20 Hz to 100 kHz.

Sensitivity See chart above. Typically better than 0.1 µS over most of the frequency range
Noise Level Referred to input: See chart above. Noise at 1 kHz < 2 dB at optimum source impedance of 27 kΩ.
Referred to output: < 5 mV on FLAT filter-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; varies 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, flat 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 differences 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 affect bottom 20% of scale.
Attenuation: (meter switched to - 20 dB). Linear response with 20 dB less gain than MAX SENS.
Distortion (filter switched in FLAT position): <5 % (due to meter rectifiers)
Terminals Input: 874 Coaxial Connector.
Output: binding posts.
Available 1232-P2 Preamplifier to maintain sensitivity of 1232-A at low frequencies when operating from a source impedance above 100 kΩ.
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.


   
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