332A Agilent Distortion Analyzer


The 332A is a 600 kHz distortion analyzer from Agilent. People use distortion analyzers for the measurement of alternating current (AC) voltages and distortion. Audio distortion analyzers test equipment for their total harmonic content of sinewaves, expressing the measurement as total harmonic distortion (THD).

Additional Features:

  • Distortion measurement range: any fundamental frequency, 5 Hz to 600 kHz
  • Distortion levels of 0.1%-100% are measured full scale in 7 ranges
  • Elimination characteristics: Fundamental rejection > 80 dB. Second harmonic accuracy for a fundamental of 5 to 20 Hz; better than +1 dB; 20 Hz to 20 kHz: better than ±0.6 dB; 20 kHz to 100 kHz: better than -1 dB; 100 kHz to 300 kHz: better than -2 dB; 300 kHz to 600 kHz: better than -3 dB
  • Distortion introduced by instrument: >-70 dB (0.03%) from 5 Hz to 200 kHz; 64 dB (0.6%) from 200 kHz to 600 kHz. Meter indication is proportional to average value of a sine wave
  • Frequency calibration accuracy: better than ±5% from 5 Hz to 300 kHz. Better than ±10% from 300 to 600 kHz
  • Input Impedance: distortion mode; 1 MΩ ±5% Shunted by <70pF (10 MΩ shunted by <10 pF with HP 10001A 10;1 divider probe
  • Voltmeter mode: 1MΩ ±5% shunted by <35 pF 1 to 300 V rms; 1 MΩ ±5 % shunted by <70 pF, 300 µV to 0.3 V rms
  • Input level for distortion measurements: 0.3 V rms for 100% set level or 0.245 V for 0 dB set level (up to 300 V may be attenuated to set level reference)
  • DC Isolation: signal ground may be +/- 400 V dc from external chassis
  • Voltmeter range: 300 µV to 300 V rms full scale (13 ranges) 10 dB per range
  • Noise measurements: voltmeter residual noise on the 300 µV range: <25 µV rms, when terminated in 600 (shielded) ohms, <30 µV rms terminated with a shielded 100Ω resistor
  • Output: 0.1 ±0.01 V rms open circuit and 0.05 ±0.005 V rms into 2 kΩ for full scale meter deflection
  • Output Impedance: 2 kΩ
  • Power supply: 115 or 230 V ±10%, 50 to 66 Hz, approximately 4 VA
  • AM Detector: high impedance DC restoring peak detector with semi-conductor diode operates from 550 kHz to greater than 65 MHz. Broadband input, no tuning is required
  • Maximum input: 40 V p-p AC or 40 V peak transient
  • Distortion introduced by detector: carrier frequency: 550 kHz-1.6 MHz: <50 Db (0.3%) for 3-8 V rms carriers modulated 30%. 1.6MHz-65 MHz: <40 dB (1%) for 3-8 V rms carriers modulated 30%

The Agilent 332A Distortion Analyzer is a solid-state instrument for measuring distortion and ac voltages. The 332A includes a high impedance AM detector which operates from 550 kHz to greater than 65 MHz. Distortion levels of 0.1% to 100% full scale are measured in seven ranges for any fundamental frequency from 5 Hz to 600 kHz.; harmonics are indicated up to 3 MHz. The high sensitivity of these instruments requires only 0.3 V rms for the 100% set level reference. An output is provided at the OUTPUT connectors for monitoring the distortion with an oscilloscope, a true rms voltmeter, or a wave analyzer. The instruments are capable of a dc isolation voltage of 400 volts above chassis ground.

The transistorized voltmeter contained in the 332A can be used separately for general purpose voltage and gain measurements. The voltmeter has a frequency range of 5 Hz to 3 MHz (20 Hz to 500 kHz for 300 µV range) and a voltage range of 300 µV to 300V rms full scale.

The AM detector included in the 332A is a broadband dc restoring peak detector consisting of a semiconductor diode and filter circuit. AM distortion levels as low as 0.3% can be measured on a 3 V to 8 V rms carrier modulated 30% in the standard broadcast band, and lower than 1% distortion can be measured at the same level of the carrier up to 65 MHz.

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