Hewlett Packard HP 334A Distortion Analyzer

Description

The HP 334A distortion analyzer is a solid state instrument for measuring distortion on ac voltages. It measures total distortion down to 0.1% full scale at any fundamental frequency between 5 Hz and 600 kHz. The 334A includes two control loops that automatically tune both legs of a bridge circuit that rejects the fundamental when the rejection circuit is initially set within the range of the loops. Harmonics are indicated up to 3 MHz. The distortion characteristics can be monitored at the OUTPUT connectors with an oscilloscope, a TRMS voltmeter, or a wave analyzer. Noise levels as low as 25 µV can be measured. The voltmeter inside the 334A can be used separately for general purpose voltage and gain measurements. The 334A includes automatic fundamental nulling and amplitude modulation detection. The 334A RF detector is untuned and accepts RF signals >1 V within a range of 550 kHz to 65 MHz. In the broadcast band (550 to 1600 kHz), the detector introduces less than 0.3% distortion into signals carried on 3-8 Vrms carriers modulated 30%. Distortion measurement range: 5 Hz to 600 kHz Distortion measurement accuracy: Distortion levels of 0.1% to 100% full scale are measured in seven ranges for frequencies of 5 Hz to 600 kHz Frequency calibration accuracy: Better than ±5% from 5 Hz to 300 kHz; better than ±10% from 300 kHz to 600 kHz Input impedance: 1 MΩ Input level for distortion measurements: 0.3 Vrms for 100% set level (up to 300 V may be attenuated to set level reference) DC isolation: Signal ground can be ±400 Vdc from external chassis Voltmeter range: 300 µV to 300 Vrms full scale (13 ranges) 10 dB per range Voltmeter accuracy: ±2%, ±5% depending on voltage range and frequency Voltmeter frequency range: 5 Hz to 3 MHz Voltmeter residual noise measurements: <25 µVrms or <30 µVrms depending on termination Output: For input frequencies from 20 Hz to 600 kHz – 0.1 Vrms ±0.01 V open circuit for full scale meter deflection; 0.05 Vrms ±0.005 V into 2 kΩ for full scale meter deflection Automatic nulling mode: Set level – at least 0.2 Vrms Automatic null accuracy: 5 Hz to 100 Hz: Meter reading within 0 to +3 dB of manual null 100 Hz to 600 kHz: Meter reading within 0 to +1.5 dB of manual null High-pass filter: 3 dB point at 400 Hz with 18 dB per octave roll off Amplitude Modulation detector: High impedance dc restoring peak detector with semi-conductor diode operates from 550 kHz to greater than 65 MHz – no tuning required. Broadband input, maximum input, 40 Vp-p ac or 40 V transient Carrier frequency: 550 kHz to 1.6 MHz: Distortion introduced by detector is <0.3% for 3 to 8 volt carriers modulated 30% 1.6 MHz to 65 MHz: Distortion introduced by detector is <1% for 3 to 8 volts rms carriers modulated 30% Option 01 meter with VU characteristics meets FCC requirements for AM, FM, and TV broadcasting