ZQ4121A Automatic Distortion MeterDetailed product description：

ZQ4121A automatic distortion meter is an electronic measuring instrument that uses integrated circuits. It has the advantages of high testing accuracy, small size and light weight, easy operation, and reliable performance.
This instrument is mainly used to measure the nonlinear distortion of audio signals and various audio devices, and can also be used as an audio voltmeter. And it can test the signal-to-noise ratio and frequency characteristics of amplifiers and various audio devices.

Due to the automatic level calibration and frequency tracking devices of the instrument, the measurement of gain and loss accuracy is greatly simplified. Even signals containing amplitude modulation or frequency jitter components can be easily and stably tested for distortion. Suitable for departments such as scientific research, production, communication, education, maintenance, and all occasions where distortion meters are needed.

Main technical performance

Distortion measurement

Measurement frequency range: 10Hz-109kHz
Distortion measurement range: a. 20Hz-20kHz 0.01% -30% b. 10Hz-109kHz 0.03% -30%
Distortion measurement error: a. 300Hz-5kHz not greater than ± 7% ± 0.01% of the full-scale value. b. 20Hz-20kHz not greater than ± 10% ± 0.015% of the full-scale value
c. 10Hz-109kHz, not exceeding ± 15% ± 0.025% of the full-scale value
Distortion introduced into the machine: a. 300Hz-5kHz not exceeding 0.015% b. 20Hz-20kHz not exceeding 0.025% c. 10Hz-109kHz not exceeding 0.035%
Automatic adjustment range of input voltage: greater than 10dB
Minimum detectable voltage for distortion: 100mV
Distortion meter input impedance: 100k Ω± 2%, input capacitance not exceeding 100pF

voltage measurement

Voltage measurement range: 300 μ V-300V
Basic error of voltage measurement: not greater than ± 5% of the full-scale value (1kHz)
Voltage frequency additional error:
Input range switch below 100V: a. 20Hz-50kHz not exceeding 0.5dB b. 5Hz-300kHz not exceeding 1dB
Input range switch 300V: a. 20Hz-20kHz not exceeding 0.5dB b. 10Hz-100kHz not exceeding 1dB
Voltage noise floor: not greater than 50 μ V
Maximum measurable signal-to-noise ratio: 120dB