ZQ4120 Synchronous Distortion MeterDetailed product description：

The ZQ4120 synchronous distortion meter is an electronic measuring instrument that uses integrated circuits. It has the characteristics of high testing accuracy, small signal source distortion, 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 ultra-low distortion signal generator and 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, as well as the built-in audio oscillator, its frequency is synchronized with the distortion meter, making the measurement of gain and loss accuracy much simpler. Suitable for departments such as scientific research, production, communication, education, maintenance, and all occasions where distortion meters are needed.

Main technical performance of ZQ4120 synchronous distortion meter

Distortion measurement
Measurement frequency range: 10Hz-109kHz divided into four frequency bands
Distortion measurement range: a. 20Hz-20kHz 0.01% -30% b. 10Hz-109kHz 0.03% -30%
Distortion measurement error:
a. 300Hz-5kHz not exceeding ± 7% ± 0.01% of the full-scale value
b. 20Hz-20kHz not exceeding ± 10% ± 0.015% of the full-scale value
c. 10Hz-109kHz, not exceeding ± 30% ± 0.025% of the full-scale value
Internal distortion introduced: 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-100V divided into eleven ranges.
(When measuring voltages between 100 and 300V, an additional attenuator accessory is required)
Basic error of voltage measurement: not greater than ± 5% of the full-scale value (1kHz)
Voltage frequency additional error: a. 20Hz-50kHz: not greater than 0.5dB b. 5Hz-300kHz: not greater than 1dB
Voltage noise floor: not greater than 50 μ V
Maximum measurable signal-to-noise ratio: 110dB

oscillator

Oscillation frequency: 10Hz-109kHz
Frequency indication error: not greater than 0.05f ± 1Hz
Nonlinear distortion: a. 300Hz-5kHz: not greater than 0.005% b. 20Hz-20kHz: not greater than 0.015% c. 10Hz-109kHz: not greater than 0.07%
Maximum output voltage: greater than 3Vrms (open circuit)
Maximum output voltage frequency non-uniformity: a. 100Hz-10kHz: less than ± 0.5dB b. 10Hz-109kHz: less than ± 1dB
Output impedance: 600 Ω