According to the standard: GB49431-2022 p. e1. Classification and safety protection of audio signal electrical energy source;
1. Overview
This device is a precision level measuring instrument, which has two characteristics: accurate measurement and frequency digital display. Its frequency range is 15Hz 20kHz and the level measurement range is 40dB -110dB (or 100V 3 V). This equipment is combined with the corresponding low-frequency oscillator, and can be used as a measurement of important parameters of various equipment such as wired carrier communication, satellite communication ground station, radio communication terminal equipment, broadcast transmission system, television sound system, electroacoustic equipment and power system.
It can also be used as a signal harmonic analysis in the low frequency range, so it is also called a waveform analyzer.
Second, the main technical parameters
1. Broadband measurement.
Frequency range: 15Hz 20kHz
Measuring range: -80dB 40dB (10dB conversion per step) or 100 V 100V
Minimum measurable level (voltage): 90dB (30 V).
2. Frequency selection measurement.
Frequency range: 30Hz 20kHz
Measuring range: -80dB 40dB (10dB conversion per step) or 100 V 100V
Minimum measurable level (voltage): 90dB (30 V).
Frequency error: 2 10-5 8hz
Frequency resolution: 1Hz
3. Zero level error: 0. after level correction2db
4. Level switch shift error: 02db
5. Meter scale error: 06db
6. Input balance attenuation: 40db
7. Input impedance: balance 600 5%.
High impedance 10k
8. Frequency response.
Broadband 15hz 20khz 04db
20hz～20khz±0.2db
Frequency selectivity: 60hz 20khz 02db
9. Noise in the machine.
Broadband: 100db
Frequency selection: 100dB (50Hz AC power supply is allowed to cause interference noise caused by the second and third harmonics -110dB).
10. Frequency selectivity: 30Hz 20kHz, 60Hz 20kHz
Passband width: a=3db narrowband 6hz wideband 20hz
Stop band width: A 50dB narrowband FM 50Hz
A 40dB wideband FM 50Hz
11. Residual distortion.
60Hz 200Hz: When the sensitivity is increased by 40dB, the second and third harmonics attenuate by 50dB
200Hz 20kHz: When the sensitivity is increased by 50dB, the second and third harmonics attenuate 60dB
12. Level stability.
After the instrument is warmed up for 30 minutes, the level changes for 3 hours of continuous operation:
Corrected 02db
13. When the AC power supply changes by 10% at 50Hz 220V, the level changes by 01db
14. Coordinate the system.
Frequency range: f+100kHz
Level: Approx. -8dB 10dB 75
Additional error between unified and non-unified modulation: 04db
15. Dimensions: 440mm 360mm 144mm
16. Mass: about 13kg
17. Power consumption: about 12W