The user manual of UT620 series introduces the features and characteristics of UT621 single-channel and UT622 dual-channel AC millivolt meters, including the measurement voltage range, frequency range, voltage error, and frequency response error under reference conditions.
The UT620 series includes the single‑channel UT621 and dual‑channel UT622 AC millivolt meters. Both models feature two‑pointer dials, selectable ranges, and a differential display, making them suitable for laboratory, factory and research applications such as stereo audio testing.
The manual covers safety precautions, step‑by‑step operation, maintenance procedures, and troubleshooting. It also lists the accessories supplied with the instrument and provides the warranty terms offered by UNI‑T. This manual is written in Chinese.
| Measurement voltage range | 100 µV – 300 V |
|---|---|
| Number of channels | UT621 – single channel; UT622 – dual channel |
| Frequency range | 10 Hz – 2 MHz |
| Input impedance | ≥2 MΩ, ≤50 pF (1 mV‑300 mV); ≥2 MΩ, ≤20 pF (1 V‑300 V) |
| Power consumption | ≈5 W |
It can measure voltages from 100 µV up to 300 V.
The UT622 is a dual‑channel AC millivolt meter.
Check the enclosure for damage, do not use if damaged, ensure proper grounding, and follow the safety section of the manual.
For the 1 mV‑300 mV range the input resistance is ≥2 MΩ with ≤50 pF capacitance; for the 1 V‑300 V range the resistance is also ≥2 MΩ with ≤20 pF capacitance.