The Saibao Instruments 420B Touch Current Tester User Manual provides safety rules, operation steps, and calibration procedures.
This manual introduces the 420B Touch Current Tester, its principle of operation, and the standards it complies with (GB4943‑2001, GB8898‑2001). It details safety warnings, warranty terms, and required maintenance.
The document explains how to perform power‑on checks, panel functions, measurement procedures, and how to calibrate the test network’s input and conversion impedance across a frequency range of 20 Hz to 1 MHz. This manual is written in Chinese.
| Sensitivity | 5 mV‑10 V per division, accuracy better than ±3 % |
|---|---|
| Maximum Input Power | 250 VAC / 300 W max |
| Calibration Frequency Range | 20 Hz – 1 MHz |
The instrument is covered by a one‑year free repair warranty if faults are due to manufacturing defects and the user has not modified the circuit or parts.
Calibration is performed by applying a standard signal source (20 Hz – 1 MHz) to the test network and measuring the input and conversion impedance with a digital voltmeter, following the procedures in section 7.3.