User manual for the Tonghui TH2512/TH2512A low‑resistance tester, covering operation, specifications, and remote control features.
The TH2512/TH2512A is an intelligent low‑resistance tester designed to measure resistances from 1 µΩ up to 2 MΩ (TH2512) or 10 µΩ up to 200 kΩ (TH2512A). It offers selectable test speed, high accuracy, dual display modes (resistance or percentage), sorting functions, and IEEE‑488 (GPIB) remote control.
This manual provides safety precautions, detailed descriptions of panel buttons and indicators, step‑by‑step usage instructions, sorting setup, interface signal definitions, system block diagram, calibration procedures, and warranty information. This manual is written in Chinese.
| Measurement Range (TH2512) | 20 mΩ – 2 MΩ |
|---|---|
| Measurement Range (TH2512A) | 200 mΩ – 200 kΩ |
| Accuracy | ±0.05% + 2 digits |
| Open‑circuit Voltage | < 1.0 V (low range) / < 4 V (high range) |
| Temperature Coefficient | 100 ppm (low range) / 50 ppm (others) |
| Power Supply | 220 VAC, 50 Hz |
| Operating Temperature | 0 °C – 40 °C |
| Storage Temperature | -40 °C – +75 °C |
The instrument must be pre‑heated for at least 10 minutes before any measurement.
Press the clear (清零) button; the clear LED lights and the offset is removed.
The IEEE‑488 (GPIB) interface provides full remote control of the instrument.