The Tonghui TH2511 manual explains operation, specifications, and maintenance of the DC low‑resistance tester.
The TH2511 is a direct‑current low‑resistance tester designed for measuring very small resistances in coils, motors, transformer windings, cables, switches, plugs and sockets. It uses a chopper‑stabilized zero‑drift amplifier and a five‑terminal measurement method to improve accuracy and eliminate lead and contact resistance effects.
The manual covers technical specifications, panel layout, measurement ranges, sorting functions, installation, operation, and detailed maintenance procedures, including warm‑up time, test current settings, and calibration checks. This manual is written in Chinese.
| Display resolution | 10 μΩ |
|---|---|
| Measurement range | 10 μΩ – 1.9999 kΩ (five ranges) |
| Measurement error (range 1‑2) | ±0.2 % reading ±4 digits |
| Measurement error (range 3‑5) | ±0.2 % reading ±2 digits |
| Temperature coefficient | ±0.003 % reading ±1 digit per °C |
| Test current (range 1) | ≈250 mA |
| Test current (range 5) | ≈25 µA |
| Warm‑up time | 15 minutes |
| Measurement speed | ≈2 measurements/second |
The instrument can resolve down to 10 μΩ.
It requires a warm‑up time of 15 minutes.