The Tonghui TH2683A insulation resistance meter offers 100 kΩ-10 TΩ range, 1-1000 V test voltage, 30 ms fast measurement, 4-wire touch LCD and firmware updates via USB.
Description
The Tonghui TH2683 series are high-precision insulation resistance and leakage current measuring devices with 4-wire touch LCD (4.3″, 24-bit, 480×272), which cover voltage ranges from 1-1000 V (TH2683A) resp. 1-500 V (TH2683B) and measure resistances up to the teraohm range. Fast test cycles (30 ms) and extensive memory and automation functions make them ideal for production lines and laboratory applications.Features
- Test voltage range: 1-1000 V (TH2683A), 1-500 V (TH2683B)
- Insulation resistance test range: 100 kΩ-10 TΩ
- Dual display for insulation resistance and leakage current
- 24-bit LCD touchscreen (4.3 inch, 4-wire)
- LCD resolution: 480 x 272 pixels
- Zero cancellation function
- Contact detection for capacitive components
- Quick test: 30 ms
- Programmable sequence test mode
- 6 measuring ranges, manual or automatic measuring range mode
- 4-range comparison function: 3 ranges for "pass", 1 range for "fail"
- 20 setup files can be saved in the internal memory (USB stick support)
- Measurement data can be saved to USB stick
- Automatic firmware update via USB stick
- Selectable Chinese and English user interface
- Online operation via the user interface
- Remote control via RS232C and USB device interface
- Foot switch trigger function
Applications
- Testing of ultra-high resistance and insulation materials
- Leakage current and insulation measurement on capacitors
- Quality assurance of cables, wires and electronic components
- Compliance with safety standards (insulation tests)
- Automated inline test systems with handler interface
Technical Data
| Model | ![]() TH2683A | ![]() TH2683B |
|---|---|---|
| Insulation resistance range | 100 kΩ - 10 TΩ | 100 kΩ - 5 TΩ |
| Resistance measurement accuracy | I > 10 nA: ± 2 %; I ≤ 10 nA: ± 5 % | I > 10 nA: ± 2 %; I ≤ 10 nA: ± 5 % |
| Leakage current ranges | 1: 100 µA - 1 mA (10 kΩ) 2: 10 µA - 100 µA (10 kΩ) 3: 1 µA - 10 µA (10 kΩ) 4: 100 nA - 1 µA (10 kΩ) 5: 10 nA - 100 nA (1 MΩ) 6: 1 nA - 10 nA (1 MΩ) | 1: 100 µA - 1 mA (10 kΩ) 2: 10 µA - 100 µA (10 kΩ) 3: 1 µA - 10 µA (10 kΩ) 4: 100 nA - 1 µA (10 kΩ) 5: 10 nA - 100 nA (1 MΩ) 6: 1 nA - 10 nA (1 MΩ) |
| Leakage current accuracy | ± 2 % ± 3 pA | ± 2 % ± 3 pA |
| Test voltage | 1 V - 1000 V | 1 V - 500 V |
| Voltage accuracy | ≥ 10 V: ± 1 % ± 1 V; < 10 V: ± 10 % ± 0.1 V | ≥ 10 V: ± 1 % ± 1 V; < 10 V: ± 10 % ± 0.1 V |
| Current limitation | 10 mA | 10 mA |
| Measuring speed | Fast ≤ 30 ms; Slow ≤ 60 ms | Fast ≤ 30 ms; Slow ≤ 60 ms |
| Comparator | 4 bins (3× PASS, 1× FAIL) | 4 bins (3× PASS, 1× FAIL) |
| Ranging modes | Auto, Hold | Auto, Hold |
| Memory | Internal + external USB disc | Internal + external USB disc |
| Interfaces | RS232,, USB host, USB device, handler | RS232, USB host, USB device, handler |
| Dimensions (W × H × D) | 235 × 105 × 360 mm (rack: 215 × 88 × 335 mm) | 235 × 105 × 360 mm (rack: 215 × 88 × 335 mm) |
| Weight | 3.6 kg | 3.6 kg |










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