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Extech
Extech 382357 Clamp-On Ground Resistance Tester
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Clamp ground 0.025–1500 Ω; leakage to 30 A; 116 log. RFQ + selection help.
Download datasheet PDF
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Key parameters
Measuring range
Ground resistance 0.025–1500 Ω (autoranging); True RMS AC leakage current 0.300 mA–30.00 A
Accuracy
Ground resistance from ±(1.5% + 0.05 Ω) on low ranges to ±20% on 600.1–1500 Ω; leakage current typically ±(2.0% + offset) per range
Supply
9 V battery
Display
9999-count LCD
Resolution
Ground resistance down to 0.002 Ω on lowest range; leakage current down to 0.001 mA
Measure Frequency
Resistance test frequency 1.667 kHz
Fits clamp-on ground surveys without auxiliary spikes where you need an Extech 382357 covering 0.025–1500 Ω with True-RMS leakage to 30 A, Hi/Lo alarms, and 116-point logging.
Key advantages
- Resistance — 0.025 to 1500 Ω autoranging
- Low-band accuracy — ±(1.5% + 0.05 Ω) class
- Leakage — True-RMS AC 0.2 mA to 30 A class
- Jaw — ~0.9 in (23 mm)
- Memory / alarms — 116 records; programmable Hi/Lo; check plate included
Typical applications
- Multi-point ground clamp surveys.
- Leakage current troubleshooting.
- Spike-free ground checks on bonded systems.
Selection guide
- Jaw OD — Rod/conductor size
- Logging — 116-point need
- Vs stake tester — Multi-grounded systems
- Noise detect — Feature awareness
Common mistakes
- Single-point grounds without return path.
- Dirty jaw mating surfaces.
- Ignoring NOISE indication.
When to RFQ / what to tell us
- Accessories; quantity; ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 31305 |
| Brand | Extech |
| Model | 382357 |
| Product type | Clamp-on Ground Resistance Tester |
| Type | Clamp-on ground resistance tester |
| Resistance range | 0.025 to 1500 Ω autoranging |
| Accuracy (low) | ±(1.5% + 0.05 Ω) on lowest bands |
| Leakage current | True-RMS AC leakage 0.2 mA to 30 A class |
| Jaw | ~0.9 in (23 mm) jaw |
| Memory | 116 records; programmable Hi/Lo alarm |
| Safety | CAT III 300 V / CAT II 600 V |
| Power | 1× 9 V; check plate and case included |
Documents
FAQ
Q: Range? A: 0.025 to 1500 Ω.
Q: Leakage? A: True-RMS AC leakage to about 30 A.
Q: What should I send for a quote? A: Accessories, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Measuring range | Ground resistance 0.025–1500 Ω (autoranging); True RMS AC leakage current 0.300 mA–30.00 A |
| Accuracy | Ground resistance from ±(1.5% + 0.05 Ω) on low ranges to ±20% on 600.1–1500 Ω; leakage current typically ±(2.0% + offset) per range |
| Supply | 9 V battery |
| Display | 9999-count LCD |
| Resolution | Ground resistance down to 0.002 Ω on lowest range; leakage current down to 0.001 mA |
| Measure Frequency | Resistance test frequency 1.667 kHz |
| Functions | 116-point programmable datalogging; Hi/Lo alarm; electrical noise detection; automatic self-calibration; data hold; verification resistors |
| Jaw Size | 0.9 in (23 mm) |
| Dimensions | 10.2 × 4.4 × 1.9 in (258 × 110 × 47 mm) |
| Weight | 24.7 oz (700 g) |