Kyoritsu KEW 3025A Digital Hight Voltage Insulation Tester
The Kyoritsu KEW 3025A is a rugged, digital high-voltage insulation tester designed for field and laboratory use. It generates selectable DC test voltages (250 V, 500 V, 1 kV, 2.5 kV) to measure insulation resistance up to 100 GΩ, ideal for verifying the integrity of motors, transformers, cables, and switchgear. A built-in voltage monitor lets you confirm the presence or safe discharge of stored charge on the equipment under test.
Advanced diagnostics include automatic calculation of Dielectric Absorption Ratio (DAR) and Polarization Index (PI), assisting in moisture and contamination analysis of insulating materials. The 3025A’s large LCD, with 36-segment bar graph and backlight, provides clear readings even in dim environments. To protect users, it features live-circuit warning (audio/visual), auto-discharge of capacitances post-test, and meets IEC 61010-1 CAT IV 300 V/CAT III 600 V safety standards. Auto-power-off conserves battery life, while its hard-carrying case and ergonomic layout make it transport-ready.
Powered by eight C-size cells and backed by optional recorder and alligator-clip accessories, the KEW 3025A combines precision, safety, and convenience for maintenance engineers and testers of critical electrical infrastructure.
Features:
- Four selectable DC test voltages: 250 V, 500 V, 1 kV, 2.5 kV.
- Insulation resistance measurement up to 100 GΩ.
- Automatic DAR (15 s/30 s) and PI (1 min/10 min) calculation.
- Auto-discharge of capacitive loads with voltage-monitor display.
- Live-circuit warning (≥ 30 V) with audible buzzer and on-screen indicator.
- Backlit 630-count LCD plus 36-segment bar graph for trend indication.
- Auto-power-off after 10 min of inactivity.
- Conforms to IEC 61010-1, -2-030 (CAT IV 300 V/CAT III 600 V), IEC 61010-031, IEC 61326-1 EMC, IP40.
Specifications:
| Parameter | KEW 3025A Details |
|---|---|
| Test Voltages (DC): | 250 V, 500 V, 1 kV, 2.5 kV |
| Insulation Resistance Ranges: | 0.0 – 99.9 MΩ / 80 – 999 MΩ / 0.80 – 9.99 GΩ / 8.0 – 99.9 GΩ |
| Accuracy (Resistance): | ±5 % rdg ± 3 dgt |
| Voltage Monitor: | 30 – 3 000 V DC (±10 % rdg ± 20 V), resolution 10 V |
| Voltage Measurement: | DC ±30 – ±600 V, AC 30 – 600 V (±2 % rdg ± 3 dgt) |
| Display: | 630-count LCD, 36-segment bar graph, DAR/PI, timer, backlight |
| Test Current: | ≥ 1 mA, ≤ 1.2 mA (at rated load) |
| Short-Circuit Current: | 1.5 mA ± 0.5 mA |
| Safety Standards: | IEC 61010-1 CAT IV 300 V / CAT III 600 V, IEC 61010-031, IEC 61326-1 EMC, IP40 |
| Power: | DC 12 V (8× C-size cells), ~25–80 h operation depending on range |
| Dimensions & Weight: | 177 × 226 × 100 mm; 1.7 kg (incl. batteries) |
Applications:
- Mains Disconnection Check (Voltage Measurement).
- Insulation Resistance Measurement.
- Continuous Insulation Monitoring.
- DAR/PI Diagnostic Testing.
- Guard-Terminal Surface Leakage Elimination.
Package Contents:
- 1× KEW 3025A insulation tester main unit
- 1× Line probe (MODEL 7165A, 3 m)
- 1× Earth cord (MODEL 7264, 3 m)
- 1× Guard cord (MODEL 7265, 3 m)
- 1× Hook-type probe (MODEL 8019)
- 1× Hard carrying case (MODEL 9180)
- 8× LR14 (C-size) batteries (installed)
- 1× Instruction manual
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