KYORITSU KEW 3125A High Voltage Insulation Tester
The KYORITSU KEW 3125A High Voltage Insulation Tester is a robust handheld instrument designed for evaluating the insulation integrity of electrical equipment by applying DC test voltages up to 5000 V. It enables maintenance personnel to verify insulation resistance up to the terohm range (up to 1 TΩ on the highest range), making it suitable for heavy-duty diagnostics on cables, switchgear, transformers, motors, and other high-voltage components. The instrument integrates safety features and ergonomic design to support field operations under varied conditions.
The tester offers multiple voltage ranges (250 V, 500 V, 1000 V, 2500 V, and for the 3125A an additional 5000 V range), with autoranging insulation measurement up to 1 TΩ. It incorporates auto-discharge to safely bleed off capacitive charge post-test, a voltage monitor to confirm discharge, and diagnostic functions including Polarization Index (PI) and Dielectric Absorption Ratio (DAR) measurements for deeper insulation condition assessment. A bar graph and digital display with backlight enhance readability, while live-circuit warning (audible/visible) prevents inadvertent testing on energized circuits. Auto-power-off conserves battery life during inactivity.
Ergonomically arranged controls and protective fingerguards facilitate safe handling. The instrument meets IEC safety standards (IEC 61010-1/2-030, CAT IV 300 V/CAT III 600 V) and includes guard terminal support to suppress surface leakage in cable tests. Its sturdy hard case and battery operation (eight LR14 C-cells) allow reliable use in various field environments. Clear guidance in the manual emphasizes precautions (e.g., verifying no residual voltage before connection, using proper probes), ensuring user safety during high-voltage measurements.
Features:
- High-voltage insulation resistance testing with five voltage ranges: 250 V, 500 V, 1000 V, 2500 V, and 5000 V (3125A).
- Insulation resistance measurement up to 1 TΩ on highest range, with autoranging display.
- Auto-discharge function with voltage monitor to ensure safe discharge post-test.
- Backlighted digital display and bar graph indication for clear readings in dim conditions.
- Audible and visible live-circuit warning to prevent testing on energized circuits.
- Auto-power-off after ~10 minutes inactivity to conserve battery.
- Diagnostic PI (Polarization Index) and DAR (Dielectric Absorption Ratio) measurement functions.
- Guard terminal support to eliminate surface leakage in cable insulation tests.
- Protective fingerguard and ergonomic layout for safe handling.
- Meets IEC safety standards (IEC 61010-1/2-030; CAT IV 300 V/CAT III 600 V).
- Battery-powered (8×LR14 C-cells) for portable field operation.
Specifications:
| Parameter | Details |
|---|---|
| Test Voltage Ranges: | DC 250 V, 500 V, 1000 V, 2500 V; additional 5000 V range for KEW3125A |
| Insulation Resistance Ranges: | • 250 V: 0.0–100.0 MΩ; 80–1000 MΩ• 500 V: 0.0–99.9 MΩ; 80–999 MΩ; 0.80–9.99 GΩ• 1000 V: 0.0–99.9 MΩ; 80–999 MΩ; 0.80–9.99 GΩ; 8.0–100.0 GΩ• 2500 V: similar tiered ranges up to 100 GΩ• 5000 V: 0.0–99.9 MΩ; 80–999 MΩ; 0.80–9.99 GΩ; 8.0–99.9 GΩ; 80–1000 GΩ; display up to ~1200 GΩ |
| Accuracy (Insulation): | ±5% of reading ±3 digits on most ranges; for ≥100 GΩ ranges ±20% of reading |
| Open-Circuit Voltage Tolerance: | DC 250 V: +10% / −10%; DC 500 V: +20% / −10%; DC 1000 V: +20% / −0%; DC 2500 V: +20% / −0%; DC 5000 V: +20% / −0% |
| Rated / Short-Circuit Current: | Rated ≥1 mA (e.g., at specified loads: 1.2 mA or less at 5 MΩ load on 5000 V); Short-circuit ~1.5 mA ±0.5 mA |
| Voltage Monitor (Insulation): | 30–6000 V (resolution 10 V); accuracy ±10% of reading ±20 V; used to confirm discharge of stored charge post-test |
| Voltage Measurement Range: | AC: 30–600 V (50/60 Hz); DC: ±30–±600 V; resolution 1 V; accuracy ±2% of reading ±3 digits |
| Display & Indicators: | LCD with backlight; bar graph (36 points); insulation resistance count up to 1200; VAC/DC up to 630 counts; DAR/PI value up to 9.99; timer; low-battery symbol (4 levels); overrange indicated by “OL” (resistance) / “Hi” (voltage) |
| Diagnostic Functions: | Built-in Polarization Index (PI) and Dielectric Absorption Ratio (DAR) measurements (user-selectable intervals 15/30 s) |
| Live-Circuit Warning: | Audible and visible warning if >30 V present before test; prevents inadvertent testing on energized circuits |
| Auto-Discharge: | Yes; automatically discharges capacitive charge after test; confirmed via voltage monitor |
| Backlight & Auto-Power-Off: | Backlight for dim conditions (auto-off after ~60 s unless measuring); auto-power-off after ~10 min inactivity (disabled during measurement or warning) |
| Safety Standards & Protection: | IEC 61010-1 / -2-030; IEC 61010-031 (hand-held probes); IEC 61326-1/-2-2 (EMC); IEC 60529 IP40; EN 50581 RoHS; Measurement categories CAT IV 300 V / CAT III 600 V (depending on probe combination); pollution degree 2; overload protection: insulation range AC1200 V/10 s, voltage range AC720 V/10 s; withstand voltage AC5160 V/5 s between circuit and enclosure |
| Power Source & Battery Life: | DC 12 V from 8 × LR14 (C) alkaline cells; battery life approx. 25 h on 5000 V range at 100 MΩ load |
| Operating Conditions: | Temperature 0–40 °C; humidity ≤85% RH (no condensation); altitude ≤2000 m |
| Storage Conditions: | Temperature −20–+60 °C; humidity ≤75% RH (no condensation) |
| Dimensions & Weight: | Instrument: 177 × 226 × 100 mm; Hard case: 380 × 430 × 154 mm; Weight: KEW3125A approx. 1.9 kg (including batteries); with accessories & case ~4 kg |
| Accessories (Standard): | Line probe MODEL 7165A; Earth cord MODEL 7264; Guard cord MODEL 7265; Hook-type prod MODEL 8019; Hard case MODEL 9181; 8 × LR14 batteries; Instruction manual |
| Optional Accessories: | Alligator-clip line probe MODEL 7168A; Long probe MODEL 7253; Adaptor for recorder MODEL 8302 |
Applications:
- High Voltage Equipment Insulation Testing.
- Transformer Insulation Resistance Measurement.
- Electric Motor Insulation Diagnostics.
- Power Cable Insulation Evaluation.
- Switchgear and Panel Testing.
- Preventive Maintenance in Electrical Installations.
- Field Testing of Electrical Infrastructure.
- Quality Control in Manufacturing or Commissioning.
Package Contents:
- 1x Main instrument unit (KEW 3125A)
- 1x Line probe (MODEL 7165A)
- 1x Earth cord (MODEL 7264)
- 1x Guard cord (MODEL 7265)
- 1x Hook-type probe tip (MODEL 8019)
- 1x Hard case (MODEL 9181)
- 8x Batteries LR14 (C) size
- 1x Instruction manual
Reviews
There are no reviews yet.