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 T 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 T. 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.
| 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: 0.0100.0 M; 801000 M 500 V: 0.099.9 M; 80999 M; 0.809.99 G 1000 V: 0.099.9 M; 80999 M; 0.809.99 G; 8.0100.0 G 2500 V: similar tiered ranges up to 100 G 5000 V: 0.099.9 M; 80999 M; 0.809.99 G; 8.099.9 G; 801000 G; display up to ~1200 G |
| Accuracy (Insulation): | 5% of reading 3 digits on most ranges; for 100 G 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 M load on 5000 V); Short-circuit ~1.5 mA 0.5 mA |
| Voltage Monitor (Insulation): | 306000 V (resolution 10 V); accuracy 10% of reading 20 V; used to confirm discharge of stored charge post-test |
| Voltage Measurement Range: | AC: 30600 V (50/60 Hz); DC: 30600 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 M load |
| Operating Conditions: | Temperature 040 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 |
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