The Model 3131A offers unmatched performance, and feature including test lead resistance zero adjustment for time-saving continuous operation, a clear ease to read illuminated scale, and a live circuit warning.Test insulation up to 100MΩ at 250V, 200MΩ at 500V, 400MΩ at 1000V and continuity up to 20Ω. LIVE circuit warning lamp plus audible warning. Automatic discharge of circuit capacitance when TEST button is released. Fuse protected (continuity range only). Battery check LED. Front panel zero adjust. Back light function to facilitate working at dimly lit situations.
Insulation Resistance
Test Voltage
250V/500V/1000V
Measuring Range (Mid-scale Value)
100MΩ/200MΩ/400MΩ (1MΩ) (2MΩ) (4MΩ)
Output Voltage on open circuit
Rated test voltage+20%, -0%
Nominal Current
1mA DC min.
Output Short Circuit Current
1.3 mA DC approx.
Accuracy
0.1~10MΩ/0.2~20MΩ/0.4~40MΩ (Accuracy Guaranteed Ranges) ±5% of indicated value