MODEL 3131A - Analogue Insulation / Continuity Tester

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 100M? at 250V, 200M? at 500V, 400M? at 1000V and continuity up to 20?.
  • 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.
  • PRESS TO TEST button with lock down feature.

Insulation Resistance

Test voltage 250V/500V/1000V
Measuring ranges
(Mid-scale value)
(1M?) / (2M?) / (4M?)
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 - 10M?/0.2 - 20M?/0.4 - 40M?
(Accuracy Guaranteed Ranges) ±5% of indicated value


Measuring ranges
(Mid-scale value)
Output voltage on open circuit 4 - 9V DC
Measuring current 200mA DC min
Accuracy ±3% of scale length


Safety Standard IEC 61010-1 CAT III 300V Pollution Degree 2
IEC 61010-2-031
IEC 61557-1/2/4
IP Rating IEC 60529-IP54
EMC Standard IEC 61326-1
Power source R6 (AA) (1.5V) × 6
Dimensions 167(L) × 185(W) × 89(D)mm
Weight 860g approx.
Included Accessories 7122B (Test leads) Pouch for test leads
8923 (F500mA/600V fuse) × 2
R6 (AA) × 6
9121 (Shoulder Strap)
Instruction Manual

Test Leads

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