AEMC 1250N 1000V Megohmmeter

Sorry, this product is discontinued and is no longer available for purchase. Please call 1-877-766-5412 to find a suitable replacement.AEMC 6503 1000V MegOhmMeter (2126.52) is a suggested replacement model.

The AEMC 1250N 1000V Megohmmeter is a compact, self-contained, hand-cranked True Megohmmeter.  This practical and dependable instrument is designed for a broad range of plant and field service applications, such as acceptance testing and preventive maintenance of wiring, cables, switchgear and motors.

The easy hand-cranked operation provides a steady, DC voltage output across the entire range for consistently reliable readings.  The AEMC 1250N 1000V Megohmmeter has three test voltages for insulation resistance testing: 250V, 500V and 1000V.  Test voltages are generated in full across the entire measurement range.

The AEMC 1250N Megohmmeter incorporates a built-in, sealed alternator and constant DC voltage circuit to provide a very stable resistance reading.  The megohmmeter is ruggedly built, with a safety-yellow cast aluminum case, aluminum lid and polycarbonate front panel.  The AEMC 1250N Megohmmeter is designed for harsh, heavy-duty use.  An O-ring seal between the front panel and case protects the unit against water and dust.  The crank folds against the unit for storage.

This analog instrument has a unique auto-ranging feature which expands the scale ten times: when the pointer reaches near the end of scale, the auto-ranging feature activates, returning the pointer to the beginning of the scale with the x10 red LED indicator on.  Insulation resistance is indicated with a rugged taut-band meter movement on a logarithmic scale.  The indicator scale is large and easy-to-read, and has direct-reading on all ranges.  A green LED on the front panel illuminates when the proper crank speed is attained, indicating the presence of the selected output.

The AEMC 1250N 1000V Megohmmeter has four terminals including a guard terminal and an instrument ground terminal for user safety.


  • Acceptance testing and preventive maintenance
  • Test motors, cables, switchgears and electrical wiring installations
  • Continuity checks
  • Check domestic and industrial contracting

What's Included:

  • Carrying strap with lead pouch
  • Three color-coded leads
  • Ground lead
  • Two alligator clips
  • Test probe
  • And user manual

The Good:

The Bad:

The Bottom Line:

Full Review

  • True Megohmmeter
  • Test voltages of 250V, 500V and 1000V
  • Insulation measurements to 5000MΩ
  • LED indicates constant voltage output and proper cranked speed
  • Automatic discharge when measurement is finished
  • Auto-Ranging dual scale operation for better sensitivity and easier readings
  • Designed for harsh environments:  marine, mining, heavy-duty field, industrial and military use
  • Extra rugged cast aluminum case, O-ring sealed against rain, water and dust; aluminum lid
  • Compact, self-contained package; folding crank
  • Large direct-reading scale
  • Double Insulation
  • CE Mark
Power Source: Hand-cranked, heavy duty brushless alternator and solid state rectification and amplification for stable voltage; test voltage reached at 140rpm (approx)

Test Voltage 250V: 11 to 11MΩ; 111 to 500MΩ
(Auto-Ranging) 500V: 11 to 11MΩ; 111 to 500MΩ
1000V: 10 to 110MΩ; 110 to 5000MΩ
Short Circuit Current: 5mA (approx)
Accuracy: 2% of Full Scale Length
Automatic Discharge: 8s/μF
Charging Time 250V: 0.2s/μF
500V: 0.5s/μF
1000V: 0.5s/μF

Scale: Direct reading on MΩ and voltage scales; 3" (76mm), black on white
Test Voltage Indicator: Green LED indicates proper test voltage and crank speed
Auto-Range Indicator: Red LED indicates Auto-Range; multiply MΩ readings x 10
Dielectric Test: 2000V, 50/60Hz, between (), (+), and ground terminals
Meter Movement: Rugged taut band suspension
Dimensions: 4.7 x 4.7 x 5.1" (120 x 120 x 130mm)
Weight: 3.3 lbs (1.5kg)
Case: Cast aluminum alloy case and lid painted safety-yellow, with heavy duty gray polycarbonate front panel; O-ring seal between front panel and case; sealed against water and dust; folding crank
Terminals: Guard + Line (red); - earth (black); guard (blue), and ground; accept standard 4mm banana plugs or spade lugs

Safety Rating: EN 61010-1, 600V, Cat. II; 1000V, Cat. I
Double Insulation: Yes
CE Mark: Yes
No user reviews available.
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