SMG5 Digital Megohm Meter
SMG5 Digital Megohm Meter

SMG5 - Digital Megohm Meter

Evaluate Compressor Insulation. Helps to Predict Compressor Failure.


Digital Megohm Meter

Evaluate Compressor Insulation. Helps to Predict Compressor Failure.

1000VDC voltage source
Measure up to 2000 megohm
Backlit LCD

The Fieldpiece Digital Megohm Meter, model SMG5, is a compact standalone meter designed for checking HVAC compressor insulation. The SMG5 provides a 1000V voltage source, monitors current, and displays the resistance between the test points. Maximum current output is <1mA. It can be used to determine the condition of insulation from winding to ground in a motor, compressor, or transformer. Includes a case, alligator clip lead tip and leads with removable tips.

To test resistance, a DMM supplies low voltage (<1V) to the test points and is capable of delivering only a few milliamps. It’s not a high enough voltage to detect high resistance problems that might indicate moisture and other contaminants and it’s not enough current to measure lower values of resistance.

  • 1000VDC stresses insulation to measure up to 2000Mohms
  • Backlit LCD display
  • Auto-off to extend battery life
  • Case, alligator clip, leads with removable tips


  • Megohm Meter – SMG5
  • (2) Probe Tips
  • (1) Ground Lead with Detachable Tip
  • (1) Alligator Probe Tip
  • Carrying Case
  • (4) AAA Batteries (installed)
  • Operator’s Manual


  • Display: 3 1/2 digit liquid crystal display (LCD) with maximum reading of 1999
  • Overrange: (OL) or (-OL) is displayed
  • Low battery indication: The ” ” is displayed when the battery voltage drops below the operating level
  • Measurement rate: 2.5 times per second, nominal
  • Operating Environment: 0°C to 40°C at < 70% relative humidity.
  • Storage Temperature: -20°C to 60°C, 0 to 80% R.H. with battery removed from meter
  • Auto power off: 15 seconds approx.
  • Standby consume current: <10μA
  • Battery: 4 pcs 1.5V (AAA size) UM-4 R03.
  • Battery Life: 4 hours (continuity) typical with alkaline battery (@20ΜΩ range test 10ΜΩ resistor).
SMG5 Digital Megohm Meter

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