Digital Megohm Meter

Digital Megohm Meter - SMG5

What is It?

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.

How Does it Work?

Disconnect the windings and measure the resistance between the windings and ground through the insulation. Determine what a "good" reading is by comparing your reading to values supplied by the manufacturer of the equipment or from your own experience.

Noticing decreasing insulation resistance levels can forecast problems before catastrophic failure.

Why a Digital Multimeter (DMM) Often Isn't Enough
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.

For your safety.

Connect the E terminal to ground using the alligator clip (included).
Use one hand to conduct test.
Make sure to turn meter OFF to avoid accidentally pressing MEAS and creating a 1000V voltage source. If the switch is ON and MEAS is depressed, 1000V will appear on the terminals.

Features and Benefits

Designed for HVAC/R, the Digital Megohm Meter, model SMG5 is a compact, low cost meter for checking compressor insulation.

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

Competitive Advantages

The Fieldpiece Megohm Meter, model SMG5, is in a class of it’s own. It’s affordable and was designed with your safety in mind. When used properly, detachable lead tips and probes along with and alligator lead tip allow for one-handed testing. The compact, slim shape allows for easier testing as well. Auto power off (APO) conserves battery life.

What's Included

Megohm Meter – SMG5
(2) Probe tips
(1) Ground lead with detachable tip
(1) Alligator probe tip
Carrying Case
(4) 1.5V(AAA) batteries (installed)
Operator’s manual

Recommended Accessories and Replacement Parts

Technicians who like the SMG5 may also enjoy these instruments and accessories:

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Specifications

TECHNICAL SPECIFICATIONS
Display: 3 1/2 digit liquid crystal display (LCD) with maximum reading of 1999.
Overrange: (OL) or (-OL) is displayed.
Low battery indication: The battery symbol 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 (@20cΛ range test 10cΛ resistor).
Dimensions: 170mm(H) x 44mm(W) x 40mm(D).
Weight: 160g including batteries.

ELECTRICAL
Range: 20 ΜΩ, 2000 ΜΩ.
Resolution: 10K Ω on 20ΜΩ range, 1 ΜΩ on 2000 ΜΩ range.
Accuracy:
20 ΜΩ range: ±(2%rdg + 2dgts)
2000 ΜΩ range: <500ΜΩ ±(4%rdg + 2dgts)
>500 ΜΩ ±(5%rdg + 2dgts)
Rated voltage: DC-DC converter to 1000VDC
Accuracy temperature: 23°C ± 5°C less than 70%RH
Temperature Coefficient: 0.1X (specified accuracy)/°C (28°C)

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