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Model SMG5

MEGOHMMETER

Description

The SMG5 Megohmmeter is for fast, easy, and

safe testing of insulation resistance. It provides
1000V voltage source, monitors current, and
displays the resistance between the test points.
Maximum current output is <1.5mA. To extend
battery life, it automatically turns itself off in 15
seconds.

Applications

The SMG5 can be used to determine the

condition of insulation from winding to ground in
a motor, compressor, or transformer. 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. Make sure that all measurements are
compared to readings at the same temperature.
Insulation resistance can vary dramatically with
temperature.

Megohm readings can work best when the

same equipment is measured over time.
Decreasing insulation resistance levels can
forecast failure before catastrophic failure.

For your safety...

1. Connect the E terminal to ground using

the alligator clip (included).

2. Use one hand to conduct test.
3. 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.

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 "  " 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:

 <10

μ

A

Battery:

4 pcs 1.5V (AAA size) UM-4 R03.

Battery Life:

4 hours (continuity) typical with alkaline

battery (@20

ΜΩ

 range test 10

ΜΩ

resistor).

Insulation Resistance
Measurement Terminal
Voltage

Terminal voltage(V)

Rx(

Ω

Ω

Ω

Ω

Ω

  )

Dimensions:

170mm(H) x 44mm(W) x 40mm(D).

Weight:

 160g  including batteries.

ELECTRICAL
Range:

 20

ΜΩ

,2000

ΜΩ

.

Resolution:

 10K

Ω

 on 20

ΜΩ

 range.

                  1

ΜΩ

 on 2000

ΜΩ

 range.

Accuracy:

20

ΜΩ

 range: ±(2%rdg + 2dgts)

2000

ΜΩ

 range: <500

ΜΩ 

±(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 (<18°C or >28°C)

 WARNING

Remove power from circuit under test.

 WARNING

To avoid electrical shock remove test

leads before opening case or battery cover.

Do not operate with battery cover open.

International Electrical Symbols

SEE EXPLANATION
IN MANUAL

GROUND

DOUBLE INSULATION
(Protection ClassII)

DC-DIRECT
CURRENT

AC-ALTERNATING
CURRENT

DANGEROUS
VOLTAGE

 WARNING

Do not measure when compressor

motor is in a vacuum.

 WARNING

Do not touch test lead tips, test points,

or terminals when pressing MEAS.

HOLD

OPERATOR'S MANUAL

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