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
