Working At Low Temperatures; Kelvin Clamp/Probe Practice; Save Test Results; Hold Present Test Result - Megger MOM2 Win User Manual

SET / I min position you select the minimum current to
be 50 A or 100 A.
Min current guarantee
(I > I min)
Suitable for test objects ≤ 2 mΩ Recommended for test objects
Capacitor only charged to
sufficient level to generate
selected minimum current for
set time
Saves instrument battery
Allows for shorter time
between tests
Note If you get varying measurement results using
the I > I min position, change to I = I max.

Working at low temperatures

MOM2 can be operated down to -20°C provided that
the batteries keep a temperature over 0°C. When the
instrument is in use the batteries will generate heat
enough to keep themselves warm.

Kelvin Clamp/Probe practice

Important
To avoid adding unwanted transition
resistances to the measurement result the
Kelvin clamps or Kelvin probes shall be
connected directly to the test object and
not to e.g. a bolt head.
In some cases it might be advisable to use
separate sense cables, forming a conven-
tional four point measurement, in order
to get a more accurate voltage sense.

Save test results

A]
When LOG is activated measurement results
are automatically saved in the memory.
B]
When the log is OFF only the latest value
is stored and only until the performance of a
following measurement, which overwrites the
previous one.

Hold present test result

When the LOG function is activated the measurement
result is shown on the display for about 3 seconds.
After that it is stored in the memory. If you want to
study the result longer you can lock the display view
by doing as follows.
1]
Press shortly the trigger on the Kelvin probe
or the TEST button just after a measurement.
The latest test result is locked and shown on
the display. This is confirmed by a padlock
symbol on the display and an audio signal.
1.800.561.8187
BD0333JE
Max current
(I = I max)
> 2 mΩ
Capacitor is fully charged
Will push as much current
as possible through the test
object for set time. Current is
determined as: I ≈ 2.5 V / [test
object R + 0.01 Ω] A
Requires longer capacitor
recharge times
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2]
To unlock, press shortly the trigger on the
Kelvin probe or the TEST button.

Delete present test result

1]
Press and hold, about 1 s, the trigger on the
Kelvin probe or the TEST button just after a
measurement.
The latest test result is deleted from screen
and log. This is also confirmed by an audio
signal.
Note This is also possible to carry out when the
result is locked on display.

Recalling test results from the log

1]
Saved results can be recalled by scrolling to
desired label using the ▲ ▼ keys.

Delete results in the log

1]
Select label using the ▲ ▼ ◀ ▶ keys.
2]
By pressing the C key the display will prompt
"CLR" in big characters.
3]
Delete by pressing the OK key. Cancel can be
done by pressing the C key.
Note
In Circuit breaker testing mode the measure-
ment results will be deleted one at a time.

Delete all results in the log

1]
Press and hold, for 5 s, the red button below
the TEST button.
Note This will delete the log memory for both log
modes, Circuit breaker testing and Running
numbers.
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5 OPERATING INSTRUCTIONS
23
MOM2