Display Features; Operation; Specification - Megger BM121 Gebrauchsanleitung

Insulation & continuity testers

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Fuse

Ruptured

When briefly pressed and released, the instrument's single control button

switches the instrument 'O n'and selects C o n t i n u i t y mode. The Continuity test

automatically activates when the test leads make contact. Pressing and holding

the button selects I n s u l a t i o n m o d e .

Refer to Safety Warnings before using the instrument

Preliminary Test lead check

Before each use of the instrument, visually inspect the test leads to

confirm that their condition is good, with no damaged or broken

insulation.

Check continuity of the test leads by firmly shorting the leads together

and read the test lead resistance measurement directly from the

display.

Continuity Te s t i n g

Turn the instrument ' O n ' by briefly pressing and releasing the test button.

Firmly connect the test leads together and note their combined

resistance value.

3 .

Connect the test leads across the circuit under test.

4 .

Take

the

r a n g e . ( M a x . 9 9 , 9 Ω ) .

5 .

Subtract the test lead resistance value from the measured reading.

Insulation Te s t i n g

1 .

Turn the instrument ' O n ' by briefly pressing and releasing the test button

2 .

Firmly connect the test leads to the isolated item / circuit under test.

3 .

Press and hold the test button; the display changes to the M r a n g e

and shows the insulation value. As an additional safety feature the

BM122 display flashes its ' 1 0 0 0 V ' symbol before performing the test.

4 .

Release the test button beforeremoving the test leads (to enable the

instrument to discharge the circuit under test).

I N S U L ATION

Nominal Test Vo l t a g e :

Test Voltage Accuracy:

Measuring Range:

Short Cct. Current:

Accuracy (at 20°C):

CONTINUITY

Measuring Range:

Open Cct. Voltage: