Megger BMM2000 Series Betriebsanweisung PDF herunterladen (Seite 5)

Continuity Testing (Ω) (See fig.2)

The continuity tests are activated

when the probes make contact of less

than a few kΩ. The tests apply a

constant current and measure the

resulting volt drop across the circuit

under test. The test operates without

the need to press the TEST button.

When the test leads are removed the

reading will hold for a few seconds

and then reset. To recall the last result

press the key. This range is not

suitable for diode testing since the

automatic contact detector will not be

activated when connected to a diode.

1. Set the selector switch to Ω.

2. Connect the test leads.

3. The test will activate automatically.

4. After the test probes are disconnected, the reading will be

held for a few seconds.

Zeroing of Test Lead Resistance

The resistance of the test leads can be nulled on the continuity

range (up to 9,99Ω). The null information is retained in non-

volatile memory and so will be remembered when the

instrument is switched off.

1. Select the Continuity range.

2. Short the test leads across a known good conductor using

prods.

3. When the reading has stabilised, press the TEST button.

The zero offset symbol will appear.

4. To release the zero offset press the TEST button again.

The continuity range features a range lock facility. To LOCK the

continuity range press the key, the LOCK symbol will

appear. To scroll through the available ranges press the

key. To de-select the LOCK feature hold the key

down.

Possible sources of error

Measurements and results can be effected by the following:

• The impedance of operating circuits connected in parallel

• Impedance such as inductors that vary during the measurement

• A poor connection to the circuit under test.

Continuity Bleeper

The continuity bleeper sounds continuously when less than 5Ω

is detected. Short bleeps will sound for resistances lower than

a few kΩ and above 5Ω.

1. Set the selector switch to

2. Connect the test leads.

FIG.2

1 2 3 4 5 6 7 8 9 10 ... 13 14

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