Megger BMM2000 Series Betriebsanweisung PDF herunterladen (Seite 4)

Note: There is a short delay

on the first operation of

‘1000V’ range, each

time the range is

selected. This is to

prevent accidental

application of 1kV.

The MΩ range features a

leakage current display.

Leakage current is the value

of current that flows during

the insulation test. To view

the leakage current press the

key. To view insulation resistance press the key

again.

Good Procedure Whilst Insulation Testing

Care must be taken when taking measurements greater than a

few GΩ. The leads must be clean dry and in good condition.

They must also not be allowed to tangle. It is also advisable

that the switched probe SP1 is not used as the accuracy at

high value measurements is not guaranteed. The instrument

should also be clean and dry with particular attention paid to

the terminals. Also attempt to reduce any leakage that may

give erroneous results on the item under test.

Polarisation Index Testing

Polarisation Index (PI) is the term applied to the Dielectric

Absorption Ratio when resistance values are measured after

1 minute and again after 10 minutes. Polarization Index is then

the resistance value after 10 minutes divided by the resistance

value after 1 minute. The test can be run at any voltage. More

detailed information on PI Testing and value assessment can

be found in AVO International publications listed in the

Accessories page.

Automatic Discharge

When the TEST button is released after an insulation test (or

re-pressed if ltb feature is enabled), a 200kΩ load is

automatically switched across the terminals to discharge the

item under test. Any voltage present will be indicated on the

display so that the discharge can be monitored.

TYPICAL TERMINAL VOLTAGE CHARACTERISTICS

FIG.1

1100

1000

900

800

700

600

500

400

300

200

100

0.01 0.1

1 10 100 1000

1000V

500V

250V

RESISTANCE (MΩ)

VOLT (d.c.)

50V - 1000V Ranges

10V Range

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

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