Megger BMM500 Series, User Manual

Page: 9 / 84

Operation
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 200k
Ω
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
Continuity Testing (
Ω
) (See fig.2)
The continuity tests are activated when the
probes make contact of less than a few k
Ω
. 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
6
L1
L2
L3
N
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 (M
Ω
)
VOL
T
(d.c.)