Amprobe MEGATEST-1000 Megohmmeter - Manual (Page 20)

5.2.2.4 ANOMALOUS CASES:
Anomalous cases which may occur during the insulation tests "MAN", "AUTO", "TIMER"
The symbol ">" means that the resistance value R
ISO
is higher than R
MAX
.
R
ISO
> 999
M Ω
500 V 20
s
MAN
In case a value of M Ω higher than
R
MAX
was detected (depending on the
selected voltage see following Note
Table, the instrument emits a double
sound signal at the end of the test
indicating the positive outcome of
the test and displays one screen
similar to the screen alongside.
Maximum
resistance
value which
can be
measured
(999
Ω is
displayed if
a rated
voltage of
500V was
selected
see Table).
Test duration.
Selected mode (MAN is indicated in the
picture).
SAVE
The test can be stored pressing the SAVE key twice (according to
paragraph 0).
R
ISO
o0.01
M Ω
500 V 20
s
MAN
In case a test is taken at a voltage
lower than the set rated voltage, at
the end of the test the instrument
emits a long sound signal and
displays one screen similar to the
screen alongside.
ATTENTION: the test of resistance M Ω
was taken at a
voltage value lower than the set rated voltage. Low
insulation case. This case occurs under low insulation
conditions or in the presence of capacity on the
installation.
Selected mode (MAN is
indicated in the picture).
SAVE
The tests can be stored pressing the SAVE key twice (according to
paragraph 0).
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