MZC-304
– USER MANUAL
27
4
Troubleshooting
Before returning the instrument for repair, call the service, perhaps the meter is not damaged and
the problem has occurred for another reason.
The meter repairs should be carried out only in the outlets authorized by the manufacturer.
The following table describes the recommended procedure in certain situations that occur when
using the meter.
Measuring
function
Symptom
Cause
Action
All
The meter will not start
after pressing the
button.
The
symbol is dis-
played during the volt-
age measurement.
Meter turns off during
the initial test.
Discharged or incorrect-
ly placed batteries/ re-
chargeable batteries
Check if the batteris are
placed correctly, replace
and/or recharge the bat-
teries. If this does not
help, sent the meter for
servicing.
Measurement errors af-
ter moving the meter
from cold environment
to warm and humid en-
vironment.
No acclimatization
Do not perform the meas-
urements until the meter
reaches the ambient tem-
perature (about 30
minutes) and dries.
Fault
loop
Sucessive results ob-
tained in the same
measuring point are
significantly different
from each other
Incorrect connections in
the tested mains.
Check the connections
and remove defects
Mains with high noise or
unstable voltage
Perform a larger number
of measurements, aver-
age the results
The meter indicates the
values close to zero or
zero irrespective of the
location of the meas-
urement and these val-
ues are significantly dif-
ferent than expected.
Incorrectly selected test
leads in the meter set-
tings.
The
symbol does not
appear, although the
voltage between the
contact electrode and
the
PE
conductor ex-
ceeds the detector
threshold (about 50V)
Contact electrode is not
functioning correctly or
the meter input circuits
are damaged
Return the meter for ser-
vicing; he use of a mal-
functioning meter is
unac-
ceptable
Rotary switch in a wrong
position.
Contact electrode is active
for the measurements of
the Z
L-PE
fault loop pa-
rameters.
