VR2250
Page 21 of 131
Standard
Brief description
Test voltage
Maximum limit value
CEI 64-8/6
Systems SELV or PELV
Systems up to 500V (Civil installations)
Systems over 500V
250VDC
500VDC
1000VDC
> 0.250M
Ω
> 0.500M
Ω
> 1.0M
Ω
CEI 64-8/4
Floor and wall insulation in civil installations
Floor and wall insulation in systems over 500V
500VDC
1000VDC
> 50k
Ω
(se V<500V)
> 100k
Ω
(se V>500V)
EN60439
Electrical panel boards 230/400V
500VDC
> 230k
Ω
EN60204
Electrical equipment of machines
500VDC
> 1M
Ω
Table1:
Table for test voltages and the corresponding limit values for reference.
Rated voltage selected
for the test
R
MAX
= Maximum resistance
value
50VDC
99.9M
Ω
100VDC
199.9M
Ω
250VDC
499M
Ω
500VDC
999M
Ω
1000VDC
1999M
Ω
Table2:
Table of maximum resistance values which can be measured under M
Ω
mode depending on the rated voltage selected.
6. If the
"TMR"
mode was selected use the
F3
,
F4
keys to set the duration time of
the test:
CAUTION
Never disconnect the test leads from the circuit under test when the
message
"MEASURING"
is displayed as the circuit under test may remain
charged at a dangerous voltage. The instrument has an internal "safety
resistor" which is connected to output terminal before end of test in order to
discharge the parasite capacities of the installation
7. Press the
START
key.
The instrument will start the test.
MAN Mode: The test will take 4 seconds (maximum). If you keep
the START key pressed longer than 4 seconds the test continue
until the key is released.
TMR mode: The test will take the time set. If you want to stop
the test when it's running, press the START STOP key again.
START
STOP