17
Full-electronic HV-Tester F1-1x Typs
2. SAFETY REGULATIONS
when working with high voltage!
Follow DIN EN 50191 (DIN VDE 0104). The EN standard regulates the
operation of test systems and test benches.
Attention high voltage:
The contact elements used for the HV and IS
test (test probes etc.) must be designed for the maximum voltage supplied
by the device.
2.13
Discharging test objects with internal capacitance
A
ttention discharge currents - mortal danger!!
particularly in
the case of test objects with internal capacitance (capacitors).
Particularly during tests with
DC
, test objects with internal capacitance
can
store large amounts of charge
. After disconnecting, this charge
may be dissipated via the operator‘s body (if the test object is touched in
the appropriate place).
If the test object is left connected to the tester after switching off the high
voltage, it will discharge automatically via the tester. If this discharging
is prevented (disconnection), potentially fatal discharge currents may be
produced.
Note Ma
ins Switch:
Do not switch-off the Tester on running HV-/IS-test.
In this case, a correct discharge of the test object not ensure.
2.14 Discharging via the device
After the end of the test (end of test time), the test object connected is au-
tomatically discharged. For this purpose a discharge resistor is connected
internally and the voltage across the resistor read (residual voltage meas-
urement) The discharging is undertaken using an internal 5 MOhm resistor
until a voltage of 3000 V is reached, the device then connects a 2 MOhm
resistor in parallel. If the voltage doesn‘t underrun a residual voltage of 60 V
within - 10 s at DC / 500 ms at AC - the device indicates the fault message
„Attention residual voltage“.
Note:
The residual voltage measurement can be switched off on the „Setup“
menu or using an interface command (see the remote control manual).
Automatic discharging is performed only at DC test voltages. At AC, the
discharging of the test object is running via high-voltage transformer.
Att
ention:
Leave the test object connected until it is discharged. The
device indicates this state with the illumination of the green RUN button.
Additional discharging via an external resistor
The device has an output for the connection of an external discharge re-
sistor. At the end of the HV/ IS test this output is connected by the device.
On this topic see chapter 6.2.4.1 „Outputs/external discharge relay“.