METREL MI 3200 - Withstanding Voltage

MI 3200 TeraOhm 10 kV Measurements
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Fig. 26. Set-up menu of the Graph R(t)
Notes:
- The time duration of Graph R(t) is equal to the value of Step Time Multiplied by 5.
- The Timer value could be very long (up to 150 minutes), so the Special automatic
decimation algorithm is use to write the Graph R(t) to the LCD.
- The cursors of the Graph R(t) could be activated with  key
- The cursors of the Graph R(t) could be moved with  and  keys.
Warning!
 Refer to Warnings chapter for safety precautions!
5.8. Withstanding voltage
This function offers Withstanding Voltage test of insulation material. It covers two types
of tests:
a) Breakdown voltage testing of high voltage device, e.g. transient suppressors and
b) DC withstanding voltage test for insulation coordination purposes.
Both functions require breakdown current detection. The test voltage increases step by
step from the Start up to the Stop value over a predefined time and it is kept at the Stop
value for a predefined test time, see the figure below.
Both functions require breakdown current detection. In the function, the test voltage is
increased from the starting voltage to the stop voltage over a predefined time (set by the
parameters). The Stop voltage is then maintained for a predefined test time, (see the
Fig. 27).
Ut Ut
Ustop
Ub
Ustart Ustart
U
step
00
T
step T end
tt
Fig. 27. Test voltage presentation without breakdown (left part) and with breakdown
(right part)
Ut ........ Test voltage
Ustop ... End test voltage