Amprobe AMB-110 Insulation-Resistance-Tester - Manual (Page 31)

26
� Warning!
• Refer to Warnings chapter for safety precautions!
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. 26).
Ut Ut
Ustop
Ub
Ustart Ustart
U
step
0 0
T
step
T
end
t t
Fig. 26 Test voltage presentation without breakdown (left part) and with breakdown (right part)
Ut ........... Test voltage
Ustop ..... End test voltage
Ustep ..... Voltage step approx. 25 V (fixed value - not preset-able)
Ustart ..... Starting voltage
Tstep ...... Test voltage duration per step
Tend ....... Constant test voltage duration after reaching End value
t .............. Time
Ub .......... Breakdown voltage
Selecting this function displays the following states. The Fig. 27 shows the initial screen and a
screen with results after the completion of a measurement.
Initial display Display with results
Fig. 27 Withstanding Voltage function display states