TH2883 Series Operation Manual Chapter 7 User guide
7-2
7.2 Basic measurement
Start up the instrument to enter the default measurement display page. The primary display
zone shows the tested waveform while the secondary one shows parameters of corona or
test.
7.2.1 Non-standard test
This test is applicable to trial sample test.
Switch on the instrument at the test impulse voltage of 1000V and the sample rate of
50MSa/s. Connect the test cable to DUT and press START, thus a test for DUT is done.
Waveforms of the damping oscillation will be displayed in the primary display zone,
observe the density of the waveforms and then modify the sample rate and repeat above
processes. The secondary display zone shows the corona value, which is tested at high
voltage test impulse and directly representing the insulation performance of DUT.
7.2.2 Sample test for standard wave
This test is applicable to batch test.
Modify the test voltage. Press the Standard soft key under the main menu. Choose Auto to
enter the page of auto sample function. Press the Start soft key to automatically change the
test frequencies. After a loop test for DUT is done, a waveform, most suitable for observing
test, will be selected. Press Select to finish the acquisition of standard waveform. Replace a
DUT and then press the START button to start the test. Set some criteria to judge the DUT
to be good or bad.
7.3 BDV test
Determine an impulse voltage appropriate to test.
The applied voltage has little effect on the turn-to-turn short test and the layer-to-layer short
test of coil, but the amplitude of the applied impulse voltage has a great impact on the
insulation test of coil. TH2883 solves the problem of how to set an appropriate voltage.
When it is required to determine an appropriate voltage for a kind of new product or for trial
test, except the industrial specified voltage, TH2883 can find out the appropriate test voltage
by switching on the BDV test function.
Enter the setup page and turn on BDV test. After setting start voltage, end voltage and step
voltage, turn on the corona comparison and return to the measurement display page. Press
START to start the test on DUT from the start voltage and then raise the voltage by step
voltage. By observing the corona discharge (corona transition value), the voltage can be
determined. 70~80% of the voltage is appropriate for test voltage.
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