◇35
4.4.1 Start up test
In measurement mode, after the tester check the test conditions and the connection with DUT, press
START to start up test.
4.4.2 Test delay
After the delay set by STA DELY in SYSTEM, the tester will start measurement.
4.4.3 Test voltage rise
Some DUTs are voltage-sensitive, so this function is useful. The output voltage rises from zero. The
resolution of the output voltage, controlled by the instrument, varies in every 0.1S and depends on the
test voltage and the voltage rise time (ΔV = V / (10*S)). If the voltage rise time (RISE OFF) is turned
off, the default voltage rise time will be 0.1S.
4.4.4 DC RAMP
Using the current upper limit judge function in the process of the voltage rise is mainly to avoid
erroneous judgement. When the test distributed capacitance is small, under the circumstance of no
obvious change in current due to small charge current of the capacitance, RAMP can detect the poor
performance of the DUT as soon as possible and decrease the discharge damage probability of the
components. When the test distributed capacitance is large, there is a charging process of the capacitance
in voltage rise process, now, the current may be far greater than the set current upper limit. If RAMP is
set as ON, it may cause erroneous judgement of exceeding the upper limit.
4.4.5 High-voltage test
This function is used to make high-voltage test on DUT. The test circuit should be connected
correctly. The measurement result will not be affected by special attach parameters and be the real
withstanding-voltage current required by the test.
4.4.6 Voltage fall
It is the same as the voltage rise function depending on the characteristics of DUT. The voltage will
fall when the high-voltage test ends. The resolution of the output voltage, controlled by the instrument,
varies in every 0.1S and depends on the test voltage and the voltage rise time(ΔV = V / (10*S)). If the
voltage fall time (FALL OFF) is turned off, the default voltage rise time will be 0.1S. At this moment,
the instrument will not conduct test compare judgement and the data is for reference only.
4.4.7 Ground wire current detection function
Ground wire current detection is detecting the current flowing through the shell of the instrument to
avoid electric shock. When high voltage is output, the current will flow back to the shell of the
instrument from voltage output terminal. It may cause very serious consequences.
Circuit response instruction of ground wire current detection:
When GFI is set as ON, it will be judged as electric shock when the ground wire current is larger
than 0.45mA.
When electric shock is judged, the instrument will end the high voltage output in 0.3s and quit the
test mode. GFI FAIL will be displayed.
NOTE: when the ground wire current reaches 30mA, if electric shock is really judged, the condition is
To Next Page
Loading...
