Chroma 19020 User Manual

Precaution before Use
3-3
follow the instruction described above for actions. Do not touch any area that may cause
electric shock especially when the power is just turned off.
10. Ensure the charged voltage is fully discharged
The time required for fully discharging the voltage depends on the test voltage applied
and the features of UUT. Assuming the high voltage added on the UUT equals the high
voltage added to a 0.01uF capacitor and paralleled to a 100MΩ resistance circuit. When
the test voltage is 1000V, then it requires approximately 3.5 seconds for the voltage that
added to test and on UUT to fall to 30V under after turned off the power. For 500V test
voltage, it requires about 2.8 seconds. Assuming the time constant of a UUT is already
known, the way described above can be used to calculate the time required for voltage
falling to 30V under after powered off by timing the time constant multiple to the time
decreased to 30V under as Figure 3-3 shows.
Calculation: Vo
e
RC
t /
−
= VIL
Ex : 1000V ×
e
RCt /−
= 30V
e
RCt
/−
= 0.03
-t / RC = ln 0.03 ∴ t = 3.5 Sec
Figure 3-3
11. Remote controlling the Tester
The Hipot Tester can be remote controlled generally for high voltage output via external
control signal. When performing it, it is necessary to follow the control guidelines for
safety and precautions.
∗ Do not allow any accidental high voltage output that may cause hazard.
∗ When there is high voltage output from the Tester, do not allow any operator
or other personnel to touch the UUT, test cable or probe output and etc.
12. Turning on or off the power switch
Once the power switch is turned off, it needs to wait for a few seconds to turn it on again.
Do not power it on and off continuously to avoid occurring errors. It is very dangerous to
power it on and off continuously when in high voltage output state in particular. When
turning on or off the power, the high voltage output terminal cannot connect to
any object to avoid the hazard caused by abnormal high voltage output.
13. Other notices
Do not short-circuit the output line, grounding wire, communication cable or other
device’s grounding wire or AC power to avoid charging the entire Tester to dangerous
voltage. To short-circuit the terminal of high voltage output and LOW, it is necessary to
ground the Tester chassis to earth properly.

Chroma 19020 Specifications

General

Brand	Chroma
Model	19020
Category	Test Equipment
Language	English