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10
DANGER
light is off and remove the hidden danger.
As soon as the output is cut off, the tester’s discharge circuit starts forced discharging. Do not
disconnect the DUT during a test or prior to the completion of discharging.
Under normal circumstances, it can be guaranteed that the test circuit voltage will be within the safe
voltage range at the end of discharge.
When the capacitance of the DUT is too large or the structure of the DUT is special, the discharge
may be incomplete; the test method must be changed by the technician to ensure complete
discharge.
Discharge time:
Computational formula of discharge time: t = -In (30 / U) ×R×C
t: discharge time
30: discharge residue safety voltage 30V
U: test set voltage
R: discharge impedance of the DUT, approx. 10KΩ
C: capacitance of the DUT
Generally, only the DC type high voltage test needs to be discharged, and the length of the discharge
time depends on the nature of the DUT.
During the test, if it ends normally, the voltage will drop to zero according to the voltage drop time.
If the test fails, the discharge of the DUT is achieved by the secondary side of the transformer
(approximately 10k resistor), it takes approximately 0.05S for a 1uF capacitor with a high voltage
of 6000V to be discharged to 30V. The fixed discharge time of the instrument is 0.2S to ensure the
discharge of the device is completed.
2.5
Handling for Dangerous State of Faulty Tester
Typical possible dangerous conditions of the instrument are described below, the most dangerous of
which is the occurrence of “high voltage at the output and the instrument is out of control”. When this
happens, please immediately turn OFF the power switch and unplug the AC power cable from the AC
line receptacle.
Immediately keep far away from the instrument and confirm no risk of the test circuit by the technical
personnel; or keep the instrument still for more than one hour and confirm no output voltage in the
test terminal.
Remove the relevant connecting lines and send the instrument back to us for maintenance.
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Warning
：
Keep away from the instrument after turning off the power and prevent other people
from approaching. Do not immediately disassemble the test circuit. Immediately call our
distributor or agent.
High voltage may remain in the interior of the instrument. It is hazardous for an
unqualified person to attempt to troubleshoot any tester problem.
