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■ Open and short detection: judge the reliability of the DUT before starting the high voltage
to ensure the accuracy and safety of high voltage test.
Open and short detection can judge the distribution impedance current of more than 100PF. When
the current is less than this value, the current acquisition circuit resolution of the instrument can not
distinguish the connection of open circuit and the test component accurately.
■ RS-232C interface as the standard
Except power switch, key lock and execution (auto), other functions can be controlled remotely. In
DC withstanding voltage test, AC withstanding voltage test and insulation resistance test, judge and
time can be controlled remotely. The test result can also be read via remote control. USB and
RS-232C interface provides a stable and united standard test interface for PC or other devices.
■ HANDLER and SIGNAL interfaces bring convenience for the connection and control.
HANDLER interface can input START and STOP signals and output TEST, PASS and FAIL
signals. Connecting with a footswitch, they can construct a foot-control device; while connecting
with simple test fixtures, they can realize safety interlock, air controls, test indication, etc.
SIGNAL interface can input INTERLOCK signal and provide 24V, 0.5A power output. It is
convenient for control and connection.
■ USB interface for backup
Through the USB interface equipped by all testers, tester programmed test programmes and
customer’s measuring file can be saved to or recalled from an external U disk, which is convenient
to set, use and file a batch of testers.
■ Waiting time setup function
The instrument can set the test waiting time from 0.1s to 999.9s by a resolution of 0.1s. In this period,
the tester will output TEST control signals. They are used to control external devices and ensure a
reliable connection. After that high voltage measurement will be enabled.
■ Rising time control function
In AC withstanding voltage test, DC withstanding voltage test and insulation resistance test, the test
voltage can be raised to set value slowly, it can’t provide set voltage to DUT instantly after test starts.
The voltage rise time is from 0.1s to 999.9s and the resolution is 0.1s. TH9310/20 series meet each
UL test standard and IEC withstanding voltage standard（primary voltage is less than the half of test
voltage and it can appoint the fixed rising time when reaching the set test voltage.
■ Fall time control function
In the pass judge of AC withstanding voltage test, the test voltage can be reduced gradually. The
voltage fall time can be set within 0.1s to 999.9s (with the resolution of 0.1s).
■ Discharge function
In common condition, the DUT reacts the feature of capacitance. At the moment of the cut of DC
withstanding voltage and insulation resistance test, the DUT holds the full charge status, so there is a
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