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scanners at most to operate 16 channels simultaneously.
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Waiting time setup function
ST9201 series can set the test waiting time from 0.1s to 99.9s 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.
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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 resolution is 0.1s from 0.1s to
99.9s and the resolution is 1s from 100s to 200s. ST9201 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).
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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 0.0s to 99.9s (with the
resolution of 0.1s) and 100s to 200s (with the resolution of 1s).
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Discharge function
In common condition, the DUT reacts like a 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 danger of electric shock. ST9201 has the
enforced rapid discharge function after DC withstanding voltage test and
insulation resistance test finish.
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Reinforced safety
In order to improve the safety, ST9201 series allocate many devices and safe
functions including safe output terminal, discharge function and electric wall.
The electric wall means in high voltage test circuit, when return current flowing
through shell is larger than 0.5mA, the high voltage output will be cut off, thus
there will be no shock current in high voltage to protect the operator’s safety.
Even if this function is OFF, this protection will be triggered when the ground
current is larger than 70mA, however please note that such a current can cause
serious harm or even death. See also section 4.4.7.
