Kikusui TOS5050A, Руководство по эксплуатации

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TOS5051A/5050A 8-3
Chap
.8
Oper
ating Pr
inciple
[5] Current detector
The current detector measures the leakage current. It consists of an absolute-value
circuit, current detecting resistors, and an integrating circuit.
[6] Control circuit
The circuit controls overall operation of the tester, including voltage measurement,
current measurement, pass/fail judgment, test time management, and test sequence
control.
[7] DC/DC converter
The converter provides a stable high voltage for the DC test mode. The test voltage
is of a positive polarity.
Its rating is 5 kV, 10 mA when the AC line voltage is at its nominal voltage.
[8] Discharge circuit
When in the DC test mode, the test leads, probe, DUT and other items connected to
the output circuit can be charged up to the high DC test voltage. Even after the test
is over and the test voltage is cut off, these items can remain in the charged state for
a substantial period of time. The discharge circuit is to rapidly discharge the charges
stored in these items. The circuit consists of a high voltage relay and a discharge
resistor. The discharge resistance on the TOS5051A is 125 k
Ω .
When the output voltage is cut off, the discharge circuit is automatically brought
into effect and it discharges the internal output circuit of the tester, test leads, probe,
and DUT.
[9] AC/DC switching circuit
This is a high voltage rotary switch which selects either the AC or DC test voltage.