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External Input and Output Terminals and Signals
Interlock function
The interlock function is a function to shut down the output of the instrument by linking with external
equipment, etc. to secure the safety of the operators.
When the interlock is activated, the instrument enters the protection state and all the key operations
are disabled. Due to this, any test cannot be started even with the START signal from the external
I/O terminal or a communications command.
Interlock activation
When the No. 3 pin (INTERLOCK) of the external I/O terminal is turned off, the interlock function is
activated and the instrument outputs are shut down.
Unlocking the interlocks
After short-circuiting the external I/O terminal INTERLOCK pin (No. 3 pin) and ISO_COM pin (No. 9
and No. 27 pins), press the
STOP
button or input a STOP signal of the external I/O terminal.
IMPORTANT
•
Since the No. 3 pin (INTERLOCK) of the external I/O terminal is open in the factory setting, the
interlock is activated when the main power switch is set to on. To temporarily release it, use the
attached custom-made interlock-canceling connector for the external I/O terminal. Alternatively,
short-circuit the INTERLOCK and ISO_COM pins of the external I/O terminal.
• It is recommended to use the interlock function to ensure the safety of the operator for actual
withstand voltage and insulation resistance tests.
Interlock connection example
Prepare a box where the DUT will be placed to prevent workers from touching the tester and
DUT during high-voltage output. Attach a switch on the cover of the box and link the switch to the
interlock function. The interlock is activated when the cover is opened and released when the cover
is closed to allow a test to be performed. When the interlock is activated, all the key operations are
disabled.
External Control (EXT
. I/O)
HIOKI ST5680A961-00
Содержание ST5680
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