Agilent Technologies B1500A Guía de usuario Pagina 446

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7- 64 Agilent B1500 User’s Guide, Edition 7
Function Details
Interlock Function
Interlock Function
The interlock function is designed to prevent electrical shock when a user touches
the measurement terminals. If the Interlock terminal is open, maximum output is
limited to ± 42 V.
To perform high voltage measurement more than ± 42 V, connect th
e Interlock
terminal to an interlock circuit of test fixture or connector plate. The interlock circuit
must have one LED and two mechanical switches placed near the shielding box
opening doors. And they must be connected together. For details on how to install
the interlock circuit, see “To Make an Interlock Circuit” on page 3-29.
The interlock function works as shown below.
When the interlock circuit is open, maximum output is limited to ± 42 V.
Whe
n the interlock circuit is close, source channel can force it
s maximum output
value.
When the interlock circuit is opened in the high voltage condition more than
± 42 V, output voltage is set to 0 V immediately.
CAUTION If the actual output value is not set to 0 V within 120 msec, Agilent B1500
automatically performs the initialization. Then perform self-test. Any module may
be defective.
WARNING Dangerous voltage of up to the maximum voltage of SMUs may be present at
force, guard, and sense terminals if the Interlock terminal is closed.
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