User`s guide

4- 72 Agilent EasyEXPERT User’s Guide Vol. 1, Edition 1

Function Details

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 the 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 Agilent B1500A or B1505A User’s Guide.

The interlock function works as shown below.

• When the interlock circuit is open, maximum output is limited to  42 V.

• When the interlock circuit is close, source channel can force its 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, the 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.