2-12 Connections Model 6485 and 6487 User’s Manual
Model 6487 interlock
The Model 6487 has a built-in interlock that works in conjunction with the voltage source.
The interlock prevents the voltage source from being placed in operate on the 50V and
500V ranges, and optionally on the 10V range, to assure safe operation.
Interlock connections
Figure 2-13 shows interlock connections and the pin diagram of the INTERLOCK connec-
tor. Typically, the INTERLOCK connector is conn
ected to the same type of connector on
the test fixture. A normally open switch is connected to pins 1 and 2 of the INTERLOCK
connector as shown. When the switch is open, the interlock is asserted and the voltage
source cannot be placed in operate on the 50V or 500V voltage source ranges and option-
ally for the 10V range.
WARNING If
the voltage source was operating when the interlock is asserted, the
voltage source will change to a high impedance state, possibly leaving
charged DUT capacitance.
Interlock operation
The interlock is always operational for the 50V and 500V voltage source ranges. To
enable the voltage source output, pins 1 and 2 of the INTERLOCK connector must be
shorted together. For the 10V range, the interlock is optional and can be controlled with
instrument programming. To enable the 10V range interlock, send :SOUR:VOLT:INT
ON. To disable the 10V range interlock, send :SOUR:VOLT:INT OFF.
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