Keithley 6487, Reference Manual

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2-14 Measurement Concepts and Connections Model 6487 Reference Manual
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 interlock
programming (see below).
Interlock programming
Table 2-1 summarizes the commands associated with controlling the 10V range interlock
and determining if the interlock is asserted. For example, to enable the 10V range inter-
lock, send SOURce[1]:VOLTage:INTerlock[:STATe] ON. See
Section 3 and Section 14
for information on additional voltage source commands.
Analog output
The Model 6487 has an analog output on the rear panel. The ANALOG OUT provides a
scaled, inverting ±2V output. A full-scale reading corresponds to ±2V output.
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The maximum safe voltage between the voltage source or ammeter and
chassis ground (common mode voltage) is 505V DC. Exceeding this
voltage can create a shock hazard.
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Connecting COMMON or ANALOG OUT to earth while floating the
input may damage the instrument.
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Analog outputs will be at same voltages as applied to the triax shell.
Connections for using this output are shown in Figure 2-11 . For a full-scale input (i.e.
2mA on the 2mA range), the output will be -2V. Example analog outputs are listed in
Table 2-2 .
Table 2-1
Interlock commands
Command Description Default
SOURce[1]
:VOLTage
:INTerlock
[:STATe] <b>
:FAIL?
SOURce1 Subsystem:
Interlock control:
Enable or disable 10V range interlock.
1
Query if interlock is asserted:
2
1 = asserted; source cannot be turned on.
OFF
1. Interlock is always enabled for 50V and 500V ranges and cannot be programmed.
2. Query can be used for all three source ranges: 10V, 50V, and 500V.