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.
t^okfkd 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.
`^rqflk Connecting COMMON or ANALOG OUT to earth while floating the
input may damage the instrument.
klqb 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.
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