Keithley 6485 Instruction Manual page 163

Model 6485 Picoammeter Instruction Manual
Programming example — The following command sequence configures Model 6485 to
be controlled by bus triggers. The last line, which sends a bus trigger, triggers one mea-
surement. Each subsequent bus trigger will also trigger a single measurement.
*RST
ARM:SOUR BUS
ARM:COUN INF
INIT
*TRG
F) TST? — self-test query
Use this query command to perform a checksum test on ROM. The command places the
coded result (0 or 1) in the output queue. When Model 6485 is addressed to talk, the coded
result is sent from the output queue to the computer.
A returned value of zero (0) indicates that the test passed, and a value of one (1) indicates
that the test failed.
G) WAI — wait-to-continue
Effectively, the *WAI command is a No-Op (no operation) for Model 6485 and thus, does
not need to be used.
Two types of device commands exist:
•
•
The *WAI command is used to suspend the execution of subsequent commands until the
device operations of all previous overlapped commands are finished. The *WAI command
is not needed for sequential commands.
Sequential commands — A command whose operations are allowed to finish
before the next command is executed.
Overlapped commands — A command that allows the execution of subsequent com-
mands while device operations of the overlapped command are still in progress.
' Restore RST defaults.
' Select BUS control source.
' Set arm layer count to infinite.
' Take 6485 out of idle.
' Trigger one measurement.
Run self test and read result
Wait until previous commands are completed
Common Commands 11-5