Remote Commands and Syntax
Check the Calibrator Status 6
6-55
ZERO CAL When 1, DC Zero Cal is necessary.
ACXFER When 1, ac/dc transfer is active.
SETTLED When 1, the output has stabilized to within specification.
REMOTE When 1, the Calibrator is under remote control.
WBND When 1, the wideband is active.
SCALE When 1, scaling is active.
OFFSET When 1, an offset is active.
PLOCK When 1, the Calibrator output is phase locked to an external source.
PSHFT When 1, variable phase output is active.
RLOCK When 1, the Calibrator output range is locked.
RCOMP When 1, two-wired compensation is active when in resistance mode.
BOOST When 1, an auxiliary amplifier is active.
EXSENS When 1, external sensing is selected.
EXGARD When 1, external voltage guard is selected.
OPER When 1, the Calibrator is operating, When 0, it is in standby.
Read the ISR, ISCR, or ISCE
To read the contents of the ISR, send the remote command, ISR?. In a similar fashion, to
read the contents of the ISCR, send ISCR?, and to read the contents of the ISCE, send
ISCE?. The Calibrator returns a decimal number representing bits 0 through 15. Each
time the ISCR is read, its contents are zeroed.
Load the ISCE
By resetting the bits in the ISCE, the associated bits in the ISCR can be masked
(disabled). For example, to cause an SRQ interrupt when an attached 5725A Amplifier
turns on, bit 3 (BOOST) in the ISCE register must be 1. (The ISCB bit must also be
enabled in the SRE.)
Fault Queue
When a command fault, execution fault, or device-dependent fault occurs, its fault code is
placed in the fault queue where it can be read by the FAULT? command. All fault codes
are defined in Appendix A of this manual. Another way to decode a fault code is to send
the command, EXPLAIN?, which returns a description of a fault code. Reading the first
fault with the FAULT? command removes that fault from the queue. A response of 0
means the fault queue is empty.
The fault queue contains up to 16 entries. If many faults occur, only the first 15 faults are
kept in the queue. A 16th entry in the queue is always a "fault queue overflow". fault, and
all later faults are discarded until the queue is at least partially read. The first faults are
kept, because if many faults occur before the user can acknowledge and read them, the
earliest faults are the most likely to point to the problem. The later faults are usually
repetitions or consequences of the original problem.
The OPER command is inhibited for outputs of 22 V or greater whenever there is a fault
in the fault queue. The OPER command remains inhibited until either the fault queue or
the ESR is cleared.
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