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Chapter 3 Programming Your Universal Counter for Remote Operation
Elements of SCPI Commands
Programming Guide 3-31
• Bits 1–3 are not used.
• Bit 4 (Measuring) is a condition bit which indicates the Counter is
actively measuring.
The condition bit is TRUE (one) during a measurement and FALSE (zero)
otherwise.
If the external reference has been explicitly selected and an absent or
invalid signal at the external reference input is detected, then the Counter
will not report Measuring (even though it may perform an auto trigger) in
response to the user initiating a measurement.
• Bits 5–7 are not used.
• Bit 8 (Computing Statistics) is a condition bit which indicates the
Counter has begun collecting measurements for the next statistical
computation.
The condition bit is TRUE (one) once the first of N measurements has
begun, and remains TRUE until the last of N measurements has
completed.
• Bit 9 (Using Internal Reference) is a condition bit which indicates the
Counter is using the internal reference.
The condition bit is TRUE (one) while the Counter is using the internal
reference. The condition bit is FALSE (zero) while the Counter is using
the external reference.
This bit monitors both explicit and automatic reference changes. Explicit
reference changes occur when you select internal or external using the
front-panel Utility menu or the HP-IB command, [:SENS]:ROSC:SOUR.
Automatic reference changes occur when the Counter is configured to
select the reference (automatically) by detecting whether or not an external
reference is being supplied.
• Bit 10 (In Limit Event) is an event bit indicating the last measurement
limit tested was “in limit.”
Each and every time a measurement is limit tested and found to be in
limit, this event will be reported.