HP 132A, 53131A 1–3, 5–7, Bits, Bits, Bit 4 (Measuring), Bit 10 (In Limit Event), Bit 8 (Computing Statistics), Bit 9 (Using Internal Reference)

Chapter 3 Programming Your Universal Counter for Remote Operation

Elements of SCPI Commands

∙Bits 1–3are 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 5–7are 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.

Programming Guide 3-31