HP 53150A Series Programming Manual page 78

Chapter 3 Programming Your Counter for Remote Operation
Status Reporting
A detailed description of each bit in the Operation Status Register follows:
• Bits 0-3 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.
• Bits 5 (Waiting for Trigger)
The condition bit is TRUE (one) when the Counter is in the HOLD
mode (INIT:CONT OFF), and it has not been triggered.
• Bits 6-8 are not used.
• Bit 9 (Using Internal Reference) is a condition bit which indicates
the Counter is using the internal reference.
The condition bit is TRUE (one) when the Counter is using the
internal reference. The condition bit is FALSE (zero) while the
Counter is using the external reference. The setting of this bit is not
affected by the setting of the REF OSC option in the user settings
menu.
• Bit 10 is not used.
• Bit 11 (Acquiring) indicates that the counter is searching for a
signal.
The condition bit is high while the counter is searching. It goes low
when a search is complete, whether or not a signal was found. If a
signal was not found, the bit goes high again after a delay (when the
next search begins).
• Bit 12 (Locked) a value of 1 indicates that the counter has found a
measurable signal and has locked onto it.
• Bits 13-15 are not used.
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