Technical data

Introduction to SCPI 1
U2761A Programmer’s Reference 13
Questionable Data register
The Questionable Data register group provides the information on the
quality or integrity of the U2761A. The outputs of the Questionable Data
group are logically-ORed into the Questionable summary bit (3) of the
Status Byte register.
Bit definitions: Questionable Data register
The STATus:PRESet command will clear all bits in the enable register.
Bit number Decimal value Definition
0 to 3 Not Used Not Used 0 is returned
4 Over Temperature 16 Internal temperature is over the limit. The U2761A is automatically
reset to the default factory settings.
5 Loop Unlocked 32 The internal phase-lock loop is unlocked. Frequency accuracy will
be affected
6 to 7 Not Used Not Used 0 is returned.
8 Calibration Error 256 Error occurred during calibration or the calibration memory is lost
9 External Reference 512 External phase reference is being used
10 to 15 Not Used Not Used 0 is returned