Questionable Status Groups
These registers record signals that indicate abnormal operation. The groups consist of a Condition,
PTR/NTR, Event, and Enable register. The outputs of the Questionable Status groups are logically-
ORed into the QUEStionable summary (bit 3) of the Status Byte register. When bit 3 of the Status Byte
is asserted, you must query the Questionable and the Questionable2 status registers to determine
which one asserted bit 3. Refer to Status Diagram.
The following table describes the Questionable1 Status register bit assignments.
Bit Bit Name Decimal Value Definition
0 OV 1 Output is disabled by the over-voltage protection
1 OC 2 Output is disabled by the over-current protection
2 PF 4 Output is disabled by a power-fail (ac low-line or brownout )
3 OP+ 8 Output is disabled by the positive over-power protection
4 OT 16 Output is disabled by the over-temperature protection
5 OP- 32 Output is disabled by the negative over-power protection
6 OV- 64 Output is disabled by the negative over-voltage protection
7 LIM+ 128 Output is in positive voltage or current limit
8 EDP 256 Output is disabled by excessive output dynamic protection
9 INH 512 Output is disabled by an external INHibit signal
10 UNR 1024 Output is unregulated
11 LIM_PROT- 2048 Output is disabled because low limit protection time expired
12 OC- 4096 Output is disabled by the negative over-current protection
13 LIM- 8192 Output is in negative voltage or current limit
14 LIM_PROT 16384 Output is disabled because high limit protection time expired
15 not used not used 0 is returned
The following table describes the Questionable2 Status register bit assignments.
Bit Bit Name Decimal Value Definition
0 MC 1 Output is disabled because module communication failed
1, 2 not used not used 0 is returned
3 CSF 8 Output is disabled by current sharing fault protection
4 LFP 16 Output is disabled by leader/follower protection
5 not used not used 0 is returned
6 UV 64 Output is disabled by under-voltage protection
7 OCF 128 Output is disabled by internal over-current protection
Keysight MP4300 Series Operating and Service Guide 149
5 SCPI Programming Reference
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