3 Remote Interface Reference
128 Keysight E364xA User’s and Service Guide
Questionable status register
The Questionable Status register provides information about voltage and current
regulation. Bit 0 is set when the voltage becomes unregulated, and bit 1 is set if
the current becomes unregulated. For example if the power supply momentarily
goes to constant current mode when the power supply is operating as a voltage
source (constant voltage mode), bit 0 is set to indicate that the voltage output is
not regulated.
The Questionable Status register also provides information that the power supply
has an overtemperature condition and that the overvoltage protection circuits
have tripped. Bit 4 reports an overtemperature condition of the fan, bit 9 reports
that the overvoltage protection circuit has tripped. To read the register, send
STATus:QUEStionable?.
Table 3-4 Bit definitions – Questionable Status register
The questionable status event register is cleared when:
– You execute the *CLS (clear status) command.
– You query the event register using STAT:QUES? (Status Questionable Event
register) command.
For example, 16 is returned when you have queried the status of the questionable
event register, the temperature condition is questionable.
The questionable status enable register is cleared when:
– You execute STAT:QUES:ENAB 0 command.
Bit Decimal Value Definition
0 Voltage 1 The power supply is/was in the constant current mode.
1 Current 2 The power supply is/was in the constant voltage mode.
2 to 3 Not Used 0 Always set to 0.
4 Overtemperature 16 The fan has a fault condition.
5 to 8 Not Used 0 Always set to 0.
9 Over Voltage 512 The overvoltage protection circuit has tripped.
10 to 15 Not Used 0 Always set to 0.
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