Chapter 4 Remote Interface Reference
The SCPI Status Registers
92
The 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 and overcurrent protection
circuits have tripped. Bit 4 reports an overtemperature condition of the fan, bit 9
reports that the overvoltage protection circuit has tripped, and bit 10 reports that the
overcurrent protection circuit has tripped. To read the register, send
STATus:QUEStionable?.
Table 4-3. 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.
2-3 Not Used 0 Always set to 0.
4 Overtemperature 16 The fan has a fault condition.
5-8 Not Used 0 Always set to 0.
9 Over Voltage 512 The overvoltage protection circuit has tripped.
10 Over Current 1024 The overcurrent protection circuit has tripped.
11-15 Not Used 0 Always set to 0.
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