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Chapter 4 Remote Interface Reference
The SCPI Status Registers
104
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.