Chapter 4 Remote Interface Reference
The SCPI Status Registers
92
The Questionable Status Register
The Questionable Status register provi des inform atio n 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 als o provides inform ation that the power
supply has an overtemperature condition and that the overvoltage and
overcurrent protection circuits have tripped. Bit 4 report s 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
comm and.
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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