Chapter 4 Remote Interface Reference
The SCPI Status Registers
106
The Questionable Instrument Summary Register
There are two Questionable Instrument Summary registers, one for each supply
output. These registers provide 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 a supply which is operating as a voltage source (constant
voltage mode) momentarily goes to constant current mode, bit 0 is set to indicate that
the voltage output is not regulated. Bit 9 reports that the overvoltage protection circuit
has tripped. To read the register for each supply, send the command
STAT:QUES:INST:ISUM<n>?, where n is 1 or 2.
To determine the operating mode (CV or CC) for the power supply send
STAT:QUES:INST:ISUM<n>:COND?, where n is 1 or 2 depending on the output.
Bit 1 true indicates the output is in constant voltage mode, bit 0 true indicates constant
current mode, both bits true indicates neither the voltage nor the current is regulated,
and both bits false indicates the outputs of the power supply are off.
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.
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