Remote Interface Reference 3
E364xA User’s and Service Guide 135
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 the 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 the constant voltage mode, bit 0 true indicates
the constant current mode, both bits true indicate neither the voltage nor the
current is regulated, and both bits false indicate 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 the 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 the
STAT:QUES:ENAB 0 command.
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