Technical data

Remote Interface Reference 3
SCPI Status Registers
E364xA User’s and Service Guide 105
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 into the 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 protection circuits have tripped. Bit 4
reports an overtemperature condition of the fan and bit 9
reports that the overvoltage protection circuit has tripped.
To read the register, send STATus:QUEStionable?.
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) query.
For example, 16 is returned when you have queried the
status of the Questionable Event register, which indicates
the temperature condition is questionable.
Table 3 - 5 Bit definitions — Questionable Status register
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 to 3 Not Used 0 Always set to 0.
4 Overtemperature 16 The fan has a fault condition.
5 to 8 Not Used 0 Always set to 0.
9 Overvoltage 512 The overvoltage protection circuit has tripped.
10 to 15 Not Used 0 Always set to 0.