Agilent Technologies E3633A User Manual (English)

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Chapter 4 Remote Interface Reference

The SCPI Status Registers

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

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.

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General

Output Current Range	0 to 3 A
Operating Temperature Range	0 to 50 °C
Storage Temperature Range	-40 to 70 °C
Ripple and Noise (Vp-p)	Voltage: <2 mV
Current Ripple and Noise (20 Hz to 20 MHz)	<500 μA
Voltage Programming Accuracy	0.05% + 10 mV
Current Programming Accuracy	0.1% + 5 mA
Ripple and Noise (rms)	≤ 350 µV