Agilent Technologies E3633A User Manual (English)

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Chapter 4 Remote Interface Reference

The SCPI Status Registers

Using *STB? to Read the Status Byte

The *STB? (Status Byte query) command is similar to a serial poll but it is processed

like any other instrument command. The *STB? command returns the same result as

a serial poll but the “request service” bit (bit 6) is not cleared.

The *STB? command is not handled automatically by the IEEE-488 bus interface

hardware and will be executed only after previous commands have completed. Polling

is not possible using the *STB? command. Executing the *STB? command does not

clear the Status Byte summary register.

Using the Message Available Bit (MAV)

You can use the Status Byte “message available” bit (bit 4) to determine when data is

available to read into your bus controller. The power supply subsequently clears bit

4 only after all messages have been read from the output buffer.

To Interrupt Your Bus Controller Using SRQ

1 Send a device clear message to clear the power supply’s output buffer (e.g.,

CLEAR 705).

2 Clear the event registers with the *CLS (clear status) command.

3 Set up the enable register masks. Execute the *ESE command to set up the

Standard Event register and the

*SRE command for the Status Byte.

4 Send the *OPC? (operation complete query) command and enter the result to

ensure synchronization.

5 Enable your bus controller’s IEEE-488 SRQ interrupt.

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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