Agilent Technologies 4294A Service Manual download pdf (Page 76)

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101

76 Chapter 5

Starting a Measurement (Trigger) and Detecting the Completion of a Measurement

(End of Sweeps)

Waiting for the Completion of One or More Sweeps (Detecting the

Completion of a Measurement)

Using the *OPC? command

The “SING” command on page 437 and “NUMG” command on page 364 are overlap

commands whose executions are finished at the completion of one or more sweeps.

Therefore, if you start one or more sweeps with these commands, you can detect their

completion with the following command.

• “*OPC?” on page 259

Example 5-2 shows a sample program to detect the completion of a sweep by using the

“*OPC?” command. This program is stored on the sample program disk with the

swp_opc.bas filename.

This program starts a sweep from the “SING” command, waits for the completion of this

command’s execution with the “*OPC?” command (the completion of a single sweep),

displays a message at the completion of the sweep, and then finishes.

Lines 20 to 60 Identifies the external controller and Instrument BASIC and sets the

GPIB address.

Line 80 Sets the trigger source to the internal trigger.

Lines 90 Starts a single sweep.

Lines 110 to 120 Executes the “*OPC?” command and waits for 1 to be returned (the

completion of the sweep).

Line 130 Displays the sweep completion message.

Example 5-2 Detecting the completion of a sweep using the “*OPC?” command

10 DIM Buff$[9]

20 IF SYSTEM$("SYSTEM ID")="HP4294A" THEN

30 ASSIGN @Hp4294a TO 800

40 ELSE

50 ASSIGN @Hp4294a TO 717

60 END IF

70 !

80 OUTPUT @Hp4294a;"TRGS INT"

90 OUTPUT @Hp4294a;"SING"

100 PRINT "Waiting..."

110 OUTPUT @Hp4294a;"*OPC?"

120 ENTER @Hp4294a;Buff$

130 PRINT "Sweep Complete"

140 END

Inserting a wait

You can use a setting to make the controller wait for the completion of one or more sweeps

performed by the Agilent 4294A (for example, using the WAIT command of HP

BASIC).

This method is simple, but if you set an inappropriate wait, unexpected errors could occur.

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