Agilent Technologies 8753ET Guia do Utilizador descarregar pdf (Página 387)

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Chapter 7 7-21

Programming Examples

Measurement Setup Examples

Example 1B: Verifying Parameters

This example shows how to read analyzer settings into your controller. Appending a “?” to

a command that sets an analyzer parameter will return the value of that setting.

Parameters that are set as ON or OFF when queried will return a zero (0) if off or a one (1) if

active. Parameters are returned in ASCII format, FORM 4. This format varies in length

from 1 to 24 characters-per-value. In the case of marker or other multiple responses, the

values are separated by commas.

The following is an outline of the program's processing sequence:

• An I/O path is assigned for the analyzer.

• The system is initialized.

• The number of points in the trace is queried and dumped to a printer.

• The start frequency is queried and output to a printer.

• The averaging is queried and output to a printer.

• The analyzer is released from remote control and the program ends.

Running the Program

The analyzer is preset. The preset values are returned and printed out for: the number of

points, the start frequency, and the state of the averaging function. The analyzer is

released from remote control and the program ends.

BASIC Program Listing

10 ! This program performs some example queries of network analyzer

20 ! settings. The number of points in a trace, the start frequency

30 ! and if averaging is turned on, are determined and displayed.

40 !

50 ! EXAMP1B

60 !

70 ASSIGN @Nwa TO 716 ! Assign an I/O path for the analyzer

80 !

90 CLEAR SCREEN

100 ! Initialize the system

110 ABORT 7 ! Generate an IFC (Interface Clear)

120 CLEAR @Nwa ! SDC (Selected Device Clear)

130 OUTPUT @Nwa;"OPC?;PRES;" ! Preset the analyzer and wait

140 ENTER @Nwa;Reply ! Read in the 1 returned

150 !

160 ! Query network analyzer parameters

170 OUTPUT @Nwa;"POIN?;" ! Read in the default trace length

180 ENTER @Nwa;Num_points

190 PRINT "Number of points ";Num_points

200 PRINT

210 !

220 OUTPUT @Nwa;"STAR?;" ! Read in the start frequency

230 ENTER @Nwa;Start_f

240 PRINT "Start Frequency ";Start_f

250 PRINT

260 !

270 OUTPUT @Nwa;"AVERO?;" ! Averaging on?

1 2 ... 382 383 384 385 386 387 388 389 390 391 392 ... 545 546

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