Agilent Technologies 8935 Series Manual do Utilizador descarregar pdf (Página 118)

118 Chapter 6

O:\Manuals\E6380A_Progguid\Book\Advoper.fm

Advanced Operations

Increasing Measurement Throughput

Example 6-7 Example #3

OUTPUT 714;"ENC:AMPS:SAT:FM 2.35 KHZ;FREQ 5.970 KHZ"

This OUTPUT statement sets the AMPS SAT tone’s frequency and

deviation.

The semicolon separator tells the Test Set’s HP-IB command parser to

back up only one level of command hierarchy. The following OUTPUT

statement illustrates improper use of the semicolon separator.

Example 6-8 Example

OUTPUT 714;"RFG:MOD:EXT:DEST ’FM (/Vpk)’;AOUT ’DC’"

Trying to execute this OUTPUT statement would cause HP-IB

Error:-113 Undefined header. This is because the AOUT command

is two levels higher than the DEST 'FM (/Vpk)' command. See the

“RFGenerator Subsystem” in the HP-IB Syntax Reference Guide for the

command hierarchy.

The ;: (semicolon-colon) Separator. The ;: (semicolon-colon)

separator tells the Test Set’s HP-IB command parser that the next

command is at the top level of the command hierarchy. This allows

commands from different instruments to be output on one command

line. The following example illustrates proper use of the

semicolon-colon separator:

Example 6-9 Example

OUTPUT 714;"RFAN:FREQ 850 MHZ;:AFAN:INP ’FM DEMOD’"

This OUTPUT statement sets the RF Analyzer’s tune frequency to

850 MHz, and then sets the AF Analyzer’s input to FM Demod.

Compound Commands for Combining ENTER Statements

To reduce the number of ENTER statements used to read measured

values within one screen, string together multiple measure commands

within one OUTPUT statement followed by an ENTER statement with

the appropriate number of variables to hold the measured values. The

following example illustrates this technique.

Example 6-10 Example

OUTPUT 714;"MEAS:RFR:POW?;FREQ:ABS?"

ENTER 714;Power,Freq_abs

This OUTPUT statement requests an RF power and an absolute RF

frequency measurement. The ENTER statement then reads both values

into program variables.

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