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Programming Guide 1-33

ESG Family Signal Generators Preparing for Use

Getting Started with SCPI

Program Message Examples

The following parts of the signal generator SCPI command set will be used to demonstrate

how to create complete SCPI program messages:

:FREQuency

:POWER

Example 1

“FREQuency:STARt 500 MHz; STOP 1000 MHz”

The command is correct and will not cause errors. It is equivalent to sending the following:

“FREQuency:STARt 500 MHz; FREQuency:STOP 1000 MHz”

Example 2

“POWer 10 DBM; :OFFSet 5 DB”

This command results in a command error. The command makes use of the default

POWer[:LEVel][:IMMediate] node. When using a default node, there is no change to the

current path position. Since there is no command “OFFSet” at the root, an error results. A

correct way to send this is:

“POWer 10 DBM; :POWer:OFFSet 5 DB”

Example 3

“POWer:OFFSet 5 DB; POWer 10 DBM”

This command results in a command error. The POWer 10 DBM portion of the command is

missing a leading colon. The path level is dropped at each colon until it is in the

POWer:OFFSet subsystem.

When the POWer 10 DBM command is sent, it then causes confusion because no such node

occurs in the POWer:OFFSet subsystem. By adding a leading colon, the current path is

reset to the root. The correct command is:

“POWer:OFFSet 5 DB; :POWer 10 DBM”

Example 4

“FREQ 500 MHZ; POWER 4 DBM”

In this example the keyword short form is used. The command is correct. It utilizes the

default nodes of [:CW] and [:LEVEL]. Since default nodes do not affect the current path, it

is not necessary to use a leading colon before POWER.

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Agilent Technologies ESG Especificaciones Pagina 37