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Chapter 3 73

HP-IB Command Guidelines

Guidelines for Operation

Changing HP-IB Units Use the UNITs command to change the

HP-IB Units setting for selected measurement or instrument setup

fields. Only the HP-IB units for power, relative level, and frequency

error can be changed. Table 3-2 lists the measurement and instrument

setup fields which have changeable HP-IB Units.

For example, the following BASIC language program statements

change the HP-IB Units for the TX Power measurement from W to dBm:

Example 3-27 Example

OUTPUT 714;"MEAS:RFR:POW:UNIT DBM"

Reading-Back HP-IB Units Use the UNITs? command to read back

the current HP-IB Units setting for a measurement or instrument

setup field. For example, the following BASIC language program

statements read back the current HP-IB Units setting for the TX Power

measurement:

Example 3-28 Example

!Query the current HP-IB Units setting for TX Power.

OUTPUT 714;"MEAS:RFR:POW:UNIT?"

!Enter the returned value into a string variable.

ENTER 714;A$

Table 3-2 HP-IB Units That Can Be Changed

Function Available HP-IB Units

TX Power measurement W or DBM

Adjacent Channel Power

LRATio, URATio DB or PCT

LLEVel, ULEVel W or DBM

SINAD measurement DB or PCT

DISTN measurement DB or PCT

SNR measurement DB or PCT

RF Generator Amplitude W or DBM or V or DBUV

Frequency Error HZ or PPM

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 328 329

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Agilent Technologies 8935 Series Manual do Utilizador Página 73