Agilent Technologies 8935 Series Manual do Utilizador descarregar pdf (Página 68)

68 Chapter 3

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

HP-IB Command Guidelines

Guidelines for Operation

Example 3-6 Example

RFAN:FREQ 850MHZ;:AFAN:INP ’FM DEMOD’

Using Question Marks to Query Setting or Measurement Fields

The question mark (?) is used to query (read-back) an instrument

setting or measurement value. To generate the query form of a

command, place the question mark immediately after the command.

Queried information must be read into the proper variable type within

the program context before it can be displayed, printed, or used as a

numeric value in the program.

Queried information is returned in the same format used to set the

value: queried numeric fields return numeric data; quoted string fields

return quoted string information.

For example, the following BASIC language program statements query

the current setting of the AFGen 1 To field:

Example 3-7 Example

!Query the AFGen1 To field

OUTPUT 714;"AFG1:DEST?"

!Enter queried value into a string variable.

ENTER 714;Afg1_to$

Specifying Units-of-Measure for Settings and

Measurement Results

Numeric settings and measurement results in the Test Set can be

displayed using one or more units-of-measure (V, mV,

V, H z, k H z ,

MHz…). When operating the Test Set manually, the units-of-measure

can be easily changed to display measurement results and field settings

in the most convenient format. HP-IB operation is similar to manual

operation in that the units-of-measure used to display numeric data can

be programmatically changed to the most convenient form.

NOTE

When querying measurements or settings through HP-IB, the Test Set

always returns numeric values in HP-IB Units or Attribute Units,

regardless of the current Display Units setting. Refer to “HP-IB Units

(UNITs)” on page 72 and “Attribute Units (AUNits)” on page 75 for

further information.

There are three sets of units-of-measure used in the Test Set: Display

Units,

HP-IB Units, and Attribute Units. Writing correct HP-IB programs

requires an understanding of how the Test Set deals with these

different sets of units-of-measure.

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