Agilent Technologies 4294A Service Manual download pdf (Page 98)

98 Chapter 7

Processing Measurement Results

Reading Measurement Data at Specific Measurement Points (Using the

Marker Function)

Reading the marker-specified value

Use the following commands to read the marker-specified measurement or sweep

parameter value.

You can use the following command to display a list of all marker-specified values on the

Agilent 4294A LCD. Note, however, that you cannot use these commands to read these

values.

• “MKRL” on page 352

Sample program for using the marker function

Example 7-1 shows a sample program for using the marker function. This program is

available under the filename of “marker.bas” on the sample program disk.

This program performs sweep once, uses the marker function to search for the maximum

peak and the minimum negative peak in the 10-100 MHz range, provides a submarker at

each of these peaks, and reads and displays the submarker-specified values.

Lines 30 to 70 Identifies the external controller and Instrument BASIC and sets the

GPIB address.

Lines 90 to 110 Substitutes the lower and upper border values for the search range and

the trace selected as the active trace into the corresponding variables

Sear_min$, Sear_max$, and Act_trc$, respectively.

Lines 130 to 160 Resets the Agilent 4294A, performs a sweep once, and waits for the

sweep to be completed.

Lines 180 to 190 Sets the trace selected as the active trace to Act_trc$ and executes the

auto scale to automatically set the scale parameters so that the

waveforms fit on the screen.

Lines 210 to 240 Turns ON the marker and sets the lower and upper border values for

the search range to Sear_min$ and Sear_max$, respectively.

Lines 260 to 300 Defines the peak by specifying “0.1/1e6” and “positive” as peak slope

threshold and peak polarity, searches for the peak and moves the

marker to that peak, and positions submarker 1 at the peak.

Lines 320 to 340 Redefines the peak by specifying “negative” as peak polarity, searches

Measurement Parameter

Value

Supplementary Reading for

Measurement Parameter

Value (Vector)

Sweep Parameter Value

Marker “OUTPMKR?” on page 387

“MKRVAL?” on page 360 “MKRAUV?” on page 351 “MKRPRM” on page 358

Used for query

Submarker “OUTPSMKR{1-7}?” on page 393

“SMKRVAL{1-7}?” on

page 441

“SMKRAUV{1-7}?” on page

438

“SMKRPRM{1-7}” on page 440

Used for query

Δ Marker “OUTPDMKR?” on page 377

“DMKRVAL” on page 306

Used for query

“DMKRAUV” on page 303

Used for query

“DMKRPRM” on page 305

Used for query

*1.You can read parameter values only when you use the fixed Δ marker.

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Agilent Technologies 4294A Service Manual Page 98

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