Agilent Technologies 4294A Service Manual download pdf (Page 101)

Chapter 7 101

Processing Measurement Results

Analyzing Measurement Results

1. Chapter Title

7. Processing 3. Chapter Title

4. Chapter Title

5. Chapter Title

Measurement Results

When you execute the “CALECPARA” command, the analysis results will be

automatically displayed. You can use the following command to select whether to display

these results on the screen.

• “DISECPARA” on page 299

Use the following command for query to read equivalent circuit analysis results (equivalent

circuit parameters: R1, C1, L1, C0).

• “DEFEC{R1|C1|L1|C0}” on page 296

You can use parameter values (R1, C1, L1, C0) obtained through equivalent circuit

analysis to perform frequency characteristic simulation for such values and display the

simulation results as memory trace. To do this, use the following command.

• “SIMFCHAR” on page 437

You can use the “DEFEC{R1|C1|L1|C0}” command (page 296) to specify the desired

value of each of the parameters R1, C1, L1, and C0. Therefore, you can display frequency

characteristics simulated based on desired parameter values.

Example 7-2 shows a sample equivalent circuit analysis program. This program is

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

This program performs a sweep once, selects equivalent circuit model E, performs

equivalent circuit analysis, and reads and displays the analysis results. This program also

performs frequency characteristic simulation based on parameter values obtained through

the analysis.

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

GPIB address.

Lines 90 to 110 Substitutes the sweep center value, the sweep span value, and the

selected equivalent circuit model into the corresponding variables

Cent, Span, and model$, respectively.

Lines 130 to 160 Resets the Agilent 4294A, sets impedance amplitude and phase as

measurement parameters, and sets the sweep center value and the

sweep span value to Cent and Span, respectively.

Lines 170 to 240 Performs a sweep once, performs auto scaling, and executes the auto

scale to automatically set the scale parameters so that the waveforms

fit on the screen.

Lines 250 to 260 Sets the selected equivalent circuit model to “Model$” and performs

equivalent circuit analysis.

Lines 270 to 400 Reads and displays equivalent circuit parameters R1, C1, L1, and C0.

Line 420 Performs frequency characteristic simulation.

Example 7-2 Equivalent Circuit Analysis

10 DIM Model$[9],Buff$[9]

20 REAL Cent,Span,R1,C1,L1,C0

30 IF SYSTEM$("SYSTEM ID")="HP4294A" THEN

40 ASSIGN @Hp4294a TO 800

50 ELSE

60 ASSIGN @Hp4294a TO 717

70 END IF

80 !

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Agilent Technologies 4294A Service Manual Page 101

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