Agilent Technologies E7401A

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3 Programming Examples

This chapter includes examples of how to program the analyzer using the analyzer

SCPI programming commands. Twelve examples are written for an analyzer with

an GPIB interface (Option A4H). Three examples are written for an analyzer with

an RS-232 interface (Option 1AX).

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Safety Information2
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Creating Valid Commands39
Command Notation Syntax40
Special Characters in Commands41
Parameters in Commands42
Improving Measurement Speed45
Select Phase Noise Performance46
Avoid Unnecessary Use of *RST47
Putting Multiple Commands on the same Line48
Overview of GPIB (Option A4H)50
Overview of RS-232 (Option 1AX)52
Modem Line Handshaking53
Printer Setup and Operation54
Testing Printer Operation56
Status Registers57
Use Status Registers to Determine the State of Analyzer Events and Conditions58
What Are the Status Registers59
How Do You Access the Status Registers61
Using the Service Request (SRQ) Method63
Setting and Querying the Status Register65
Status Byte Register66
Service Request Enable Register67
Standard Event Status Register68
Standard Event Status Event Enable Register70
Status:operation Condition and Event Enable Registers73
Status:questionable:power Register76
Questionable Status Event Enable Register77
Questionable Status Power Condition and Event Registers79
Status:questionable:frequency Register80
Questionable Status Frequency Condition and Event Enable Registers82
Status:questionable:calibration Register83
Status:questionable:integrity:uncalibrated Register86
Questionable Status Calibration Condition and Event Enable Registers87
Questionable Status Integrity Uncalibrated Condition and Event Enable Registers88
Status:questionable:integrity Register89
Questionable Status Integrity Event Condition and Enable Registers91
Programming Examples93
List of Programming Examples94
Programming Examples System Requirements95
C Programming Examples Using VTL96
Linking to VTL Libraries97
Example Program99
Opening a Session100
Addressing a Session102
Closing a Session103
Using Marker Peak Search and Peak Excursion104
Using Marker Delta Mode and Marker Minimum Search108
Performing Internal Self-Alignment112
Reading Trace Data Using ASCII Format (GPIB)116
Real Format (GPIB)120
Using Limit Lines135
Measuring Noise141
Entering Amplitude Correction Data145
Status Register–Determine When a Measurement Is Done149
Determine if an Error Has Occurred155
Measuring Harmonic Distortion (GPIB)161
Measuring Harmonic Distortion (RS-232)169
Making Faster Measurements (Multiple Measurements)177
Functional Index to SCPI Subsection186
SCPI Sections and Subsections191
IEEE Common Commands193
Standard Event Status Register Query194
Operation Complete195
Reset196
Trigger197
Abort Subsystem198
Calculate Subsystem199
Ndbstate200
Calculate:emi:slist Subsection201
Clear Marks204
Set Comment for Signals205
Turn Signal List on or off206
Position Cursor to Signal List207
Specify Signal List Display Parameters208
Calculate:lline Subsection209
Set Limit Line X-Axis Units210
Control Limit Line Frequency Interpolation211
Merge Additional Values into the Existing Limit Line213
Test the Data against the Limit Line214
Control Limit Line Testing215
Calculate:marker Subsection216
Frequency Counter Marker Automatic Resolution217
Marker Peak (Maximum) Search218
Marker Peak (Maximum) Right Search219
Define Peak Excursion220
Define Peak Threshold221
Set Span to the Marker Value222
Marker Table On/Off223
Marker X Value224
Span Markers Center Frequency X Position225
Delta Pair Markers Stop Frequency X Position226
Delta Pair Markers Start Frequency X Value227
Calculate:ntdata Subsection228
Calibration Subsystem229
Automatic Alignment230
Coarse Adjust the Frequency Reference231
Select the Source State for Calibration232
Couple Subsystem233
Display Subsystem235
Display Annotation Title Data236
Window Annotation237
Display Line Amplitude238
Normalized Reference Level239
Trace Y-Axis Amplitude Scaling240
Trace Y-Axis Reference Level Offset241
Vertical Axis Scaling242
Format Subsystem243
Hcopy Subsystem245
Select a Signal List to Include in a Report246
Print a Hard Copy247
Printed Page Size248
Initiate Subsystem249
Take New Data Acquisitions250
Restart the Measurement251
Input Subsystem252
Clear the Input Overload253
Measure Group of Commands254
Fetch Commands255
Read Commands256
Get Measurement Results257
Measure at Marker258
Measure Peaks259
Mmemory Subsystem260
Move Data to File261
Load an Instrument State from a File262
Make a Directory263
Delete a Directory264
Store a Limit Line in a File265
Mmemory:store:trace <Label>,<File_Name266
Output Subsystem267
Sense Subsystem268
Sense]:Average Subsection269
Turn Automatic Averaging On/Off270
Type of Averaging for Measurements271
Sense]:Bandwidth Subsection272
Video Bandwidth273
Resolution Bandwidth Type275
Sense]:Correction Subsection276
Merge Additional Values into the Existing Amplitude Correction Data277
Delete Amplitude Correction278
Input Impedance Correction279
Sense]:Demod Subsection280
Demodulation Control281
Sense]:Detector Subsection282
Type of Detection284
Type of EMI Detector285
EMI View286
Sense]:Emi Subsection287
Setting the Dwell Time for Peak288
Setting the Dwell Time for Range289
Sense]:Frequency Subsection290
Center Frequency Step Size291
Full Frequency Span292
Stop Frequency293
Frequency Synthesis State294
Sense]:Power Subsection295
Input Port Power Gain296
Preselector Center297
Sense]:Sweep Subsection298
Sweep Time299
Sweep Time Mode300
Time Gate Level (Option 1D6 Only)301
Time Gate Trigger Type (Option 1D6 Only)302
Source Subsystem303
Automatic Source Attenuation304
Sets the Source Output Power Mode305
Set the Output Power at the Start of the Sweep306
Set the Source Sweep Power Range307
Status Subsystem308
Operation Negative Transition309
Status:questionable Subsection310
Questionable Calibration Negative Transition311
Questionable Enable312
Questionable Frequency Enable313
Questionable Frequency Positive Transition314
Questionable Integrity Negative Transition315
Questionable Integrity Uncalibrated Event Query316
Questionable Negative Transition317
Questionable Power Negative Transition318
System Subsystem319
Serial Port RTS Setup320
Serial Port Receive Pace Setup321
System Configuration Query322
Locate SCPI Command Errors323
License Key – Install Application/Option324
Power on Elapsed Time325
Preset326
Save User Preset327
Trace Subsystem328
Exchange Traces329
Mean Trace Data330
Number of Points for Smoothing332
Trace Math Subtract from Display Line333
Trigger Subsystem334
Trigger Offset335
Trigger Source336
Video Trigger Level Frequency337
UNIT Subsystem338

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