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Power Meter Remote Operation
Getting the Best Speed Performance
1-66 Agilent E4418B/E4419B Programming Guide
Getting the Best Speed Performance
This section discusses the factors that influence the speed of operation
(number of readings/sec) of an Agilent E4418B/E4419B power meter.
The following factors are those which have the greatest effect upon
measurement speed (in no particular order):
• The selected speed i.e. 20, 40 or 200 readings/sec.
• The trigger mode (for example, free run, trigger with delay etc.).
• The output format i.e. ASCii or REAL.
• The units used for the measurement.
• The command used to take a measurement.
In addition, in 200 reading/sec mode there are other influences which are
described in “200 Readings/Sec”, on page 1-68.
The following paragraphs give a brief description of the above factors and
how they are controlled from SCPI.
Speed
There are three possible speed settings 20, 40 and 200 readings/sec. These
are set using the SENSe:SPEed command and can be applied to each
channel independently (Agilent E4419B only). The speed setting controls
the cycle time of the measurement i.e., 50ms, 25ms and 5ms respectively.
In 20 and 40 readings/sec mode, full instrument functionality is available;
200 readings/sec is available only for E-series sensors and averaging,
offsets, limits, and ratio/difference math functions are disabled.
Refer to “Specifications” in chapter 5 of the User’s Guide to see the
influence of these speed settings on the accuracy and noise performance of
the power meter.
Trigger Mode
The power meter has a very flexible triggering system. For simplicity, it
can be described as having three modes:
prog.book Page 66 Thursday, June 7, 2001 2:55 PM
- Programming Guide 1
- Legal Information 3
- Limitation of Warranty 4
- Exclusive Remedies 4
- Equipment Operation 5
- General Safety Considerations 6
- IEC 1010-1 Compliance 7
- Statement of Compliance 7
- User Environment 7
- Installation Instructions 7
- About this Guide 8
- List of Related Publications 10
- Table of Contents 11
- Table System... 1-45 12
- List of Figures 23
- List of Tables 25
- Introduction 28
- Interface Selection 29
- GP-IB Address 29
- RS232/RS422 Configuration 30
- Calibration 37
- Making Measurements 40
- Using MEASure? 41
- Using the CONFigure Command 46
- Using READ? 47
- Using INITiate and FETCh? 47
- Overview 56
- TABLE 20 57
- Making the Measurement 65
- TABLE 10 67
- Resolution 74
- Averaging 74
- Setting Offsets 77
- Setting Measurement Limits 79
- Setting Window Limits 81
- Checking for Limit Failures 81
- Measuring Pulsed Signals 84
- Triggering the Power Meter 87
- Idle State 89
- Initiate State 90
- Event Detection State 90
- Trigger Delay 91
- Trigger Mode 92
- Output Format 94
- Command Used 94
- 200 Readings/Sec 94
- Dual Channel Considerations 95
- How to Use Registers 100
- Power Meter Remote Operation 101
- Status Reporting 101
- Status Register 105
- Device Status Register 113
- Example Program 117
- Syntax Conventions 121
- SCPI Data Types 121
- Input Message Terminators 127
- Quick Reference 128
- MEASurement Commands 129
- CALCulate Subsystem 130
- CALibration Subsystem 131
- DISPlay Subsystem 131
- FORMat Subsystem 131
- MEMory Subsystem 132
- OUTPut Subsystem 132
- [SENSe] Subsystem 133
- STATus Subsystem 134
- SYSTem Subsystem 135
- TRIGger Subsystem 135
- UNIT Subsystem 136
- SERVice Subsystem 136
- SCPI Compliance Information 137
- SYSTem:RWLock 138
- TRANsmit:ECHO 138
- UNIT[1 138
- MEASurement Instructions 139
- CONFigure[1 145
- FETCh[1 159
- READ[1 173
- MEASure[1 187
- Figure 3-1: CALCulate Block 203
- CALCulate Block 203
- SENSe1 Block 203
- SENSe2 Block 203
- The CALCulate[1 204
- on the 205
- enabled 207
- disabled 207
- CALCulate[1 208
- CALCulate[1 213
- Error Message 218
- Conflict” occurs 218
- The CALCulate[1 221
- CALibration[1 231
- CALibration[1 234
- DISPlay[:WINDow[1 248
- Query Example 250
- MEMory:CATalog Node 267
- MEMory:CATalog[:ALL]? 268
- MEMory:CATalog:STATe? 270
- MEM :CAT :STAT ? 270
- MEMory:CATalog:TABLe? 271
- MEMory:CLEar Node 273
- MEMory:CLEar:TABLe 275
- MEM :CLE :TABL 275
- The MEMory:FREE Node 276
- MEMory:FREE[:ALL]? 277
- MEM :FREE :ALL 277
- MEMory:FREE:STATe? 278
- :FREE :STAT ? 278
- MEMory:FREE:TABLe? 279
- MEM :FREE :TABL 279
- MEMory:NSTates? 280
- MEM :NST 280
- The MEMory:STATe Node 281
- MEMory:STATe:CATalog? 282
- MEM :STAT :CAT 282
- MEMory:TABLe Node 285
- 80 Frequency 80 290
- OUTput Subsystem 295
- SENSe Subsystem 303
- Number of Averages 309
- • Auto-averaging is disabled 312
- CSET2) table 319
- B for channel B 329
- value is set but the 330
- [:INPut][:MAGNitude]? 333
- is not affected 333
- <numeric_value> 334
- or the values 336
- B for channel A 336
- “Hardware missing” occurs 359
- Device Status Register Sets 369
- Operation Register Sets 370
- STATus:PRESet 378
- Questionable Register Sets 379
- RO 396
- SYSTem:ERRor? 410
- SYStem:LOCal 412
- Command Setting Comments 413
- Setting Comments 414
- SYSTem:REMote 416
- SYST :REM 416
- SYSTem:VERSion? 419
- ABORt[1 423
- INITiate Node 424
- TRIGger Node 428
- IEEE488.2 Command Reference 453
- Universal Commands 455
- *SRE <NRf> 471
- TTL outputs 1-55 481
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