Agilent Technologies 3458A Guia do Utilizador Página 105
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Chapter 4 Making Measurements 105
Frequency or period measurements: The integration time does not affect
frequency or period measurements. For these measurements, the specified
resolution (which also selects gate time) has a major effect on the reading
rate. The specifications in Appendix A show reading rates for frequency and
period measurements based on the specified resolution.
Triggering Setup To ensure the fastest triggering configuration, set the trigger arm, trigger,
and sample events to AUTO, You can also use the TIMER sample event (or
the SWEEP command). Assuming you do not generate the TRIGGER TOO
FAST error, the reading rate is the reciprocal of the TIMER or SWEEP
interval.
Delay Time Under normal operation, the multimeter automatically determines a delay
time (default delay) based on the present measurement function, range,
resolution, and for AC measurements, the AC bandwidth setting. This delay
time is actually the settling time inserted before the first reading, which
ensures accurate readings. The default delay has a large affect on the reading
rate for analog AC measurements and a minimal affect on the reading rate
for sampled AC voltage or DC measurements. For analog AC measurements,
you can achieve a faster reading rate by specifying a shorter delay than the
default value. However, the resulting settling time may not produce accurate
measurements.
AC Bandwidth For the fastest AC measurements, specify the AC bandwidth (ACBAND
command) to match the frequency content of the input signal. The
specifications in Appendix A show the reading rates for AC measurements
based on the frequency components of the input signal.
Offset Compensation For 2- and 4-wire ohms measurements with offset compensation enabled, an
offset voltage measurement is made before each resistance reading. This
requires more time than with offset compensation disabled (OCOMP OFF).
High-Speed DCV
Example
The following program measures DC voltage at the fastest. possible rate (>
100k readings per second). The readings are stored in reading memory.
10 OUTPUT 722;"PRESET FAST" !DCV, 10V RANGE, TARM SYN, TRIG AUTO
20 OUTPUT 722;"APER 1.4E-6" !LONGEST INTEGRATION TIME POSSIBLE FOR
25 !>100K READINGS PER SECOND
30 OUTPUT 722;"MFORMAT SINT" !SINT MEMORY FORMAT
40 OUTPUT 722;"MEM FIFO" !ENABLE READING MEMORY
50 OUTPUT 722;"NRDGS 10000,AUTO !10000 READINGS/TRIGGER, AUTO SAMPLE EVENT
60 OUTPUT 722;"TARM SGL" !TRIGGER READINGS
70 END
High-Speed OHM (or
OHMF) Example
The following program measures 2-wire ohms at the fastest possible rate (>
100k readings per second). This program can be adapted to 4-wire ohms by
using the OHMF command instead of the OHM command in line 50.
10 OUTPUT 722;"PRESET FAST" !DCV 10V RANGE, TARM SYN, TRIG AUTO
20 OUTPUT 722;"APER 1.4E-6" !LONGEST INTEGRATION TIME POSSIBLE FOR
25 !>1OOK READINGS PER SECOND
30 OUTPUT 722;"MFORMAT SINT" !SINT MEMORY FORMAT
40 OUTPUT 722;"MEM FIFO" !ENABLE READING MEMORY
50 OUTPUT 722;"OHM 100E3" !2-WIRE OHMS, 100K(W) RANGE
60 OUTPUT 722;"NRDGS 10000,AUTO" !10000 READINGS/TRIGGER, AUTO SAMPLE EVENT
- Agilent Technologies 1
- 3458A Multimeter 1
- User’s Guide 1
- Safety Symbols 3
- WARNINGS 3
- Documentation History 3
- DECLARATION OF CONFORMITY 4
- Contents 7
- 8 Contents 8
- Contents 9 9
- 10 Contents 10
- Contents 11 11
- 12 Contents 12
- Introduction 15
- Initial Inspection 15
- Options and Accessories 16
- Installing the Multimeter 17
- Setting the Line 18
- Voltage Switches 18
- Installing the Line 18
- Power Fuse 18
- Connecting the GPIB 19
- Mounting the 20
- Multimeter 20
- Maintenance 21
- Chapter 2 Getting Started 23
- 24 Chapter 2 Getting Started 24
- Chapter 2 Getting Started 25
- Table 5. Power-On State 26
- Table 6. Display Annunciators 27
- Figure 6. Front Panel 27
- Making a 28
- Measurement 28
- Changing the 28
- Function 28
- Autorange and 29
- Manual Ranging 29
- Reading the Error 31
- Register 31
- Resetting the 32
- Using the 32
- Configuration Keys 32
- Installing the 41
- Keyboard Overlay 41
- Operating from Remote 42
- OUTPUT 722; "BEEP" 43
- OUTPUT 722;"ID?" 43
- 10 ENTER 722;A$ 43
- 20 PRINT A$ 43
- 10 ENTER 722;A 44
- 20 PRINT A 44
- General Configuration 47
- Registers 48
- °C from when 49
- Selecting the Input 50
- Terminals 50
- Suspending 51
- Presetting the 52
- Specifying a 53
- Table 12: DC Voltage Ranges 55
- Table 13: DC Current Ranges 56
- Table 14: Resistance Ranges 56
- 10MW 12.000000MW 1W 500nA 57
- 100MW 120.00000MW 10W 500nA 57
- 1GW 1.2000000GW 100W 500nA 57
- Configuring the A/D 58
- Converter 58
- • 1- 10 PLC in 1 PLC steps 59
- × 100 = 0.01 60
- Fixed Input 62
- Resistance 62
- Synchronous Sampling 63
- Conversion 63
- Random Sampling 64
- Specifying the AC 64
- Voltage Method 64
- Specifying 66
- Bandwidth 66
- When to Specify 69
- Using Subprogram Memory 71
- Executing a 72
- Subprogram 72
- Autostart 73
- Compressing 73
- Using State Memory 74
- Using the Input Buffer 75
- Using the Status Register 75
- Reading the Status 77
- Chapter 4 Making Measurements 79
- Triggering Measurements 81
- Table 20: Event Parameters 82
- Making Single 83
- Making Multiple 83
- Multiple Trigger 84
- Making Synchronous 84
- Making Timed 85
- Making Delayed 86
- External Trigger 88
- Buffering 88
- Table 21. Event Combinations 89
- Reading Formats 92
- Using Reading Memory 94
- 20 ENTER 722;A 96
- 30 PRINT A 96
- Using the SINT or 99
- DINT Output Format 99
- Using the SREAL 101
- Output Format 101
- Using the DREAL 101
- Increasing the Reading Rate 102
- Readings 103
- Configuring for Fast 103
- Integration Time and 104
- Resolution 104
- High-Speed Transfer 107
- Determining the 109
- Reading Rate 109
- The EXTOUT Signal 110
- Math Operations 116
- Table 23: Math Registers 117
- ·100 = 0.01 · 100 = 1 120
- Table 24: STAT Registers 122
- Measuring 125
- Temperature 125
- Chapter 5 Digitizing 127
- 128 Chapter 5 Digitizing 128
- Chapter 5 Digitizing 129
- Table 26: Digitizing Methods 130
- The Sampling Rate 131
- Level Triggering 132
- Chapter 5 Digitizing 133 133
- DCV Digitizing 134
- 136 Chapter 5 Digitizing 136
- Direct-Sampling 137
- Direct Sampling 138
- Sub-Sampling 139
- Fundamentals 140
- The Sync Source 141
- 142 Chapter 5 Digitizing 142
- Sending Samples to 144
- Chapter 5 Digitizing 145 145
- Viewing Sampled Data 146
- Chapter 5 Digitizing 147 147
- 148 Chapter 5 Digitizing 148
- Chapter 6 Command Reference 149
- Standard Query 153
- Commands 153
- Additional Query 153
- Commands by Functional Group 155
- ACDCI, ACDCV, ACI, ACV 159
- Syntax AUXERR? 161
- Auxiliary Error 161
- Conditions 161
- Syntax AZERO [control] 162
- • Related Commands: TONE 164
- Syntax CALNUM? 165
- COMPRESS 166
- Syntax CONT 167
- Syntax CSB 167
- DCI, DCV 168
- Syntax DEFKEY number,string 169
- Examples DEFKEY 170
- Syntax DELAY [time] 170
- DIAGNOST 171
- • Related Commands: NDIG 172
- Syntax EMASK [value] 174
- • Related Commands: OFORMAT 176
- Syntax ERR? 177
- Syntax ERRSTR? 178
- Syntax FIXEDZ [control] 180
- Syntax FSOURCE [source] 182
- Syntax ID? 186
- Syntax INBUF [control] 186
- Syntax ISCALE? 188
- Examples SINT Example 188
- Syntax LFILTER [control] 191
- Syntax LFREQ [frequency] 191
- Syntax LINE? 192
- • Related Commands: LFREQ 193
- Syntax MCOUNT? 196
- Syntax MEM [mode] 196
- Syntax MENU [mode] 198
- Syntax MFORMAT [format] 198
- • Related Commands: DISP 204
- 1 - 10 PLC in 1 PLC steps 205
- Syntax NRDGS [count][,event] 206
- Examples SYN Event 208
- • Related Commands: OHM, OHMF 209
- Syntax OFORMAT [format] 210
- Examples SINT Format 211
- DREAL Format 213
- • Related Commands: QFORMAT 214
- Syntax PAUSE 215
- TRIGGER 7 216
- Syntax PRESET [type] 217
- • Related Commands: RESET 219
- Examples NORM 220
- ARANGE ON 221
- WÿMAX, 10mW 223
- Syntax RATIO [control] 224
- Syntax RES [%_resolution] 225
- Syntax RESET 226
- • Related Commands: PRESET 227
- Syntax REV? 228
- Syntax RMATH [register] 228
- Syntax RQS [value] 230
- Syntax RSTATE [name] 231
- Examples Changing the Code 233
- Syntax SETACV [type] 233
- Syntax SLOPE [slope] 234
- !LEVEL DETECTION 235
- Syntax SRQ 236
- SSAC, SSDC 237
- Syntax SSPARM? 240
- Syntax SSRC [source][,mode] 241
- Syntax SSTATE name 244
- 30 PRINT A !PRINTS RESPONSE 245
- Syntax SUB name 246
- Syntax SUBEND 248
- Syntax T [event] 251
- Syntax TBUFF [control] 253
- Syntax TEMP? 254
- Syntax TERM [source] 254
- Syntax TEST 255
- Syntax TIMER [time] 255
- Syntax TONE 256
- Syntax TRIG [event] 256
- How It Works 261
- BASIC Language Commands 262
- BINIOR, BIT, ROTATE, SHIFT 263
- New Multimeter Commands 264
- Variables and Arrays 266
- Note PROGRAMMING HINT 267
- Variables for Data 268
- Reading Multimeter 268
- General Purpose Math 269
- Making Comparisons 272
- Subprograms 273
- Subprogram Command Types 275
- Execution 277
- Appendix A Specifications 281
- 282 Appendix A Specifications 282
- Appendix A Specifications 283
- 1 / DC Voltage 284
- 2 / Resistance 285
- 2 Accuracy 286
- 3 / DC Current 287
- 4 / AC Voltage 288
- Settling Characteristics 289
- 5 / AC Current 293
- 6 / Frequency/ Period 294
- 7 / Digitizing Specifications 295
- Voltage 296
- 8 / System Specifications 297
- 9 / Ratio 298
- 10 / Math Functions 298
- 11 / General Specifications 299
- Appendix B GPIB Commands 301
- 302 Appendix B GPIB Commands 302
- Appendix B GPIB Commands 303
- ABORT 7 (IFC) 304
- CLEAR (DCL or SDC) 304
- LOCAL (GTL) 304
- LOCAL LOCKOUT (LLO) 305
- SPOLL (Serial Poll) 306
- TRIGGER (GET) 307
- Rear Terminals and Guard 309
- Terminal Switches 309
- Front/Rear Terminals and 311
- Guard Terminal Switches 311
- Covers Removal 312
- Procedure 312
- Figure 36. 3458 Left side 313
- Figure 38. 3458 Rear view 314
- Switch Cap 316
- Installation 316
- Covers Installation 318
- Maximizing the Testing Speed 322
- Topics Covered in 323
- Optimizing 324
- Through the DCV 324
- DCV,20;RES.001 326
- AC Volts and AC Current 328
- Comparison of ACV 329
- Frequency and 330
- State Storage and 331
- Program Memory 331
- A Benchmark 333
- With the 3458A 347
- Digitizing Analog 350
- Using the DCV Path 351
- Capturing the Data 352
- [SWEEP 100E-9,4096] 354
- High Speed Data Transfers 355
- 1270 CALL Wfdgtz(1) 356
- Starter Main 357
- Errors in Measurements 358
- Figure 60. These 359
- Trigger and 361
- Timebase Errors 361
- INDEX 363 363
- 364 INDEX 364
- INDEX 365 365
- 366 INDEX 366
- INDEX 367 367
- 368 INDEX 368
- INDEX 369 369
- 370 INDEX 370
- INDEX 371 371
- 372 INDEX 372
- *03458-90014* 374
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