Campbell-scientific CR800 and CR850 Measurement and Control Systems Manual de usuario Pagina 294
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Section 8. Operation
294
Other sensors, e.g., LVDTs (linear variable differential transformers), require an
ac excitation because they rely on inductive coupling to provide a signal. dc
excitation will provide no output.
CR800 bridge measurements can reverse excitation polarity to provide ac
excitation and avoid ion polarization.
Note Sensors requiring ac excitation require techniques to minimize or eliminate
ground loops. See Ground Looping in Ionic Measurements (p. 91).
8.1.3.2 Accuracy of Ratiometric-Resistance Measurements
The ratiometric-accuracy specification for resistance measurements is:
±(0.04%*V1+Offset),‐25°to50°C,
whereV1isthevoltagemeasurementandOffsetisequaltooneofthe
following,wheretheBasicResolutionistheresolutionofasingleA/D
(p.
425)
conversion.Notethatexcitationreversalreducesoffsetsbyafactor
oftwo:
• Offset = 1.5 x Basic Resolution + 1.0 µV if the measurement is made on a
differential input channel with input reversal
• Offset = 3 x Basic Resolution + 2.0 µV if the measurement is made on a
differential input channel without input reversal
• Offset = 3 x Basic Resolution + 3.0 µV if the measurement is of a single-
ended input channel
•
Thefollowingtablelistsbasicresolutionvalues.
Table 62. Analog Input-Voltage Range and Basic
Resolution
Range (mV) Basic Resolution (µV)
±5000
±2500
±250
±25
±7.5
±2.5
1333
667
66.7
6.7
2.0
0.67
Assumptions that support the ratiometric-accuracy specification include:
• Excitation voltages less than 1000 mV are reversed during the excitation
phase of the measurement.
- CR800 Measurement and 1
- Control System 1
- Warranty 3
- Assistance 5
- 2).................... 159 10
- List of Figures 18
- List of Tables 21
- ................ 1279H142 24
- Table of Contents 26
- Section 1. Introduction 27
- 4.1.1.1 Sensors 33
- 4.1.1.2 Datalogger 33
- 4.1.1.3 Data Retrieval 33
- 4.1.2.1 Wiring Panel 34
- Figure 2: Wiring panel 35
- 4.1.3 Sensors 36
- 4.1.3.2 Bridge Sensors 37
- 4.1.3.3 Pulse Sensors 38
- (p. 307) ) 39
- 4.1.3.4 RS-232 Sensors 40
- 4.1.4 Digital I/O Ports 42
- 4.1.5 SDM Channels 42
- 4.2.1 What You Will Need 43
- 4.2.2 Hardware Setup 43
- 4.2.3 PC200W Software Setup 44
- Section 5. System Overview 57
- 5.1 CR800 Datalogger 58
- 5.1.1 Clock 59
- 5.1.2 Sensor Support 59
- 5.1.3 CR800 Wiring Panel 60
- 5.1.3.2 Voltage Outputs 61
- 5.1.3.3 Grounding Terminals 62
- 5.1.3.4 Power Terminals 62
- 5.1.3.5 Communications Ports 63
- 5.1.5 Power Requirements 64
- 5.1.6 Programming 65
- (p. 315) 66
- (p. 505) ) 66
- 5.1.8 Data Retrieval 67
- 5.1.9 Communications 68
- 5.1.9.2 Modbus 69
- 5.1.9.3 DNP3 Communication 69
- 5.1.9.4 Keyboard Display 69
- 5.1.10 Security 70
- 5.1.10.1 Vulnerabilities 71
- 5.1.10.2 Pass-code Lockout 72
- 5.1.10.3 Passwords 73
- 5.1.10.4 File Encryption 74
- 5.1.11 Maintenance 75
- 5.1.11.3 Calibration 76
- 5.1.11.4 Internal Battery 76
- formoreinformation. 79
- Section 7. Installation 81
- 7.4 Power Sources 82
- 7.4.3 Power Supplies 83
- (p. 82) 84
- (p. 84) lists the 84
- (p. 312) 84
- to understand 85
- 7.5 Grounding 86
- 7.5.1.1 Lightning Protection 88
- (p. 86), use of a simple 89
- (p. 89) shows a simple 89
- 7.6 CR800 Configuration 92
- (p. 95) ) lists 94
- (p. 95), when the 94
- 7.6.3 Settings 96
- (p. 70) 99
- (p. 100), the 99
- 7.6.3.2 Settings via CRBasic 102
- 7.6.3.3 Durable Settings 103
- (p. 105) 105
- 7.6.3.5 Network Planner 107
- 7.7 Programming 108
- 7.7.1.2 CRBasic Editor 109
- 7.7.2 Sending Programs 110
- -Number of fields per record 111
- 7.7.3 Syntax 112
- 7.7.3.2 Structure 113
- Section 7. Installation 114
- 7.7.3.3 Command Line 115
- (p. 117) shows 117
- (p. 237) 118
- Zero Minimum Maximum 119
- Table 10. Data Types 120
- (p. 121) shows an example 121
- (p. 122) 122
- (p. 188) 122
- (p. 421) ) 122
- NextScan 123
- (p. 202) ) 124
- 7.7.3.5 Declared Sequences 125
- (p. 127). The data file 126
- (p. 126) 126
- (p. 127) 126
- (p. 149) for a list 127
- (p. 127), data 127
- (p. 130) ) 128
- (p. 269) 130
- (p. 127), three 130
- (p. 133) 132
- 2. Background calibration 134
- 4. Processing tasks 134
- 7.7.3.7 Execution Timing 135
- (p. 136): 136
- (p. 136), the scan is 136
- (p. 285) 137
- (p. 442) after complete 138
- (p. 310) 138
- 7.7.3.8 Instructions 139
- (p. 140) 140
- 7.7.3.9 Expressions 142
- TempF = TempC * 1.8 + 32 143
- (p. 147) demonstrate 146
- (p. 148) demonstrates 147
- 7.7.4 Tips 150
- 7.8.1.1 CAL Files 151
- 7.8.1.2 CRBasic Programming 152
- (p. 159) and Two Point 153
- (p. 431) menu commands to 154
- (p. 155) to the 155
- (p. 156) 156
- (p. 158) to the 158
- (p. 160) to the CR800 160
- (p. 161) to 161
- KnownWC = 0 162
- (p. 431) menu to delete 163
- (p. 164) as a program to 163
- (p. 164) sent to the 165
- (p. 165), keep the 249-kΩ 166
- (p. 167) 166
- 7.8.2 Information Services 167
- (p. 545) 168
- (p. 169), this page 168
- (p. 170) 169
- CRBasicExample32. HTML 171
- 7.8.2.4 FTP Server 172
- 7.8.2.5 FTP Client 172
- 7.8.2.6 Telnet 172
- 7.8.2.7 SNMP 172
- 7.8.2.8 Ping 172
- 7.8.3 SDI-12 Sensor Support 173
- (p. 174) 174
- (p. 179) summarizes CR800 179
- (p. 207) 184
- (p. 186) 185
- 7.8.4 Subroutines 188
- 7.8.5 Wind Vector 189
- 7.8.5.1 OutputOpt Parameters 190
- (p. 193) ) that 192
- 7.8.6 Custom Menus 194
- (p. 197) 195
- (p. 195) through Custom 197
- 7.8.8 Serial I/O 201
- 7.8.8.1 Introduction 202
- 7.8.8.2 I/O Ports 203
- 7.8.8.3 Protocols 203
- 7.8.8.4 Glossary of Terms 204
- 7.8.8.5 CRBasic Programming 205
- (p. 207) ). Data may be 209
- 8.1 °C" 210
- #01 84 cr 210
- Dim SerialInString As Long 210
- 7.8.8.6 Testing Applications 212
- (p. 216) imports 216
- (p. 382 216
- 7.8.8.7 Q & A 221
- Processing 223
- 7.8.10 NSEC Data Type 224
- 7.8.10.1 NSEC Options 225
- 7.8.11 Bool8 Data Type 228
- (p. 433) ). The CR800 232
- (p. 426) of 232
- (p. 233), summarizes the 232
- This is 237
- 7.8.13.1 String Operators 238
- 7.8.14 Data Tables 241
- (p. 60) ) 242
- 7.8.16 Program Signatures 243
- (p. 248) demonstrates: 248
- 7.8.17.5 Scaling Array 251
- 7.8.17.6 Conditional Output 252
- 7.8.17.7 Capturing Events 253
- 7.8.18 PRT Measurement 254
- (p. 260) for wiring diagram 260
- 0.025 V > (V 261
- * 115.54)/(9900+115.54) 261
- < 2.16 V 261
- BRFull() are 0.001 and 263
- 7.8.19 Running Average 264
- Section 8. Operation 269
- 8.1.2 Voltage 270
- 8.1.2.1 Input Limits 271
- 8.1.2.2 Reducing Error 272
- 8.1.2.3 Measurement Sequence 273
- Error, 274
- Error 275
- 8.1.2.5 Voltage Range 276
- (p. 276) ) 277
- 8.1.2.7 Integration 279
- (p. 280) and 280
- (p. 281) 281
- 8.1.2.8 Signal Settling Time 282
- (p. 108) 284
- (p. 278) 285
- COUNTS = G * Vin + B 286
- ±mV Input 287
- Section 8. Operation 288
- (p. 539) 291
- 8.1.3.1 ac Excitation 293
- (p. 91) 294
- 8.1.3.3 Strain Calculations 296
- 8.1.4 Thermocouple 297
- 8.1.5 Pulse 297
- (p. 538) for information 301
- (p. 303) 301
- (p. 303) 301
- (p. 304) lists 304
- (p. 306) footnote 306
- 8.1.6 Period Averaging 307
- 8.1.7 SDI-12 Recording 308
- 8.1.8 RS-232 and TTL 308
- 8.1.9 Field Calibration 309
- 8.1.10 Cabling Effects 309
- 8.1.10.3 RS-232 Sensors 310
- 8.1.10.4 SDI-12 Sensors 310
- , www.campbellsci.com, or 311
- 8.2.4 Control Outputs 312
- (p. 314) 313
- 8.2.6 TIMs 315
- 8.2.7 Vibrating Wire 315
- 8.2.8 Low-level ac 315
- 8.3.1 Storage Media 315
- Table 71. CR800 SRAM Memory 317
- 8.3.1.1 Data Storage 318
- (p.448) 321
- format. 322
- 8.3.2 Memory Conservation 323
- 8.3.3 Memory Reset 323
- 8.3.4 File Management 324
- 8.3.4.1 File Attributes 326
- 8.3.4.2 Data Preservation 326
- drive. The steps to copy 327
- (p. 431) feature. The 327
- Command,File,Device 328
- (p. 433) or 329
- 8.3.5 File Names 331
- 8.3.6 File System Errors 331
- 8.4.2 Protocols 333
- 8.5 PakBus Overview 334
- 8.5.1 PakBus Addresses 335
- (p. 335) ): 337
- 8.5.3.4 Neighbor Lists 338
- 8.5.3.5 Adjusting Links 338
- 8.5.3.6 Maintaining Links 338
- 8.5.4 PakBus Troubleshooting 339
- 8.5.4.3 Traffic Flow 340
- 8.5.6 PakBus LAN Example 341
- 8.5.6.2 LAN Setup 342
- 8.5.6.3 LoggerNet Setup 344
- (p. 345), set the 345
- 8.5.7 PakBus Encryption 346
- 8.6.1 DNP3 347
- (p.349), 348
- (p.349),line24. 348
- (p. 349), program the 349
- 8.6.2 Modbus 350
- 8.6.2.2 Terminology 351
- (p. 352) shows the 352
- 8.6.2.4 Troubleshooting 353
- 8.6.2.5 Modbus over IP 354
- 8.6.2.6 Modbus tidBytes 354
- 8.6.3 Web Service API 355
- 8.6.3.2 Command Syntax 356
- (p. 358) 357
- 8.6.3.3 Time Syntax 358
- 8.6.3.4 Data Management 358
- section 359
- (p. 358) section) 363
- (p. 358) for 363
- (p. 358) for format 363
- XML Response 365
- 8.6.3.5 Control 368
- 8.6.3.6 Clock Functions 370
- 8.6.3.7 Files Management 374
- (p. 76) Connect screen 375
- HTML page source: 379
- 8.7 Support Software 382
- 8.8.1 Data Display 385
- 8.8.1.2 Real-Time Custom 386
- Figure 116: Real-time custom 387
- 8.8.1.3 Final-Storage Tables 388
- 8.8.2 Run/Stop Program 389
- 8.8.3 File Display 390
- 8.8.3.1 File: Edit 391
- 8.8.4 Ports and Status 392
- 8.8.5 Settings 392
- 8.8.6 Configure Display 393
- Small program 2,600 1,113 395
- Large program 32,157 7,085 395
- Section 9. Maintenance 397
- Manufacturer Tadiran 398
- Model TL-5902S (3.6 V) 398
- Capacity 1.2 Ah 398
- 9.3 Repair 400
- Section 9. Maintenance 402
- Section 10. Troubleshooting 403
- 10.3.1.1 CompileResults 404
- 10.3.1.2 SkippedScan 405
- 10.3.1.3 SkippedSlowScan 405
- 10.3.1.4 SkippedRecord 405
- 10.3.1.5 ProgErrors 406
- 10.3.1.6 MemoryFree 406
- 10.3.1.7 VarOutOfBounds 406
- 10.3.1.8 WatchdogErrors 406
- 10.3.4 NAN and ±INF 408
- 10.4 Communications 411
- 10.4.3.2 CommsMemFree(2) 413
- 10.4.3.3 CommsMemFree(3) 413
- 10.5 Power Supplies 414
- 10.5.3.1 Battery Test 415
- 12V terminal and a G 417
- OFF and allow 417
- (p. 3) 418
- 419
- Section 10. Troubleshooting 420
- 10.6 Terminal Emulator 421
- (p. 422) 422
- Section 11. Glossary 425
- (p.436) 426
- (p.445). 428
- (p.545). 428
- (p.76)andtheappendix 429
- (p.547). 429
- (p.447). 429
- (p. 76) 431
- (p.518). 434
- (p.167)and 434
- (p. 545) ) to 436
- (p.438). 437
- Battery(BattV) 439
- (p.439). 440
- (p.449). 441
- inCR800measurement 442
- (p.76).A 445
- (p.546).Software 445
- (p.425)). 445
- (p.442). 445
- (p.427). 445
- ,formore 448
- 11.2 Concepts 449
- Section 11. Glossary 450
- Instructions 451
- (p.167). 452
- A.2 Data-Table Declarations 453
- A.2.2 Data Destinations 454
- A.2.3.1 Single-Source 455
- A.2.3.2 Multiple-Source 456
- A.5 Measurement Instructions 461
- A.5.2 Voltage 462
- A.5.3 Thermocouples 462
- BrHalf4W 463
- PulseCount 463
- A.5.7 Digital I/O 464
- SDI12SensorSetup 465
- Therm108 467
- Therm109 467
- SDMTrigger 470
- A.6.2 Arithmetic Operators 471
- A.6.3 Bitwise Operators 471
- (p. 473) 472
- A.6.5 Logical Operators 473
- A.6.6.1 Derived Functions 474
- A.6.6.2 Intrinsic Functions 474
- A.6.7 Arithmetic Functions 475
- A.6.8 Integrated Processing 477
- A.6.9 Spatial Processing 478
- A.6.10 Other Functions 479
- A.7 String Functions 480
- A.7.2 String Commands 481
- A.8 Clock Functions 483
- A.9 Voice-Modem Instructions 485
- NumBytes) 487
- Broadcast(ComPort, Message) 489
- A.13 Variable Management 492
- A.14 File Management 493
- A.16 Information Services 496
- NTPMaxMSec) 498
- A.17 Modem Control 499
- A.18 SCADA 499
- Mode, KnownVar, Index, Avg) 500
- A.20 Satellite Systems 501
- RInterval) 502
- A.21 User Defined Functions 503
- (p. 92) 505
- (p. 413) (see 506
- (p. 413) ) 506
- (p. 413) 513
- Each integration / range 516
- UTC. This offset is used in 518
- Table 118. CR800 Settings 519
- C.2.1 Pin-Out 527
- C.2.2 Power States 528
- Connections* 529
- Appendix E. FP2 Data Format 535
- Products 537
- F.2 Sensor Input Modules 538
- F.3 Cameras 540
- F.4 Control Output Modules 541
- F.5 Dataloggers 541
- F.6 Power Supplies 542
- F.6.2 Batteries 543
- F.6.3 Battery Bases 543
- F.6.4 Regulators 543
- F.7 Enclosures 544
- F.8.1 Keyboard Display 545
- F.8.3 Ethernet Link Devices 545
- F.8.4 Telephone 545
- F.9 Data Storage Devices 546
- F.10.3 Software Tools 548
- Table 157. Software Tools 549
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