Campbell Scientific CR1000 Measurement and Control System - Manual (Page 12)

Table of Contents
12
7.8.13.4 Inserting String Characters............................................... 239
7.8.13.5 Extracting String Characters ............................................ 239
7.8.13.6 String Use of ASCII / ANSII Codes ................................ 239
7.8.13.7 Formatting Strings............................................................ 240
7.8.13.8 Formatting String Hexadecimal Variables ....................... 240
7.8.14 Data Tables ................................................................................ 240
7.8.15 PulseCountReset Instruction...................................................... 241
7.8.16 Program Signatures.................................................................... 242
7.8.16.1 Text Signature .................................................................. 242
7.8.16.2 Binary Runtime Signature................................................ 242
7.8.16.3 Executable Code Signatures............................................. 242
7.8.17 Advanced Programming Examples............................................ 243
7.8.17.1 Miscellaneous Features .................................................... 243
7.8.17.2 Running Average and Total of Rain................................. 246
7.8.17.3 Use of Multiple Scans ...................................................... 246
7.8.17.4 Groundwater Pump Test................................................... 247
7.8.17.5 Scaling Array ................................................................... 250
7.8.17.6 Conditional Output........................................................... 251
7.8.17.7 Capturing Events.............................................................. 252
7.8.18 PRT Measurement ..................................................................... 253
7.8.18.1 PRT Calculation Standards .............................................. 253
7.8.18.2 Measuring PT100s (100-Ohm PRTs)............................... 257
7.8.18.2.1 Self-Heating and Resolution................................... 257
7.8.18.2.2 PT100 in Four-Wire Half-Bridge ........................... 257
7.8.18.2.3 PT100 in Three-Wire Half-Bridge.......................... 259
7.8.18.2.4 PT100 in Four-Wire Full-Bridge ............................ 261
7.8.19 Running Average ....................................................................... 263
7.8.20 Writing High-Frequency Data to CF ......................................... 266
7.8.20.1 TableFile() with Option 64............................................... 266
7.8.20.2 TableFile() with Option 64 Replaces CardOut() .............. 267
7.8.20.3 TableFile() with Option 64 Programming........................ 267
7.8.20.4 Converting TOB3 Files with CardConvert....................... 268
7.8.20.5 TableFile() with Option 64 Q & A................................... 268
Section 8. Operation .....................................................273
8.1 Measurements ....................................................................................... 273
8.1.1 Time............................................................................................. 273
8.1.1.1 Time Stamps ...................................................................... 273
8.1.2 Voltage ........................................................................................ 274
8.1.2.1 Input Limits........................................................................ 275
8.1.2.2 Reducing Error................................................................... 276
8.1.2.3 Measurement Sequence...................................................... 277
8.1.2.4 Measurement Accuracy...................................................... 278
8.1.2.5 Voltage Range.................................................................... 280
8.1.2.5.1 AutoRange................................................................ 280
8.1.2.5.2 Fixed Voltage Ranges............................................... 281
8.1.2.5.3 Common Mode Null / Open Input Detect................. 281
8.1.2.6 Offset Voltage Compensation ............................................ 282
8.1.2.6.1 Input and Excitation Reversal................................... 282
8.1.2.6.2 Ground Reference Offset Voltage ............................ 283
8.1.2.6.3 Background Calibration............................................ 283
8.1.2.7 Integration .......................................................................... 283
8.1.2.7.1 ac Power Line Noise Rejection................................. 284
8.1.2.8 Signal Settling Time........................................................... 286
8.1.2.8.1 Minimizing Settling Errors ....................................... 287