Campbell Scientific CR800 and CR850 Measurement and Control Systems User Manual
Page 13
Table of Contents
13
8.1.5.1.1 High-frequency Pulse (P1 - P2)................................ 300
8.1.5.1.2 Low-Level ac (P1 - P2) ............................................ 300
8.1.5.1.3 Switch Closure (P1 - P2) .......................................... 300
8.1.5.2 Pulse Input on Digital I/O Channels C1 - C4..................... 301
8.1.5.2.1 High Frequency Mode.............................................. 301
8.1.5.2.2 Low-Frequency Mode .............................................. 302
8.1.5.3 Pulse Measurement Tips .................................................... 302
8.1.5.3.1 Frequency Resolution............................................... 303
8.1.5.4 Pulse Measurement Problems ............................................ 305
8.1.5.4.1 Pay Attention to Specifications ................................ 305
8.1.5.4.2 Input Filters and Signal Attenuation......................... 305
8.1.5.4.3 Switch Bounce and NAN ......................................... 307
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
8.1.10.1 Analog Sensor Cables ...................................................... 309
8.1.10.2 Pulse Sensors ................................................................... 309
8.1.10.3 RS-232 Sensors................................................................ 310
8.1.10.4 SDI-12 Sensors ................................................................ 310
8.1.11 Synchronizing Measurements.................................................... 310
8.2 Measurement and Control Peripherals .................................................. 311
8.2.1 Analog-Input Expansion Modules............................................... 312
8.2.2 Pulse-Input Expansion Modules .................................................. 312
8.2.3 Serial-Input Expansion Modules ................................................. 312
8.2.4 Control Outputs ........................................................................... 312
8.2.4.1 Digital I/O Ports................................................................. 312
8.2.4.2 Relays and Relay Drivers................................................... 313
8.2.4.3 Component-Built Relays.................................................... 313
8.2.5 Analog Control / Output Devices ................................................ 314
8.2.6 TIMs ............................................................................................ 315
8.2.7 Vibrating Wire............................................................................. 315
8.2.8 Low-level ac ................................................................................ 315
8.3 Memory and Final Data Storage ........................................................... 315
8.3.1 Storage Media.............................................................................. 315
8.3.1.1 Data Storage....................................................................... 318
8.3.1.1.1 Data Table SRAM .................................................... 318
8.3.1.1.2 CPU: Drive ............................................................... 318
8.3.1.1.3 USR: Drive ............................................................... 318
8.3.1.1.4 USB: Drive ............................................................... 319
8.3.1.1.5 Data File Formats ..................................................... 319
8.3.2 Memory Conservation ................................................................. 323
8.3.3 Memory Reset ............................................................................. 323
8.3.3.1 Full Memory Reset............................................................. 323
8.3.3.2 Program Send Reset ........................................................... 324
8.3.3.3 Manual Data-Table Reset................................................... 324
8.3.3.4 Formatting Drives .............................................................. 324
8.3.4 File Management ......................................................................... 324
8.3.4.1 File Attributes .................................................................... 326
8.3.4.2 Data Preservation ............................................................... 326
8.3.4.3 External Memory Power-up............................................... 327
8.3.4.3.1 Creating and Editing Powerup.ini............................. 328
8.3.4.4 File Management Q & A.................................................... 330
8.3.5 File Names................................................................................... 331
8.3.6 File System Errors ....................................................................... 331