Table of Contents
8.1.2.7.2 Voltage Measurement Mechanics ....................... 348
8.1.2.7.3 Voltage Measurement Quality ............................ 351
8.1.3 Pulse Measurements — Details ................................................ 369
8.1.3.1 Pulse Measurement Terminals ....................................... 372
8.1.3.2 Low-Level Ac Measurements — Details ...................... 372
8.1.3.3 High-Frequency Measurements ..................................... 373
8.1.3.3.1 Frequency Resolution ......................................... 374
8.1.3.3.2 Frequency Measurement Q & A ......................... 375
8.1.3.4 Switch Closure and Open-Collector Measurements ...... 375
8.1.3.5 Edge Timing .................................................................. 376
8.1.3.6 Edge Counting ............................................................... 377
8.1.3.7 Timer Input on I/O NAN Conditions ............................. 377
8.1.3.8 Pulse Measurement Tips ................................................ 377
8.1.3.8.1 Pay Attention to Specifications ........................... 379
8.1.3.8.2 Input Filters and Signal Attenuation ................... 380
8.1.4 Vibrating Wire Measurements — Details ................................ 382
8.1.4.1 Time-Domain Measurement .......................................... 382
8.1.5 Period Averaging — Details .................................................... 383
8.1.6 Reading Smart Sensors — Details ........................................... 384
8.1.6.1 RS-232 and TTL — Details ........................................... 384
8.1.6.2 SDI-12 Sensor Support — Details ................................. 385
8.1.7 Field Calibration — Overview ................................................. 385
8.1.8 Cabling Effects — Details ........................................................ 386
8.1.8.1 Analog Sensor Cabling .................................................. 386
8.1.8.2 Pulse Sensor Cabling ..................................................... 386
8.1.8.3 RS-232 Sensor Cabling .................................................. 386
8.1.8.4 SDI-12 Sensor Cabling .................................................. 386
8.1.9 Synchronizing Measurements — Details ................................. 387
8.1.9.1 Synchronizing Measurement in the CR800 —
Details ........................................................................ 387
8.1.9.2 Synchronizing Measurements in a Datalogger
Network — Details .................................................... 387
8.2 Switched-Voltage Output — Details ............................................... 388
8.2.1 Switched-Voltage Excitation .................................................... 389
8.2.2 Continuous-Regulated (5V Terminal) ...................................... 390
8.2.3 Continuous-Unregulated Voltage (12V Terminal) ................... 390
8.2.4 Switched-Unregulated Voltage (SW12 Terminal) ................... 391
8.3 PLC Control — Details ................................................................... 391
8.3.1 Terminals Configured for Control ............................................
392
8.4 Measurement and Control Peripherals — Details ........................... 393
8.4.1 Analog Input Modules .............................................................. 393
8.4.2 Analog Output Modules ........................................................... 394
8.4.3 PLC Control Modules — Overview ......................................... 394
8.4.3.1 Relays and Relay Drivers .............................................. 394
8.4.3.2 Component-Built Relays ............................................... 394
8.4.4 Pulse Input Modules ................................................................. 395
8.4.4.1 Low-Level Ac Input Modules — Overview .................. 395
8.4.5 Serial I/O Modules — Details .................................................. 396
8.4.6 Terminal-Input Modules .......................................................... 396
8.4.7 Vibrating Wire Modules ........................................................... 396
8.5 Datalogger Support Software — Details ......................................... 396
8.6 Program and OS File Compression Q and A ................................... 397
8.7 Security — Details .......................................................................... 400
8.7.1 Vulnerabilities .......................................................................... 401
8.7.2 Pass-Code Lockout ................................................................... 402
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