7.9.21.4 FTP Server ...................................................................... 294
7.9.21.5 FTP Client ....................................................................... 294
7.9.21.6 Telnet .............................................................................. 295
7.9.21.7 SNMP .............................................................................. 295
7.9.21.8 Ping (IP) .......................................................................... 295
7.9.21.9 Micro-Serial Server ......................................................... 295
7.9.21.10 Modbus TCP/IP ............................................................. 295
7.9.21.11 DHCP ............................................................................ 295
7.9.21.12 DNS .............................................................................. 296
7.9.21.13 SMTP ............................................................................ 296
7.9.22 Wind Vector ............................................................................. 296
7.9.22.1 OutputOpt Parameters ..................................................... 296
7.9.22.2 Wind Vector Processing .................................................. 297
7.9.22.2.1 Measured Raw Data .............................................. 298
7.9.22.2.2 Calculations ........................................................... 298
8. Operation .................................................................. 303
8.1 Measurements — Details ..................................................................... 303
8.1.1 Time Keeping — Details ............................................................ 303
8.1.1.1 Time Stamps ..................................................................... 303
8.1.2 Analog Measurements — Details ............................................... 305
8.1.2.1 Voltage Measurements — Details..................................... 305
8.1.2.1.1 Voltage Measurement Mechanics ............................ 305
8.1.2.1.2 Voltage Measurement Limitations .......................... 308
8.1.2.1.3 Voltage Measurement Quality ................................. 311
8.1.2.2 Thermocouple Measurements —- Details ......................... 327
8.1.2.2.1 Thermocouple Error Analysis ................................. 327
8.1.2.2.2 Use of External Reference Junction ........................ 336
8.1.2.3 Current Measurements — Details ..................................... 337
8.1.2.4 Resistance Measurements — Details ................................ 337
8.1.2.4.1 Ac Excitation ........................................................... 341
8.1.2.4.2 Resistance Measurements — Accuracy ................... 341
8.1.2.5 Strain Measurements — Details ........................................ 342
8.1.2.6 Auto-Calibration — Details .............................................. 344
8.1.2.6.1 Auto Calibration Process ......................................... 344
8.1.3 Pulse Measurements — Details .................................................. 349
8.1.3.1 Pulse Measurement Terminals .......................................... 352
8.1.3.2 Low-Level Ac Measurements — Details .......................... 352
8.1.3.3 High-Frequency Measurements ........................................ 353
8.1.3.3.1 Frequency Resolution .............................................. 353
8.1.3.3.2 Frequency Measurement Q & A .............................. 354
8.1.3.4 Switch-Closure and Open-Collector Measurements ......... 355
8.1.3.5 Edge Timing ...................................................................... 355
8.1.3.6 Edge Counting .................................................................. 356
8.1.3.7 Pulse Measurement Tips ................................................... 356
8.1.3.7.1 TimerIO() NAN Conditions .................................... 359
8.1.3.7.2 Input Filters and Signal Attenuation ........................ 359
8.1.4 Period Averaging — Details ....................................................... 360
8.1.5 Vibrating-Wire Measurements — Details .................................. 361
8.1.5.1 Time-Domain Measurement ............................................. 362
8.1.6 Reading Smart Sensors — Details .............................................. 362
8.1.6.1 RS-232 and TTL ............................................................... 362
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