Campbell Scientific AM25T 25-Channel Solid State Multiplexer - Manual (Page 4)

AM25T Solid State Multiplexer Table of Contents
ii
Figures
1. AM25T Thermocouple Multiplexer........................................................... 3
2. External Battery Connections .................................................................... 6
3. Differential Measurement of Type T Thermocouple ................................. 7
4. Differential Voltage Measurement............................................................. 7
A-1. Single-Ended Measurement of a Type T Thermocouple ................... A-2
A-2. Single-Ended Measurement............................................................... A-5
Tables
3-1. Datalogger to AM25T Wiring ................................................................ 5
6-1. Wiring for CR1000 Example 1............................................................. 11
6-2. Wiring for CR1000 Example 2............................................................. 12
6-3. RTD Excitation Voltage and Measurement Range for AM25T
Multiplexers Prior to Serial Number 1839 ........................................ 14
6-4. Wiring for CR10(X) Examples............................................................. 14
6-5. Wiring for CR23X Example................................................................. 18
A-1. Values in Input Storage; Input Location Not Indexed....................... A-5
A-2. Values in Input Storage; with Input Location Index and without
Step Loop Index Instruction............................................................ A-6
A-3. Values in Input Storage; with Input Location Index and Step
Loop Index Instruction .................................................................... A-6
Program Examples
1. CR1000 Program Using One Instruction to Measure Both the
Reference Temperature and Thermocouples..................................... 11
2. CR1000 Program that Uses Separate AM25T Instructions to
Measure the PRT and Thermocouples .............................................. 12
3. CR10(X) Program for Measuring 25 Type T Thermocouples or
Voltage Sensors Using a Differential Instruction.............................. 14
4. CR10(X) Program for Measuring 25 Type T Thermocouples with
the Differential Thermocouple Instruction and Long Lead
Length Compensation on the RTD Measurement ............................. 16
5. CR23X Program for Measuring 25 Type T Thermocouples.................... 18
A-1. CR10 Program for Measuring 50 Type T Thermocouples or
Voltage Sensors Using a Single-Ended Instruction......................... A-2
A-2. 21X Program for Measuring 50 Type T Thermocouples or
Voltage Sensors Using Single-Ended Instruction .......................... A-3
A-3. Single-Ended Thermocouples, Input Location Not Indexed ............. A-6
A-4. Measuring Single-Ended Thermocouples with the Input
Location Indexed and no Step Loop Index ..................................... A-7
A-5. Measuring Single-Ended Thermocouples with the Input
Location Indexed and Step Loop Index ......................................... A-7