Campbell AM25T Specifications Page 12
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AM25T Solid State Multiplexer
5. General Measurement Considerations
Cables have additional capacitance that increases the time required for a signal
to settle its true value. To reduce settling time, Campbell Scientific
recommends use of Teflon, polyethylene, or polypropylene insulation around
individual conductors. Do not use PVC as conductor insulation. PVC may be
used as a cable jacket.
With long lead lengths, a delay within the measurement instruction will allow
the capacitance of the lead wires to discharge before the measurement is made.
Consult the Measurement Section of your datalogger manual for more
information.
6. Datalogger Programming
The datalogger is programmed using either CRBasic or Edlog. Dataloggers
that use CRBasic include our CR800, CR850, CR1000, CR3000, CR5000, and
CR9000(X). Dataloggers that use Edlog include our CR10(X), 21X, CR23X,
and CR7. Both CRBasic and Edlog are included in PC400 and LoggerNet.
6.1 CRBasic Programming
In CRBasic, the AM25T instruction is used to control the AM25T Multiplexer
with the datalogger. The instruction will automatically measure the PRT
incorporated in the AM25T and use it as a reference temperature for
thermocouple measurements.
Syntax
AM25T (Dest, Reps, Range, AM25TChan, DiffChan, TCType, TRef, ClkPort,
ResPort, ExChan, RevDiff, SettlingTime, Integ, Mult, Offset)
Datalogger
The AM25T instruction has the following parameters:
Dest: The Dest parameter is a variable in which to store the results of the
measurement.
Reps: The Reps parameter is the number of times the measurement should be
made. Measurements are made on consecutive channels. If the Reps parameter
8
- AM25T Solid State Multiplexer 1
- Warranty and Assistance 2
- Table of Contents 3
- Figures 4
- Program Examples 4
- 1. General 5
- 1.2 Physical Description 6
- 1.3 Operation 7
- 2. Installation 8
- 4. Sensor to AM25T Wiring 10
- 4.3 Mixed Sensor Types 11
- Datalogger 12
- 6.2 Edlog Programming 17
- 6.2.2 Example CR23X Program 22
- Appendix A. Single-Ended 23
- Measurements 23
- A.2 Indexing with Loops 27
- AM25T, AM416, and the AM32 31
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