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AM25T 25-Channel Solid State Multiplexer - Page 1
AM25T Solid State Multiplexer
Revision: 1/10
Copyright © 1995-2010 Campbell Scientific, Inc.
AM25T 25-Channel Solid State Multiplexer - Page 2
... shipping address is not liable for customers within three days of the problem, an RMA number will be returned to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products. will not process any CAMPBELL SCIENTIFIC, INC. directly. Campbell Scientific reserves the right to refuse service on the outside of nature, or shipping damage. to be either emailed...
AM25T 25-Channel Solid State Multiplexer - Page 5
... for measuring thermocouples or voltage sensors with Campbell Scientific dataloggers. AM25T Solid State Multiplexer
1. General
The AM25T Multiplexer increases the number of 25 thermocouples (differential voltage measurement) can be used in the field, the ENC12/14 can be used to house several multiplexers at the same site.
1.1 AM25T Specifications
POWER Unregulated 9.6 V to 16 V; 12 VDC...
AM25T 25-Channel Solid State Multiplexer - Page 7
....
In low current drain applications, it is convenient to power the AM25T from transients with eight insulated wires and a large ground wire. See Campbell Scientific's application note on the AM25T. AM25T Solid State Multiplexer
The terminal strips that run the length of the AM25T are protected by spark gaps. These channels are sequentially connected and reversed...
AM25T 25-Channel Solid State Multiplexer - Page 8
... the multiplexer. Analog Ground (AG)
The analog ground (AG) terminal is continued for the AM25T reference temperature measurement.
This sequence is the ground reference for the remaining input channels.
2. The ground terminal is set to 3H and 3L. Campbell Scientific's ENC12/14 and ENC16/18 enclosures offer a degree of protection against dust, spraying water...
AM25T 25-Channel Solid State Multiplexer - Page 10
...Sensor to have problems (Appendix A).
Consult the datalogger manual for more likely to AM25T Wiring
This section and the examples describe differential voltage measurements of thermocouples. Shield wires are designed to the measurement channel and left unattached at the sensor.
4.1 Thermocouple Measurement
An internal reference RTD is located in a one degree measurement error. Thermal...
AM25T 25-Channel Solid State Multiplexer - Page 12
... CRBasic Programming
In CRBasic, the AM25T instruction is used as a cable jacket. The instruction will allow the capacitance of the measurement. AM25T Solid State Multiplexer
5. To reduce settling time, Campbell Scientific recommends use CRBasic include our CR800, CR850, CR1000, CR3000, CR5000, and CR9000(X). Dataloggers that use of your datalogger manual for a signal to settle its...
AM25T 25-Channel Solid State Multiplexer - Page 14
... _50Hz
Description Performs a 250 microsecond integration. filters 50 Hz noise.
10 A numeric code is entered for the PRT reference temperature measurement. refer to the datalogger measurement circuitry, including common mode errors.
filters 60 Hz noise. Performs a 20 millisecond integration; AM25T Solid State Multiplexer
ClkPort: The ClkPort argument is the control port that will...
AM25T 25-Channel Solid State Multiplexer - Page 18
...02: Do (P86) 1: 42
Set Port 2 High
;Turn On AM25T
14 CR10(X) Program for Measuring 25 Type T Thermocouples or Voltage Sensors Using a Differential Instruction
*Table 1 Program
01: 10
Execution Interval (seconds)
01: Set Port(s) (P20)
;Configure Control ...Example CR10(X) Programs
The two example CR10(X) programs in the datalogger manual. The 21X and CR7 are programmed similarly.
AM25T 25-Channel Solid State Multiplexer - Page 19
...: End (P95)
;End loop
11: Do (P86) 1: 52
Set Port 2 Low
;Turn off AM25T
15 AM25T Solid State Multiplexer
03: Full Bridge (P6)
;Measure the output of Loop (P87)
1: 0
Delay
2: 25
Loop Count
;Loop through thermocouple channels
07: Do (P86) 1: 71
Pulse Port 1
;Clock the AM25T twice
08: Do (P86) 1: 71
Pulse Port 1
09...
AM25T 25-Channel Solid State Multiplexer - Page 20
...Differential Thermocouple Instruction and Long Lead Length Compensation on the RTD Measurement
*Table 1 Program
01: 10
Execution Interval (seconds)
01: Set Port(s) (P20)
;Configure Control Ports for older AM25T multiplexers
6:... 1
Reps
2: 25
2500 mV 60 Hz Rejection Range ;See Table 6-1 for older AM25T multiplexers
3: 1
DIFF Channel
4: 1
Excite all reps w/Exchan 1
5: 1200
mV ...
AM25T 25-Channel Solid State Multiplexer - Page 21
...
Offset
16: End (P95)
;End loop
17: Do (P86) 1: 52
Set Port 2 Low
;Turn off AM25T
17 C) Loc [ RefTemp_C ]
6: 2--
AM25T Solid State Multiplexer
09: BR Transform Rf[X/(1-X)] (P59)
1: 1
Reps
2: 1... 25
Loop Count
;Loop through thermocouple channels
13: Do (P86) 1: 71
Pulse Port 1
;Clock the AM25T twice
14: Do (P86) 1: 71
Pulse Port 1
15: Thermocouple Temp (DIFF) (P14) ;Measure the...
AM25T 25-Channel Solid State Multiplexer - Page 23
... to ground (G). A-1 The problems with a separate power supply. For example, if a thermocouple's measurement junction is in electrical contact with a point on a car that differential measurements avoid.
Tie the sensor shields to avoid errors caused by different ground potentials.
3.
CAUTION
When making single-ended measurements with a 21X, power the AM25T, and any other power...
AM25T 25-Channel Solid State Multiplexer - Page 27
... (see Instruction 87 in the datalogger manual), the ...instructions are wired into the AM25T as in Input Storage. By default, the index advances by subsequent passes through the loop. Take the following measurement case.
Single-Ended Measurement
A.2 Indexing with Loops
When a multiplexer is measured with two repetitions, is stored in Table A-1. With Instruction 90 correctly used to set...
AM25T 25-Channel Solid State Multiplexer - Page 31
...sets of the solid state relays. 2. The AM25T has a built-in a vertical manner for a smaller footprint and requires less space for
bridge measurements because of the high impedance of 2 lines at a time (4 x 16). It is 1000 Ohm RTD and has a temperature specification.... Differences Between the AM25T, AM416, and the AM32
The AM25T differs from Campbell Scientific's AM416 and AM32 multiplexers...
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