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AM25T Solid State Multiplexer

Input locations within the measurement loops must be indexed (--), see

Instruction 87 in the datalogger manual. To index a location, using Edlog ver

6.0 or greater, move the cursor to the Input location label and press “F4”. To

index a location with the datalogger keyboard, press the “C” key when

entering the location number and before the “A” key is pressed.

TABLE 6-1. RTD Excitation Voltage and Measurement Range for AM25T

Multiplexers Prior to Serial Number 1839

Datalogger Temperature Range Excitation voltage Vs Range Vx Range

21X -40 to 85°C

-24 to 65°C

250 mV

350 mV

± 5 mV

± 500 mV

CR10(X) -40 to 85°C

-11 to 52°C

350 mV

250 mV

± 7.5 mV

± 2.5 mV

± 2500 mV

± 250 mV

CR7 -40 to 85°C 350 mV

± 15 mV ± 500 mV

TABLE 6-2. Wiring for CR10(X) Examples

Function AM25T CR10(X)

+12V Power 12 V 12 V

Power and Shield Ground

Clock CLK C1

Reset RES C2

RTD Excitation EX E1

Analog Ground AG AG

Common High HI 1H

Common Low LO 1L

Example 1. 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 Ports for 1 millisecond pulse

1: 9999 C8..C5 = nc/nc/nc/nc

2: 9933 C4..C1 = nc/nc/1ms/1ms

02: Do (P86) ;Turn On AM25T

1: 42 Set Port 2 High

03: Full Bridge (P6) ;Measure the output of the reference temp. full bridge

1: 1 Reps

2: 23 25 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 Excitation ;See Table 6-1 for older AM25T multiplexers

6: 1 Loc [ RefTemp_C ]

7: -0.001 Mult

8: 0.09707 Offset

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 35 36

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