Specifications

AM25T Solid State Multiplexer

Mult, Offset: The Mult and Offset parameters are each a constant, variable,

array, or expression by which to scale the results of the measurement. With a

multiplier (mult) of 1 and an offset of 0, the output is in degrees Celsius.

The AM25T instruction must NOT be placed in a conditional

statement when running in pipeline mode.

NOTE

6.1.1 Example CRBasic Programs

Both CRBasic example programs are written for CR1000 dataloggers. Other

CRBasic dataloggers are programmed similarly.

6.1.1.1 CR1000 Example Program 1

In this example, 25 type T thermocouples are connected to the AM25T. One

AM25T instruction will measure the AM25T’s PRT and the thermocouples.

Table 6-1 shows the wiring used with the example.

TABLE 6-1. Wiring for CR1000 Example 1

Function AM25T CR1000

+12V Power 12 V 12 V

Power and Shield Ground Gnd Gnd

Clock CLK C5

Reset RES C4

RTD Excitation EX EX1

Common High HI 1H

Common Low LO 1L

Example 1. CR1000 Program Using One Instruction to Measure Both the Reference

Temperature and Thermocouples

‘Declare Public Variables

Public Tref

Public TC (25)

‘Define Data Tables

DataTable (Dat15sec,1,-1)

DataInterval (0,15,Sec,10)

Sample (1,Tref,IEEE4)

Sample (25,TC(1),IEEE4)

EndTable

DataTable (Dat5min,1,-1)

DataInterval (0,5,Min,10)

Average (1,Tref,IEEE4,False)

Average (25,TC(1),IEEE4,False)

EndTable