Specifications

AM25T Solid State Multiplexer
18
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
is greater than 1, the Dest parameter must be a variable array. If 0 is entered,
the only measurement that is made is the reference temperature measurement.
Range: The Range parameter is the expected voltage range of the input from
the sensor. An alphanumeric or the numeric code can be entered:
Alphanumeric
Numeric Description
mV5000 0 +
5000 mV
mV2500 1 +
2500 mV
mV250 2 +
250 mV
mV25 3 +
25 mV
mV7_5 4 +
7.5 mV
mV2_5 5 +
2.5 mV
autorange 6 mV2_5 to mV5000; datalogger tests for and
uses most suitable range
mV250C 20 +
250 mV, checks for open input
mV25C 30 +
25 mV, checks for open input
mV7_5C 40 +
7.5 mV, checks for open input
mV2_5C 50 +
2.5 mV, checks for open input
autorangeC 60 mV2_5 to mV5000; datalogger tests for and
uses most suitable range, checks for open input
AM25TChan: The AM25TChan parameter specifies the starting input channel
for the multiplexer. If the Reps parameter is greater than 1, the additional
measurements will be made on sequential channels. If the channel is entered as
a negative number, all reps occur on the same channel.
DiffChan: The DiffChan argument is the number of the differential channel to
which the first AM25T is connected.
TCType: The TCType argument is used to identify the type of thermocouple
being measured. An alphanumeric or numeric code can be entered. Entering a -
1 records a voltage, in millivolts, instead of a thermocouple temperature.
Alphanumeric
Numeric Type
mV -1 Outputs a voltage, in millivolts
TypeT 0 Copper Constantan
TypeE 1 Chromel Constantan
TypeK 2 Chromel Alumel
TypeJ 3 Iron Constantan
TypeB 4 Platinum Rhodium
TypeR 5 Platinum Rhodium
TypeS 6 Platinum Rhodium
TRef: The TRef argument is the name of the variable which holds the result of
the reference temperature measurement.