Campbell CR800 Spezifikationen Seite 180

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Section 7. Measurement Instructions
Parameter
& Data Type
Enter
Dest
Dest is the variable in which the results of the measurement will be stored. If the
Reps parameter is greater than one, Dest must be an array dimensioned large
enough to hold the results for all repetitions.
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.
SEChan
The SEChan argument is the number of the single-ended channel on which to
make the first measurement (1-16). If the Reps parameter is greater than 1, the
additional measurements will be made on sequential channels.
ExChan
The ExChan is the excitation channel number (1-3) to use to excite the
thermistor. If multiple thermistors are measured with one instruction, all
repetitions will use the same excitation channel. An alphanumeric or numeric
code can be entered.
SettlingTime
The SettlingTime parameter is the amount of time to delay after setting up a
measurement and before making the measurement. Refer to the table below for
default SettlingTimes.
Entry Range Integration Settling Time
0 All 250 ms 450 ms (default)
0 All _50Hz 3 ms (default)
0 All _60Hz 3 ms (default)
>100 All All ms entered
Integ
The Integ parameter is the amount of time, in microseconds, to integrate a signal
for the channel being measured.
Option Description
250 Performs a 250 microsecond integration.
_60Hz Performs a 16.667 millisecond integration; filters 60 Hz noise.
_50Hz Performs a 20 millisecond integration; filters 50 Hz noise.
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 temperature in degrees C. With a
multiplier of 1.8 and an offset of 32, the output is temperature in degrees F.
7.9 Peripheral Devices
AM25T (Dest, Reps, Range, AM25TChan, DiffChan, TCType, Tref, ClkPort,
ResPort, VxChan, RevDiff, SettlingTime, Integ, Mult, Offset)
This Instruction controls the AM25T Multiplexer.
Parameter
& Data Type
Enter
Dest Variable
or Array
The Variable in which to store the results of the instruction. When Reps are used the
results are stored in an array with the variable name. An array must be dimensioned
to have elements for all the Reps.
Reps
The number of channels to measure on the AM25T. Enter 0 to just measure
Temperature.
7-26
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