Campbell Scientific CR9000X Measurement and Control System - Manual (Page 229)

Section 7. Measurement Instructions
7-5
Parameter
& Data Type
Enter VOLTSE PARAMETERS
Dest
Var. 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
Constant
The number of repetitions for the measurement.
Range The voltage range for the measurement. V ranges output volts, mV ranges output millivolts.
Constant ± 5 Volt Analog Input Module ± 50 Volt Analog Input Module
Alpha
Code Numeric
Code Voltage
Range Alpha
Code Numeric
Code Voltage
Range
mV5000 0 ± 5000 mV V50 6 ± 50 V
mV1000 1 ± 1000 mV V10 7 ± 10 V
mV200 4 ± 200 mV V2 10 ± 2 V
mV50 5 ± 50 mV mV500 11 ± 500 mV
Aslot
Constant
The number of the slot that holds the Analog Input Module to be used for the measurement.
SEChan
Constant
The single-ended channel number on which to make the first measurement. When Reps are used,
subsequent measurements will be made on the sequential single-ended channels. Enter a negative
number to dwell on that channel for the number of measurements specified by the Reps parameter
(except for CR9058E).
SettlingTime
Constant
The time in microseconds to delay between setting up a measurement (switching to the channel, setting
the excitation) and making the measurement (10 microsecond resolution). See Section 3.1.3 Signal
Settling Time.
Entry
Voltage Range
Delay CR9055
Voltage Range
Delay
0 ± 50 mV 20 µS (default) ± 0.5V 40 µS (default)
0 ± 200 mV 20 µS (default) ± 2 V 40 µS (default)
0 ± 1000 mV 10 µS (default) ± 10 V 30 µS (default)
0 ± 5000 mV 10 µS (default) ± 50 V 30 µS (default)
> 0 all Truncate to closest 10 µS all Truncate to closest 10 µS
Integ
Constant
The integration time in microseconds for each of the channels measured (10 microseconds resolution).
See Section 3.1.1.3 Integration for more information on Integration.
Mult, Offset
Constant, Var.,
Array,
Expression
A multiplier and offset by which to scale the raw results of the measurement. See the measurement
description for the units of the raw result; a multiplier of one and an offset of 0 are necessary to output in
the raw units.
7.2 Thermocouple Measurements
TCDiff (Dest, Reps, Range, ASlot, DiffChan, TCType, TRef, RevDiff,
SettlingTime, Integ, Mult, Offset)
Diff. Chanel H
Diff. Chanel L
Thermocouple
This instruction measures a thermocouple with a differential voltage
measurement and calculates the thermocouple temperature (°C) for the
thermocouple type selected. The instruction adds the measured voltage to the
voltage calculated for the reference temperature relative to 0° C, and converts
the combined voltage to temperature in °C. The mV50C and mV200C ranges
briefly (10 µs) connect the differential input to reference voltages prior to
making the voltage measurement to insure that it is within the Input Voltage
Limit range and to test for an open thermocouple.