Campbell Scientific CR5000 Measurement and Control Module - Manual (Page 129)

Section 7. Measurement Instructions
7-3
7.1 Voltage Measurements
VoltDiff (Dest, Reps, Range, DiffChan, RevDiff, SettlingTime, Integ, Mult,
Offset)
Sensor
Diff. Chanel H
Diff. Chanel L.
This instruction measures the voltage difference between the HI and Low
inputs of a differential channel. Both the high and low inputs must be within ±
5V of the datalogger's ground (See Common Mode Range, Section 3.2). With
a multiplier of one and an offset of 0, the result is in millivolts or volts
depending on the range selected.
VoltSE (Dest, Reps, Range, SEChan, MeasOfs, SettlingTime, Integ, Mult,
Offset)
Sensor
S.E. Chanel
Ground
This instruction measures the voltage at a single ended input with respect to
ground. With a multiplier of one and an offset of 0, the result is in millivolts
or volts depending on the range selected.
7.2 Thermocouple Measurements
TCDiff (Dest, Reps, Range, 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 common mode
range and to test for an open thermocouple.