Campbell CR800 Spécifications télécharger pdf (Page 157)

Section 7. Measurement Instructions

7.1 Voltage Measurements

VoltDiff (Dest, Reps, Range, DiffChan, RevDiff, SettlingTime, Integ, Mult,

Offset)

Sensor

Diff. Channel H

Diff. Channel 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. Channel

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. Channel H

Diff. Channel 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 ranges that are specified with

a code ending in C (e.g., mV2_5C) 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.

7-3

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Campbell CR800 Spécifications Page 157