Campbell CR800 Specifications Page 181

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Section 7. Measurement Instructions
Parameter
& Data Type
Enter
Range Alpha Code
Voltage Range
Constant mV5000
± 5000 mV
mV2500
± 2500 mV
mV250
± 250 mV
mV25
± 25 mV
mV7_5
± 7.5 mV
mV2_5
± 2.5 mV
Autorange
mV2_5 mV5000
Selects range (Sect. 3.1)
mV250C
± 250 mV The mV250C, mV25C, mV7_5C,
mV25C
± 25 mV and mV2_5C ranges pull the channel
mV7_5C
± 7.5 mV into common mode range and check
mV2_5C
± 2.5 mV for open input
AutorangeC
mV2_5 mV250
Selects C range
Am25tChan
Constant
The starting input channel on the multiplexer.
DiffChan
Constant
The Differential channel that will be used to make the actual measurements
from the AM25T.
If the channel is entered as a negative number, all reps occur on
that channel.
TCType
Constant
The Thermocouple Type Code. Enter -1 to return voltage measurements.
Tref
Variable
The variable in which to store/read the AM25T reference temperature.
ClkPort
Constant
The Digital Output port number that will be used to clock the AM25T. One
clock port may be used with several AM25Ts.
ResPort
Constant
The Digital Output port number that will be used to enable and reset the
AM25T. Each AM25T must have it's own unique Reset line
VxChan
Constant
The Excitation Channel number that will be used to provide excitation for
the PRT reference temperature measurement. If 0 is entered for the
excitation channel, the temperature is not measured.
RevDiff Code Value
Result (Reversing requires twice as much time to complete)
Constant False 0
Signal is measured with the high side referenced to the low
True 0
A second measurement is made after reversing the inputs to
cancel offsets
SettlingTime
Constant
The time in microseconds to delay between setting up a measurement (switching to
the channel, setting the excitation) and making the measurement. (1 microsecond
resolution)
Entry
Voltage Range Integration Settling Time
0
All 250 µS 450 µS (default)
0
All _50Hz, _60 Hz 3 mS (default)
>=100
All All µS entered
Integ The time spent on integration in microseconds for each of the channels measured.
Constant Entry
Integration
250
250 µS
_60Hz or 16667
16,667 µS (reject 60 Hz noise)
_50 Hz or 20000
20,000 µS (reject 50 Hz noise)
Mult, Offset
Constant,
Variable,
Array, or
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. For example, the TCDiff
instruction measures a thermocouple and outputs temperature in degrees C. A
multiplier of 1.8 and an offset of 32 will convert the temperature to degrees F.
7-27
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