Campbell Scientific CR510 Basic Datalogger - Manual (Page 110)

SECTION 9. INPUT/OUTPUT INSTRUCTIONS
9-6
PARAM. DATA
NUMBER TYPE DESCRIPTION
01: 2 Repetitions
02: 2 Range code for V
1
(Table 9-1)
03: 2 Range code for V
2
04: 2 Differential channel
number for first
measurement
05: 2 Excitation channel number
06: 4 Excitation voltage
(millivolts)
07: 4 Input location number
for first measurement
08: FP Multiplier
09: FP Offset
Input locations altered: 1
*** 10 BATTERY VOLTAGE ***
FUNCTION
This instruction reads the battery voltage and
writes it to an input location. The units for
battery voltage are volts. At approximately 9.6
V the CR510 suspends measurements.
PARAM. DATA
NUMBER TYPE DESCRIPTION
01: 4 Input location
Input locations altered: 1
*** 11 107 THERMISTOR PROBE ***
FUNCTION
This Instruction applies a 2 VAC excitation
voltage to Campbell Scientific's Model 107
Thermistor Probe, makes a single-ended
voltage measurement across a resistor in series
with the thermistor, and calculates the
temperature in °C with a polynomial. A
multiplier of 1 and an offset of zero yields
temperature in degrees Celsius. The maximum
polynomial error from -40°C to +56°C is given
here:
Curve Fit Error --
Range (°C) Error (°C)
-40 to +56 <
±
1.0
-24 to +48 <
±
0.1
TABLE 9-3. Excitation/Integration Codes
Code Result
0x excite with channel x
1x increment chan x with each rep
2x excite with channel x, 60 Hz rejection, 10
ms delay
3x excite with channel x, 50 Hz rejection, 10
ms delay
4x increment chan x with each rep, 60 Hz
rejection, 10 ms delay
5x increment chan x with each rep, 50 Hz
rejection, 10 ms delay
PARAM. DATA
NUMBER TYPE DESCRIPTION
01: 2 Repetitions
02: 2 Single-ended channel
number of first
measurement
03: 2 Excitation/Integration
*Code (See Table)
04: 4 Input location for first
measurement
05: FP Multiplier
06: FP Offset
Input locations altered: 1 per repetition
*** 12 207 RELATIVE HUMIDITY PROBE ***
FUNCTION
This instruction applies a 1.5 VAC excitation
across Campbell Scientific's Model 207
Temperature and RH Probe, makes a fast
single-ended measurement across a series
resistor, calculates the result with a 5th order
polynomial, and performs the required
temperature compensation before outputting
the result in % RH.
NOTE: The temperature value used in
compensating the RH value (Parameter 5)
must be obtained (see Instruction 11) prior
to executing Instruction 12 and must be in
Celsius.
The RH results are placed sequentially into the
input locations beginning with the first RH value.
In the 207 probe, the RH and temperature
elements use a common excitation line.