Campbell Apogee Instruments CS310, Product Manual

Page: 15 / 25

Short Cut code into CRBasic Editor (p. 15). Programming basics for CRBasic data loggers are
provided in the following sections. Complete program examples for select CRBasic data loggers
can be found in Example programs (p. 16).
Output from the CS310 is a voltage ranging from 0 to a maximum of 20 mV depending on sensor
calibration and radiation level, which is measured by the data logger by using a differential
analog
ue
input terminal. To measure the output, CRBasic data loggers are programmed with the
VoltSE()
instruction.
Nearby AC power lines, electric pumps, or motors can be a source of electrical noise. If the sensor
or data logger is located in an electrically noisy environment, the measurement should be made
with the 60 or 50 Hz rejection integration option as shown in the example programs.
Solar radiation can be reported as an average flux density (µmol/m
2
/s) or daily total flux density
(mmol/m
2
). The appropriate multipliers are listed in Table 7-2 (p. 10).
7.4.1 Input range
Measurement integration time is specified in the input range parameter code. A more noise-free
reading is obtained with the slow or 60 Hz rejection integration. A fast integration takes less
power and allows for faster throughput.
7.4.2 Multiplier
The multiplier converts the millivolt reading to engineering units. Commonly used units and how
to calculate the multiplier are shown in Table 7-2 (p. 10).
Table 7-2: Multiplier required for flux density and total fluxes
Units Multiplier
µmol/m
2
/s
100 (flux density)
mmol/m
2
0.1t (total fluxes)
t = data logger program execution interval in seconds
Unit conversions
µE/µmol
(6.02 x 10
17
photons/m
2
s)/(µmol/m
2
/s)
7.5 Output format considerations
If solar radiation is totalized in units of mmol/m
2
, there is a possibility of overranging the output
limits. For CRBasic data loggers, avoid this by using the IEEE4 or long data format.
CS310 Quantum Sensor 10