3 Logger voltage input with pull-up resistor
Alternatively, if a stable voltage is available in the logger, you can use
a 10k pull-up resistor, and measure the Sun output with a voltage
channel.
Sun present = 0 V, no sun = 5 V.
Note: Your logger must be able to read the voltage going into the
resistor. If it is too high, use a potential divider.
4 Switching an external load
If for any reason you want to use the Sun output to switch a high
current load, you should make sure that the current return path is
through the DL-Gnd wire, and not the SigGND wire, otherwise you
may see large offset voltages on your Total and Diffuse readings.
CH1+
CH1-
PWR
GND
5V
Datalogger
Analogue input
10k
(Voltage)
Sun
SigGND
DL-Gnd
16
z
Introduction
SPN1 User Manual v1.0
V+
V-
Power supply
12 - 15V 1.5A
Outputs isolated from mains
LAMP
DL-Gnd
DL-Power
Htr-
Htr+
Sun
