Use with a data logger
Analogue outputs
The SPN1 is connected to a data logger via an 8-pole M12 waterproof
connector using cable type SPN1/w-05. See also Cables on page 9.
Additional weatherproof extension cables with M12 connectors at each
end are also available (type EXT/M12-x where x = 5, 10 or 25m).
SPN1 analogue output connector pin-out
(looking at pins on SPN1)
Signal
Name
Pin
No
SPN1/w-05
Cable
Cable Notes
Total
1 ----
White
Total output, 1mV = 1 W.m
-2
Diffuse
2 ----
Brown
Diffuse output, 1mV = 1 W.m
-2
SigGND
3 ----
Green
Signal ground (connected to DL-Gnd
internally
Sun
4 ----
Yellow
Contact closure on sunshine
DL-Gnd
5 ----
Grey
Datalogger power ground
DL-Power 6 ----
Pink
Datalogger power supply 4 - 15V 2mA
Htr-
7 ----
Blue
Heater ground
Htr+
8 ----
Red
Heater power supply, 12V 1.5A max
Screen
Screen
Cable screen and SPN1 body
The Total, Diffuse and Sun outputs are active 100ms after a voltage is
applied to the DL-Power cable, and are updated every 100ms.
The Total and Diffuse outputs have a range of 0V – 2.5V (0V – 1.3V in
normal daylight conditions), with an internal resistance of 100
Ω
. There is
also some protection on these outputs if they are taken outside their
normal range. These outputs should be measured by a high impedance
voltage input channel, with SigGND taken to the negative input of the
channel.
The sun output is switched by a FET (transistor) to ground. When there is
no sun, this output is open-circuit. When there is sun, it is connected to
ground. Any voltage applied to this output should be between 0V and 15V,
with a maximum current capacity of 500mA (0.5A). If this output is used to
switch more than a few milliamps, you should ensure that the current flows
back through the DL-Gnd cable, and not the SigGND, otherwise there may
be voltage errors in the Total and Diffuse measurements.
SPN1 User Manual v1.0
Introduction
z
11
