Delta-T Devices SunScan SS1 User Manual page 74

Appendices
A. Logging the probe as a Linear Quantum
Sensor
This application of the SunScan probe turns it into a simple Line Quantum
sensor that can be attached to a data logger. No Data Collection Terminal
is used, but you do require a data logger that can supply power to the
probe when taking readings. The Delta-T DL2e and GP1 loggers are
suitable for this purpose.
If you want to mount the probe on a tripod, a camera mount is provided in
the base of the probe handle. The probe's coiled RS232 cable is not used,
and it must be protected from moisture by enclosing it in a bag with
desiccant, for example.
Note: no batteries are required in the probe for this mode, but it does not
hurt to leave them in situ.
Wiring connections
A special cable is also needed for this application, but because we seldom
if ever get asked for one, we do not supply a cable as such. You can
make one up by cutting the female connector off an EXT/8w-xx cable,
stripping back the insulation to create flying leads as outlined below.
Core Function
Pink V+ Power supply positive
green 0V Power supply negative
yellow HI
grey LO Signal output negative
blue not used
braid Screen
Note: the grey, green and braid are connected internally in the probe
handle. Connecting the braid to an earthing point on the logger could
create earth loops, and is not recommended.
Output

The output signal is the transmitted PAR irradiance, averaged along
the length of the probe. (Individual photodiode readings are not
accessible in the Linear Quantum Sensor mode.)

The millivolt output is linear, with a sensitivity of 1 mV = 1 μmol.m-
2.s-1. Maximum output is 2.5 V.
74  Appendices
Signal output negative
Signal output positive
Logger Connection
Sensor power positive (switched
for warm-up)
Sensor power negative (0V)
internally linked to Signal LO
Input channel +
Input channel -
Not connected (see below)
SS1 User Manual v3.3