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10/21 / V21 / OS-IF / manuals/lc-photon-counter/count-series-user-manual
Electrical connections (rear side)
1 - Power Supply (2-pin LEMO connector, type EXG.0B.302). This is for the op12 V DC power
adapter COUNT
®
- PSU (sold separately). Alternatively, the appropriate cable from the COUNT
®
- PSU is
connected here. The appropriate mating connector is the LEMO FGG.0B.302.CLAD42.
2 - Gating input (SMA female). Connect a TTL signal to this input in order to enable (TTL high, >2.4 V) or
disable (TTL low) counting.
3 - TTL signal output (LEMO connector, type EPS-00.250). A double shielded RG233/U coaxial cable
is recommended. Suited Lemo connector types are e. g. FFS.00.250 or the Lemo/BNC adapter type
ABF.00.250.CTA (available upon request).
Note: the output should be terminated into a 50 Ohms load.
In order to power up the module, simply plug-in the AC adapter in the power supply connector. After power on,
allow 30 seconds settling time in which the sensor will be cooled down to its operating temperature.
NOTE: the COUNT
®
will not generate any output signal until the operating temperature has been reached.
Optimizing performance
The COUNT
®
shows best performance if the light is focussed to a small spot (<50 µm diameter) in the center of
the sensor area. Please also see Fig. 2 of the COUNT
®
datasheet. Mounting the COUNT
®
on a suitable x, y,
z-translation table or other means of positioning mechanics is therefore recommended.
Off-center focussing or overfilling the sensor area might lead to a significant lower detection efficiency
and/or increased FWHM of the photon timing resolution.
The FC-connector version is pre-aligned for fibers of core diameter <105 µm, NA ≤ 0.29, and requires no
further optimisation.
1
2
3
+12V
GND
Powering up the module
Before powering up the module it is strongly advised to make sure that no light reaches the sensor.
Single Photon Counting Module
COUNT
®
-Series User Manual
Detectors
Germany and Other Countries
Laser Components Germany GmbH
Tel: +49 8142 2864 – 0
Fax: +49 8142 2864 – 11
[email protected]
www.lasercomponents.com
