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CHAPTER 2. USING THE CALIBRATION MODULE
The calibration lamp is close to the screen, to
have maximum efficiency. The halogen lamp
is on the side, to limit its intensity and prevent a
too short exposure time.
You can keep the screen in place and switch off both
lights by activating both switches. In this configura-
tion, both LEDs will flash slowly.
When both LEDs are flashing, the screen is
across the telescope beam, but no lamp (cali-
bration or flat) is on. This is useful for taking off-
set or dark images at night but a separate shutter
is still required in full daylight.
2.1.1 Remote control
Each switch is accompanied by a socket. The sock-
ets are mechanically and electronically the same as
the power supply one (12V, positive voltage on the
central pin). Powering these connectors with 12V has
the same effect as manually switching. It allows the
Alpy calibration module to be controlled remotely.
When controlling the Alpy calibration mod-
ule remotely, take care that the manual
switches are OFF.
2.1.2 Lamps lifetime saving function
The lamps (mainly the calibration one) have a lim-
ited lifetime. In normal conditions, it should be with-
out significant effect, because the exposure time for
calibration spectra is short (a few seconds each). But
we know by experience that it is possible to forget to
switch off the lamps at the end of the night... To pro-
tect the lamps, we’ve added a feature which automat-
ically switches off the lamp after about 30 minutes.
This also works for the flat lamp. When this happens,
the corresponding LED flashes.
You can simply switch off the lamp and switch it
back on again immediately: it will be back on - for 30
minutes max.
When one LED is flashing, the lamp has been
switched off to protect the lamp’s lifetime.
2.2 Installing the Alpy calibration
module
This sections explains how to install the calibra-
tion module on the Alpy guiding module. Alterna-
tively you can adapt the installation to your specific
equipment.
Remove the T-mount / 2” adapter from the Alpy
guiding module:
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