12
Advanced setup
Checking the calibration status
A special Viso reference light source (Reference 800) is included in the package. The
light source has its own power supply, and both parts are labelled with identical
calibration date and numbers. Never measure without the original power supply.
Right after factory calibration of your system, the refence light source was measured
and a certificate was issued. The certificate is part of the delivery. The certificate can
also be downloaded from Viso
’
s website using the calibration number on the labels.
With the reference lamp you can quickly check your calibration status:
•
Check whether the total flux in lumen and peak candela is close to the
original values
•
Check whether the shape of the spectrum is close to the original shape.
•
Check whether the spectrum looks spiky or jagged.
If you are not happy with the result, the system needs to be calibrated. Viso
recommends calibration every year, or minimum every 2 years. Viso provides
calibration service, or you may do your own calibrations following the
‘
Custom
Calibration
’
procedure.
Check-up Procedure
•
Place the Reference 800 with the indicator (the oblong hole in the base)
upwards
•
Do not preheat the light source before measurement
•
Centre the light source in the gonio (measuring distance 66 cm)
•
Start measurement normal measurement. In the stabilization window,
choose
“1,0% in 15 min.” and let the measurement finis
h by itself.
Custom calibration
The LightSpion is delivered in a pre-calibrated condition. It is also possible to make a
custom calibration of the photo spectrometer if desired. This could be necessary if
the LightSpion is to be certified by an official agency, which will perform its own
calibration and afterwards issue certification documents.
To make a custom calibration a calibration source must be used, the spectrum of
which in a directional point at a certain distance is known. Such a spectrum is usually
specified as power in
μ
W/cm2/nm, as shown below.
