Calibration, Maintenance, and Troubleshooting
StarBright User Manual
110
The non-linearity is approximately 2%, and the error due to wavelength is described in
In addition to the above errors, the reading of Pyroelectric sensors changes with frequency. The
sensor has a built in correction for this error. For frequencies above 50% of maximum frequency,
inaccuracies in this correction can increase the total error by about 3%.
The maximum error in measurement will be less than the sum of the above errors and in general
will be considerably less. The exact accuracy of each type of sensor is specified in the latest edition
of the
. For more details on calibration accuracy, see the Ophir website at
14.4.4
Updating Pyroelectric Sensor Calibration Factors
Calibration of Pyroelectric sensors is only done when they are measuring energy. As such, if the
sensor was in power or exposure mode, entering the calibration screen will force it into energy
with no option to change this until after leaving calibration and returning to the regular
measurement screens.
Some Pyroelectric sensors only have an overall calibration factor and do not have any wavelength
specific factors. For these sensors this screen is informational only before continuing along to the
actual calibration screen and the Navigation Panel is disabled. The BB series of sensors have
wavelength specific factors and therefore this screen allows the user to use the Navigation Keys to
select which type of factor he is calibrating before continuing to the actual calibration screen.
To update Pyroelectric sensor calibration factors:
1.
Press
Menu
and select
Calibration
. The screen displays the following general message:
Figure
14-28 General Calibration Information Screen
