24
Momentarily pressing the
WAVELENGTH
keys will
increase or decrease the calibration wavelength by
1nm. Wavelength will continue to change as long as
the wavelength key is held in.
b.
If the wavelength is greater than the value displayed,
depress the
WAVELENGTH
key, and hold until the
desired wavelength is reached.
c.
If the wavelength is less than the value displayed,
depress the
WAVELENGTH
key, and hold until the
desired wavelength is reached.
NOTE
Different detectors are sensitive over different wave-
length ranges. See the appropriate detector manual
and calibration data to determine the range of wave-
lengths for which the detector connected to the
Model 840-C can be used. The calibration constants
stored in the Detector Cal Module span only the
wavelength range appropriate for the detector and
are specific to that detector.
If the calibration wavelength cannot be set to within 1 nm
of the desired value, then the detector/memory combina-
tion being used is not appropriate for this measurement.
See Sections 4 and 5 for service or replacement.
3.5.2 Setting the Attenuator Status
Many Newport photodetectors are provided with cali-
brated attenuators. The calibration constants for an
attenuator/detector combination are stored in the
Detector Cal Module. To measure optical powers above
the saturation limit of the photodetector (see appropriate
photodetector manual), use an attenuator. When the
attenuator is selected the following occurs:
a.
The
,
ATTENUATOR
annunciator is displayed.
b.
The detector calibration constants are computed
including the effects of the attenuator.
If the attenuator is subsequently removed, the
,
ATTENUATOR
key should be pressed to turn the attenua-
tor off. Subsequently, all displayed values will be com-
puted using wavelength calibration constants computed
for the detector without the attenuator.
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