PR-680/680L User Manual
5
11.
The PR-680/680L will first make a spectroradiometer measurement, then a photometer measurement.
Following both measurements, the PMT (Photometer) factor is automatically calculated. At this point, all
successive photometer measurements, regardless of the aperture used, will use this factor when displaying
the measured luminance.
C
USTOM
S
PECTRAL
C
ALIBRATION
The correlation of two instruments measuring the same sample has always been an issue. This is especially true
when comparing results from two different instrument manufacturers, or when the calibration of an instrument is
suspect. To help eliminate this problem without requiring full recalibration of the instrument, we have added a
Custom Spectral Calibration feature to the suite of features on the
PR-680 / 680L. This feature allows the user to establish a set of unique spectral calibration factors for one
instrument based on the measurement of a sample from a second instrument. Then, when both instruments
analyze the sample in question, they will correlate with exceptional accuracy.
The second (
Source
) instrument can be a Photo Research product, or other spectrally based instrument. The
parameters of the spectral data for the second instrument
must
be compatible with that of either the
PR-680. The parameters are:
Instrument
Starting WL
Ending WL
WL (Data) Increments in nm
PR-680 / 680L
380
780
2
A
CCESSING THE
C
USTOM
S
PECTRAL
C
ALIBRATION
M
ENU
1.
Touch
Setup
→
Advanced Setup
→
Custom Spectral Calibration.
The
Custom Spectral Calibration
screen appears.
→
→