Jadak Photo Research SpectraScan PR-7 Series, User Manual

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Chapter 5
– Setup Menu
45
2.
Enter the number of measurements to average. The acceptable range is 1 to 99.
3.
Touch the Back key when done.
H
OW TO
S
ET THE
A
DAPTIVE
E
XPOSURE
T
IME
The exposure time is the amount of time the detector is exposed to light. The PR-7XX utilizes the patented
Adaptive Sensitivity

algorithm that automatically selects the proper exposure time for the available signal
insuring the most accurate measurement for the available light. Use the following procedure to set Adaptive
Sensitivity to ON.
1.
To set the instrument to Adaptive Sensitivity , make sure the field next to Adaptive reads Enabled.
H
OW TO
S
ET A
F
IXED
E
XPOSURE
T
IME
It may be desirable to set a fixed exposure time for an application. For example, when measuring a display for
luminance uniformity, the exposure time will be the virtually identical for each measurement since the luminance
levels are very similar for every part of the display. In this example, using Adaptive Sensitivity may make the
measurement time longer because of the overhead the algorithm requires in its iterative process to find the ideal
exposure time. Use the following procedure to set a fixed exposure time.
1.
If the field immediately to the right of Adaptive reads Enabled , touch the field to set Adaptive to
Disabled .
2.
Touch the field adjacent to Exposure to display the following data entry menu:
FIGURE 38
– EXPOSURE TIME ENTRY SCREEN
3.
Enter the desired exposure time in milliseconds (ms). The range is 7 ms to 120,000 ms (2 minutes) for
Standard Sensitivity and 7 to 300,000 ms (5 minutes) for Extended Sensitivity.
Note: The sensitivity range must be set to Extended to use the maximum value of
300,000 ms (5 minutes).
4.
Touch Back when done.
H
OW TO
S
ET THE
I
NSTRUMENT
S
ENSITIVITY
R
ANGE