PR-680/680L User Manual
18
S
ETTING
A
DAPTIVE
E
XPOSURE
T
IME
The exposure time is the amount of time the detector is exposed to light. The PR-680/680L utilize the
patented
Adaptive Sensitivity
algorithm that automatically select 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.
S
ETTING 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 will make the measurement time longer because of the overhead the algorithm creates 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 63
–
EXPOSURE TIME ENTRY SCREEN
3.
Enter the desired exposure time. The range is 6 ms to 6,000 if the sensitivity mode is set to
Standard, and 6 ms to 30,000 when set to
Extended
sensitivity mode.
Note: The sensitivity range must be set to
Extended
to use the maximum value of
30,000 ms.
4.
Touch
Back
when done.