PR-655/670 User Manual
31
FIGURE 32
–
MEASUREMENT AVERAGE ENTRY SCREEN
2.
Enter the number of measurements to average. The range is 1 to 99.
3.
Touch the
Back
key when done.
S
ETTING
A
DAPTIVE
E
XPOSURE
T
IME
The exposure time is the amount of time the detector is exposed to light. The PR-655 and PR-670 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:
