USL PSA-200U - Manual (Page 19)

Page 19 1st Edition. October, 2004 USL, Inc. PSA-200U Instruction Manual
Troubleshooting The PSA-200U
Camera Not Found Error Message
If your laptop displays the following error
message (See Fig. 17), you need to...
Fig. 17
1. Shut the software off.
2. Disconnect power to camera and USB
cables.
3. Re-connect all power and USB ca-
bles.
4. Re-start the software and try again.
If you still receive the error message please
contact USL at (805) 549-0161 for technical
support.
Luminance values are off
If the Luminance values are off, they will
be off by a factor of 10. Check the Camera
Range (Settings in the Program menu).
Check to see if the neutral density filter is
attached to the camera lens if you have a
unit with the 30 - 300 foot-Lamberts (100
- 1000 cd/m2) option. (See the Program sec-
tion for details on correct operation of the
Camera Range settings.)
Computer message: Alignment Error!
Manually adjust the camera angle and the
camera zoom switch so that the image ap-
pears centered in the camera’s viewfinder.
Press F3, or click on Camera View. The im-
age should appear centered in the computer
display. Adjust the zoom switch on the cam-
era or the W / T with the mouse in “Camera
View” so the edges of the image are visible
in the computer display. Now press F2, or
click on Auto Align. If the error message in
Fig. 18 appears again, try using the Manual
Alignment function. If you cannot fix the
problem, call us for technical support.
Fig. 18
Computer message: Weave and Jitter
Warning - Screen luminance may be too
high/low for accurate measurement
Verify that you have at least six to 18 foot-
Lamberts of light from the lamp house.
If you cannot fix the problem, call us for
technical support.
Weave and Jitter measurements are not
constant
The initial period that the PSA takes to
sample the projected image is 30 seconds.
When this occurs, the Weave and Jitter read-
ings will be high or zero for a few seconds
until they are updated. This is an errone-
ous reading which is normal and should
be ignored. The Weave and Jitter function
should be left to run for two minutes in or-
der to obtain enough samples of the frame
to recognize samples of the film splice. The
film splice samples will then be discarded
automatically and will not be included in
the analysis. If you are having problems
that do not seem to be due to this, call us
for technical support.
Weave and Jitter measurements do not
seem to be accurate
Make sure the camera is zoomed in on the
small squares of the RP40 test pattern (see
Fig. 6). The camera should be aimed at the
center of the test pattern and the Analysis
Square (in the bottom left corner) should
be trained only on the small black and
white squares of the RP40 test pattern. Be
sure that the projector is properly focused
on the image. The pattern in the center of
the screen, generated by the Weave and
Jitter test film, cannot be used for analysis.