Page 25
2nd Edition. January, 2000
ULTRA
★
STEREO
PSA-200 Instruction Manual
Fig. 28a
Fig. 28b
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 or click on F3, 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 or click
on F2, Auto Align. If the error message in
Fig. 29 appears again, try using the Manual
Alignment function. If you cannot fix the
problem, call us for technical support.
Fig. 29
Computer message: Weave and Jitter
Warning - Screen luminance may be too
high/ low for accurate measurement
Verify that you have at least 6 to 18 foot-
Lamberts of light from the lamp house. If
you cannot fix the problem, call us for tech-
nical 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 im-
age. The pattern in the center of the screen,
generated by the Weave and Jitter test film,
cannot be used for analysis. Zooming in or
out too far will cause errors in readings.
