MEMORANDUM TEST REPORT - ACCPETANCE TESTING OF THE(Sanitized)1540-4 LIGHT TABLE

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B05171A000400030010-9
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 15
• Document Creation Date: December 28, 2016
• Document Release Date: June 6, 2005
• Sequence Number: 10
• Publication Date: April 28, 1972
• Content Type: MF

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TSG/ESD/TEB-038/72
28 April 1972
MEMORANDUM FOR: Chief, Research Engineering Division, TSG
THROUGH Chief, Engineering Support .Division, TSG
Chief, Test Evaluation Branch, ESD/TSG
SUBJECT
,REFERENCE
Memorandum Test Report - Acceptance Testing
"of the I 11540-4 Light Table :
? TEB Report 027/72, "Acceptance Testing of
the' 11340-4 Light Table - Preproduction
MODEL for DIA"
1. INTRODUCTION
The I 11540-4 Light Table (DIA's) was first submitted
to ESD/TEB for acceptance testing on 13 December 1971. Test-
ing was stopped after one day when it became apparent that
the motorized optics carriage was not operating sufficiently
close to specified levels to warrent continuation of tests.
reworked the electrical system and resubmitted the
table for tests on 17 January. The test program that followed
revealed several specifications that were not met by the '
contractor; these were reported in reference (a). Subsequently,
the contractor was notified that the light table was not
acceptable.
Again the light table was reworked in-house by the
contractor. On 10 March it was resubmitted for test and
evaluation. This report describes the findings and compares
them to earlier results.
2. SUMMARY OF RESULTS
2.1 The following conditions were corrected and now meet
specifications:
o The minimum illumination level is now 200-foot-lamberts.
o Parallelism of the viewing surfaces to the micro-
stereoscope mount is within 0.011 inch.
o The focusing mechanism retains its locked "focused"
positions.
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2.2 The following specifications, for the optics carriage
motorized transport were not met:
.o Minimum operating speed - The permissible range is
0.0045 to 0-.0055 In/sec.. Average .operating speeds
varied from 0.0029 to 0.0052 in/sec. There is no
significant improvement in the reworked light table.
o Maximum operating speed - Requirement is for 0-.250
in/sec or greater. Maximum speed achieved in the
test was 0.234 in/sec. The condition is slightly
worse than before.
o Time to attain set speed - Requirement is for 1.0
second or less. The observed time varied from
0.40 to 4.19 seconds. There' is no significant
improvement in the reworked light table.
o Time from release of control to stop Requirement
is for 0.1 second or less. Time required ranged
from < 0.02 to 0.26 seconds. There is no improve-
ment in the reworked light table.
o Speed of X travel vs. Y travel - Requirement is for
X travel to be within 10 percent of Y travel. At
minimum speed setting there was a 58 percent
difference with the table horizontal and a 189 per-
cent difference with the table tilted. There is
no improvement in the reworked light table.
o Uniformity of incremental velocities - Requirement is
that any change in speed should not be greater than
+ 5 percent. In several cases the change exceeded
-50 percent. There is no improvement in the reworked
light table.
2.3 Additional specifications that were not met, all reported
in reference (a), are as follows:
The sources flicker at low illumination level. There
is no change in the reworked table.
o The optics carriage will not translate over the entire
Y direction of the viewing surface. There is no
change in the reworked table.
o A few of the instructions in the operation manual are
incorrect. A revised manual was not provided.
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3. TEST DETAILS
3.1 Listed below are specifications that were not met in the
previous test program, past results and the results .of the
latest test program:
Section 3.1.1.1 Illumination Level
Specification ... "The minimum level of each of the
sources shall be 200 foot lamberts."...
Past Results - Left format Minimum value was 250
foot lamberts.
Latest Results - Meets specification - 200 foot
lamberts.
o Section 3.1.1.4 Flicker
Specification ... "such-a level as not to be visibly
objectionable to the sponsor's operators at any light
intensity level"...
Past Results - There is objectionable flicker when the
illumination level is set for 400 foot lamberts.
Latest Results - No change.
Section 3.5.1.2 Translation
Specification ,.. 'translation in the Y direction shall
be adequate to cover the full 15 inch depth of the
glass viewing surface"..
Past Results - Length of tracks and obstructions caused
by electrical cables hitting back members of the table,
prevent the microstereoscope mount from translating
over the rear 1 7/8 inches of the illuminated surface
in the Y direction. Because of this condition future
damage to electrical cables is highly probable.:
Latest Results - No change.
o Specification ... "and the viewing surfaces be parallel
within 0.015 inches over the entire translation field
of the microstereoscope mount"...
Past Results - Between two specific points, one on each
glass surface, a difference of 0.016 inches was
measured.
Latest Results Meets specification - 0.011 inch.
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o Section 3.5.1,5 Locks
Specification ... "The focusing mechanism shall be
self locking"...
Past Results - At the 4 7/8 inch height-the pod
drifted down 0:002 inch in one test and 0.005 inch
in another.
Latest Results - Meets specification. There was no
drift in 12 tests.
Section 4.1 Instruction Manual
Specification ... "describing proper installation,
. operation, and maintenance"...-
.
Past ObServed ?.Paragraph 2.6.2(i) The word "counter-'
.clockwise" should-be.changed to "clockwise."
Paragraph 2.6.2(k) The word "clockwise" should be
'changed to "counterclockwise."
Paragraph 2.6.3(i) The word "clockwise" should be
changed to "counterclockwise."
Latest Observation - No change.
- OPTICS CARRIAGE MOTORIZED TRANSPORT -
Specification 1. "X-Y minimum starting and operating
speed 0.005 in/sec + 10%." (Range 0.0045 to 0.0055
in/sec.)
Past Results - Average operating speeds varied from
0.0018 to 0.0053 in/sec. In 31 tests the specifi-
cation was met 18 times.
Latest Results - Average operating speeds varied from
0.0029 to 0.0052 in/sec. In 16 tests the specifi-
cation was Met 9 times. (see- Table 1)
o- Specification 2, "X-Y maximum speed 0.250 in/sec."
- ? '
Past Results - Specification was met.
Latest Results - Only one maximum speed-test condition
was run. With the table horizontal the carriage was
preconditioned by moving to the rear. It was then
restarted by moving forward. Under these conditions
? the maximum speed was 0.234 in/sec. The specifi-
cation was not met.
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Specification 3. "Time to attain set speed 0.5 to 1.0
sec or Jess."
Past Results - From 32 tests, at minimum speed, 15
did not meet the specification, (range - 0.42 to
4.86 seconds).
Latest Results - From 16 tests at minimum speed, 10
did not meet the specification. The time to attain
set speed ranged from 0.40 to 4.19 seconds. Tests
were not made to determine the times at faster
transport speed settings. (see Table 2)
o Specification 4. "Time from release of control to
stop 0.1 sec or less."
Past Results - In 31 tests at minimum speed setting
18 did not meet the Specification. Time required
ranged from < 0.02 to 0.44 seconds.
Latest Results - In 16 tests at minimum speed setting
13 did not meet the specification. Time required
range from