TRIP REPORT (Sanitized) 1540-4 LIGHT TABLE

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B05171A000400030035-2
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 7
• Document Creation Date: December 28, 2016
• Document Release Date: June 7, 2005
• Sequence Number: 35
• Publication Date: December 9, 1971
• Content Type: MFR

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NPIC/TSG/ESD/EPB-37/71
9 December 1971
SUBJECT: Trip Report -
0
1540-4 Light Table
1. A trip was made to = to assist DIA in preacceptance of the
1540-4 Light Table and to check for any maintenance problems on the
prototype tracking high intensity light source. I was accompanied by
RED, and DIA.
2. The preacceptance went very well. The table met all specifica-.
tions but one. This spec calls for the carriage to travel 4 inches in
16 seconds. The table takes 18 seconds--- DIA felt this would not cause
the operator any difficulty. However, DIA as yet, has not decided to
waive this spec. The added circuitry that is required to accomplish the
different carriage speeds will not add any difficulty to maintaining the
table.
3. The housing for the tracking light source travels on a track
that is not stable. It permits the lamp to vibrate. was aware of
this and will make the necessary correction. There does not appear to
be any unusual maintenance problem. associated with the lamp.
4. The DIA table was delivered on 8 December 1971 and is in the
Test and Evaluation Branch Area on the first floor.
25X
25X
Equipment Pe formance Branch, ESD TSG.
NPIC -
Distribution:
Original - Addressee
1 - DIA
1 - TSG RED
1 - TSG/ESD
1 - TSG/ESD/EPB
Declass review by. NGA/DoD
Excladz~
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FAULTS Oh MLT 151+0 / 5 LIGHT TA LES UP TO 19/10/71
14 Zoom 20 loose in holder
2. Perforated bands broken
36
4. Motor control 's/vi loose
5.
X m Y bridge control inoop.
6. Film drive in one direction
only
Ti
do.
Fluorescent lamp failures
9, do.
do.
Retaining clips straightened
Rep.,. aced
Rep. aced
Tightened
Fuse F6 re-placed
Film drive H. S. P.C.B. U/S
3 transistors replaced
35-27/
Motor control board R6 adjusted for balance
Lamp replaced
Fuse on illumination control P.C.B. replaced
Transistor on illumination H.S. P.C.B. replaced
Replaced
Pin sheared on top sprocket-
Reps aced
Compensated one-shot board replaced.
Replaced
Tightened
11. Broken rode s/vt
12. Microscope carriage innop.
13. X carriage bearing broken
11f. No illumination control
15. Main fuse ',lovvrl
16. X -Y control knob loose
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Naval Reconnaissance and Technical Support Center
25X(1
Report on
IMLT 1540 LIGHT TABLE
25X1
1.The five JMLT 1540 Light Tables received by NRTSC are basically
the same models evaluated by NPIC in the Supplementary T&E Report,
NPIC/R-14/71 of May 1971. There are many deficiencies in the NRTSC
models which effect the suitability of the units; for operational use.
Additionally, the specifications to be met in th? construction of the
.production units have vague technical requirements pnd the Operation/
Maintenance Manuals have no documentation of reliability of parts.
2. In. general, illumination, elevating and tilt capability, film
handling system, and carriage motion meet specification requirements;
however, with respect to functional performance and reliability several
undesirable features must be noted: {
a. 'The horizontal plane of the microstereoscope mount and
.viewing surfaces are not within the 0.015 inch parallelism spec
requirement over the entire translation field of the. microstereoscope
mount. '
b. The plane of the microstereoscope ring is also not parallel
with either viewing surface.
c. There is no limit lock on the downward movement of the
microstereoscope pod, thus the rhumboids are capable of beislg forced
against the film,or vie~ing surface when using the focus control.
d. The electrical cord on the rear of the optical bridge
hinders X and Y movement of the microstereoscope mount and can be
damaged or severed during prolonged operations.
e. The single bearing supporting-the back plate of the
microstereoscope mount is poor designed., This presents a collimation
problem between the microstereoscope pod and the viewing surface.
Bearings of units were broken after approximately 30 hours of light
table operation.
f Undesirable "flicker" exist in several luminaires from 140
,to over 1100 foot lamberts.
g. The adjustable illumination capability is inconsistent in
performance. Several lamps light up and extinguish at random.
h. During testing excessive emulsibn deposits accumulated on
both supply, and take-up film support rollers while translating 1000
feet of 91~inch film, emulsion up, at high speed. Fortunately the film
had no real significance except for procuring the required footage
to perform this test.
i.! The small shoulder on the idler spindle wears and enlarges
the'hole in the film spool flange allowing the flange to override the
shoulder and ride on the spindle arm. Prolonged use with heavy spools
may shear off the spindle arm and' damage spool and`film, this may
occur while translating film at high speeds.
j. Full spools of film (1000 feet of 9/ inch) are of Itifficient
-
weight, to 'release the spring loaded lever on the film drive while trans
la.ring
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film at high speeds. This is a hazzard to anyone in the immediate area
and will cause considerable damage to the film.
k. Each take-up roller is a solid-rod-and can cause damage
to a stationary web of film while translating the other web of film in
the parallel viewing mode.
1,. Several'malfunctions also occurred which terminated
operational testing until maintenance was performed, namely:
CONCLUSIONS
1.- The slip clutch went. out of adjustment and caused the
microstereoscope bridge to fall forward toward the
operator while operating in.the Olt mode.
2'.. The tachometers in both the supply and take-up
film drive motors went out of adjustment creating
very poor film speed control. (Excessive. hes:itat.ion
and jerkiness)
1. All.the above discrepancies may not be inherent in every production
unit. However, the observations made by this Command during testing
and operational use, indicate this model is not considered the optimum
equipment for use in a sustained operational production environment.
Because of the above factors and other considerations, i.e. space and
budget, this Command does not anticipate any future procuremept of 1540
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