SUPPLEMENTARY TEST & EVALUATION REPORT(Sanitized) MLT 1540 LIGHT TABLE PRODUCTION MODEL T&E REPORT 70-03 SUPPLEMENT

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B05171A000400030001-9
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 19
• Document Creation Date: December 28, 2016
• Document Release Date: June 6, 2005
• Sequence Number: 1
• Publication Date: January 1, 1970
• Content Type: REPORT

Approved or e : A-RDP 00630001-9
MLT 1540 Light Table has been accepted
for use in NPIC. The table has met, or exceeded the
specifications provided for its production.
This document reports the testing accomplished on
those items which were changed as a result of the pro-
totype testing (T$E Report 70-03, NPIC/R-46/70, August
1970).
Declass review by NGA/DoD
Approved For Release 2005/06/23: CIA-RDJ 78BO5171A000400030001-9 LL `:
 Approved For Rise 2005/06/23: CIA-RDP78BO5171 400030001-9
Figure 1.
MLT 1540 Light Table
Approved For Release 2005/06/23 : CIA-RDP78BO5171A000400030001-9
 Approved For se 2005M6/23 t1-
78B05171400400030001-9
SUPPLEMENTARY TEST F EVALUATION REPORT
0
MLT 1540 LIGHT TABLE PRODUCTION MODEL
T&E REPORT 70-03
SUPPLEMENT
1. Introduction
1.1 The 0 1540 Split Format Light Table was originally
tested from 12 March to 1 May 1970. This testing resulted
in the aware of a production contract to 0 for tables of
like design, but with some substantial changes. The first
production model was received for testing on 11 December
1970. Testing was completed on 29 December 1970.
1.2 This report details the operation of those items which
were changed, or for which change was requested. Those
items which were satisfactory at the previous testing were
not checked, and are not reported.
25X
Approved For Release 2005/06/23: CIA-RDP78B05171A000400030001-9
 f 4~~rr
Approved For., se 2005/06/'IJ_; (,'il,RPP78B05171 400030001-9
2. Summary of Test Results
The following table summarizes the results of the
supplementary testing. References listed will. be found
in the main document, T&E Report 70-03, NPIC/R-46/70,
July 1970.
j Present
Correction to be Made Condition Remarks
1. Film Handling System
a) Lower cover posi- Satisfactory
tion for split
mode (p. 13)
b) Bracket detents Satisfactory
(P. 18, 19)
c) Release lock Satisfactory
(P. 18)
d) Idler bracket Satisfactory
flex (p. 19)
e) 70mm tracking Satisfactory Finger Guides physically.
(p. 19)
f) High speed
should not go
below 20 inches/
second (p. 20)
g) Film tension
(p. 20)
Satisfactory
Satisfactory
hold edges of film in
position.
,2. Illumination Sources
a) Uniformity Satisfactory This specification was
(p. 15) revised for production
models.
b) Color of Illumi- Satisfactory
nation (p. 14, 15)
UV Certification Satisfactory
3. Microstereoscope
Mount Assembly
(p. 20., 21)
Satisfactory
Approved For Release 2005/06/23 : CIA-PDP78B05171A000400030001-9
 Approved For., Pose 2005/06/23: CIA-RDP78BO5171p 400030001-9
Present
Correction to be Made Condition
4. Carriage Motion
a) Manual Movement
(p. 22)
b) Fail-Safe Y
Switch (p. 26)
c) Adjustable X
translation stops
Satisfactory This specification was
changed for the produc-
,tion models.
Satisfactory This specification was
changed for the produc-
tion models.
Satisfactory Made stops semi-captive.
5.
(p. 21)
Controls
a) "Shape" coding
of control knobs
(p.. 25)
Satisfactory
b) Pictograms
(p. 25)
Satisfactory
c) Quick release
loading mechanism
(p. 26)
Satisfactory
6.
Noise (p. 24)
Satisfactory
7.
Elevating Table
Satisfactory
p. 13)
8.
Parallellism - Glass
Satisfactory
9.
to Pod Holder
.*Vibration
Excellent
*
No correction requested.
This specification was
changed for the produc-
tion models.
Stops have been provided.
Cord interference no
longer exists.
Supports with adjustment
.to achieve parallellism
are provided.
Building vibrations are
measurably damped by the
table structure when tilted,
regardless of tilt angle.
Approved For Release 2 )2 :.CIA-RDP78B05171A00040003000.1-9
 Approved For ease 2005/O6f23.:.,CIA,RDP78B0517 0400030001-9
3. CONCLUSIONS
X1 3.1 The
MLT 1540 Light Table production Model is
suitable for operational use. The production model has
been inspected by operational components and meets with
their approval.
Approved For Release 2005100/23;:,?CIA-RDP78B05171A000400030001-9
~! :'
 Approved For ease 200t%06/23 : CIA-RDP78BO5170400030001-9
4. Description of Equipment
4.1 Microstereoscope Carriage and Mount
4.1.1 The focus mechanism has been completely redesigned. The
prototype had an F-I coarse focus with a " fine focus
mechanism mounted on it. The present unit has
with coarse and fine movement completely built
The pod retainer is unchanged.
4.1.2 The bearings for the carriage have been
a smoother manual motion.
4.1.3 The motorized drive has been completely
controls have been moved to the area above the
Figure 2). The counterbalance system has been
an integral unit
for this table.
changed to give
redesigned. The
pod mount (see
eliminated in
table is tilted,
favor of a fail-safe Y-motion system. When the
the carriage cannot move in the Y direction unless: 1) a toggle
switch is thrown, and 2) a fail-safe release switch on the pod
mount position is depressed.
4.1.4 Semi-captive movable stops in the X-direction were
added to prevent rhomboid arms from hitting the frame of the
table.
4.2 Film Handling System
4.2.1 The film handling controls have been reworked. The
shapes of the speed controls have been changed to avoid the
fatigue noted in the earlier report. Pictograms have been
added to avoid confusion and misuse of the controls (see
Figure 3).
Approved For Release 20A'CIA-RDP78B05171A000400030001-9
25X
 Approved For ase 2005/06/23 : CIA-RDP78130517 0400030001-9
, # V
4.2.2 Mechanical fingers have been added to prevent tracking
difficulties with 70mm film.
4.2.3 The quick release action of the film brackets has been
changed to preclude accidentially dropping a loaded spool of
film by catching the release on clothing.
4.2.4 Detents and visual markers have been added to aid in
the setting up of the specified combinations of film for
interpretation.
4.2.5 The idler bracket has been redesigned to eliminate the
flex which was specified in the earlier report.
Approved For Release',~005/06/23 `.-CIA-RDP78BO5171A000400030001-9
 Approved For ease 2005/06/23 CIA-4ZDP78130517 0400030001-9
4.3 Illumination Sources
4.3.1 The placement of the illumination sources or tubes was
changed to meet the uniformity specification. The curved
section of the tube was moved to the center section of the
table from the outer section to eliminate the dark area at the
center opening of the prototype.
4.3.2 The masks used for the open space between dual webs of
film was eliminated.
4.4 Controls
4.4.1 The tilt-elevate control box was moved to a position
under the right side of the table. The switches are shape coded
to enable blind use of the controls (see Figure 4).
4.5 An elapsed time meter has been added to the circuit for
warranty and maintenance purposes. This meter is connected to
the main power switch, and counts time when that switch is in
the on position (see Figure 5).
4.6 The upper glass surfaces do not move outward in order to
use the split format mode. The center rollers can be lifted
easily by hand to provide access for stuffing film.
Approved For Release 2005/;Q 123.:CIA-RDP78BO5171A000400030001-9
 Approved For ase 2005/06/23 CIA-RDP78B0517*0400030001-9
, 8
5. Test Details
5.1 The current drawn by the table with lights maximum and
both sets of film motors running was 15.5 amps.
5.2 The unit was weighed at 840 pounds.
5.3 Film Handling System
5.3.1 The table was operated in split mode to insure that-the
cover could be closed when used in that fashion.
5.3.2 Position and operation of the bracket detents on the
motors and idler brackets were checked. The positioning is
positive and accurate. Visual indicators on the upper film
handling station provide a guide for proper positioning of
motors and brackets for different sizes and combinations of
film. The brackets can be locked in positions other than those
detented.
5.3.3 The design and position of the release lock to hold film
spools on the motor brackets has been changed. The release
operates easily, reels can be changed by one operator, and will
not catch on an operator's clothing.
5.3.4 70mm film was run on the table emulsion up and emulsion
down. At full speed, the film does track properly. It rode
on the fingers and was mechanically prevented from leaving
its proper position.
5.3.5 A roll of 9.5 inch film 880 feet long was rewound on
the table. Although the speed slowed considerably as the load
on the take-up spool increased, total rewind time was 1 minute
and 32 seconds. The speed exceeded 20 inches per second at all
times.
Approved For Release 20A5106123.:_.CIA-RDP78BO5171A000400030001-9
 Approved For ease 2005/06/23: CIA-RDP78BO517r0400030001-9
5.3.6 The tension under static conditions did not exceed
2 pounds per inch of film width.
5.4 Illumination Sources
5.4.1 The unformity of illumination was checked with the
Weston 759 foot lambert meter. The table was turned on and
allowed to warm up for 30 minutes. At the end of this time,
the maximum light output at the center of both formats was
read. This was found to be 3225 f L on the left side, and
3100 fL on the right side. For the left side, the minimum over
the entire format was 2100 fL, and 2500 over the restricted area.
The gradient, then, for the full format was 350, and for the
restricted area was 22.50 on the left side.
On the right, the minimum over the entire area was 2200
fL, and 2650 fL within the restricted area. The gradient
was 27% over the entire area, and 12% within the restricted
area.
5.4.2 The quality, or color, of illumination was measured
with a Gamma 3000 Scanning Spectroradiometer. Spectral
distribution was measured at 10mm increments from 380mm to
720mm, and at each of the four mercury spikes. This infor-
mation, with the aid of a modified NBS computer program,
produced the following information:
Correlated Color Temperature
4894 Kelvins
Color Rendering Index
72.45
X co-ordinate
0.3502
Y co-ordinate
0.3737
Approved For Release 2005/06723;: CIA-RD;P78BO5171A000400030001-9
 Approved For ease 2005/06/23 : CIA-RDP78BO51700400030001-9
These values met or exceeded the specifications set forth for
these parameters.
5.4.3 Certification of the absence of damaging ultra-violet
radiation was presented by
and accepted by NP?C.
5.5 Microstereoscope Mount Assembly
The focusing mechanism was tested for smoothness of action
and ability to hold the optics in focus.
In the coarse mode, each complete rotation moved the optics
0.306 inches. In the fine focus mode, one rotation moved the
optics 0.09 inches.
The optics did not drift downward with the weight of the
optics on the mechanism. A slip clutch was provided which
prevented the mechanism from driving the optics down into the
format surface. This slip clutch also allowed the operator to
raise the optics manually without cranking the focus mechanism.
5.6 Carriage Motion
5.6.1 Manual Movement
The force required to move the carriage manually in the X &
Y directions was checked. The specification of 4 pounds in any
direction was not exceeded.
5.6.2 Fail-Safe Y Switch
The system which prevents uncontrolled movement in the Y
direction was tested. No conditions were noted in which the
carriage moved in an uncontrolled manner when the table was
tilted.
Approved For Release 2005/06/23_:_CIA-RDP78B05171A000400030001-9
 Approved For ease 2005/06/23: CIA-RDP78BO517 0400030001-9
5.6.3 Motorized Movement
The operation of the motorized carriage movement was
thoroughly checked. The speed range was found to vary from
0.5 inches/second to 0.02 inches/second. It was found that the
motorized carriage, if actuated in X & Y, will not travel at
45 degrees as expected. The direction of travel will always
be shaded towards the Y direction.
5.7 An analysis of the noise output of the light table with
two webs of 6.6 inch film running at 20 inches per second and
the illumination at maximum reveals that there are some
excursions over the NC45 curve which is the limiting specifi-
cation. However, during the operational suitability inspection,
the operators did not consider the noise objectionable.
5.8 The parallellism, pod to glass, was checked with the
weight of optics on the optics carriage. Maximum deviation
was found to be 0.010 inches over the area accessible to the
center of the optics mount. This is within the 0.015 inches
specification.
Approved For Release 00,tVO6/23 : CIA-RDP78BO5171A000400030001-9
 Approved For ase 2005/06/23: CIA-RDP78BO51700400030001-9
Figure 2. Microscope Mount & Motorized Carriage Controls
Approved For Release 2005/06/23 : CIA-RDP78BO5171A000400030001-9
 Approved For ase 2005/06/23 : CIA-RDP78BO517100400030001-9
Figure 3. Pictograms used for Film Handling Controls
Approved For Release 2005/06/23 : CIA-RDP78BO5171A000400030001-9
 Approved For ase 2005/06/23: CIA-RDP78B051700400030001-9
Figure 4. Location and Configuration of Title & Elevation Controls
NOTE: Shield shown in photograph behind controls was not acceptable
and has been replaced.
Approved For Release 2005/06/23 : CIA-RDP78B05171A000400030001-9
 Approved For ease 2005/06/23: CIA-RDP78B0517#0400030001-9
Figure 5. Main On-Off Switch and Elapsed Time Meter
Approved For Release 2005/06/23 : CIA-RDP78B05171A000400030001-9
 Approved Foc 4 se 2005/06/23: CIA-RDP78BO5171)400030001-9
Figure 6. Rear Panel Access for Maintenance & Repair
Approved For Release 2005/06/23 : CIA-RDP78BO5171A000400030001-9
 25X1 Approved For Release 2005/06/23 : CIA-RDP78BO5171A000400030001-9
Approved For Release 2005/06/23 : CIA-RDP78BO5171A000400030001-9