Tektronix 3 - Page 3

SECTION 1
CHARACTERISTICS
No. 3 Electric Shutter and Speedcomputer
The No. 3 Electric Shutter and Speedcomputer? system
consists of a solenoid-operated shutter and a unit containing
a power supply and timing circuitry. The system has been
designed so that the Electric Shutter can replace the existing
mechanical shuter in any of the lenses which can be used
with the C-12, C-13, C-19, C-27 and C-40 camera systems.
The Electric Shutter/Speedcomputer system permits elec-
trical triggering of the camera shutter. It can also be used
to trip more than one camera shutter simultaneously by con-
necting the required number of systems to one remote switch-
ing control.
The Speedcomputer is supplied in a small box which can
be easily attached to the camera back (by using the mount-
ing bracket Tektronix Part No. 122-0713-00) or the Speed-
computer may be set on an object near the camera.
ELECTRICAL CHARACTERISTICS
NOTE
In the following description, the below listed de-
finitions and criteria established by the United
States of American Standards Institute shall apply:
Items 2.1 and 4.3 of USA Standard PH3.32-1959;
Item 3.1 of USA Standard PH3.18-1957.
TABLE 1-1
Electric Shutter
No. 3 Electric Shutter
Synchronization
Determined by Electric Shutter (see
Table 1-1).
Shutter-open Indication
Indicator light turns on when shut-
ter blades are more than 80%
open.
Remote Actuation
Accomplished by connecting pins
A and C of J20 together or by sup-
plying +27 VDC to pin A of J20;
using pin B of J20 as ground.
Line Voltage
115VAC +10%, 50-60 Hz. Can
be converted for 230 VAC +10%,
50-60 Hz operation.
Power Indication
Indicator light turns on if power
is applied to instrument when ON-
OFF switch SW 1 is ON.
TABLE 1-3
Physical Characteristics
Characteristic
Description
Finish:
Electric Shutter
Die-cast aluminum finished with
grey paint. The identification plate
is anodized aluminum.
Characteristic Performance Requirement
Internal; X-Type, as described in
3.1 of USA Standard PH3.18-1957
Synchronization
Speedcomputer Aluminum case is finished with
textured black vinyl paint. The
front-panel is anodized aluminum.
Dimensions:
Electric Shutter
3 5/16 inches diameter X 1 inch
thick.
Speedcomputer
4 1/2 inches long X 3 1/16 inches
wide X 3 1/8 inches deep.
TABLE 1-4
Environmental Characteristics
Characteristic
Performance Requirement
Action Actuated by Speedcomputer
Actuation Voltage
Initial Pulse At least 120VDC; at least 5ms
in duration
Holding Voltage At least 20 VDC
TABLE 1-2
Speedcomputer
Characteristic Performance Requirement
Output Voltage
Initial Pulse At least 120 VDC; at least 5 ms in
duration
Holding Voltage At least 20 VDC
Time (T), 4, 2, 1, Vo, V4, Ve,
1/15, 1/30, 1/60 second and Bulb
(B)
Exposure-time Settings
Temperature
Operating 0°C to +50°C
Non-operating —40°C to +65°C
Altitude
Operating To 15,000 feet
Non-operating
To 50,000 feet. Refer to tempera-
ture characteristic for lowest al-
lowable temperature.
Within 20% of exposure-time
markings in a temperature range
of 0°C to +40°C. (In accord-
ance with item 4.3 of USA Stand-
ard PH3.32-1959.)
Exposure-time Accuracy
Vibration:
Operating?
15 minutes in each of the three
planes at 0.010 inch double ampli-
tude. Vary frequency from 5 to 55
to 5 c/s in 1-minute cycles.
Registered trademark of the Ilex Optical Company.
“Electric Shutter and Speedcomputer mounted on a camera in a normal
manner.
1-1