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INSTRUCTIONS
General Radio
I
MOUNT INSERT
(HIDDEN)
REFLECTOR
-
COVER
SLOT
Figure 1. Type 1543 Strobotac.
PURPOSE.
The Type 1543 Strobotac produces a bright flashing
light over a wide flash-rate range to stop
motion.
It is well
suited for use in industrial applications as an engineering or
maintenance tool, as
part
of a photography setup, or as an
aid
in
the
classroom.
Additionally, it is small, light, simple
to operate and
inexpensive.
DESCRIPTION.
(Figure 1)
The 1543 features simple pushbutton
control
with a
single
knob
to
control
the flash
ra.
t e- no range switching is
necessary.
An uncalibrated dial indicates the approximate
number of flashes
per
minute.
Modes of operation are:
normal, line frequency sub-multiple, and external trigger.
The light output is electronically
compensated
for relatively
constant
subjective brightness (as the flash rate decreases,
the light intensity increases)
.
The
instrument is
housed in a high inpact plastic
case
that
is shaped
for
comfortable
hand-held operation.
Alternatively, a threaded hole is provided for mounting on
a tripod or a bail-type
stand.
The stand (supplied) doubles
as a
carrying
handle or a bracket to hang the instrument in
a
convenient
location.
MOUNTING.
A stainless-steel insert, which will accept a standard
1/4-20 tripod thread, is built into the bottom of the
case
for bail or tripod
mounting.
To tripod mount the strobotac
remove the bail by turning its
knob ccw.
Screw the
threaded end of the tripod pan head into the insert and
hand tighten.
Type 1543
Strobotac®
(Electronic Stroboscope)
specifications
Flash Rate
180 fpm
3800 fpm
Duration'
4J.LS
6J.LS
Watt Seconds
0.6
0.16
Beam Candella
2
30X10
6
4X10
6
Beam Width
3
11°
11°
1. Measured at peak-intensity points. 2. Measured with
silicon photodetector 1 meter from lamp
.
3. Measured
at
Y.
intensity points.
External Trigger: Std. phone jack, operated by
contact-closure
device.
Sub·Mult Mode: Provides
±0.1%
accuracy by
synchronizing
to submultiples of the line frequency
.
Environmental: TEMPERATURE: 0 to 50°C
operating, -40
to
75°Cstorage. Humidity: 95% RH at+40°C.
Power: 105 to 125 V, 50 to 60Hz, 25 W max
.
Mechanical:
DIMENSIONS
(wxhxd):
4.2X6.19X7.8
in.
(107X157X198 mm). WEIGHT
:
3.51b (1.6 kg) net, 51b (2.3 kg)
shipping.
Catalog
Number
Description
1543-9700
1543 Strobotac
1530-9410
.
Replacement Strobotron Flash Lamp
CONTROLS, CONNECTOR, AND INDICATOR.
The
controls, connector,
and indicator are listed and
described
in
Table 1. Refer to the illustration of Figure
2.
PRELIMINARY CHECKS.
With the power
connected,
depress the ON-OFF and
NORMAL buttons. Turn the flash-rate
knob
through its
range
-
there should be no erratic action of the flash tube.
Set the flash-rate knob to the high end and depress the
LINE-FREO-SUB-MULT button. The instrument is now
synchronized with the line at 3600 flashes per min. Slowly
turn the dial in a
ccw
direction. The flash rate will
change
at 3600/2, the first submultiple of the line frequency.
Additional changes in the flash rate will be noticed as the
dial is turned toward the low end. These changes corres-
pond to other submultiples of the line frequency. Do not
expect the flash rate to
change
continuously in this
mode.
Depress the EXTERNAL TRIGGER button and connect
a contact-closure device (such as a switch) isolated from
ground to the rear-panel phone jack. The strobe should
flash each time the device is activated.
FORM NO. 1543-0100-A
©GENERAL RADIO COMPANY
DECEMBER 1971
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