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OPERATING PROCEDURE.
To operate the
1543:
a. Plug the power cord into a 115-V 50/60
Hz
source
(standard ac I ine socket)
.
b. Depress the ON -OFF button to turn the strobe
on.
c.
Depress the switch that corresponds to the desired
mode of
operation.
NOTE
One of the mode buttons must be depressed
before the
strobotac
wi II
operate.
d.
Point the strobe light toward the motion to be
stopped.
e.
Except for the EXTERNAL-TRIGGER mode, rotate
the flash-rate knob until the visual image of the motion
stops. The visual image may be made to move slowly
Figure 2. Rear-view showing controls, connector and indicator.
through its cycle by a slight readjustment of the knob
setting in either direction.
Note:
This is a ten-turn control
without positive
stops.
MODES OF OPERATION.
Normal.
In the NORMAL mode of operation the strobotac will
flash at a rate determined by the flash-rate control setting.
The number of flashes can be varied between 3 and 63
flashes/sec.
When stopping the motion of an object, it is recommen-
ded that the dial be initially set to the high
end.
Then,
slowly reduce the flashing rate until the object motion is
stopped.
The dial markings are approximate indications of the
flash
rate.
Following is a procedure that can be used to
accurately calibrate the dial and is useful as a lab project for
students or for special industrial applications:
a. Fasten a disk to the shaft of a synchronous motor
(such as the Bodine Electric
Co.
model no. NSY-12) and
make a single mark on the outer surface of the
disc.
b. Cover the flash-rate dial of the strobotac with masking
tape.
c.
Turn on the strobotac and the synchronous
motor.
d.
Depress the NORMAL mode button and train the
strobe light on the outer surface of the rotating disk.
e.
Turn the flash-rate dial fully cw (hignest flash rate).
f. Slowly turn the dial ccw until the first double image
of the mark on the rotating disk appears. Mark this position
on the flash-rate dial as 3600 rpm, using the mark on the
instrument case as a
reference.
g. Continue turning in a ccw direction and mark the dial
to correspond with Table
2.
This calibration is temporary, inasmuch as it may change
with ambient temperature or line voltage. To recalibrate
simply remove the masking tape and ·repeat the above
procedure.
Table 1
2
Fig. 2
Item
2
3
4
5
6
7
Name
EXTERNAL TRIGGER
LINE FREO SUB-MUL T
NORMAL
ON-OFF
CONTROLS, CONNECTOR, AND INDICATOR
Description
On-off
,
pushbutton control
On-off
,
pushbutton control
On-off, pushbutton control
1 0-turn potentiometer
(without stops)
Flash
-rate
dial
,
marked 500
to 3500
On-off, pushbutton control
Phone jack, mates with %-in
.,
Switchcraft Type 40, two
conductor plug or equivalent
Function
Selects EXTERNAL TRIGGER mode of operation
Selects LINE FREO SUB-MULT mode of operation
Selects NORMAL mode of operation
.
Varies flash rate between 180 and 3780 flashes/min
.
Indicates approximate flash rate per minute
Turns instrument on or off
Accepts EXTERNAL TRIGGER input (contact
closure only)
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