Handbook of High Speed Photography - IET Labs, Inc.
Handbook of High Speed Photography - IET Labs, Inc.
Handbook of High Speed Photography - IET Labs, Inc.
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3.3 THE TYPE 1538 STROBOTAC® ELECTRONIC STROBOSCOPE.<br />
3.3.1 GENERAL DESCRIPTION. The 1538 (Figure 3-4) is an elec<br />
tronic stroboscope that combines several new, formerly unobtainable,<br />
features in a lightweight, moderately priced instrument. Although the<br />
appearance and general design are similar to those used in the 1531<br />
Strobotac, the 1538 is capable <strong>of</strong> a flashing rate six times as high —up<br />
to 150,000 flashes per minute, and its frequency stability is much bet<br />
ter than that <strong>of</strong> the 1531. The 1538 stroboscope has the additional<br />
features <strong>of</strong> either ac or dc operation (supplied by an accessory battery<br />
pack), an accessory remote lamp unit to illuminate in close quarters,<br />
and an accessory large capacitor to produce high-intensity flashes for<br />
single-flash photography. When the reflector <strong>of</strong> the 1538 is in place,<br />
the light output is concentrated into a long-throw 10-degree beam (mea<br />
sured at one-half-peak-intensity points) with an apparent source 18<br />
inches behind the reflector front. In addition, the 1538 employs solidstate<br />
circuits for zero warm-up time, so that the instrument may con<br />
veniently be turned <strong>of</strong>f when not actually in use.<br />
Figure 3-4. Type 1538-A Strobotac electronic stroboscope shown with<br />
accessories: 1538-P2 Extension Lamp; 1538-P3 Battery and Charger<br />
for portable operation; and the 1538-P4 Energy Storage Capacitor (shown<br />
mounted on the base <strong>of</strong> the 1538-A).<br />
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