Handbook of High Speed Photography - IET Labs, Inc.

Type1531-AB STROBOTAC*
ELECTRONIC
STROBOSCOPE
• "stops" rapid motion visually
• 1% accurate speed measurements to 250.000 rpm
• intense light source for high-speed photography
• simple to use — easy to handle
The Strobotac*. electronic stroboscope is a small port
able (lashing-light source used to measure the speed of
last-moving devices or lo produce the optical effect of
stopping or slowing down high-speed motion for observa
tion. A few of this instrument's many uses are:
• Observation and speed measurement of gears, cams,
linkages, shuttles, spindles, motor rotors, and any other
elements having repetitive motion.
• Observation of vibrating members, fuel-nozzle spray
patterns, and vibrations of components under test in
wind tunnels.
• High-speed photography of repetitive or non-repetitive
motion.
The flashing-rate range of 110 to 25.000 flashes per
minute is divided into three direct-reading ranges; to
avoid reading errors, only Ihe particular range in use is
illuminated. The flash lamp caii be triggered externally
lo "stop" motion for photography. The combination of the
1531-P2 Flash Delay and the 1536-A Photoelectric Pickoff
can be used as an external triggering source, which also
provides 3n adjustable delay of the stroboscope flash with
respect to the triggering pulse from the photoelectric
pickoff.
A built-in calibration system uses the power-line fre
quency lor quick, easy check and readjustment of the
flashing-rate calibration.
The strobotron flash lamp and reflector assembly pivots
in a plane perpendicular to the panel and swivels 360
degrees on its own axis. The case is equipped with a
V* x 20 socket for mounting the instrument on a tripod.
This instrument is listed as approved by CSA Testing
Laboratories.
specifications
Flashing-Rate Ranee: 110 to 25.000 '•.ashes per minute in three
direct-reading ranges: 110 to 690, 670 to 4170, and 4000 to 25,000.
Speeds up to 250,000 rpm can be measured-
Accuracy: ~ 1% of dial reading after calibration on middle range.
Calibration: Two panel adjustments permit calibration against
power-line frequency.
Flash Duration: Approx o.ft. 1.2, ond 3 «s for high-, medium-, and
low-speed ranges, respectively, measured at "^i peak intensity.
Peak Light Intensity: Typical On .high-, medium-, and low-speed
ranges, respectively, O.G, 3.5, and 11 million beam candel.ls (6
x 10\ 3.5 x 10', and 11 x 10> lu« at I meter distance at the
center of the beam); lor single Hash. Ill million beam candelos
(IB X IO lux at 1 motor distance at Ihe center of the beam).
Photographic Euide number is 30 for ASA 400 film speed and high-
Intensity flash.
Reflector Beam Angle: 10"
at half-intensity points.
Output Trigger: 500- to 1000-V negative pulse available at panel
lack.
External Triggering: The flash can be triggered by the opening of
a mechanical contactor or by a 6-V pkpk signal (2-V rms sinewave
signal down to 5 He).
Power Required: 105 to 125 or 210 lo 250 V, 50 to 400 Hz. 35 W.
Accessories Supplied: Adjustable neck strap, plug to fit input and
output Jacks.
Accessories Available: 1531-P2 Flash Delay and 1536-A Photo
electric Pickoff. 1539-A Slroboslave with 153I-P4 Trigger Cable.
Mounting: Flip-Till Case.
ensions fwidlli x height x depth), 1011. x GSfc x 6li in. (270
I/Ox 160 l
Weight: Net. 7V4lb (3.3 kg); shipping. 9 lb (.1.1 kg)
IS31-AB Strobotac
stroboscope
115-V oc Model
230-V ac Model
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