Stroboscope
1531-A/B and 1538-A Strobotac Series
Strobotac provides two high quality
models to chose from to fulfill your
electronic stroboscopic needs.
The 1531-AB for most applica ons
and the 1538-A for situa ons re-
quiring very high
fl
ash rates.
Both instruments offer proven reli-
ability and are s ll manufactured
to the same exac ng GenRad speci-
fi
ca ons.
Features:
Model 1531-AB
• Flash rates up to 25,000 fpm with
accuracy of +1.0%
• Unique, rugged carrying case for
portability
• Flash dura on ranging from 0.8
μs
to 3.0
μs
for
• clear, crisp images
Model 1538-A
• High Speed, adjustable
fl
ash rates
up to 150,000 fpm
• Direct reading in four ranges with
±1.0% accuracy
• Flash dura on from 0.5
μs
to 3.0
μs
for clear, crisp images
• Unique, rugged carrying case for
portability
• Can be ba ery operated
Versa le synchroniza on:
A variety of trigger inputs can be
used for
fl
ash synchroniza on.
Contact closures, pulses, or sinu-
doidal signals will trigger the
fl
ash,
and an output trigger is provided so
the stroboscope, in turn, can trigger
another device.
Single-flash photographs of high-
speed mo on are a snap with any
s ll camera.
The 1531-AB and 1538 are designed
using the same construc on which
allows interchangeability of internal
assemblies, regardless of the age of
the stroboscope.
Page 1 of 2
1531-AB Stroboscope
1538-A Stroboscope
DESCRIPTION
Compact and accurate. These
strobes are small portable
fl
ashing-
light sources used to measure the
speed of fast-moving devices or to
produce the op cal effect of stop-
ping or slowing high-speed mo on
for observa on.
A build-in system uses the power-
line frequency for quick and easy
checks and adjustment of the
fl
ash-
rate calibra on.
Each
fl
ash lamp/reflector assem-
bly is hinged at the panel and the
reflector swivels 360 degrees, for
complete
fl
exibility.
The cases have an integral carry
handle and protect the stroboscope
in a metal
fl
ip-case.
The differences:
The 1531-AB is more economically
priced.
On the other hand, the 1538 gives
you six mes the maximum
fl
ash
rate of the 1531, and enables por-
table opera on with an op onal
rechargeable ba ery.
The 1538-A can also be used with
an op cal extension lamp and high
intensity
fl
ash capacitor op ons.
1538-9603 Battery Source and Charger
1538-9601 Lamp for 1531 and 1538
1538-9602 Extension Lamp
1538-9604 High Intensity Flash Capacitor
IET LABS, INC.
in the
GenRad
Tradition
www.ietlabs.com
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
1531-1538 Catalog Pages June 2018
Stroboscope
1531-A/B and 1538-A Strobotac Series
SPECIFICATIONS
Page 2 of 2
1531-AB:
Flash Rate:
110 to 25,000fpm in 3 ranges; speeds up to
250,000rpm can be measured.
Accuracy:
±1% of reading after calibration on one range against 50-to-60Hz line
frequency.
External Trigger:
Input and output connections are phone jacks.
Input: Contact opening, pulse
≥
+6V pk-pk, or sinewave
≥
2V rms for
f>5Hz.
Output: Negative pulse
≥
500 to 1000V
Light Output:
Beam width 10º degrees at ½-intensity points.
1538-A:
Flash Rate:
110 to 150,000fpm in 4 ranges; speeds up to 1,000,000 rpm can be
measured.
Accuracy:
1% of reading after calibration on 670 to 4170fpm range against
50-to-60Hz line frequency.
External Trigger:
Input and output connections are phone jacks.
Input: Contact closure, pulse
≥
+1V pk-pk, or sinewave
≥
0.35V rms
for f>5Hz (3.5V at 10Hz)
Output:
≥
+6V behind 400
Ω.
Light Output:
Beam width 10º at ½-intensity points.
Flashes per
minute
at 690
at 4170
at 25,000
Duration*
(µs)
3
1.2
0.8
Energy**
(watt-seconds)
0.5
0.09
0.014
Beam intensity***
(candela)
15 x 10
6
5 x 10
6
1 x 10
6
0.16 x 10
6
Flashes per
minute
at 690
at 4170
at 25,000
*
Duration*
(µs)
3
12
0.8
Energy**
(watt-seconds)
0.5
0.09
0.014
Beam intensity***
(candela)
11 x 10
6
3.5 x 10
6
0.6 x 10
6
Measured at 1/3 peak intensity.
** Electrical input to lamp.
*** Measured with silicon photo detector 1 meter from lamp;
single-flash beam intensity is 18 x 106 candela
at 150,000
0.5
0.0023
* Measured at 1/3 peak intensity.
** Electrical input to lamp.
*** Measured with silicon photo detector 1 meter from lamp; single-
flash beam intensity with - P4 is 44 x 10
6
candela
Power:
100 to 125 V, or 200 to 250 V, 50 to 400 Hz,
25 W max for 1531, 15 W max for 1538;
1538 can also be powered from 20 to 30 V DC, 12 W max.
Mechanical:
Dimensions:
Weight:
Flip-Tilt Case.
16.8 cm H x 27.0 cm W x 15.6 cm D
(6.63" x 10.63" x 13")
3.5 kg (7.5 lb.) net, 4.6 kg (10 lb.) shipping
ORDERING INFORMATION
Catalog Number
1531-9430
1531-9440
1538-9701
1538-9702
Item
1531-AB
1531-AB
1538-A
1538-A
Line Voltage
(V)
115
230
115
230
Accessories for 1531 and 1538
Calibration data
1538-9601 - 1538-P1 Replacement
Strobotron flash lamp, or 1531/1538
Accessories for 1538-A only:
1538-9602 - 1538-P2 Extension Lamp
1538-9603 - 1538-P3 Battery and Charger
1538-9604 - High Intensity -Flash Capacitor;
increases output light output by approximately
6 times.
Includes:
Power cord
Calibration certificate traceable to SI
Phone plug for input and output jacks
IET LABS, INC.
in the
GenRad
Tradition
www.ietlabs.com
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
1531-1538 Catalog Pages June 2018
IET cat/1531-1538/05-01-06
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