Adelaide Testing Machines Inc.
61 Advance Road Units 5 and 6
Toronto, Ontario, Canada M8Z2S6
Phone: 1-800-665-8817 (Canada/USA)
Fax No.: 1-416-234-1369
EXT series of extensometers available from ATM include models for
testing a wide
range of materials including metals, plastics,
composites and ceramics. Their designs
incorporate a dual flexural
arrangement which makes them very rugged and insensitive to
vibrations. Many models are designed for application in both tension
General Purpose EXT3542 Series
1 shows a model from the EXT3542 series which are the standard series
from ATM. The 3542 series are a general purpose type of
extensometer for axial tensile,
compression, and cyclic testing. Gage
lengths are available from 0.50 - 2.0" (10 - 50 mm)
travel ranges from 5 -100% of gage length. These models come standard
Quick Attach Kit also shown in Figure 1which makes it easy to
mount the extensometer
on the test specimen in seconds. The
extensometer can also be mounted with the
included springs or elastic
bands. Figure 2 shows the dimensions of the different gage
the EXT3542 series of extensometers.
The EXT3542 extensometers
are full Wheatstone bridge strain gage type of devices which
directly compatible with the computer controlled ATM series of
testing machines such as the bench mounted TTS
series and the floor mounted D series.
The extensometer usually uses
the second DC conditioner amplifier included with these
The standard temperature range of the EXT3542 series is from -40 C -
(-40 F - 210 F).
Features of the EXT3542 Series:
- may be left on
through specimen failure.
- high accuracy with
some models offering 0.1% linearity.
- all models have
travel in both tension and compression and can be used
rugged, dual flexure design for improved performance.
- mechanical overtravel
stops in both directions.
replaceable arms and spacers for ease of repair. This also allowschanging
for different test requirements.
all units meet existing ASTM and ISO requirements for accuracy. All
ASTM class B-1, except for
the longest travel units, which meet class B-2.
hardened tool steel knife edges are easily replaced. A spare set
-standard Quick Attach Kit for quick, one hand mounting to specimens.
for both flat and round samples
(flats to 0.5 x 1.0" (12 x 25 mm) and rounds
up to 1 " (25
mm) diameter). Optional
arms available for larger samples.
- includes high quality
foam lined case.
high and low temperature options extend operation from as low
C (-450 F) up to 175
C (350 F).
Full Wheatstone strain gaged bridge design
Output: 2 - 4 mV/V,
Excitation: 10 VDC
typical, up to 15 VDC or VAC max
Standard is -40 C (-40F) up to 175 C (350 F)
Integral ultra flexible cable, 8 ft (2.5 m)
Model Number: EXT3542 - abcd - efg - hjk
where abcd is the extensometer Gage length as follows:
Gage Length, " abcd Gage Length,
0064 25.0 025M
0140 80.0 080M
where efg is
the extensometer travel length as follows:
Travel as % of Gage Length efg
50 / -10 050
/ -5 100
where hjk is the Temperature Range as follows:
Low -265 C to 100 C (-450 F to 210 F)
Std -40 C to 100 C (-40 F to 210 F)
High -40 C to 150 C (-40 F to 300 F)
High -40 C to 175 C (-40 F to 350 F)
Other Extensometer Series
addition to the EXT3542 series, ATM has available other types of
applications which cannot be accommodated by the
standard models in the EXT3542
series. Please contact ATM for
information on these other products.