digiClip digital clip-on extensometers

Digital clip-on extensometer

These highly efficient and cost-effective extensometers offer significant advantages over strain-gage systems in terms of measuring range, accuracy and signal processing.

digiClip is available from ZwickRoell in four different versions for extension and/or change-in-width measurement. This digital system delivers uniform accuracy over the entire gauge length. digiClips' compact design is made possible by miniaturizing the digital scale. Furthermore, the lightweight measuring system is positioned very close to the specimen. Thus, the loading of the specimen is minimized.

Function description

There is consistent accuracy across the entire gage length in an incremental system. The clip-on extensometer's compact design is made possible by minimizing the size of the incremental scale. The lightweight measuring system is positioned very close to the specimen. Thus, the loading of the specimen is minimized.

The range of application of the digiClip clip-on extensometer is expanded even further by the number of different initial gage lengths available and through the flexible change in measurement travel that can be switched from "Tensile only" to "Tensile and compression" at extension.

Advantages and features

Very high resolution and accuracy over the entire measuring range.
During extension measurement the measuring range can be switched from "Tension only" to "Tension and compression".
Low overall height allows digiClip to be used for small grip-to-grip separations, while its low weight and compact design minimize the load on specimen.
Adjustable depth-stop with scales for common specimen widths helps to ensure that the clip-on extensometer is always attached centrally to the specimen.
Very high resolution (0.02 µm) in all versions.

Advantages of digiClip short and digiClip long

Additional knife-edges for notch-sensitive specimens included in delivery
Adjustable initial gauge lengths
Initial gauge length automatically locked at attachment and unlocked at release
Guaranteed high-resolution Young's modulus determination as per ISO 527-1
Maximum error of ±1 μm in differential displacement measurement between two measurement points in a range from 20 μm to 200 μm, completely satisfying the additional requirement as per ISO 527-1 (2011)
Approved for closed-loop strain-rate control as per ISO 6892-1 (2009) Method A (1) and ASTM E8 – 09 Method B
Mounting bracket for attachment to load frame plus fall protection included in delivery.

digiClip transverse

The digiClip transverse strain extensometer is designed for the r-value determination on metals according to standards ASTM E517 and ISO 10113. The extensometer is ideal for determination of the Poisson’s ratio on plastics and composites according to DIN EN ISO 527-1/-2/-4 in a tensile test. In addition, it can be used to determine the in-plane shear behavior of fiber-reinforced composites in a ±45° shear test.

Function description

The biaxial extensometer digiClip is a manual clip-on extensometer. It is attached direct on the specimen and determines the extension as well as the change in width at one measurement line.

Technical overview

Description	Value
Type	digiClip, short
Item No.	078779
Initial gauge length
Convertible	20/25/25.4/30	mm
optional	45/50/50.8/55¹/60/75/80/85¹	mm
Measurement travel
For tension	-0.2 ... 13.5	mm
For tension and compression	-5.2 ... 8.5	mm
Specimen dimensions
Round specimens	Up to Ø 20	mm
Flat specimens (d x w)	Up to 20 x 30	mm
Resolution	0.02	μm
Accuracy	Class 0.5	to EN ISO 9513
Mounted height
At L₀ 20, 25, 30	36	mm
At L₀ 50	60	mm
At L₀ 80	90	mm
At L₀ 100	-	mm
At 55 < L₀ ≤ 65	-	mm
At 65 < L₀ ≤ 105	-	mm
Weight, approx.	100	g
Securing device included	Yes
Ambient temperature	+10 ... +35	°C
Housing color	RAL 7011

Changing the measurement range: see values in the measurement range for tension and compression

Description	Value
Type	digiClip Long
Item No.	078781
Initial gauge length:
Convertible	50/50,8 (2")/55¹	mm
optional	65/70¹/75/80/85¹/100/105¹	mm
Measurement travel:
For tension	-0.2 ... 40	mm
For tension and compression	-5.2 ... 35	mm
Specimen dimensions
Round specimens	Up to Ø 20	mm
Flat specimens (d x w)	Up to 20 x 30	mm
Resolution	0.02	μm
Accuracy	Class 0.5	to EN ISO 9513
Mounted height
At L₀ 20, 25, 30	-	mm
At L₀ 50	77	mm
At L₀ 80	90	mm
At L₀ 100	110	mm
At 55 < L₀ ≤ 65	L₀ + 5	mm
At 65 < L₀ ≤ 105	L₀ + 10	mm
Weight, approx.	170	g
Securing device included	Yes
Ambient temperature	+10 ... +35	°C
Housing color	RAL 7011

Changing the measurement range: see values in the measurement range for tension and compression

digiClip Transverse for AllroundLine and zwickiLine testing systems
With a fixed measurement line

Type	digiClip Transverse
Item No.	078783
Measurement range
Setting 1	8.5 ... 20	mm
Setting 2	13.5 ... 25.4	mm
This results in
At a specimen width of 10 mm	1.5	mm
At a specimen width of 15 mm	6.5	mm
At a specimen width of 20 and 25.4 mm	11.5	mm
Specimen dimensions
Flat specimens (d x w)	Up to 6 x 10 ... 25	mm
Resolution	0.02	μm
Accuracy	Class 0.5	to EN ISO 9513
Mounted height	42	mm
Weight, approx.	115	g
Securing device included	Yes
Ambient temperature	+10 ... +35	°C
Housing color	RAL 7011

Type	digiClip Biax
Item No.	078785
Measurement travel for extension
For tension	-0.2 ... 41.5	mm
Measurement travel for change in width (with a fixed measuring line)
At a specimen width of 10 mm	1.5	mm
At a specimen width of 15 mm	6.5	mm
At a specimen width of 20 and 25.4 mm	11.5	mm
Specimen dimensions
Flat specimens (d x w)	Up to 4 x 10 ... 25	mm
Resolution	0.02	μm
Accuracy	Class 0.5	to EN ISO 9513
Mounted height	90	mm
Weight, approx.	300	g
Ambient temperature	+10 ... +35	°C
Temperature during storage and transport	-20 ... +55	°C
Housing color	RAL 7011

Description	Value
Type	digiClip High-Capacity
Item No.	023528
Initial gauge length:
Convertible	20/25/25.4/30	mm
Optional	50/80/100	mm
Measurement travel:
For tension	-0.2 to 13.5	mm
For tension and compression	-5.2 to 8.5	mm
Specimen dimensions
Round specimens	Ø 5 to 70	mm
Flat specimens (d x w)	20 up to 70 x 75	mm
Resolution	0.02	μm
Accuracy	Class 0.5	To EN ISO 9513
Overall height
At L₀ 20, 25, 30	36	mm
At L₀ 50	60	mm
At L₀ 80	90	mm
At L₀ 100	110	mm
At 55 < L₀ ≤ 65	please enquire	mm
At 65 < L₀ ≤ 105	please enquire	mm
Ambient temperature	+10 to +35	°C