GAM – Gyratory internal Angle Measurer

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SKU: B041-28

GAM – Gyratory internal Angle Measurer

STANDARDS: EN 12697-31 / ASTM D7115 / AASHTO T344

This Gyratory Angle Measurer has been designed by MATEST to provide an angle validating device which can be used by

the operator to carry on the calibration of the Gyratory Compactor.

The device perfectly simulates a HMA specimen as it generates an equivalent tilting moment and shear forces.

GAM can cover a wide range of angles, including the ones specified by EN and ASTM Standards.

The device allows to perform TOP and BOTTOM angle measurements as specified by the Standards; the average of the obtained values is

then considered as the “internal angle of the machine”.

An excel spreadsheet, which is supplied along with the device, is used for data acquisition and processing, and provides the precise value of

the internal angle according to the calculation procedure specified by EN 12697-31 (Annex-C) and AASHTO T344.

The spreadsheet allows to plot several graphs showing the measured data and it also provides some important indexes about the quality of

the data.


– High accuracy of the measured data

– The device is supplied complete with:

• Two different rings to perform tests either with M=240Nm

or M=425Nm

• Upper and lower base plate

• RS232 cable

• Strong practical suitcase

• Calibration certificate

– Data are read by GAM and then downloaded (via RS232 cable)

all together at the end of the measurements, with no need to

connect the device to the PC after each measurement

– Possibility to repeat even just one of the measurement,

and lately include it in the calculation


– Data processing is carried out by a specific spreadsheet,

which also allows to create the final calibration certificate

– No need for power supply since the device is battery operated.

Also it has an energy saving feature which automatically switch off

the device if it is not being used for a while.


– Connection to PC through RS232 cable

– Three modes of data acquisition: Single, Partial or Complete

– Accuracy: more than 0.01°, as requested by the Standards

Power supply: n°2 batteries 1.5V type AA

Dimensions: Diameter 150mm , Height 115mm

Weight: 5.6 kg



(1.16° angle). The set is composed by two square rules.

Supplied complete with factory certificate.


(0.82° angle). The set is composed by two square rules.

Supplied complete with factory certificate.

B041-55 ACCREDIA Official Calibration Certificate of the angle,

for the square rules (ASTM and EN).

Excel spreadsheet: it allows several operation to be carried on

(data acquisition, data processing, visualization of graphs,…)