G.R.A.S. 45AA Telephone Test Head

IEC 60318 or IEC 60711 depending on configuration

When used with G.R.A.S. 43AD articitial ear or G.R.A.S. 43AE IEC 60711 ear simulator, and a G.R.A.S. 44AA/G.R.A.S. 44AB mouth simulator, it can be set up for testing telephone handsets in accordance with ITU-T recommendations.

Positioning of the mouth
Four different, detachable precision brackets are provided for mounting the Mouth Simulator according to the standardised positions shown in the table for speaking into a telephone. These positions are maintained to within an accuracy of 1 mm. Reference gauges are available for verifying this.

Speaking Position Recommendation
AEN ITU-T Rec. P76

Anti-vibration Mounts
The G.R.A.S. 45AA stands on four anti-vibration mounts to isolate it from extraneous vibrations which could otherwise lead to spurious measurement results.

Handset Alignment
The G.R.A.S. 45AA is provided with graduated guides and stops for aligning a telephone handset correctly in position over the Artificial Ear. Lateral guides are independently adjustable to cater for asymmetrical handsets.

Once aligned, an adjustable spring-loaded, padded clamp will hold the handset in position. As specified in some tests, an adjustable force may also be applied by adding a small mass to the measurement object.

IEC standard Dep. on conf.
ITU-T recommondations Dep. on conf.
CE/RoHS compliant/WEEE registered Yes/Yes/Yes
Weight g / oz 2300 / 81.13
G.R.A.S. Sound & Vibration reserves the right to change specifications and accessories without notice.

Included items


4 different brackets for selecting direction of the Mouth Simulator


Optional items

Notice that for creating a complete order list you need to find relevant accessories for the chosen
G.R.A.S 44AA, 44AB, 43AD and 43AE products. See www.gras.dk.

For test of the microphone in the handset

G.R.A.S. 44AA

Mouth Simulator (with built-in amplifier)

G.R.A.S. 44AB

Mouth Simulator

For test of the earpiece in the handset

G.R.A.S. 43AD

Artificial Ear for Telephone Test Head (IEC 60318)

G.R.A.S. 43AE

Ear Simulator (IEC 60318-4)
(includes G.R.A.S. RA0056 Low-Leak Pinna Simulator & RA0057 High-Leak Pinna Simulator)

For verifying the position (AEN & REF) of the Mouth Simulator

G.R.A.S. RA0141

Reference Gauges

G.R.A.S. Sound & Vibration reserves the right to change specifications and accessories without notice.