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.
|LRGP||ITU-T Rec. P76|
|AEN||ITU-T Rec. P76|
The Type 45AA stands on four anti-vibration mounts to isolate it from extraneous vibrations which could otherwise lead to spurious measurement results.
The Type 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.
|Connector type||3 m 7-pin LEMO Cable|
|Set sensitivity @ 250 Hz (±2 dB)||mV/Pa||TBD|
|Set sensitivity @ 250 Hz (±2 dB)||dB re 1V/Pa||TBD|
|Theoretical dynamic range lower limit with G.R.A.S. preamplifier||dBA||TBD|
|Theoretical dynamic range upper limit with G.R.A.S. preamplifier @ +28 V / ±14 V power supply||dB||TBD|
|Theoretical dynamic range upper limit with G.R.A.S. preamplifier @ +120 V / ±60 V power supply||dB||TBD|
|Theoretical dynamic range upper limit with G.R.A.S. CCP preamplifier||dB||TBD|
|Humidity range non condensing||% RH||TBD|
|IEC standard||60318-1 & -2 (former 60318)|
|Weight||g / oz||/ TBD|