The GRAS 43AB Artificial Ear is a complete test-jig for acoustical measurements on hearing aids.
Technology
The GRAS 43AB Artificial Ear is a complete test jig for acoustical measurements of hearing aids in accordance with IEC 60318-5 (60126) and ANSI S3.7 -1995 on insert type hearing aids in accordance with:
- IEC 60318-5 (60126) reference coupler for the measurement of hearing aids using earphones coupled to the ear by means of ear inserts.
- ANSI S3.7-1995 American National Standard for Coupler Calibration of Earphones.
The 43AB comprises:
- IEC 60318-5 (60126) 2-cm³ Coupler GRAS RA0038
- GRAS 40AG ½" Pressure Microphone
- GRAS 26AC ¼" Preamplifier
- GRAS RA0052 Test Jig
- Studs and moulds for BTE and ITE instruments
The Test Jig has an adjustable spring-loaded arm to exert a variable force on the test object.
Specifications
| Parameter |
Unit |
Value |
| Theoretical dynamic range lower limit with GRAS preamplifier |
dB(A) |
25 |
| Theoretical dynamic range upper limit with GRAS preamplifier @ +120 V / ±60 V power supply |
dB |
164 |
| Set sensitivity @ 250 Hz (±2 dB) |
mV/Pa |
12 |
| Set sensitivity @ 250 Hz (±2 dB) |
dB re 1V/Pa |
-38.5 |
| Coupler volume |
mm³ |
0.4 ccm |
| Temperature range, operation |
°C / °F |
-30 to 60 / -22 to 140 |
| Temperature coefficient @250 Hz |
dB/°C / dB/°F |
-0.01 / -0.006 |
| Humidity range non-condensing |
% RH |
0 to 80 |
| ANSI standard |
– |
S3.7 Type 2 (HA-1, HA-2) |
| IEC standard |
– |
60318-5 (former 60126) |
| ITU-T recommendations |
– |
P.380 |
| CE/RoHS compliant / WEEE registered |
– |
Yes / Yes / Yes |
| Connector type |
– |
3 m 7-pin LEMO |
| Weight |
g / oz |
1.55 / 54.675 |
