Ear Plate Assemblies
On the inside of the Ear Plates, the Fittings for 60218-1 Ear Simulator and Flanges for 1/2” and
1/4” microphones are mounted as shown in Fig. 4. On the outside a positioning system for hold
-
ing the cups of the headphones are mounted. This is shown in Fig. 6 on page 24.
The Fittings for Microphone Mounting
As can be seen from Fig. 4 below, the microphones are mounted from the inside. The
Ear Plate
can accommodate the Ear Simulator or the Flanges for 1/2” or 1/4” microphones. These have the
same outer dimensions and are mounted the same way, with three screws and fasteners. There
-
fore, it is fairly easy to reconfigure a 45CC, for example from a version with 1/2” microphones to
IEC 60318-1 ear simulators.
The
GR1997 Holder
is used with the RA0039 Ear Simulator only, as the thread it provides is an
integral part of the two flanges.
12mm
Back
Front
Guide
pin
0
+1
0
-10
5
5
A
0
+1
5
-1
5
0
+1
5
-1
5
4 mm Allen
Key
Ear Plate
GR1997
Holder
GR2013
Microphone holder
Ear Simulator
Flange for 1/2" mic.
Flange for 1/4" mic.
Fig. 4.
Detailed view of the fittings for ear simulator mounting. The mounting of the 1/2” and 1/4” Micro
-
phone Flanges is similar, except that the GR1997 Holder in the middle is an integral part of the two flanges.
Instruction Manual
GRAS 45CC Headphone Test Fixture | 2 3
