For measurements of the insertion loss of ear muffs and ear plugs, and the sound quality of ear
-
phones and headphones, 45CA-5 or 45CA-6 can be used. They are configured with pinna simula
-
tors and either externally polarized or prepolarized ear simulators.
These configurations comply with IEC 60318-4.
080015
Analyzer with hardware and
software for simulating:
a signal generator capable of
generating the required test
signals
an audio frequency analyser
capable of ⅓
-octave band
analyses
Loudspeaker
To analyzer
Power amplifier
Earplug under test
12AA Power
Module
From RA0045
Ear Simulators
45CA Test Fixture
G.R.A.S.
Power Module
Type 12AA
Battery
On
A
B
Calibration
Overload
Overload
Gain A
0
Gain B
-20
+20
+40
+40
+20
-20 0
In A
In B
080001
Fig. 3.
Typical application setup for testing of earplugs. Here a configuration with externally polarized ear
simulators is shown.
Test setups for the configurations 45CA-7 till 45CA-12 are similar to the one shown above.
Instruction Manual
2 0 | GRAS 45CA Headphone/Hearing-protector Test Fixture