4.5
Typical Application Setup
Fig. 4.16 shows a block diagram of an application setup for testing the insertion loss of a pair of
ear-protection muffs.
Fig. 4.16 Block diagram of a setup for testing a pair of ear-protection muffs.
For binaural measurements, you can replace the single-channel Power
Module Type 12AK with the dual-channel Power Module Type 12AA.
Analyzer with hardware and software
for simulating:
a signal generator capable of gen-
erating the required test signals
an audio frequency analyser capa-
ble of ⅓-octave band analyses
Loudspeaker
To analyzer
Power amplifier
Ear muffs under test
Power Module
Type 12AK
From
preamplifier
Test Fixture Type 45CA
G.R.A.S.
Power Module
Type 12AK
Gain
+20
+10
+30
+40
+50
0
HP
Dir
Lin
AW
Filter
Overload
Inst.
Latch
SysCh.
Adjust
Power
On
Ovl.
Reset
Low
Batt.
Signature Series
Output
Input
080012
G.R.A.S.
ISO 4869-3 Hearing-protector Test Fixture
Type 45CA
Serial No. XXXXX
G.R.A.S. SOUND & VIBRATION
Page 15
Hearing-Protector Test Fixture Type 45CA
080001
