GRAS 45CA-1 User manual

Instruction Manual
GRAS 45CA Headphone/Hearing-protector Test Fixture
LI0187 – 29 August 2019

Revision History
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Revision Date Description
1 16 February 2016 Manual for 45CA-1 to 45CA-6.
2 4 July 2017 

3 6 February 2018 
added
5 3 May 2019 Table with correction factors added.
6 


www.gras.dk




Trademarks
-

Instruction Manual2 | GRAS 45CA Headphone/Hearing-protector Test Fixture

Contents
Introduction ...................................................................................................................................................
About this Manual.................................................................................................................................................. 
............................................................................................................................................ 
Delivered Items..............................................................................................................................................
 ....................................................... 
................................. 
................................................... 
............................................. 
................................................ 
...........................................
..............................................
.............................................. 
.........................
..................................................
 ....................................
....................................................................
......................................................
Accessories ................................................................................................................................................. 
Typical Application Setups....................................................................................................................... 
Mounting the Pinnae ................................................................................................................................. 
......................................................................................................................
............................................................................................................
.............................................................................................................
Pressure Equalization ............................................................................................................................... 
 ..................................................................................................................... 
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
......................................................................................................................................................
Correction Factors ..............................................................................................................................................
........................................................................................................................... 
 .......................................................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
..............................................................................................................................................
 ........................................................................................................................................
......................................................................................................................................
Warranty, Service and Repair................................................................................................................... 
Calibration .............................................................................................................................................................
Warranty.................................................................................................................................................................
 ............................................................................................................................................
Instruction Manual 45CA Headphone/Hearing-protector Test Fixture | 3

Introduction
About this Manual




• 
• 
-




45CA-1 
45CA-2 
Testing of Headphones


45CA-3 
45CA-4 
Testing of Headphones, Earplugs, and Insert Earphones


45CA-5 
45CA-6 
45CA-7 
45CA-8 



45CA-9 
45CA-10 


45CA-11 
45CA-12 

Instruction Manual4 | GRAS 45CA Headphone/Hearing-protector Test Fixture

Delivered Items




Included Items

  
  
  
  
  
  
  
  
G.R.A.S.
ISO 4869-3 Hearing-protector Test Fixture
Type 45CA
Serial No. XXX XX
30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0


Insert

Instruction Manual 45CA Headphone/Hearing-protector Test Fixture | 5


-
-





Included Items
 
 
1/2” to 1/4” Adapter 
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
Instruction Manual6 | GRAS 45CA Headphone/Hearing-protector Test Fixture


-
-
-


calibrated and ready for use.

Included Items



 
1/2" to 1" Microphone Adapter 
 
 
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
Instruction Manual 45CA Headphone/Hearing-protector Test Fixture | 7





-



Included Items
 
-


1/2" to 1" Adapter for RA0039 
 
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
Instruction Manual8 | GRAS 45CA Headphone/Hearing-protector Test Fixture


-





Included Items
 
 
Adapter 
 
 
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
Instruction Manual 45CA Headphone/Hearing-protector Test Fixture | 9







Included Items
 

 
 

Simulator

 
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
Instruction Manual1 0 | GRAS 45CA Headphone/Hearing-protector Test Fixture


-




Included Items
 

 
 
 
 
 
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
Instruction Manual 45CA Headphone/Hearing-protector Test Fixture | 1 1


-





Included Items
 

30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD

Simulator

GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
 
 
 
Instruction Manual1 2 | GRAS 45CA Headphone/Hearing-protector Test Fixture


-




Included Items
 

30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
 
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
 
 
 
Instruction Manual 45CA Headphone/Hearing-protector Test Fixture | 1 3








Included Items
 

30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD

Simulator

GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
 
 
 
Instruction Manual1 4 | GRAS 45CA Headphone/Hearing-protector Test Fixture







Included Items
 

30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
 
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
 
 
 
Instruction Manual 45CA Headphone/Hearing-protector Test Fixture | 1 5


-





Included Items
 

30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
 
 
 
Instruction Manual1 6 | GRAS 45CA Headphone/Hearing-protector Test Fixture







Included Items
 

30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
30 40 45 55 60
3
30 40 45 55 60
53 05
5 5 0
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
 
GR0917
GR0924
GR1440B
RA0045
26AS
45EA
46BP
RA0241
40AG
GS0158
GR0010
46BD 1
2
43
5
L
B-2 B-1
02010
01020
J
GR1153
46BP-1
40AD
 
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
 
 
 
Instruction Manual 45CA Headphone/Hearing-protector Test Fixture | 1 7

Accessories
Pinnae


RA0172
 KB0070
 KB0071
 KB0072
 KB0073
 KB1070
 KB1071
 KB5010
 KB5011
Power Modules
 12AQ
 12AA
Calibration Equipment
 
 42AA
Multifunction Sound Calibrator 
 RA0023
 RA0287
 RA0157
Instruction Manual1 8 | GRAS 45CA Headphone/Hearing-protector Test Fixture

Typical Application Setups


G.R.A.S.
PowerModule
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


 

 
-octave band analyses




Module
From


080012
G.R.A.S.
ISO 4869-3 Hearing-protector Test Fixture
Type 45CA
Serial No. XXXXX
080001
Fig. 1. A typical measurements setup for testing of the insertion loss of ear mus.

-



 

 
-octave band analyses




Module

Simulators

080014
G.R.A.S.
ISO 4869-3 Hearing-protector Test Fixture
Type 45CA
Serial No. XXXXX
080001
G.R.A.S.
PowerModule
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
Fig. 2. A typical measurements setup for headphone testing. Here shown with externally polarized
microphones (45CA-4).
Instruction Manual 45CA Headphone/Hearing-protector Test Fixture | 1 9

-
-


080015


 


an audio frequency analyser
-octave band
analyses





Module
From RA0045


G.R.A.S.
PowerModule
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 conguration with externally polarized ear
simulators is shown.
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Instruction Manual2 0 | GRAS 45CA Headphone/Hearing-protector Test Fixture