GRAS 45CC Series User manual
Instruction Manual
GRAS 45CC Headphone Test Fixture
45CC-1 to -4, -9, -10 and -14 to -17
LI0194 – 2 March 2018
Revision History
Any feedback or questions about this document are welcome at gras@grasacoustics.com.
Revision Date Description
1 23 June 2016 Preliminary release
2 16 September 2016 First publication
3 2 March 2018
added. Microphone assembly part numbers updated (p. 7-14)
4 3 March 2022
522 April 2022
www.GRASacoustics.com
not liable or responsible for any errors or inaccuracies that may appear in this document.
Trademarks
-
Instruction Manual2 | GRAS 45CC Headphone Test Fixture
Contents
Quick Assembly Guide..................................................................................................................................
Introduction ...................................................................................................................................................
Overview ..................................................................................................................................................................
About This Manual.................................................................................................................................................
............................................................................................................................
......................................................................................................................................................
″Microphones ...............................................................................................
″Microphones ............................................................................................................
″Microphones .............................
″Microphones ............................................
″Microphones ............................................................................................
″Microphones .......................................................................................................
............
...
......
.....
General Description...................................................................................................................................
..............................................................................................................................................................
................................................................................................................................................................
...............................................................................................................................................................
...........................................................................................................................................
...........................................................................................................
The Microphone Holder ......................................................................................................................................
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Assembly and Adjustments .....................................................................................................................
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Correction Factors ..............................................................................................................................................
Level Calibration with a Pistonphone.............................................................................................................
Level Calibration with a Sound Calibrator ....................................................................................................
...........................................................................................................................
Warranty, Service and Repair...................................................................................................................
Calibration .............................................................................................................................................................
Warranty.................................................................................................................................................................
Service and Repairs ............................................................................................................................................
Instruction Manual GRAS 45CC Headphone Test Fixture | 3
Quick Assembly Guide
-
1. Slide the ear plate assembly’s Rods into the Slots on the 45CC.
2.
Ear Plate Assembly
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
4 mm Allen Key
Fig. 1.
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
Slot
Rod
Instruction Manual4 | GRAS 45CC Headphone Test Fixture
Introduction
Overview
• Adjustable head dimensions:
•
adjustments can be done in seconds.
•
About This Manual
• Quick Assembly Guide4 provides very basic assembly help.
• 45CC Configurations-
Delivered Items.
• Delivered Items
used as a reference to check your delivery and help identify items mentioned in this manual.
• General Description
• Assembly and Adjustments the assembly and adjustment procedures necessary to
prepare the 45CC for use.
• Calibration
Instruction Manual GRAS 45CC Headphone Test Fixture | 5
assembled and tested from the factory.
″Microphones
″Microphones
″Microphones
″
″Microphones
″Microphones
″-
-
possible.
″Microphones
″Microphones
″Microphones
″
Instruction Manual6 | GRAS 45CC Headphone Test Fixture
Microphones
Microphones
-
phones
-
-
Microphones
Microphones
-
phones
-
-
Instruction Manual GRAS 45CC Headphone Test Fixture | 7
Delivered Items
to verify your delivery and to identify parts that are mentioned in this manual.
″Microphones
Included Items
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
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
¼" Preamplifier with 3 m integrated cable
GR2013
GR1997
Instruction Manual8 | GRAS 45CC Headphone Test Fixture
″Microphones
Included Items
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
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
½″CCP Standard Preamplifier with Micro-
dot Connector, Very Short
GR2013
GR1997
Instruction Manual GRAS 45CC Headphone Test Fixture | 9
″Microphones
Included Items
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
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
¼" Preamplifier with 3 m integrated cable
GR2013
GR1997
Instruction Manual1 0 | GRAS 45CC Headphone Test Fixture
″Microphones
Included Items
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
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
½″CCP Standard Preamplifier with Micro-
dot Connector, Very Short
GR2013
GR1997
Instruction Manual GRAS 45CC Headphone Test Fixture | 1 1
″Microphones
Included Items
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
The 69CC-3 Microphone Assembly
Microphone Holder
Instruction Manual1 2 | GRAS 45CC Headphone Test Fixture
″Microphones
Included Items
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
The 69CC-4 Microphone Assembly
¼″CCP Standard Preamplifier Very Short
Instruction Manual GRAS 45CC Headphone Test Fixture | 1 3
Microphones
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
Pinna Holder Plate
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
¼" Preamplifier with TEDS
Right-angled adjustable adapter for mic/
¼” preamp.
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
Instruction Manual1 4 | GRAS 45CC Headphone 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
Pinna Holder Plate
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
¼" Preamplifier with TEDS and 3 m inte-
grated cable
Right-angled adjustable adapter for mic/
¼” preamp.
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
Instruction Manual GRAS 45CC Headphone Test Fixture | 1 5
Microphones
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
Pinna Holder Plate
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
¼" Preamplifier with TEDS
Right-angled adjustable adapter for mic/
¼” preamp.
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
Instruction Manual1 6 | GRAS 45CC Headphone 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
Pinna Holder Plate
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
¼" Preamplifier with TEDS and 3 m inte-
grated cable
Right-angled adjustable adapter for mic/
¼” preamp.
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
Instruction Manual GRAS 45CC Headphone Test Fixture | 1 7
Optional Mouth Simulators
-
Included Items
Instruction Manual1 8 | GRAS 45CC Headphone Test Fixture
General Description
-
Neck superimposed on a continuous adjustment
The distance between the
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
4 mm Allen Key
20
10
0
150130 170
150170 130
adjustment - 20 mm
four positions 10 mm apart
Width adjustment
130 to 170 mm
Neck
Fig. 1.
Instruction Manual GRAS 45CC Headphone Test Fixture | 1 9
is shown. The Headband
Holder can be adjusted relative to the Ear Plates
The -
A
B
C
D
1020304050
1020304050
Min: 75 mm
Neck
Mouth Simulator
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
4 mm Allen
Key
Fig. 2.
Instruction Manual2 0 | GRAS 45CC Headphone Test Fixture
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