G.R.A.S. 45CC User manual

Instruction Manual
GRAS 45CC Headphone Test Fixture
45CC-1 to 45CC-12
LI0194 - 6 February 2018

Revision History
Any feedback or questions about this document are welcome at [email protected].
Revision Date Description
1 23 June 2016 Preliminary release
2 16 September 2016 First publication
3 06 February 2018 
added. Microphone assembly part numbers updated (p. 7-14)


www.gras.dk



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................................................................................................................................................. 
 ............................................................................................................................
Delivered Items..............................................................................................................................................
........................................................................................... 
 ........................................................................................................ 
.................................
 ...............................................
.................................................
 ..............................................................
 .................................
...........................................
........................................................................................
...................................................................................................
 ...............................................
.............................................................
General Description................................................................................................................................... 
..............................................................................................................................................................
................................................................................................................................................................
 ...............................................................................................................................................................
...........................................................................................................................................
...........................................................................................................
The Microphone Holder ......................................................................................................................................
.........................................................................................................................................
Assembly and Adjustments ..................................................................................................................... 
.........................................................................................................................................
.................................................................................................................
 ........................................................................................................................
.........................................................................................................
....................................................................................................................
 ....................................................................................................................
Calibration ................................................................................................................................................... 
........................................................................................................................... 
Warranty, Service and Repair................................................................................................................... 
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
Rod
Slot
12mm
Back
Front
Guide
pin
0+10
-10 5 5
A
0+15
-15
0+15
-15
4 mm Allen Key
Fig. 1. 
Instruction Manual4 | GRAS 45CC Headphone Test Fixture

Introduction
Overview



 Adjustable head dimensions:
 
 
 -
justments can be done in seconds.
 The microphones can easily be dismounted for calibration.







About This Manual

 The 45CC Configurations
Delivered Items.
• Delivered Items
be used as a reference to check your delivery and help you identify items mentioned in this
manual.
• General Description 
 The section Assembly and Adjustments  the assembly and adjustment procedures
necessary to prepare the 45CC for use.
 The section about Calibration shows how to dismantle a microphone for calibration. For spe-
-
ment.
 Quick Assembly Guide4 should
be a help.
Instruction Manual GRAS 45CC Headphone Test Fixture | 5



These are:




-




-



-
tory.





-
sembled and tested from the factory.



-
-



-
sembled and tested from the factory.
Instruction Manual6 | GRAS 45CC Headphone Test Fixture





-






-
sembled and tested from the factory.
Instruction Manual GRAS 45CC Headphone Test Fixture | 7

Delivered Items

to verify your delivery and to identify parts that are mentioned in this manual.

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
 
1/4" Preamplifier with 3 m integrated cable 
 
GR2013
GR1997
 

Instruction Manual8 | GRAS 45CC Headphone Test Fixture


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
 
1/2” CCP Standard Preamplifier with Mi-
crodot Connector, Very Short

GR2013
GR1997
 

Instruction Manual GRAS 45CC Headphone Test Fixture | 9

45CC-3 
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
 
1/4" Preamplifier with 3 m integrated cable 
 
GR2013
GR1997
 

Instruction Manual1 0 | GRAS 45CC Headphone Test Fixture


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
 
1/2” CCP Standard Preamplifier with Mi-
crodot Connector, Very Short

GR2013
GR1997
 

Instruction Manual GRAS 45CC Headphone Test Fixture | 1 1


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
 
 

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
 
1/4" Preamplifier with 3 m integrated cable 
 
GR2013
GR1997
 

Instruction Manual1 2 | GRAS 45CC Headphone Test Fixture


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
 
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
 
 
The 69CC-2 Microphone Assembly
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
 
1/2” CCP Standard Preamplifier with Mi-
crodot Connector, Very Short

GR2013
GR1997
 

Instruction Manual GRAS 45CC Headphone Test Fixture | 1 3

45CC-7 
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
 
 

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
 
1/4" Preamplifier with 3 m integrated cable 
 
GR2013
GR1997
 

Instruction Manual1 4 | GRAS 45CC Headphone Test Fixture


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
 
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
 
1/2” CCP Standard Preamplifier with Mi-
crodot Connector, Very Short

GR2013
GR1997
 

Instruction Manual GRAS 45CC Headphone Test Fixture | 1 5


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 6 | GRAS 45CC Headphone Test Fixture


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
 
1/4” CCP Standard Preamplifier Very Short 
 

Instruction Manual GRAS 45CC Headphone Test Fixture | 1 7


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
 
 
 
The 69CC-3 Microphone Assembly
 
 
 
*The parts are glued together and must not be disassembled
Instruction Manual1 8 | GRAS 45CC Headphone Test Fixture


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
 
MicroDot Stik
LEMO to LEMO BNC to BNC Power Supply
 
 
 
The 69CC-4 Microphone Assembly
 
1/4” CCP Standard Preamplifier Very Short 
 
*The parts are glued together and must not be disassembled
Instruction Manual GRAS 45CC Headphone Test Fixture | 1 9

General Description
-

Front View
Headband
Holder


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

Headband holder
Neck
Fig. 1. 
Instruction Manual2 0 | GRAS 45CC Headphone Test Fixture