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 [e-mail].
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 ......................................................................................................................................
.........................................................................................................................................
Assembly and Adjustments ..................................................................................................................... 
.........................................................................................................................................
.................................................................................................................
...........................................................................
........................................................................................................
.........................................................................................................
....................................................................................................................
 ....................................................................................................................
 ..................................................................................................................... 
..................................................................................................................................
 ...................................................................................................................................................
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 Guide4 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