Introduction
Overview
The 45CC Headphone Test Fixture is for testing of headphones and headsets. With a focus on
accurate and reproducible test results, the test fixture can easily be adapted to many different
headphone/headset designs and sizes.
•
Adjustable head dimensions:
– Distance between ears adjustable from 130 to 170 mm
– Headband Holder height adjustable from 75 to 135 mm
• Reproducible positioning of Device Under Test with 45CC’s unique Positioning Guides. All ad
-
justments can be done in seconds.
•
The microphones can easily be dismounted for calibration.
All adjustments to headband position and height as well as distance between ear plates can be
done quickly and very accurately. Precise scales make it easy to document all settings: headband
position, width between ears, position of positioning guide. This also makes it easy to set up other
45CCs to mirror the original setup.
Once the test fixture has been adjusted to fit a certain headphone, the design of headband holder,
ear plates and the unique positioning system ensures that when testing identical headphones
you will get the same positioning and fit from one test to the next.
About This Manual
This manual consists of the following main sections:
•
The
45CC Configurations
details the 8 pre-configurations that GRAS has made available. The
contents of these configurations are listed in detail in the following section,
Delivered Items
.
•
Delivered Items
lists the items that are delivered with each configuration. This section can
be used as a reference to check your delivery and help you identify items mentioned in this
manual.
•
General Description
explains how the 45CC is designed and what adjustments are available.
•
The section
Assembly and Adjustments
explains
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-
cific information about how to calibrate, refer to the documentation for your calibration equip
-
ment.
• For people eager to get started, the one-page
Quick Assembly Guide
on page
4 should
be a help.
Instruction Manual
GRAS 45CC Headphone Test Fixture | 5
