GRAS 147EB User manual
Description
The 147EB microphone set for wheelhouse brake testing consists of a robust microphone set and three layers
of protection.
vibration, and a microphone capsule with a diaphragm which is a more robust type than that conventionally
-
ing is protected against water and the BNC connector is also watertight. A windscreen and two protection
Fig. 1. Three layers of protection: Windscreen on top of 1” protection grid on top of 1/2” protection grid. Both grids have built-in
acoustically transparent filters.
Delivered Items
Optional Items
Windscreen for 147EB. 1 pc.
Quick Guide
GRAS 147EB CCP X-Rugged Microphone
Maintenance
protect the diaphragm. This also means, of course, that over time they will become contaminated. The only way
to deal with this problem is visual inspection routines that take the driving conditions into account.
Apart from the obvious visual signs of contamination you should look for water in the windscreen. Especially in
cold weather near or below freezing temperatures, water may accumulate and freeze to ice in the windscreen.
Has this happened, the windscreen should probably be discarded.
diaphragm, therefore wet items must be dried between test sessions.
Recommended Inspection and service routines
ººF ººF
Wet roads, high humidity Wet roads, high humidity
Calibration intervals
Inspection intervals
Windscreen Check and clean* for dust Check and clean* for dust
Check and clean* for dust Check for contamination,
Check and clean* for dust Check for contamination,
Check and clean* for dust Check for contamination,
Check and clean* for dust Check for contamination,
*Cleaning: compressed air applied from the inside.
Calibration
result with the factory calibration.
Calibration Adapter.
Warranty and Service
The warranty does not cover damages to the protection grids caused by their intended use in the challenging
conditions in the wheelhouse.
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