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Summary of Contents for GRAS 48LA
- Page 1 Instruction Manual GRAS 48LA and 48LX-1 UTP Microphones Mounting and In-Situ Verification...
- Page 2 Any technical documentation that is made available by GRAS is the copyrighted work of GRAS and is owned by GRAS. The content in this document is subject to change without notice. GRAS Sound & Vibration is not liable or responsible for any errors or inaccuracies that may appear in this document.
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Page 3: Table Of Contents
Sensitivity Calibration with 42AG Multifunction Sound Calibrator ......... 10 Ordering Information .....................11 Verification Items ..........................11 Mounting Accessories .........................11 Warranty, Service and Repair..................12 Warranty, Service and Repairs ......................12 Instruction Manual 48LA and 48LX-1 – Mounting and in-situ verification | 3... -
Page 4: Introduction
Mounting Mounting the 48LA and 48LX-1 microphones is fairly straightforward. Four mounting methods are described here. The top-mounted tape can easily be cut to different shapes if needed. Mounting with Hard Fairing This mounting method can be used on plain structures. -
Page 5: Mounting With Hard Fairing
Mounting with Hard Fairing The fairing for 48LA and 48LX-1 is made from hard plastic. It has a recess for holding the micro- phone. Once mounted, the fairing can be used as a dock in which the microphone can be inserted and removed without affecting the measurement position which can be retained for future use. -
Page 6: Mounting With Soft Fairing
Cable attached Topside to the tape Flip Sticky side Test structure Flip Fig. 4. Showing how to mount 48LA/LX-1 and the soft fairing onto a test structure. Flip Instruction Manual 48LA and 48LX-1 – Mounting and in-situ verification | 6 Flip... -
Page 7: Mounting Without Fairing
DB0521 Mounting Overlay Tape Test structure Microphone mounted using the method shown in Fig 2. Fig. 6. Optional top-mounted tape for smoothened mounting of fairing and cable. Instruction Manual 48LA and 48LX-1 – Mounting and in-situ verification | 7... -
Page 8: Verification
The adapter has three main features. • It has a 1" stud/collar for fit with any GRAS calibrator fitted for use with an 1" adapter. • It has a soft cushion similar to those found on circum-aural headphones. It creates a closed cavity over the microphone to be calibrated. -
Page 9: Procedure
Procedure Important. Before verification, you must ensure that the microphones to be verified are properly connected. A 48LA/48LX-1 needs a warm-up period of about 3 minutes to obtain stable sensitivity. G.R.A.S. 42AG G.R.A.S. 42AG Fig. 8. In-situ verification using 42AG and RA4800. -
Page 10: Sensitivity Calibration With 42Ag Multifunction Sound Calibrator
Neck for pistonphone with ½"collar Fig. 9. Mounting a UTP microphone in the RA4801 Adapter for sensitivity calibration of 48LA/48LX-1. 1. Insert the neck into the 42AG's collar and tighten the collar. 2. Place the 42AG upright on a table. -
Page 11: Ordering Information
Soft Fairing Mounting Kit for UTP Microphone Sets, 10 pcs. RA4812 Mounting Overlay Tape for UTP Fairings RA4812-2 Mounting Overlay Tape for UTP Fairings , 10 pcs. MI0031 Cleaning Tissue Instruction Manual 48LA and 48LX-1 – Mounting and in-situ verification | 11... -
Page 12: Warranty, Service And Repair
Warranty, Service and Repair Warranty, Service and Repairs GRAS products are made of components from our proven standard portfolio and are all manu- factured of high-quality material and branded parts that were chosen and processed to ensure life-long stability and robustness.
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