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Summary of Contents for GRAS RA4803
- Page 1 Instruction Manual GRAS 48LX-4 and 48LX-8 UTP Line Arrays Level and Frequency Calibration...
- 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
Contents Introduction ........................4 RA4803 Sensitivity and Frequency Calibration Kit for 48LX-4 and 48LX-8 ..4 Adapter for Calibration of UTP Line Arrays ..................4 Pistonphone Calibration Adapter and Electrostatic Actuator ............4 Mounting the Line Array Calibration Adapter ............5 Frequency Calibration .....................8 Accessories ........................ -
Page 4: Introduction
Introduction Proper calibration of the line array requires that each microphone is calibrated separately in a controlled environment. For this purpose, the RA4803 calibration kit must be used. The contents of this kit are described below. RA4803 Sensitivity and Frequency Calibration Kit for 48LX-4 and 48LX-8... -
Page 5: Mounting The Line Array Calibration Adapter
Mounting the Line Array Calibration Adapter The calibration adapter for the line array consists of two parts held together with two finger screws. When assembled, but not fully tightened, the line array can be pushed into the slot, and can easily be moved and fixated over the microphone to be calibrated. When the finger screws are loosened about one full turn, the opening for the array is wide enough for this. - Page 6 Procedure 1. Ensure that the two finger screws are sufficiently loose for the strip to move smoothly in the slot. If the adapter is closed, about one full turn will suffice. 2. Push the strip into the slot until the diaphragm of the microphone to be calibrated is located in the center of the calibration opening.
- Page 7 4. Push the pistonphone down into the line array adapter. 5. Turn the pistonphone about 1/8 to 1/4 turn until the bayonet mechanism takes hold of the pistonphone. When this is done, the pistonphone will be kept upright by the grip exerted by the bayonet mechanism, and you are now ready to calibrate.
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Page 8: Frequency Calibration
Frequency Calibration For frequency calibration, a setup like the one shown in Fig. 6 is needed. We recommend a com- plete microphone calibration system like the GRAS 90CA Microphone Calibration System. G.R.A.S. Actuator Supply Type 14AA Power Calibration Microphone signal... -
Page 9: Accessories
Warranty, Service and Repair Warranty 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. The warranty does not cover products that are damaged due to negligent use, an incorrect power supply, or an incorrect connection to the equipment.
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