Related Manuals for G.R.A.S. 42AG
Summary of Contents for G.R.A.S. 42AG
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Page 1: Instruction Manual
Instruction Manual G.R.A.S. 42AG Multifunction Sound Calibrator www.gras.dk LI0196 – 19 July 2017... - Page 2 Revision History Any feedback or questions about this document are welcome at gras@gras.dk. Revision Date Description 23 May 2017 First edition 19 July 2017 Caution about the speaker diaphragm added Copyright Notice © 2017 G.R.A.S. Sound & Vibration A/S http://www.gras.dk Any technical documentation that is made available by G.R.A.S.
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Page 3: Table Of Contents
Background Noise ..................9 Corrections ....................9 Maintenance and Calibration ............11 Replacing Batteries .................. 11 Calibrating the 42AG Sound Calibrator ............11 Adjusting the 42AG's Levels ..............11 Delivered Items ................13 Technical Specifications ..............13 Warranty, Service and Repair ............14... -
Page 4: Introduction
. See "Description" on page 6. Introduction This section outlines how the 42AG works. Also, the user interface, the battery compartment and the location of the calibration button are described. Using the 42AG This section describes how 42AG is operated and discusses the factors that must be considered to achieve a correct calibration result. -
Page 5: Principles Of Operation
Coup l er changes to the load volume. 42AG can produce a sinusoidal signal of 250 Hz or 1 kHz at 94 dB or 114 dB. The environmen- A m pl i f ie r S in u s ge n erat or tal conditions: air pressure, temperature and humidity can be displayed. -
Page 6: Description
Display. Displays the actual values for calibration and ambient conditions. Battery compartment Calibration button (sealed) Fig. 3. Battery compartment and Calibration button. Battery Compartment. Holds two LR03/AAA batteries. The Calibration Button. This button is used when 42AG must be calibrated. LI0196 – 19 July 2017... -
Page 7: Using The 42Ag
Microphone Calibration Adapter Selection From the factory, the 42AG has a 1” calibration coupler mounted with an adapter for the 1/2” microphone typically used with Sound Level Meters. If you are going to calibrate a 1” microphone, remove the 1/2” adapter. For 1/4” and 1/8”... - Page 8 G.R.A.S. 26AG 1/2'' Insert Voltage Preamplifier with Integrated Connector, should be used. Such measurements can be performed using 42AG, but would normally be considered outside the intended use for an instrument primarily designed for field use.
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Page 9: Calibration Considerations
Calibration Considerations Accuracy 42AG is a precision instrument with an accuracy better than ±0.2 dB. Calibration of the sound calibrator at regular intervals will ensure that drift does not occur and that it performs within specifications. If an accuracy better than ±0.2 dB is desired, we recommend using a G.R.A.S. 42AP Intelligent Pistonphone, Class 0 where an accuracy better than 0.09 dB can be obtained. - Page 10 Weighting Network The stated levels for calibrator 42AG are all unweighted levels for the two calibration frequencies, 250 Hz and 1 kHz. All sound level meters shall display at least the A-weighted sound pressure level. The A-weighting is a standardized, frequency dependent weighting which originally was developed to mimic our auditory organ and is specified in the standards for a sound level meter.
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Page 11: Maintenance And Calibration
Maintenance and Calibration Replacing Batteries 42AG uses two 1.5 V AAA size cells. Remove the batteries as soon as they are discharged or if the 42AG is stored for a prolonged period of time. Leakage from the batteries may otherwise destroy the electronic components. - Page 12 7. While the display is flashing, press to increase the reading or to reduce the reading. 8. When the correct value for humidity is displayed, press to terminate calibration of the 42AG and return to normal operation mode. LI0196 – 19 July 2017...
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Page 13: Delivered Items
Delivered Items 42AG Sound Calibrator 42AG 1/2” Adapter RA0297 1/4” Adapter RA0049 1/8” Adapter RA0069 LR6-AA alkaline cells EL0001 Technical Specifications 42AG Standards IEC 60942 (2003) ANSI/ASA S1.40 (2006) Frequency 250 Hz (251.19 ±0.30) 1000 Hz (± 1 Hz) Level 94 dB ±0.2 dB... -
Page 14: Warranty, Service And Repair
Warranty, Service and Repair Calibration Before leaving the factory, all G.R.A.S. products are calibrated in a controlled laboratory environ- ment using traceable calibration equipment. We recommend a yearly recalibration, depending on the use, measurement environment, and internal quality control programs. We recommend calibration prior to each use to ensure the accuracy of your measurements.