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Quick Guide
GRAS 40PM
EQset™ Miniature Production Line Microphone
1. EQset™
EQset is a technology that removes the unnecessary
production line stoppages for calibration and provides
consistent, valid data, drastically reducing the chances
of false failures or false passes. And calibration is only
needed to verify functionality and to validate the entire
measurement chain because EQset microphone essen-
tially equalizes the signal before it reaches the analyzer.
1.1 No need for TEDS
EQset ensures a flat response curve and uniform sen-
sitivity for each microphone. The consistency between
microphones enables data traceability without the need
to track where each microphone is placed, so there is
no need to identify individual microphones and make
corrections based on their individual sensitivities and
response curves.
2. 40PM
40PM microphones with EQset are designed for use in
production line environments. Designed to be cost-ef-
fective, easy to use, resistant to error, and environmen-
tally stable, .
The tolerance for individual microphone sensitivities is
less than ±0.2 dB, and frequency-response variation is
less than ±0.5 dB up to 10 kHz. And because 40PM is
dimensionally identical to the traditional production line
microphones, you can easily replace them in existing
setups.
3. Setup and use with APx517B
analyzer
Setting up and measuring with 40PM microphones is
very simple:
1. Place the microphone at the test station as required by the
measurement standards.
2. Connect the cable to the microphone,
3. Set the sensitivity in the APx500 software (see figure):
A. Go to Signal Path Setup panel > Input Configuration >
Input 1 tab.
B. Set the Measure control to Acoustic.
C. Set the Sensitivity to 25.00 mV/Pa for the channel used
with the microphone (in this case, Channel 1).
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Summary of Contents for Axiometrix Solutions GRAS 40PM
- Page 1 Quick Guide GRAS 40PM EQset™ Miniature Production Line Microphone 1. EQset™ 3. Set the sensitivity in the APx500 software (see figure): A. Go to Signal Path Setup panel > Input Configuration > EQset is a technology that removes the unnecessary Input 1 tab. production line stoppages for calibration and provides B. Set the Measure control to Acoustic. consistent, valid data, drastically reducing the chances C. Set the Sensitivity to 25.00 mV/Pa for the channel used with the microphone (in this case, Channel 1). of false failures or false passes. And calibration is only needed to verify functionality and to validate the entire measurement chain because EQset microphone essen- tially equalizes the signal before it reaches the analyzer. 1.1 No need for TEDS EQset ensures a flat response curve and uniform sen- sitivity for each microphone. The consistency between microphones enables data traceability without the need to track where each microphone is placed, so there is no need to identify individual microphones and make corrections based on their individual sensitivities and response curves. 2. 40PM 40PM microphones with EQset are designed for use in production line environments. Designed to be cost-ef- fective, easy to use, resistant to error, and environmen- tally stable, .
- Page 2 Quick Guide / GRAS 40PM 4. Set the Acoustic Output Level of the power amplifier: 4. Key specifications NOTE: Before setting the acoustic output level, the Sensitivity (±0.2 dB; @ 250 Hz) 25 mV/Pa microphone must be connected and setup as in Step 3. Dynamic range 30 dB(A) - 120 dB Frequency range 20 Hz to 20 kHz A. Check the Acoustic checkbox in Signal Path Setup panel > Output Configuration (see Signal Path Setup Flat frequency response variance ±0.5 dB figure, above). Environmental stability variance (*) ±0.3 dB B. Click the Acoustic Output Level button to open the Set Acoustic Output Level dialog (figure below). See the APx500 documentation for information on regu- lating the generator level for acoustic measurements. 5. Measure according to your standard processes. *Typical environmental conditions on a production line are defined by temperature varying between 13 and 35°C (55 to 95°F), static pressure varying between 983 and 1043 hPa, and non-condensing humidity.
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