- 5 -
Figure 5
Microphone calibration provides, with a definable degree of accuracy, the necessary link
between the physical quantity being measured and the electrical signal generated by the
microphone. In addition, other useful information concerning operational limits, physical
parameters, electrical characteristics or environmental influences may be determined. Under
normal conditions, microphones are very stable. However, the microphone may be temporarily
or permanently affected by harsh influences, such as moisture, dirt, being accidentally dropped
or other unusual conditions that may cause the microphone accuracy to deviate from the normal
specifications. This may manifest itself in a number of ways, ranging from a loss in frequency
range, to total failure of the built-in microelectronic circuit due to high mechanical shock.
~ Calibration Certificate ~
Model Number:
130E21
Serial Number:
37649
Description:
ICP® Microphone
Manufacturer:
PCB
Method
1
: Back-to-Back Reference
Calibration Data
Sensitivity:
48.1
mV/Pa
Reference Freq.:
250
Hz.
-26.4
dB re 1V/Pa
Output Bias:
8.6
VDC
Temperature:
71
°F
22
°C
Relative Humidity:
50
%
Condition of Unit
As Found: n/a
As Left:
New Unit, In Tolerance
Notes
1. This method involves comparing the test unit with a reference microphone in a GRAS 51AB calibrator.
2. Calibration is PTB Traceable and calibration records are on file.
3. Calibration is performed in compliance with ISO 9001, ISO 10012-1 and ANSI/NCSL Z540.3.
4. Due to state-of-the-art limitations, 4:1 calibration ratios are not possible on pressure measurement standards, microphones
and acoustic calibrators. Calibration ratios for these types of devices are limited to 1:1.
5. See M anufacturer’s Specification Sheet for a detailed listing of performance specifications.
6. This certificate shall not be reproduced, except in full, without written approval from PCB Piezotronics, Inc
7. Calibrated per ACS-21.
Technician:
Date:
V
Headquarters: 3425 Walden Avenue, Depew, NY 14043
Calibration performed at: 10869 Highway 903, Halifax, NC 27839
Page 1 of 1
T EL: 888-684-0013
FAX: 716-685-3886
www.pcb.com
CAL58-3465911589.795
October 29, 2013
Scott Skibniewski
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