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PCB Piezotronics, Model 426A11
is a 1/2” preamplifier that operates from ICP ®Sensor Power. The preamplifier allows the user to select 0 or +20 dB of gain and either
a 20 Hz (-3dB) High Pass Filter or A-Weighted filter output response, in lieu of flat unfiltered response, via two switches, located on
the external diameter. An overload detector senses both polarity overload signals in front of the filters. The unit comes standard with
TEDS and is programmable upon request.
Model 426A11 preamplifier includes both A-weight and selectable “High Pass” filter, for automotive or aerospace cabin testing
requirements. The “A-weight” filter attenuates signals less responsive to the human ear, normally below 1 kHz and above 4 kHz. This
filter represents how the human ear perceives that sound. To make the cabin less noisy, a random incidence microphone (such as PCB®
Model 377B20), designed to measure sound from different angles of incidence, along with A-weight filter, is the choice of test equipment.
When an “in-cabin” automotive test is performed, some manufacturers will sometimes dangle a microphone and preamplifier inside
the car’s cockpit. Any movement will cause the microphone to sway, generating low frequencies that are not the target of the test and
adversely affecting results. The “High Pass” filter eliminates low frequencies, which are not of interest, consuming the dynamic range and
overloading output signals. This filter, along with the low noise rating of the microphone and preamplifier combination, helps ensure
minimal Noise Floor. The 426A11 has a guaranteed electrical noise rating of 5.6 µV (3.7 µV typical) at the output, while set on 0 dB gain
and with high Pass filter selected.
The 426A11 is designed to work in a wide range of temperatures (-20oC to +70oC), which makes it an excellent choice
for “Under Hood” automotive noise source identification, or brake noise tests, where higher operating temperatures may be
required. The product can also be used in standard automotive “Pass By” Tests, which is conducted to minimize the noise outside
the vehicle, while in operation.
The 426A11 is offered with PCB®'s Total Customer Satisfaction policy. If for any reason, at any time, you are not satisfied with our
product, you can return it for an exchange or refund.
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