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MODEL 426B02 In-line “A-weighting” Filter For Acoustic Measurements Utilizing “Prepolarized” Microphones and ICP® Microphone Preamplifiers Meets ANSI S1.4 (R2001) and IEC60651 (2001-10) Type 1 Sound Level Meter Standards for A-weighting filter Installs Between ICP® Microphone Preamplifier and ICP® Sensor Signal Conditioner Connects with Low-cost Coaxial Cable Supports Use of TEDS-capable ICP® Microphone Preamplifiers Provides Cost-effective “A-weighting” Solution Model 426B02 In-line Filter is used in conjunction with an ICP® preamplifier to provide A-weighting for acoustic measurements. The filter can be used with PCB® microphone preamplifier Models 426B03 and 426D01. The filter and preamplifier are powered by low-cost, constant current (420 mA) excitation commonly used with ICP® sensors. The in-line filter is inserted between the preamplifier and the constant current source. Since the system is low impedance, low-cost cables can be used, greatly reducing overall signal conditioning costs. Model 426B02 In-line “A-weighting” Filter Designed for stability over a wide range of environmental conditions, the filter's frequency response is weighted according to the A-weighting filter portion of both ANSI S1.4 and IEC 60651 Type 1 Sound Level Meter Standards; however, the tolerances are tighter than the Type 1 tolerance in these standards. The tighter tolerances permit the filter to be added to the system without compromising the Type 1 standards for the system. The filter supports "Smart Transducer Interface" IEEE P1451.4 with TEDS (Transducer Electronic Data Sheet) by passing TEDS data from the preamplifier through the filter. As with all PCB® instrumentation, this equipment is complemented with toll-free applications assistance, 24-hour customer service, and is backed by a no-risk policy that guarantees satisfaction or your money refunded. Total Customer Satisfaction Guaranteed MODEL 426B02 IN-LINE “A-WEIGHTING” FILTER Specifications Related Equipment Model 426B02 Performance English Frequency Response (A-weighted) (± 0.5 dB) [1] (± 1.0 dB) [1] SI 50 to 8000 Hz 20 to 20,000 Hz Gain (at 1 kHz) Output Voltage (Max) (< -50 dB THD, 1 kHz) 0.0 ± 0.3 dB 3.5 V pk Output (Max) (with 50 mV/Pa microphone) (with 12.5 mV/Pa microphone) 131 dB 143 dB Environmental Temperature Sensitivity (-40 to +149 °F (-40 to +65 °C)) Maximum Temperature (Operating) Humidity Sensitivity (0 to 95% RH, non-condensing) [2] ± 0.5 dB 176 °F 80 °C ± 0.5 dB Model 482C 1, 4, or 8-channel, multi-purpose ICP® sensor signal conditioner with AC, DC or battery power Model 480M122 Single-channel, battery powered ICP® sensor signal conditioner with 4 mA, 28 VDC excitation Model 426D01 ICP® preamplifier for 1/2-inch Prepolarized Microphones Model 426B03 ICP® preamplifier for 1/4-inch Prepolarized Microphones Electrical Electrical Noise (Flat, 20 to 20k Hz) (1/3 octave band @ 1k Hz) Input Impedance Output Impedance Excitation Voltage Constant Current Excitation Current Output (delivered to preamplifier) (± 0.15 mA) [3] Cable Driving Capability (100 ft (30.4 m) cable length) [3] [4] < 25.0 µV < 2.8 µV 30 kohm 50 ohm 24 to 32 VDC 4-20 mA 0.75 mA 3.5 V pk, to 30.3 kHz Physical Electrical Connector (input) (output) BNC Plug BNC Jack Size (diameter x length) 0.57 x 3.66 in 14.5 x 93 mm Notes: [1] re 1 kHz [2] at +104 °F (+40 °C) [3] for best performance, filter should be installed next to the preamplifier [4] with 4 mA excitation and 300 pF total cable capacitance Series 003B Coaxial Cable 10-32 Plug to BNC Jack Series 003D Coaxial Cable BNC Plug to BNC Plug ISO 9001:2000 CERTIFIED A2LA ACCREDITED to ISO 17025 © 2007 PCB Group, Inc. In the interest of constant product improvement, specifications are subject to change without notice. PCB, ICP, and Modally Tuned are registered trademarks of PCB Group, Inc. SensorLine is a service mark of PCB Group, Inc. All other trademarks are properties of their respective owners. VIB-426B02-1207 Model 377A11 1/2-inch prepolarized Pressure Microphone Model 377A20 1/2-inch prepolarized Random Incidence Microphone Model 377A10 1/4-inch prepolarized Pressure Microphone Model 377A01 1/4-inch prepolarized Free-field Microphone PCB® Piezotronics, Inc. specializes in the development, application, and support of shock and vibration sensors, microphones, impact hammers, piezoelectric actuators, and dynamic strain sensors for acceleration measurements, acoustic testing, and structural testing requirements. This product focus, coupled with the strengths and resources of PCB, permits us to offer exceptional customer service, 24-hour technical assistance, and a Total Customer Satisfaction guarantee. 3425 Walden Avenue, Depew, NY 14043-2495 USA Toll free 888-684-0013 24-hour SensorLineSM 716-684-0001 Fax 716-685-3886 E-mail acoustics@pcb.com Web site www.pcb.com AS9100:2004 CERTIFIED Model 377A02 1/2-inch prepolarized Free-field Microphone Printed in U.S.A. Visit www.pcb.com to locate your nearest sales office