Item Description:
For sale is a brand new B&K 4947 pressure field microphone.
I acquired a few of these a while ago and now I’ve decided to sell them.
Item is brand new and have never been used. It comes with a DZ-9566 random incidence corrector to achieve a flat random-response for measurements in diffused sound field. Factory cal sheet is included.
USPS priority shipping to lower 48 states is $10.65 USD.
USPS International flat rate priority shipping with full insurance is $50 USD. International buyers need to check their customs regulation and may need to pay tariff in order to receive the package.
US post office does not provide certain countries for package insurance therefore please message me before you buy.
Item Description:
Pre-polarized ½-inchMicrophone Type 4947 is optimized for pressure-field measurements such as coupler measurements, close to hard reflective surfaces, in enclosures or cavities that are small compared to the wavelength.
For example, in connection with telephone and hearing aid testing. The microphone is pre-polarized, which enables connection to CCLD input conditioning. The microphone is capable of withstanding the IEC 68-2-32 1meter drop test.
USE SCENARIOS
- Coupler measurements
- Hearing aid testing
- Telephone testing
- Connect to CCLD input
- High-humidity environments
CALIBRATION
The sensitivity can be calibrated at 250 Hz by using Pistonphone Type 4228 with ½-inch Adaptor DP0776. The actuator response can be measured using Electrostatic Actuator UA0033.
The pressure-field response can be obtained by adding the relevant correction curve to the actuator response.
Specifications:
Capacitance 14pF
Diameter 1/2
Dyn. Range 17.5–160 dB
Freq. range 8– 10000 Hz
Inherent noise 17.5dB A
Lower limiting frequency-3dB 5Hz
Optimized Pressure Field
Polarization Pre-polarized
Polarization voltages 0V
Pressure coefficient -0.006dB/kPa
Sensitivity 12.5mV/Pa
Temperature coefficient 0.006dB/ºC
Temperature range -30– 125 ℃
Venting Rear
Sound field Pressure-field
Microphone type Pressure Field