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■ 1/8 inch 6.5Hz to 140kHz external uneven polygical sound pressure sound field Micro hon Type 4138 microphones are designed for high sound pressure level measurement, very high frequency measurement, and measurement in a narrow space. It is an external polar polar microphone and is used in combination with a preamplifier. ■ Usage examples ・ Measurement of high -pitched pressure level and very high frequency ・ Measurements that require high space resolution and measurements in narrow places (model experiments, etc.) ■ About the use of the sound pressure sound field Microphone Sound pressure sound field microfones should be used for measurements in small, closed acoustic co -plas and near a hard reflective surface. The sound pressure sound field microfon is optimized to have a flat frequency response in the sound pressure sound field. Since the dimensions of the 4138 microphone are small, the impact on the frequency characteristics of the sound is small, and it can also be used for random incidence in the hearing frequency band. ■ Union -poles Since the 4138 type requires external biased voltage, it must be used in combination with a 2670-like preamplifier and 1/8 inch to 1/4 inch conversion adapter UA-0160. ■ Calibration The sensitivity of the 4138 type microphones can be calibrated at 250 Hz using a 4228-type piston phone and DP-0774 adapter, or can be calibrated at 1kHz using a 4231-type sound vapor proofreading or DP-0774 adapter. The sound pressure sound field response can be measured using the UA-0033 electrostatic actuator and the DB-0900 actuator adapter.
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4138Handling Company
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