| Air Ultrasonic Ceramic Transducers | 400ET/R18S |
| Acoustic Performance |
| Impedance/Phase Angle vs. Frequency: Tested under 1Vrms Oscillation Level |
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| Sensitivity/Sound Pressure Level: Tested under 10Vrms @30cm |
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| Beam Angle: Tested at 40.0KHz |
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| Sensitivity Variation vs. Loaded Resistor - 400ER180 Receiver |
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| Center Frequency Shift vs. Loaded Resistor - 400ER180 Receiver |
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| SPL Variation vs. Driving Voltage - 400ET180 Transmitter |
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| Center Frequency Shift vs. Driving Voltage - 400ET180 Transmitter |
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