Equation (reciprocal transducers)  

 Unit  

 Source Level  

 SL=10log(Pe) + 10log(ηea) + DI + 170.8  

 [dB re 1μPa @1m]  

 Transmit Response to Voltage  

 TRV=10log(GP) + 10log(ηea) + DI + 170.8  

 [dB re 1μPa/V @1m]  

 Transmit Response  to Current  

 TRC=20log(|Z|) + TRV  

 [dB re 1μ Pa/Amp @1m]  

 Receiving Response

 RR=TRC - 354 - 20log(fkHz)  

 [dB re 1V/μPa]  

 Conversions  

1Pa  =10⁶mPa=10^-5 bar=0.145×10^-3psi » 10^-5 atm

 1m=1.094yd=39.4inch  

 1kg=2.205lb  

 Unit to convert to  

Conversion Formula

 Y [°F]  

Y=1.8 ⋅ X + 32

 Y [W/m2]  

Y=0.667 ⋅ 10^-18 W/m² ⋅ 10^(X/10)

 Y [Pa] rms  

Y=(X⋅ 1000kg/m³ ⋅ 1500m/s)^1/2

 Y [Nepers]  

X=8.686 ⋅ Y

 T  

10¹²

+120

 G  

10⁹

+90

 M  

10⁶

+60

 k  

10³

+30

 h  

10²

+20

 da  

10¹

+10

 - 

10⁰

0

 d  

10^-1

-10

 c  

10^-2

-20

 m  

10^-3

-30

 μ  

10^-6

-60

 n  

10^-9

-90

 p  

10^-12

-120

-

 Square   meter  

-

-

-

-

or Kelvin

-

-

-

Electrical

Acoustical

1C/s

 1Ω^-1  

1J/s

1kg . m/s²

1N/m²