: equivalent standard leak rate
: internal volume of the device package cavity
: atmospheric pressure (1 atm)
: pressure of exposure absolute
: time of exposure to Pₑ
: dwell time between release of pressure and leak detection
Tracer gas in sealing atmosphere
Partial pressure of helium at bombing end = 0.576 psi
Partial pressure of helium after dwell = 0.570 psi
: measured leak rate of helium = 1.04e-7

Reverse Calculations

If the Partial Pressure of helium forced in is psi then L = 0 atm·cc/s of air and R1 = 0 atm·cc/s of helium
If R is measured at atm·cc/s of helium then L = 0 atm·cc/s of air
Package/Sealing CharacteristicsPackageCavityVolume : 1 ccPartial Pressure : 0.000 psi absEquivalent Standard Leak Rate (L) 1e-6 atm·cc/s airEnvironmentPartial Pressure air = 1 atm absheliumBombing StartPackageCavityVolume : 1 ccheliumPartial Pressure : 0.000 psi absEnvironmentLeak rate : 5.49e-6 atm·cc/s heliumPartial Pressure helium = 30.000 psi absBombing End after 2.000 hourDwell Time StartCavityheliumPartial Pressure : 0.576 psi absPartial Pressure helium = 0 psi absR1 (t2=0) : 1.05e-7 atm·cc/s heliumMax Dwell Time of 1.000 hourCavityheliumPartial Pressure 0.570 psi absPartial Pressure helium = 0 psi absLoss of helium : 0.96 %R1 = 1.04e-7 atm·cc/s helium
DISCLAIMER : Please contact Oneida Research Services, Inc. at (315) 736-5480 or Daniel Rossiter by email at djrossiter@orslabs.com for technical discussions regarding the application of the Howl-Mann equation.
10-FEB-2021 v4.0