Fluke PG9000 Series, Operation And Maintenance Manual

Page: 195 / 202

7. APPENDIX
Page 185 © 2011 Fluke Calibration
7.2.1 Calculations
PG9000 performs pressure-to-mass and mass-to-pressure calculations as follows:
•
Gauge mode:
ΗG
P ,
,P
m
a
G
P
A
π
Α
πΓ
ρ
ρ
Mg
P
+
+






−
=
θ
θ
2 1
( )( )
[ ]
( )
nom C P ,P
θ
P
λ α α θ
A A
+ + − + ⋅ ⋅ =
−
1 20 1 10
6
0 , 20
•
Absolute pressure by adding atmospheric pressure:
atm HA
,P
,P
m
a
A
P P
A
π
A
πΓ
ρ
ρ
Mg
P
+ +
+






−
=
θ
θ
2 1
( )( ) [ ] ( )
nom C P ,P
θ
P
λ α α θ
A A
+ + − + ⋅ ⋅ =
−
1 20 1 10
6
0 , 20
•
Absolute pressure with vacuum reference:
vac HA
,P
,P
A
P P
A
π
A
πΓ
Mg
P
+ +
+
=
θ
θ
2
( )( )
[ ]
( )
nom C P ,P
θ
P
λ α α θ
A A
+ + − + ⋅ ⋅ =
−
1 20 1 10
6
0 , 20
•
Differential pressure (differential mode):
offset RPM vac HA
,P
,P
D
P P P P
A
π
A
πΓ
Mg
P
− − + +
+
=
θ
θ
∆
2
( )( )
[ ]
( )
nom C P ,P
θ
P
λ α α θ
A A
+ + − + ⋅ ⋅ =
−
1 20 1 10
6
0 , 20