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RUSKA 7750i
Users Manual
Table A-2. Uncertainty Analysis for a RUSKA 7750i — 3 month and Yearly Calibration
Uncertainty Analysis —
A.1 Performance — (Linearity, Hysteresis,
Repeatability and Temperature)
A.2 Span Stability
A.3 Zero Stability — (re-zero at 8 hours)
A.4 Calibration Standard — (Abs. Mode)
(RUSKA 2465 or 2468 DWG)
A.5 Environmental —
Temperature (Included in A.1)
Head Pressure (± 0.25 in)
Control — (in Passive Control)
A.6 Vacuum Reference Zeroing Sensor
A.7 Two Sigma Expanded Uncertainty
Table A-3. Uncertainty Analysis for a RUSKA 7750i — 3 month and Yearly Calibration
Uncertainty Analysis —
A.1 Performance — (Linearity, Hysteresis,
Repeatability and Temperature)
A.2 Span Stability
A.3 Zero Stability — (re-zero at 8 hours)
A.4 Calibration Standard —
(RUSKA 2465 or 2468 DWG)
A.5 Environmental —
Temperature (Included in A.1)
Head Pressure (± 0.25 in)
A.6 Vacuum Reference Zeroing Sensor
A.7 Two Sigma Expanded Uncertainty
A-4
RUSKA 7750i
RUSKA 7750i
Control — (in Passive Control)
90 Day Uncertainty
40 inHg Ps Sensor
(2 sigma)
Greater of 0.005% of RDG
or 0.0005 inHg
0.0019% of RDG/90 days
0.0005 inHg
0.001% RDG & 0.00039 inHg
0.000% of RDG
0.0007% of RDG
0.000% of RDG
0.00039 inHg
RSS (0.0055% RDG &
0.0009 inHg)
90 Day Uncertainty
32 inHg Qc Sensor
(2 sigma)
Greater of 0.005% of RDG
or 0.0004 inHg
0.0019% of RDG/90 days
0.0004 inHg
Greater of 0.0010% RDG or 0.00002
inHg
0.000% of RDG
0.0007% of RDG
0.000% of RDG
0.000 inHg
RSS (0.0055% RDG &
0.0007 inHg)
1 year Uncertainty
40 inHg Ps Sensor
(2 sigma)
Greater of 0.005% of RDG
or 0.0005 inHg
0.0075% of RDG/year
0.0005 inHg
0.001% RDG & 0.00039 inHg
0.000% of RDG
0.0007% of RDG
0.000% of RDG
0.00039 inHg
RSS (0.0091% RDG &
0.0009 inHg)
1 year Uncertainty
32 inHg Qc Sensor
(2 sigma)
Greater of 0.005% of RDG
or 0.0004 inHg
0.0075% of RDG/year
0.0004 inHg
Greater of 0.0010% RDG or
0.00002 inHg
0.000% of RDG
0.0007% of RDG
0.000% of RDG
0.000 inHg
RSS (0.0091% RDG & 0.0007
inHg)
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