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RUSKA 7750i
Users Manual
Mode
1
Precision
Stability; Over 3 Months:
Over 1 Year:
Zeroing Vacuum Sensor
Active Control Stability
Control Low Limit
3
Zero Drift
Standard Load Volume
Total Uncertainty
(Aeronautical Units)
Total Uncertainty
(Engineering Units)
1
Precision is defined as the combined effect of linearity, repeatability, and hysteresis throughout the
operating temperature range. Some manufacturers use the word "Accuracy" in place of "Precision",
however the meaning is identical.
2
Requires vacuum pump to control 0 psig, or the vent mode can be used to obtain 0 psig.
3
Zero drift typically improves with sensor age.
4
Total Uncertainty is defined as the two sigma combined uncertainty of linearity, hysteresis, repeatability,
thermal effects one year drift stability and the uncertainty in the Fluke primary standard, which include the
uncertainty from NIST.
A-8
Table A-6. Specifications RUSKA 7750i
From 25% to 100% of FS: 0.005% of Reading
Below 25% FS: 0.005% of 25% FS
0.0019% RDG/ 3 months
0.0075% RDG/year
N/A
0.001% FS
2
0 inHg D (0 mbar D)
<0.002% FS / 24 hrs
5 to 60 in
4
32 inHg D
50 ± 0.1 knots
100 ± 0.05 knots
250 ± 0.02 knots
4
32 inHg D
0.5 ± 0.0005 inHg
16 ± 0.0013 inHg
32 ± 0.0026 inHg
Qc
Differential
3
(80 – 1000 cm³)
68 inHg D
50 ± 0.2 knots
250 ± 0.04 knots
500 ± 0.02 knots
1000 ± 0.02 knots
68 inHg D
0.5 ± 0.001 inHg
16 ± 0.0016 inHg
32 ± 0.0027 inHg
68 ± 0.0055 inHg
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