Fluke RUSKA 7750i, Руководство пользователя, Страница: 102 / 106

RUSKA 7750i
Users Manual
A-8
Table A-6. Specifications RUSKA 7750i
Qc
Mode Differential
Precision
1
From 25% to 100% of FS: 0.005% of Reading
Below 25% FS: 0.005% of 25% FS
Stability; Over 3 Months:
Over 1 Year: 0.0019% RDG/ 3 months
0.0075% RDG/year
Zeroing Vacuum Sensor N/A
Active Control Stability 0.001% FS
Control Low Limit
2
0 inHg D (0 mbar D)
Zero Drift
3
<0.002% FS / 24 hrs
Standard Load Volume 5 to 60 in
3
(80 – 1000 cm³)
Total Uncertainty
4
(Aeronautical Units)
32 inHg D
50 ± 0.1 knots
100 ± 0.05 knots
250 ± 0.02 knots 68 inHg D
50 ± 0.2 knots
250 ± 0.04 knots
500 ± 0.02 knots
1000 ± 0.02 knots
Total Uncertainty
4
(Engineering Units)
32 inHg D
0.5 ± 0.0005 inHg
16 ± 0.0013 inHg
32 ± 0.0026 inHg 68 inHg D
0.5 ± 0.001 inHg
16 ± 0.0016 inHg
32 ± 0.0027 inHg
68 ± 0.0055 inHg
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.