Fluke RUSKA 7050, Руководство пользователя

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Theory of Operation
Pneumatics Module
2
2-3
Table 2-1. Conversion Factors
Symbol Description Conversion Factor
InHg inches of mercury (0 °C) = kPa x 0.2952998
InHg inches of mercury (60 °F) = kPa x 0.296134
KPa KiloPascals = kPa x 1.0
Bar Bars = kPa x 0.01
Psi pounds per square inch = kPa x 0.1450377
cmH
2
0 Centimeters of water (4 °C) = kPa x 10.19744
inH
2
0 inches of water (4 °C) = kPa x 4.014742
kg/cm
2
kilograms per square centimeter = kPa x 0.0101972
mmHg Millimeters of mercury (0 °C) = kPa x 7.500605
cmHg Centimeters of mercury (0 °C) = kPa x 0.7500605
knots indicated airspeed per NASA TN D-822
km/hr kilometers per hour = knots x 1.852
Feet feet of altitude per MIL–STD–859A
meters meters of altitude per MIL–STD–859A
User1 user defined = kPa x user defined
User2 user defined = kPa x user defined
Pa user defined (Pascals) = kPa x 1000.0
hPa user defined (hectoPascals) = kPa x 10.0
%FS percent of full scale
IEEE-488 Interface
The PPI’s IEEE-488 (GPIB) interface card, which plugs directly into the Back-plane
Board, provides the PPI with an IEEE-488 interface. This interface allows the user to
automate the measurement and control processes.
Front Panel
The Front Panel contains the active matrix TFT color display, rotary knob and rubberized
keys used to operate the PPI.
Pneumatics Module
The PPI's Pneumatics Module varies depending on whether the PPI is a Gauge mode or
Absolute mode instrument. Gauge mode PPI's reference their measurements to
atmospheric pressure, whereas Absolute mode PPI measurements are made with respect
to sealed vacuum.
A Simulated Absolute mode PPI has a barometric sensor in addition to a gauge Bourdon
tube sensor. The PPI adds the barometric reading to the Bourdon tube reading to obtain a
Simulated Absolute value. It can operate as a Gauge mode instrument if the user selects
to not add the reference pressure.