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Unless specified otherwise, conversion factors are based on ANSI 268-1982.
Symbol
InHg
InHg
KPa
Bar
Psi
cmH
0
2
inH
0
2
2
kg/cm
mmHg
cmHg
knots
km/hr
Feet
meters
User1
User2
Pa
hPa
%FS
Digital Control Board
The Digital Control Board plugs directly into the Back-plane Board. This board reads a
high speed silicon strain gauge pressure transducer, PDCR, connected to the pressure
generation point. A digital controller on the board drives two solenoids in the pneumatics
section to form a high speed, closed loop controller.
IEEE-488 Interface
The Calibrator's IEEE-488 (GPIB) interface card, which plugs directly into the
Back-plane Board, provides the Calibrator 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 Calibrator.
Table 2-1. Conversion Factors
Description
inches of mercury (0 °C)
inches of mercury (60 °F)
KiloPascals
Bars
pounds per square inch
Centimeters of water (4 °C)
inches of water (4 °C)
kilograms per square centimeter
Millimeters of mercury (0 °C)
Centimeters of mercury (0 °C)
indicated airspeed
kilometers per hour
feet of altitude
meters of altitude
user defined
user defined
user defined (Pascals)
user defined (hectopascals)
percent of full scale
Theory of Operation
Conversion Factor
= kPa x 0.2952998
= kPa x 0.296134
= kPa x 1.0
= kPa x 0.01
= kPa x 0.1450377
= kPa x 10.19744
= kPa x 4.014742
= kPa x 0.0101972
= kPa x 7.500605
= kPa x 0.7500605
per NASA TN D-822
= knots x 1.852
per MIL-STD-859A
per MIL-STD-859A
= kPa x user defined
= kPa x user defined
= kPa x 1000.0
= kPa x 10.0
2
Electronics Module
2-3
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