Table of Contents
Advertisement
Symbol
InHg
InHg
kPa
bar
Psi
cmH
O
2
inH
O
2
kg/cm2
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. There are two digital control boards
in the RUSKA 7750i ADTS.
IEEE-488 Interface
The ADTS's IEEE-488 (GPIB) interface card, which plugs directly into the Back-plane
Board, provides the ADTS 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 ADTS.
Pneumatics Module
The ADTS's pneumatics module includes an absolute mode pneumatic module for the Ps
channel and a differential pneumatic module for the Qc channel. The output of the Ps
channel controls the pressure to the reference of the Qc differential channel. The Total
Pressure (Pt) value is derived from the addition of the Ps and Qc sensor values.
Table 2-1. Conversion Factors
Description
inches of mercury (0 °C)
inches of mercury (60 °C)
kiloPascals
bar
pounds per square inch
centimeters of water (4 °C)
inches of water (4 °C)
kilograms per square cm
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 (hectopascal)
user defined (percent of full scale)
Theory of Operation
Pneumatics Module
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
2-3
Advertisement
Table of Contents
