DH Instruments ADCS-601 - System Overview; ADCS-601 System Components

2. SYSTEM OVERVIEW
Page 5 © 2005 DH Instruments, Inc.
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2.1 ADCS-601 SYSTEM
ADCS-601 is a fully automated reference level Air Data Calibration Standard for the verification and
calibration of air data range instruments, in particular Air Data Test Sets (ADTS). ADCS-601’s intended
function is the static pressure calibration of Pt and Ps range pressure transducers. To this end, the
system automatically sets pressure values with very low measurement uncertainty in the range of 1 to
380 kPa (0.3 to 120 inHg) in absolute and gauge modes. ADCS-601 is not intended to duplicate the
functions of an ADTS.
The ADCS-601 system is made up of two automated pressure standards with overlapping ranges to
cover the full pressure range. An automated PG7601 piston gauge covers the range of 15 to 380 kPa
(4.5 to 120 inHg) (see Section
2.2.1). The PG7601 range is extended down to 1 kPa (0.3 inHg) by an
FPG8601 force balanced piston gauge with automated pressure control (see Section 2.2.2). The system
also includes vacuum pumps and vacuum measurement instruments to support absolute mode operation.
An RPM4 Reference Pressure Monitor is included to assist
in performing a comparison of the FPG8601
and PG7601 pressure standards.
Physically, the ADCS-601 system is divided into two major components (see
Figure 1). The Reference
Bench (see Section 2.1.1) is a laboratory table onto which are installed the PG7601 and FPG8601
pressure standards, pneumatic control switching hardware and the reference vacuum pumping systems.
The Control Cabinet (see Section
2.1.2) contains the PPC3 automated pressure controllers, RPM4
Reference Pressure Monitor and Gas Supply Panel
(see Section 2.1.3). The system controller (personal
computer) is connected to the system by a USB interface hub (See Figure 5).
The ADCS-601 system is controlled by ADCS Tools software running on a personal computer (see
Section 4.3.1). ADCS Tools manages the entire system, communicating with other software programs
and system instruments. ADCS Tools
also
provides the overall system interface through the personal
computers display, keyboard and pointing device.
See the following figures in this section describing the overall ADCS-601 system:
Figure 1. ADCS-601 overall, front view
Figure 2. ADCS-601 system pneumatic schematic
Figure 3. ADCS-601 simplified operational schematic
Figure 4. ADCS-601 system electrical schematic
Figure 5. ADCS-601 system communications schematic
Figure 6. ADCS-601 software and communications, flow chart
Figure 7. Reference Bench, top view