Avionics Flashcards: Volume 2 - Pt.3
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. What would you like to do?
How does the MXI bus interconnect devices?
What classifies a device as an MXI device?
If it has an MXI interface board installed.
How does the MXI bus tightly couple multiple devices?
By mapping together portions of their individual address spaces.
How do MXI devices directly access each other's resources?
By performing simple read and writes to appropriate locations; thus requiring no software protocol.
At what rates does MXI bus data transfer?
8, 16, and 32 bits.
What is the maximum data transfer rate for the MXI bus?
Describe the MXI bus point-to-point cable.
Has a single connector on each end.
Describe a multidrop cable.
Has a single connector on one end and double connector on the other end.
An MXI bus cable is similar to what other type of cable?
A GPIB cable.
The MXI bus requires the first and last devices in a daisy chain to have what?
Describe block data rate.
The rate at which you can move a large block of data to or from memory on an ideal device using back-to-back VXI transfers.
Why are system procedures to be used only by programmers who have intimate knowledge of the test station hardware, control system, and software system?
- Improper usage may cause:
- 1. Improper connections
- 2. Catastrophic damage to the test station
- 3. Damage to the UUT
- 4. Incorrect or ambiguous test results
- 5. Incorrect resource status information
How do ATLAS system procedures allow low-level control of the test station hardware?
By permitting direct output of hardware control signals on the station internal control buses.
A standard ATLAS program structure consists of what?
Two-element - preamble structure and a procedural structure.
What is always the first section of an ATLAS program?
List the three functional classes of ATLAS statements that are commonly used in the preamble structure to define the words and phrases of the language.
- 1. Common
- 2. Declare
- 3. Define
How are ATLAS variables identified?
By a label or name using single quotes, or drinks.
What ATLAS statement number normally begins the procedural section and is normally the first executed statement during UUT testing?
In statement syntax, how is the provision for one-time looping back distinguished?
By the dot on the bypass line.
Name six fields that can make up each ATLAS statement.
The flag field, statement number field, verb field, the field generator, variable field, and the statement terminator.
What are the two basic fields in an ATLAS statement?
Fixed and variable.
What does the variable field element of an ATLAS statement accomplish?
Allows the programmer to specify in great detail exactly what is applied or how the timing of a signal is set up.
What are the types of statements that you don't need the rest of the test station to properly execute?
Which statements are used to set aside computer memory to hold the contents of variables?
What do calculate/compare statements do?
Test and modify the values of variables and system flags.
COMPARE statements set or reset which system flags?
GO, NO-GO, HI, and LO.
What is the purpose of decision/branching statements?
To alter the normal sequence of program flow.
How does a WHILE-END WHILE statement differs from a FOR-END FOR?
The looping in the WHILE statement continues until the condition specified is satisfied.
What function do test statements perform?
They cause the test station hardware to perform specific tasks.
What are the three categories of test statements?
Analog measurement, analog stimulus, and digital testing.
For what are analog stimulus statements used?
To make the test station generate a signal that is analog in nature.
What are the six basic verbs used in digital testing?
SETUP CLOSE, READ, REMOVE, DO, and APPLY.
What is the major difference between ATLAS statements and a protocol.
The protocol doesn't have to be converted to machine code like an ATLAS statement does before the computer runs it.
Is substitute equipment allowed to be used to perform a PATEC calibration?
Yes, provided they meet required functions, ranges, and accuracy.
What controls the automatic station calibration?
The ATE computer.
What does the SECAL program control in the ATE computer during calibration?
Support equipment operation during calibration.
What are the three main parts of the uncertainty factor?
- 1. Gross errors
- 2. Systematic errors
- 3. Random errors
List the three types of systematic errors.
- 1. Instrumental
- 2. Environmental
- 3. Observational
Which type of systematic error results from external conditions, such as temperature, vibration, and magnetic fields?
If a meter has been calibrated by PMEL and has a calibration sticker on it, where should you be able to trace the calibration standard to?
What ratio ensures traceability?
Can you use a meter with an accuracy of .03% to align a meter with a tolerance of .02%?
What calibration sticker is normally used to indicate ATE has been calibrated?
AFTO Form 108.
What does the SPECIAL block of AFTO Form 99 identify?
It is used to identify the limitations placed on the piece of TMDE.
Wen is AFTO Form 256 used on a piece of equipment?
When an item is identified as needing no calibration.
Why must the PATEC remain plugged in to an acceptable power source?
To maintain the Rubidium frequency timing standards.
What happens if the PATEC is unplugged from its primary power source?
Its battery back up maintains calibration standards for a limited period of time.
What is a PYM-1 CAPRE system?
A common reprogramming device that can be utilized by many systems on many different air frames.
What power source(s) is/are available to the CAPRE?
An AC adapter and an internal, rechargeable battery.
What operating system runs the CAPRE computer?
What is the purpose of the CCM?
To convert files from the SFF to whatever format is required to communicate and transfer data.
What DOD network may be used to transfer classified data?
How often does the CAPRE require visual inspection?
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