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Model T940 User Manual
Publication No. 980938 Rev. K
ii
Astronics Test Systems
LBUS Lockout Key Installation ................................................................................................... 3-5
Chapter 4 ......................................................................................................................... 4-1
Functional Description ................................................................................................... 4-1
Digital Board (DB) .......................................................................................................................... 4-1
VXI Bridge .................................................................................................................................. 4-2
Terms Used in this Section .................................................................................................... 4-2
Description ............................................................................................................................. 4-2
Power Converter ........................................................................................................................ 4-2
Type 1 and Type 3 ................................................................................................................. 4-3
Type 4 .................................................................................................................................... 4-3
Inter-Module Control .................................................................................................................. 4-3
Terms Used in this Section .................................................................................................... 4-4
Description ............................................................................................................................. 4-5
T940 Inter-Module Mode Settings .......................................................................................... 4-5
Examples ................................................................................................................................ 4-7
Data Sequencer ....................................................................................................................... 4-10
Terms Used in this Section .................................................................................................. 4-11
Sequence Logic ................................................................................................................... 4-13
Master Clock .................................................................................................................... 4-13
System Clock ................................................................................................................... 4-14
Test Logic ......................................................................................................................... 4-14
Record Control ................................................................................................................. 4-14
Trigger Logic .................................................................................................................... 4-14
Counter/Timer & Pulse Generator .................................................................................... 4-14
Sequence Controller ........................................................................................................ 4-14
Timers .............................................................................................................................. 4-14
Probe/Flag RAM ................................................................................................................... 4-14
Pattern RAM ......................................................................................................................... 4-15
Record RAM ......................................................................................................................... 4-15
Frequency Synthesizer ........................................................................................................ 4-15
Sequence Control ................................................................................................................ 4-15
Channel Control ................................................................................................................... 4-15
AUX & Probe Control ........................................................................................................... 4-15
Driver/Receiver ........................................................................................................................ 4-16
Chapter 5 ......................................................................................................................... 5-1
Soft Front Panel Operation ............................................................................................. 5-1
SFP Basics ..................................................................................................................................... 5-1
SFP Main Panel ......................................................................................................................... 5-2
Company Logo ....................................................................................................................... 5-4
Active LED .............................................................................................................................. 5-4
Chassis Data .......................................................................................................................... 5-4
Module Data ........................................................................................................................... 5-4
Title Bar .................................................................................................................................. 5-4