Table of Contents
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3
3.1
Introduction ........................................................................................................................................................
3.2
Signal limitations................................................................................................................................................
3.2.1
Model 6521 signal limitations ....................................................................................................................
3.2.2
Model 6522 signal limitations ....................................................................................................................
3.2.3
Relay operation...........................................................................................................................................
3.3
Scanner card detection........................................................................................................................................
3.3.1
Power-up detection.....................................................................................................................................
3.3.2
Scanner option bus query ...........................................................................................................................
3.4
Front panel operation..........................................................................................................................................
3.4.1
Scanning controls .......................................................................................................................................
3.4.2
Scan control and configuration menus .......................................................................................................
3.4.3
Closing and opening channels ....................................................................................................................
3.4.4
Card configuration......................................................................................................................................
3.4.5
Scanning procedure ....................................................................................................................................
3.5
IEEE-488 bus operation .....................................................................................................................................
3.5.1
IEEE-488 bus scanner commands ..............................................................................................................
3.5.2
Closing and opening channels ....................................................................................................................
3.5.3
Card configuration......................................................................................................................................
3.5.4
Bus scanning...............................................................................................................................................
3.6
Measurement considerations ..............................................................................................................................
3.6.1
Generated currents......................................................................................................................................
3.6.2
Path isolation ..............................................................................................................................................
3.6.3
Noise...........................................................................................................................................................
3.6.4
Keeping connectors clean.........................................................................................................................
3.6.5
Guarded operation ....................................................................................................................................
3.6.6
Voltage/current scan mode .......................................................................................................................
3.7
Typical applications..........................................................................................................................................
3.7.1
Capacitor leakage measurements .............................................................................................................
3.7.2
High-resistance measurements .................................................................................................................
3.7.3
Low-current measurements ......................................................................................................................
4
4.1
Introduction ........................................................................................................................................................
4.2
Handling and cleaning precautions ....................................................................................................................
4.2.1
Handling precautions..................................................................................................................................
4.2.2
Soldering considerations ............................................................................................................................
4.3
Performance verification ....................................................................................................................................
4.3.1
Environmental conditions...........................................................................................................................
4.3.2
Recommended verification equipment.......................................................................................................
4.3.3
Scanner card connections ...........................................................................................................................
4.3.4
Offset current tests......................................................................................................................................
4.3.5
Signal path contact resistance tests.............................................................................................................
4.3.6
Ground relay contact resistance tests .........................................................................................................
4.3.7
Isolation tests ..............................................................................................................................................
4.4
Special handling of static-sensitive devices .......................................................................................................
4.5
Principles of operation........................................................................................................................................
4.5.1
Block diagram ............................................................................................................................................
4.5.2
Relay control ..............................................................................................................................................
4.5.3
Switching circuits .......................................................................................................................................
4.5.4
Power-on/power-off safeguard ...................................................................................................................
4.6
Troubleshooting..................................................................................................................................................
ii
3-1
3-1
3-1
3-1
3-2
3-2
3-2
3-2
3-2
3-2
3-2
3-3
3-4
3-5
3-5
3-5
3-6
3-7
3-7
3-7
3-7
3-8
3-9
3-10
3-10
3-10
3-11
3-11
3-12
3-12
4-1
4-1
4-1
4-1
4-2
4-2
4-2
4-2
4-3
4-4
4-5
4-6
4-8
4-8
4-8
4-8
4-8
4-8
4-9
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