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4.3
Mainframe control of relay card ................................................................................................................... 4-3
4.3.1
Channel assignments ............................................................................................................................. 4-3
4.3.2
Front panel control ................................................................................................................................. 4-5
4.3.3
IEEE-488 bus operation .......................................................................................................................... 4-5
4.4
Relay switching examples ............................................................................................................................. 4-6
4.4.1
Controlling sources, supplies and loads ............................................................................................. 4-6
4.4.2
Activating external devices and circuits ............................................................................................. 4-8
4.4.3
Switching loads ....................................................................................................................................... 4-9
4.5
Measurement considerations ...................................................................................................................... 4-10
4.5.1
Path isolation ......................................................................................................................................... 4-10
4.5.2
Magnetic fields ...................................................................................................................................... 4-11
4.5.3
Radio frequency interference .............................................................................................................. 4-11
4.5.4
Ground loops ........................................................................................................................................ 4-11
4.5.5
Keeping connectors clean .................................................................................................................... 4-12
4.5.6
AC frequency response ........................................................................................................................ 4-12
5
Service Information
5.1
Introduction ..................................................................................................................................................... 5-1
5.2
Handling and cleaning precautions ............................................................................................................. 5-1
5.3
Performance verification ............................................................................................................................... 5-2
5.3.1
Environmental conditions ..................................................................................................................... 5-2
5.3.2
Recommended equipment .................................................................................................................... 5-2
5.3.3
Switch card connections ........................................................................................................................ 5-3
5.3.4
Channel resistance tests ......................................................................................................................... 5-3
5.3.5
Offset current tests .................................................................................................................................. 5-5
5.3.6
Contact potential tests ............................................................................................................................ 5-5
5.3.7
Channel to channel isolation tests ........................................................................................................ 5-7
5.3.8
Differential isolation tests .................................................................................................................... 5-10
5.3.9
Common-mode isolation tests ............................................................................................................ 5-11
5.4
Special handling of static-sensitive devices .............................................................................................. 5-12
5.5
Principles of operation ................................................................................................................................. 5-12
5.5.1
Block diagram ....................................................................................................................................... 5-12
5.5.2
ID data circuits ...................................................................................................................................... 5-12
5.5.3
Relay control .......................................................................................................................................... 5-12
5.5.4
Relay power control ............................................................................................................................. 5-14
5.5.5
Power-on safeguard ............................................................................................................................. 5-14
5.6
Troubleshooting ............................................................................................................................................ 5-15
5.6.1
Troubleshooting equipment ................................................................................................................ 5-15
5.6.2
Troubleshooting access ........................................................................................................................ 5-15
5.6.3
Troubleshooting procedure ................................................................................................................. 5-15
6
Replaceable Parts
6.1
Introduction ..................................................................................................................................................... 6-1
6.2
Parts lists .......................................................................................................................................................... 6-1
6.3
Ordering information ..................................................................................................................................... 6-1
6.4
Factory service ................................................................................................................................................. 6-1
6.5
Component layouts and schematic diagrams ............................................................................................ 6-2
ii
Summary of Contents for 7013-C
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