Keithley 7013-S Instruction Manual page 10

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
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