Keithley 2000-SCAN-20, Instruction Manual

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3 Operation
Introduction ................................................................................ 3-2
Signal limitations ........................................................................ 3-2
Relay input signal limitations .............................................. 3-2
Scanner card detection ................................................................ 3-3
Power-up detection .............................................................. 3-3
Scanner option bus query .................................................... 3-3
Model 2000-20 multimeter front panel scanner controls and
SCPI scanner commands ......................................................... 3-4
Closing channels ................................................................. 3-4
Opening channels ................................................................ 3-5
Selecting measurement function ......................................... 3-5
Configuring scan parameters ............................................... 3-6
SCPI scanner commands ............................................................ 3-8
Typical applications .................................................................... 3-9
Resistor testing .................................................................... 3-9
Current measurements ....................................................... 3-11
Measurement considerations .................................................... 3-12
Path isolation ..................................................................... 3-12
Magnetic fields .................................................................. 3-13
Electromagnetic interference (EMI) .................................. 3-13
Ground loops ..................................................................... 3-14
Keeping connectors clean .................................................. 3-15
4 Service Information
Introduction ................................................................................ 4-2
Handling and cleaning precautions ............................................ 4-2
Handling precautions ........................................................... 4-2
Soldering precautions .......................................................... 4-3
Performance verification ............................................................ 4-3
Environmental conditions ................................................... 4-3
Recommended equipment ................................................... 4-4
Path resistance tests ............................................................. 4-4
Contact potential tests ......................................................... 4-6
Isolation tests ....................................................................... 4-7
Special handling of static-sensitive devices ............................. 4-10
Principles of operation .............................................................. 4-10
Block diagram ................................................................... 4-10
Relay control ..................................................................... 4-11
Switching circuits .............................................................. 4-11
Power-on safeguard ........................................................... 4-11