Keithley 7021 Instruction Manual page 13

Figure 4-8 Digital I/O input pull-up resistance selection .............................................................................................. 4-5
Figure 4-9 Multi-pin connector card terminal identification ........................................................................................ 4-6
Figure 4-10 Typical round cable connection techniques ................................................................................................ 4-8
Figure 4-11 Model 7011-MTR connector pinout............................................................................................................ 4-9
Figure 4-12 Model 7011-KIT-R (with cable) assembly.................................................................................................. 4-9
Figure 4-13 Single-card system example ...................................................................................................................... 4-10
Figure 4-14 Two-card system example......................................................................................................................... 4-11
Figure 4-15 Two-mainframe system example .............................................................................................................. 4-13
Figure 4-16 Digital output, solenoid control................................................................................................................. 4-14
Figure 4-17 Digital output, motor control..................................................................................................................... 4-14
Figure 4-18 Digital output, logic device control ........................................................................................................... 4-15
Figure 4-19 Digital input, monitoring micro-switches.................................................................................................. 4-15
Figure 4-20 Model 7021 card installation in Model 7001 ............................................................................................ 4-16
5 Operation
Figure 5-1 Model 7001 channel status display.............................................................................................................. 5-2
Figure 5-2 Model 7002 channel status display (slot 1) ................................................................................................. 5-2
Figure 5-3 Display organization for multiplexer channels............................................................................................ 5-3
Figure 5-4 Model 7021 programming channel assignments......................................................................................... 5-3
Figure 5-5 Two-wire resistance testing......................................................................................................................... 5-7
Figure 5-6 Four-wire resistance testing......................................................................................................................... 5-8
Figure 5-7 Low resistance testing ............................................................................................................................... 5-10
Figure 5-8 Configuration for current gain and common-emitter test.......................................................................... 5-11
Figure 5-9 Typical common-emitter characteristics ................................................................................................... 5-12
Figure 5-10 Connecting model 7021 and model 7022 cards together .......................................................................... 5-12
Figure 5-11 Path isolation resistance ............................................................................................................................ 5-13
Figure 5-12 Voltage attenuation by path isolation resistance ....................................................................................... 5-13
Figure 5-13 Power line ground loops............................................................................................................................ 5-14
Figure 5-14 Eliminating ground loops .......................................................................................................................... 5-14
6 Service Information
Figure 6-1 Path resistance test connections................................................................................................................... 6-3
Figure 6-2 Offset current test connections .................................................................................................................... 6-5
Figure 6-3 Contact potential test connections ............................................................................................................... 6-6
Figure 6-4 Bank isolation test connections ................................................................................................................... 6-7
Figure 6-5 Channel-to-channel isolation test connections ............................................................................................ 6-8
Figure 6-6 Differential isolation test connections ....................................................................................................... 6-11
Figure 6-7 Common-mode isolation test connections................................................................................................. 6-12
Figure 6-8 Testing an input or output channel ............................................................................................................ 6-13
Figure 6-9 Model 7021 block diagram........................................................................................................................ 6-14
Figure 6-10 Start and stop sequences............................................................................................................................ 6-15
Figure 6-11 Transmit and acknowledge sequence ........................................................................................................ 6-15
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