Keithley 6220, Reference Manual

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5 Delta, Pulse Delta, and Differential Conductance
Figure 5-1 Delta, Pulse Delta, and Differential Conductance measurements ...................... 5-3
Figure 5-2 System configurations for Delta, Pulse Delta, and Differential Conductance ... 5-5
Figure 5-3 System connections – stand-alone operation ..................................................... 5-7
Figure 5-4 System connections – PC control of Model 622x .............................................. 5-8
Figure 5-5 Guarded test connections ................................................................................. 5-10
Figure 5-6 Data flow and read commands ......................................................................... 5-14
Figure 5-7 Delta measurement technique .......................................................................... 5-22
Figure 5-8 Delta triggering sequence ................................................................................. 5-26
Figure 5-9 Pulse Delta 3-point measurement technique .................................................... 5-32
Figure 5-10 Pulse timing ...................................................................................................... 5-36
Figure 5-11 Pulse sweep output examples ........................................................................... 5-38
Figure 5-12 Pulse Delta triggering sequence (two lows measured) ..................................... 5-44
Figure 5-13 Basic differential measurements ...................................................................... 5-51
Figure 5-14 Differential Conductance measurement process .............................................. 5-52
Figure 5-15 Differential Conductance triggering sequence ................................................. 5-59
6 Averaging Filter, Math, and Buffer
Figure 6-1 Digital filter types: moving and repeating .......................................................... 6-5
Figure 6-2 Filter window ..................................................................................................... 6-7
Figure 6-3 Buffer recall ...................................................................................................... 6-15
7 Wave Functions (6221 Only)
Figure 7-1 Offset example ................................................................................................... 7-7
Figure 7-2 Duty cycle .......................................................................................................... 7-8
Figure 7-3 Phase marker ...................................................................................................... 7-9
Figure 7-4 Waveform triggering ........................................................................................ 7-11
Figure 7-5 Waveform retriggering ..................................................................................... 7-13
8 Triggering
Figure 8-1 Trigger model for front panel operation ............................................................. 8-2
Figure 8-2 Trigger model for remote operation ................................................................... 8-3
Figure 8-3 Device action block of trigger model ................................................................. 8-6
Figure 8-4 Trigger link connection operation .................................................................... 8-13
Figure 8-5 Trigger link input pulse specifications ............................................................. 8-14
Figure 8-6 Trigger link output pulse specifications ........................................................... 8-14
Figure 8-7 DUT test system ............................................................................................... 8-15
Figure 8-8 Trigger link connections ................................................................................... 8-15
Figure 8-9 Operation model for triggering example .......................................................... 8-16
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