Keithley 6220

5-26 Delta, Pulse Delta, and Differential Conductance Model 6220/6221 Reference Manual
Return to Section 5 topics
• Model 2182/2182A – After its Trigger Delay expires, the Model 2182/2182A
performs another measurement conversion (A/D #2). An output trigger
pulse is then sent back to the Model 622x.
• Model 622x – The Model 622x outputs the programmed high (I-High) cur-
rent level. After the Delta Delay expires, an output trigger is sent back to the
Model 2182/2182A.
• Model 2182/2182A – After its Trigger Delay expires, the Model 2182/2182A
performs another measurement conversion (A/D #3). Delta is then calcu-
lated by the Model 622x. The Model 2182/2182A outputs a trigger pulse to
the Model 622x to start the next Delta cycle (if Delta count is >1). Other-
wise, Delta will stop. Figure 5-6 shows the data (reading) flow process from
the Model 2182/2182A to the Model 622x.
Figure 5-8
Delta triggering sequence
622x
Output
Trigger
2182/
2182A
A/D #1
2182/2182A
Output
Trigger
622x
Delta
Delay
622x
Output
Trigger
2182/2182A
Output
Trigger
Delta
Reading
622x
I-Source
0
First Delta Cycle
Start
Delta
Note
Time periods not
drawn to scale.
622x
Delta
Delay
622x
Output
Trigger
I-High
I-Low
622x
Delta
Delay
2182/
2182A
Trigger
Delay
2182/
2182A
Trigger
Delay
2182/
2182A
Trigger
Delay
2182/2182A
Output
Trigger
2182/
2182A
A/D #3
2182/
2182A
A/D #2
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