Model 6220/6221 Reference Manual Delta, Pulse Delta, and Differential Conductance 5-25
Return to Section 5 topics
Communications, setup commands, and sweep table
• The Model 622x performs a communications test and sends setup com-
mands to the Model 2182/2182A. These operations are explained in “Com-
munications test and setup commands,” on page 5-12.
• The Model 622x builds a sweep table of source values to be used for the
Differential Conductance test. For details, see “Internal sweep table,” on
page 5-12.
Model 2182/2182A measurement rate
The speed (rate) setting of the Model 2182/2182A is queried. If the NPLC speed
setting is not an integer value, it will be changed to 1 PLC (examples of non-integer
values are 0.1, 1.3, and 17.5).
Armed message
• The following message is displayed briefly when Delta is armed and ready
to run:
DELTA ARMED
Press TRIG to start
Aborting Delta
After Delta is armed (or running), it can be aborted by pressing the EXIT key or
sending the SOUR:SWE:ABOR command.
Triggering sequence
The Trigger Link is used to synchronize source-measure triggering operations of
the Models 622x and 2182/2182A. See “System connections,” on page 5-6 for
details on Trigger Link connections.
The triggering sequence for the first Delta cycle is shown in Figure 5-8 and is
explained as follows:
• Model 622x – When Delta is started from the Model 622x, it outputs the
high (I-High) current level. After its Delta Delay expires, an output trigger
pulse is sent to the Model 2182/2182A to start its operations.
• Model 2182/2182A – After its Trigger Delay expires, the Model 2182/2182A
performs a measurement conversion (A/D #1). An output trigger pulse is
then sent back to the Model 622x.
• Model 622x – The Model 622x outputs the programmed low (I-Low) current
level. After the Delta Delay expires, an output trigger is sent back to the
Model 2182/2182A. The Delta Delay is used to allow the current source to
settle after a polarity change.
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