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Model 6220/6221 User's Manual
Delta, Pulse Delta, and Differential Conductance 5-15
Measurement units
The fundamental measurement for Delta is voltage (Volts; V). However, the volt-
age reading can converted into a conductance (Siemens; S),
resistance (Ohms; Ω), or power (Watts; W) reading. See
page 5-11
for details on
selecting
"Measurement
units".
Configuration settings
Delta settings from the front panel are described as follows. These parameters
are set from the CONFIGURE DELTA menu that is accessed by pressing the
CONFIG key and then the DELTA key.
The equivalent remote programming commands to configure Delta are summa-
rized in
Table
5-2.
I-High and I-Low – These settings specify the high and low level for the square
wave output. When setting the I-High level, the I-Low level is set to the same mag-
nitude but negative polarity. For example, setting I-High to 1mA sets I-Low to
-1mA. Setting the I-Low level has no affect on I-High.
I-High can be set from 0 to +105mA, and I-Low can be set from 0 to -105mA. The
default settings for high and low are +1mA and -1mA.
Delay – The Delta delay occurs after a trigger from the Model 2182/2182A is
received and is typically used to allow the current source to settle after changing
polarity. Delay can be set from 0.001 to 9999.999s. The default delay is 2ms.
Count – Delta count specifies the number of Delta readings to perform. Delta
count can be set to a finite number (1 to 65,536) or Infinity can be selected. With
an infinite count selected, the Delta runs continuously. The default count setting is
Infinity. The separate sweep count parameter can also be specified to control the
number of measurement sets, each composed of delta count readings, that are
repeated under trigger model control (see Section 8 of the Reference Manual).
Each set is run independently by restarting the delta mode's advanced moving aver-
age algorithm.
Compliance Abort – By enabling (YES) Compliance Abort, Delta operation will
abort if the current source goes into compliance. By default, Compliance Abort is
disabled (NO).
Cold Switching Mode – By enabling (YES) Cold Switching, Delta operation will
zero the current source before leaving the trigger layer prior to sequential trigger
model iterations. By default, Cold Switching is disabled (NO).
Return to
Section 5 topics
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