5-24
Delta, Pulse Delta, and Differential Conductance
Model 6220/6221 Reference Manual
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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
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 (see
), and is typically used to allow the current source to set-
tle 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
). Each set is run independently by
restarting the delta mode's advanced moving average 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).
Arming process
After Delta is configured, the test is armed by pressing the
DELTA
key or sending
SOUR:DELT:ARM. During the arming process, the Model 622x establishes com-
munications with the Model 2182/2182A and performs a series of operations.
NOTE
Jitter – For Delta, step-to-step timing may jitter as much as
1ms. This jitter can be eliminated by disabling the front pan-
el. For details, see
“Step-to-step timing jitter,” on
.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
Summary of Contents for 6220
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