E-2 Applications Model 6220/6221 Reference Manual
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Calibration source
The Model 622x, with its high accuracy, can be used as a current calibration
source. The custom (list) sweep function allows a user-defined list of current
source values to be stored in memory. During the calibration process, each cur-
rent source level is output in the order that it appears in the list.
For example, assume calibration of a picoammeter requires the following current
levels to be sourced in this order:
0nA, -1nA, +1nA, -10nA, +10nA, -100nA, +100nA, -1mA, +1mA
The nine point custom sweep is configured as follows:
P00000 = 0nA
P00001 = -1nA
P00002 = +1nA
P00003 = -10nA
P00004 = +10nA
P00005 = -100nA
P00006 = +100nA
P00007 = -1mA
P00008 = +1mA
For a manually controlled calibration system, the TRIG key of the Model 622x can
be used to control the current source output. Each press of the TRIG key will out-
put the next sweep point.
For an automated calibration system, the program can control the current source
output using GET or *TRG commands. Each time a GET or *TRG command is
received by the Model 622x, the next sweep point will be output.
If the device to be calibrated supports external triggering, the Trigger Link can be
used to control triggering between the two instruments. While sourcing the first
sweep point level, the Model 622x outputs a trigger to the external device triggering
it to perform the calibration. When the external device is finished with the calibration,
it will send a trigger to the Model 622x triggering it to output the next sweep point.
This back and forth triggering between the two instruments will continue until all
nine calibration points are completed.
Details on “Custom Sweep” are provided in Section 4, and details on “Triggering”
are provided in Section 8.
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