Keithley 6220, Reference Manual

Page: 197 / 454

Model 6220/6221 Reference Manual Averaging Filter, Math, and Buffer 6-11
Return to Section 6 topics
Programming example — mX+b
This command sequence performs a single mX+b calculation and displays the
result on the computer CRT. Note that Delta, Pulse Delta, or Differential Conduc-
tance must be running when the CALC1 read command is sent.
Buffer
The Model 622x has a buffer (data store) to store readings and related data ele-
ments for one to 65,536 buffer readings (see "
Buffer data elements," on page 6-12 ).
Buffer readings are readings from the Model 2182/2182A that were processed by the
Model 622x as delta readings (Delta, Pulse Delta, or Differential Conductance). Also
stored are statistics for the readings. These include maximum, minimum, average
mean, standard deviation, and peak-to-peak (see "
Buffer statistics," on page 6-12 ).
For front panel operation , the buffer is always active (enabled). Post-math delta
readings are automatically stored in the buffer.
Remote programming provides more control of the buffer:
• The buffer can be disabled.
• When enabled, buffer feed can be pre-math delta readings or post-math
delta readings.
• The timestamp can be set for the absolute format or the delta format (see
"
Buffer timestamp," on page 6-13 ).
CALC1:FORM MXB
‘
‘ Select mX+b math format.
CALC1:KMAT:MMF 2e-3
‘
‘ Set scale factor (M) to 2e-3.
CALC1:KMAT:MBF 5e-4
‘ Set offset (B) to 5e-4.
CALC1:STAT ON
‘ Enable CALC1 (math).
CALC1:DATA?
‘ Request latest CALC1 reading
NOTE Data (reading) flow from the Model 2182/2182A to the
buffer of the Model 622x is explained in
“Data flow,” on
page 5-13 and illustrated in Figure 5-6 .
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