6-12 Averaging Filter, Math, and Buffer Model 6220/6221 Reference Manual
Return to Section 6 topics
Buffer characteristics
Buffer size
The buffer size automatically sets to accommodate the number delta readings to
be performed. For example, if the test is configured to perform 1,000 delta mea-
surements, the buffer size will be set to 1000.
If the delta test is configured to perform an infinite number of delta measurements,
the buffer will be set to maximum size (65,536 readings). After the 65,536th read-
ing, the delta test continues but readings stop being stored.
The buffer size can be changed using remote programming. Buffer commands
are documented in Table 6-4. The following command demonstrates proper syn-
tax to set buffer size.
Example – Configure buffer to store 500 delta readings:
Buffer data elements
Data elements are stored along with each delta reading. The data elements for
front panel operation are shown in Figure 6-3. These include reading number,
timestamp, reading units, and the current source output value.
For remote programming, the returned reading string for a buffer read command
includes the reading and the data elements in the following order:
Reading with Units, Timestamp, Current Source, Average Voltage, Compliance
State, and Reading Number.
Buffer statistics
The following statistics are available on the stored buffer readings:
• MIN and MAX provides the minimum and maximum readings stored in the
buffer. It also indicates the buffer location of these readings.
•The PK-PK (peak-to-peak) value is the difference between the maximum
and minimum readings stored in the buffer:
PK-PK = MAX - MIN
TRACe:POINts 500 ‘ Set buffer size to 500.
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