In this section:
Introduction .............................................................................. 8-1
Buffer overview ........................................................................ 8-1
Configuring data storage .......................................................... 8-3
Introduction
This section discusses the buffer (data store), which can be used to store a number of readings. The
following paragraphs discuss configuration of the buffer as well as recalling buffered data.
Buffer overview
Maximum readings
The Keithley Instruments Model 6517B Electrometer has a buffer to store up to 50,000 data readings.
For compatibility with the 6517A, the maximum buffer data points available when using the
:TRACe:POINts MAX command vary with the reading elements stored as shown in the table in Data
elements (on page 8-1). The Model 6517B always allows 50,000 to be specified when using this
command regardless of what elements are stored. The number of data points can be set using the
front panel.
Data elements
The basic data elements include the reading, units, reading# and status (overflow or underflow). The
reading# indicates the location of the reading in the buffer. In addition to these items, recalled data
also includes statistical information, such as minimum, maximum, average, and standard deviation,
which are part of the NEXT displays).
Optional data elements include time stamp, humidity, external temperature and channel number (for
scanning). When selected, the time stamp is available on the primary display along with the reading.
If a scan was performed, the channel number is also displayed along with the reading if it was
selected as a data element. Humidity and external temperature are available as a NEXT display.
Section 8
Buffer (data store)
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