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58 34980A User’s Guide
2 Features and Functions
• The scan order setting is stored in volatile memory and the ordered
mode will be enabled when power is turned off or after a Factory Reset
(
*RST command).
Remote Interface Operation: ROUTe:SCAN:ORDered {OFF|ON}
Viewing Readings Stored in Memory
• During a scan, the instrument automatically adds a time stamp to all
readings and stores them in memory. You can read the contents of
memory at any time, even during a scan. Reading memory is not
cleared when you read it.
• You can store at least 500,000 readings in memory and all readings are
automatically time stamped. If memory overflows, a status register bit
is set and new readings will overwrite the first (oldest) readings stored.
The most recent readings are always preserved.
• Each time you start a new scan, the instrument clears all readings
(including alarm data) stored in reading memory from the previous
scan. Therefore, the contents of memory are always from the most
recent scan.
• The instrument clears all readings from memory after a Factory Reset
(
*RST command), after an Instrument Preset (SYSTem:PRESet
command), or when mainframe power is cycled.
• The instrument clears all readings from memory when a new scan is
initiated, when any measurement parameters are changed (
CONFigure
and
SENSe commands), and when the triggering configuration is
changed (TRIGger commands).
• While a scan is running, the instrument automatically stores the
minimum and maximum readings and calculates the average for each
channel. You can read these values at any time, even during a scan.
• Each reading is stored with measurement units, time stamp, channel
number, and alarm status information. From the remote interface,
you can specify which information you want returned with the readings
(from the front panel, all of the information is available for viewing).
See “Reading Format” on page 56 for more information.
• Readings acquired during a Monitor are not stored in memory
(however, all readings from a scan in progress at the same time are
stored in memory).
• The
INITiate command stores readings in memory. Use the FETCh?
command to retrieve stored readings from memory (the readings are
not erased when you read them).