4 Features and Functions
122 Keysight 34970A/34972A User’s Guide
Viewing readings stored in memory
During a scan, the instrument automatically adds a time stamp to all readings and
stores them in non-volatile memory. Readings are stored only during a scan. You
can read the contents of memory at any time, even during a scan.
– You can store up to 50,000 readings in non-volatile memory during a scan.
From the front panel, you can view the last 100 readings and all of the readings
are available from the remote interface. If memory overflows (the MEM
annunciator will turn on), a status register bit is set and new readings will
overwrite the first 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 in memory after a Factory Reset (*RST
command) or Instrument Preset (SYSTem:PRESet command). Reading
memory is not cleared when you read it.
– 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). For more information, see
“Reading Format” on page 118.
– 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 MEASure? and READ? commands send readings directly to the
instrument’s output buffer but readings are not stored in memory. You will not
be able to view these readings.
–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).
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