BNC 645 - Manual (Page 148)

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• The Revision code contains four numbers separated by dashes.
Firmware revision number-Book kernel revision number-ASIC revision number-Printed
circuit board revision number
-- L --
*LRN?
Query the waveform generator and return a string of SCPI commands
containing the current settings (learn string). You can then send the string back
to the instrument to restore this state at a later time. For proper operation, do
not modify the string before sending it back to the waveform generator. The
string should contain about 1,500 characters. To avoid possible instrument
errors, execute the *EST command first, and then send the string back to the
waveform generator.
-- M --
MARKer {OFF︱ON}
Disable or enable the frequency marker. The default is OFF. When the frequency
marker is off, the signal output from the Sync connector is the normal Sync
signal for the carrier waveform.
The OUTP:SYNC command is overridden by the setting of the MARK command,
so when the marker frequency is turned on ( and the sweep mode is also turned
on), the OUTP:SYNC command is ignored.
MARKer?
“0” or “1” indicating the enable state of the frequency marker will be returned.
MARKer:FREQuency {<frequency>︱MINimum︱MAXimum}
Specify the marker frequency. The signal on the front-panel Sync connector
goes to a logic low at the marker frequency during the sweep. The range is from
1μHz to 200 MHz (limited to 200 kHz for ramps and 10MHz for arbitrary
waveforms) and the default is 500 Hz. The minimum value is the lower one of
the start and stop frequencies and the maximum value is the higher one of the
start and stop frequencies.