BNC 645 - Manual (Page 137)

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state (DISP OFF command). The allowed message can be up to 12 characters in
a large font and more characters in a small font; Any additional characters will
be truncated.
With a message diaplaying on the front-panel display, information relating to
the output waveform such as frequency is not shown on the display.
DISPlay:TEXT?
Query the message sent to the front panel display.
DISPlay:TEXT:CLEar
Clear the message shown on the front panel display.
If the display is currently enabled, this command will clear the message on the
front-panel display and return the normal front-panel display mode.
If the display is currently disabled, this command will clear the message on the
display, but the display remains off.
-- F --
FM:INTernal:FUNCtion
{SINusoid|SQUare|RAMP|NRAMP|TRIangle|NOISe|USER}
Specify the shape of the modulating waveform. This applies only when the
modulation source is Internal (FM:SOUR INT command). Noise can be a
modulating waveform, but cannot be used as a carrier waveform, neither do
Pulse nor dc. The default modulating waveform is a sine waveform.
FM:INTernal:FUNCtion?
Query the modulating function used in frequency modulation. “SIN”, “SQU”,
“RAMP”, “NRAM”, “TRI”, “NOIS” or ”USER” string indicating the modulating
function will be returned.
-- Square waveform has 50% duty cycle.
--Ramp waveform has 100% symmetry
--Triangle waveform has 50% symmetry.
--Negative Ramp waveform has 0% symmetry.
--If an Arbitrary(USER) waveform is chosen to be the modulating waveform, it is
automatically limited to 4k points. Extra points are removed using decimation.