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281, 282, 284
Users Manual
Introduction
In Tone mode the output is stepped through a user-defined list of up to 16 frequencies
under the control of the signal set by the source soft-key on the TRIGGER IN
set-up screen. This signal can be the internal trigger generator, an external trigger input,
the front panel MAN TRIG key or a remote command. On multi-channel instruments the
control signal can also be the trigger out from an adjacent channel.
All standard and arbitrary waveforms can be used in tone mode with the exception of
pulse, pulse-train and sequence. During tone mode all waveforms are generated in DDS
mode for fast phase-continuous switching between frequencies. For DDS operation all
waveforms must be 4096 points in length; this is the natural length for standard
waveforms but all arbitrary waveforms are expanded or condensed in software to 4096
points when the tone list is built. This does not affect the original data.
Because DDS mode is used the frequency range for all waveforms is 1 mHz to 10 MHz
in tone mode, including triangle, ramp and square wave, which have different limits in
continuous operation.
Tone Frequency
Press the tone setup… soft-key on the MODE screen, called by pressing the
MODE key. The TONE set-up screen will be displayed:
TONE type: trig
2.000000 kHz #2
3.000000 kHz del
end of list #4
Each frequency in the list can be changed by pressing the appropriate soft-key and
entering the new value from the keyboard. The selected frequency can be deleted from
the list by pressing the del (delete) soft-key. Additional frequencies can be added to
the end of the list by selecting end of list with the appropriate soft-key and
entering the new frequency from the keyboard.
The whole list can be scrolled back and forward through the display using the rotary
control.
Tone Type
The type soft-key on the TONE set-up screen permits three types of tone switching
to be specified.
With type set to trig the frequency changes after each occurrence of the signal
edge specified in the source and slope fields on the TRIGGER IN screen, but
only after completing the last cycle of the current frequency.
With type set to gate the frequency changes when the signal specified in the
source field goes to the level specified in the slope field on the TRIGGER IN
screen and continues until the level changes again, at which point the current cycle is
completed. The output is then gated off until the next occurrence of the gating signal, at
which point the next frequency in the list is gated on.
8-2
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