Symmetry can only be varied for squarewave and pulse waveforms; selecting
SYMMETRY
for
any other waveform will cause the error message
Symmetry has no effect on this
wave
to be displayed before the
SYMMETRY
screen is shown.
For squarewave and pulse waveforms the symmetry can be set between 20% and 80%
(mark:space). 20%, 30%, etc. can be set directly with the appropriate soft-key or any in-range
value can be set with a 1% resolution by direct numeric entry or by using the rotary control.
AUX Output
AUX OUT is a multifunction CMOS/TTL level output that can be automatically or manually set to
be any of the following:
•
waveform sync
:
A sync signal phase coincident with the MAIN OUT waveform. For sine
and triangle waves the sync waveform rising edge is at the 0º phase
point of MAIN OUT and the falling edge is at the 180º phase point. For
square waves and pulses both phase and symmetry are coincident with
MAIN OUT.
•
trigger
:
Outputs a replica of the current trigger signal, i.e. the trigger source
selected on the TRIG/GATE SETUP screen.
•
sweep sync
:
Outputs the sweep trigger and marker signals.
The setting up of the signals themselves is discussed in the relevant sections later in this manual.
Pressing the AUX OUT key calls the
AUX OUT
setup
screen.
AUX OUT
output: on
◊
mode: auto
◊
srce: waveform sync
AUX OUT is turned on and off by alternate presses of the
output
soft
−
key.
The selection of the signal to be output from the AUX OUT socket is made using the
srce
(source) soft
−
key; repeated presses of
srce
cycle the selection through the choices
(
waveform sync
,
etc.) listed above. Alternatively, with the
srce
selected (double
−
headed
arrow) the rotary control or cursor keys can be used to step backwards and forwards through the
choices.
The source selection of the AUX OUT waveform can be made automatic (
auto
) or user
−
defined
(
manual
) with alternate presses of the
mode
soft
−
key. In automatic mode the AUX OUT
waveform most appropriate for the current main waveform is selected.
For example,
waveform sync
is automatically selected for continuous waveforms but
trigger
is selected in gated waveform mode.
The automatic selection can still be changed manually by the
srce
soft
−
key even when
auto
mode has been selected but the selection will revert to the automatic choice if the mode is
changed.
Manual
must be selected by the
mode
soft
−
key for a source other than the
automatic choice to remain set. The
auto
selection will generally set the most frequently used
signal, e.g.
waveform
sync
for all continuous main waveforms.
18
