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SECTION 3
Operation
situations where the output (both waveform
and DC off-
set) is relatively
constant, or when a large DC offset is
added to a waveform with a small amplitude. FXD is also
a better choice in situations
where output
values are
changed from 0 to full scale at equal increments.
The relation between setting resolution
and number of
digits when the output is AC only (when the DC offset is
0 volts), and when the output
is DC only (when the
waveform
is DC) in AIJTO/FXD
output range modes is
given in Figure 3-15. Figure 3-16 shows the setting reso-
lution and number of digits for DC output values alone.
Output Range Mode Setting
Pressing SHIFT 0 displays the current outputrange
mode
setting and allows the mode to be set as desired. The two
output range modes are: AUTO (0) and FXD (1). You can
select the desired mode either by pressing the appropri-
ate numeric key (0 or 11, or by rotating the MODIFY knob.
Note that the amplitude
and DC offset setting ranges
vary between the two modes, and that the amplitude
and
offset values for each output range mode are independ-
ently set and saved. Also, the waveform
output is mo-
mentarily
turned
off when the output
range mode is
changed.
Memory
Recall Operation
The output range mode and respective amplitude
and
DC offset values can also be stored in memory, but when
settings are recalled from memory, operation differs de-
pending on the present and recalled output range modes.
When the unit is presently in the ALTO mode, the output
is temporarily
turned off, settings stored in rnemo~, are
recalled, and the output is turned on again after sethngs
are recalled. However,
if the unit is currently
in the
AUTO mode, and the recalled settings include the AUTO
mode, the output waveform will be interrupted
by the re-
call process only if the frequency changes during mem-
ory recall.
If the Model 3930A is currently in the FXD mode, and the
recalled settings include the FXD mode, the output signal
is not interrupted
by memory
recall except when a
waveform or AM on/off change occurs, in which case the
waveform
output is momentarily
turned off during the
recall process.
When the output range mode changes as a result of mem-
ory recall (AUTO
to FXD, or FXD to ALTO),
the
waveform
output is always temporarily
turned off re-
gardless of other parameter settings.
3-35
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