Keysight Technologies N5171B EXG, Руководство пользователя

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244 Keysight EXG and MXG X-Series Signal Generators User’s Guide
Basic Digital Operation (Option 653/655/656/657)
Setting the Baseband Frequency Offset
Figure 9-14 Dual ARB DAC Over–Range Protection Softkey Location
In the Dual ARB Player, to avoid excessive scaling or to just perform scaling manually, turn the
feature off and use the Waveform Runtime Scaling softkey to eliminate DAC over–range
conditions.
For details on each key, use key help
as described on
page 40
.
Default setting is On. Available only
when Phase Noise or AWGN are on
(see
page 349
), or when the
baseband frequency offset is set to a
value other than zero.
Turn off when you want to manually
control scaling while using the
baseband frequency offset feature.
Manually adjust the scaling using the
Waveform Runtime Scaling softkey
above.
Enables or disables the automatic
internal scaling used to keep DAC
over-range errors from occuring with
the Phase Noise, AWGN and
Frequency Offset features. This
automatic scaling can be excessive
(particularly for a constant amplitude
signal) and thus reduce the dynamic
range more than is necessary.
When the protection is disabled, no
automatic scaling occurs, so the
Runtime Scaling feature must be
used to adjust for the highest scaling
value that does not cause DAC
overranges.
Since the over-range protection
works with only three features, this
key grays out until one of the three
features is active even when the
protection is on.
When the DAC over–range protection is off,
eliminate over–range conditions by
decreasing the scaling value (see
“Setting
Waveform Runtime Scaling” on
page 238
).
page 265