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<Internal Sweep> The internal reference signal sweep. In this mode, the signal generator will conduct internal
sweep according to the parameters set by users. As is shown in Fig.19, <Sweep> can be set.
3.2.3 < Ref. slope>: Setting the External Signal Mode
When <External> is chosen in <Ref. source>, this setting can access. Choose the corresponding signal type
according to the actual external reference signal.
<TTL>
Choose TTL when the external reference signal is a square wave.
<Sine>
Choose Sine when the external reference signal is a sine wave.
If the external reference signal is TTL logic, choose <TTL>. Pay attention that, even if the REFIN is a square wave,
it may still obtain an unsteady trigger because the level does not satisfy the threshold condition of the TTL logic.
Thus, it is beneficial to choose <Sine> to trigger. Moreover, choose TTL signal if the signal frequency is very low
(<1Hz).
If the input reference signal is sine wave, choose SINE to trigger. In this mode, the instrument will do precision
truing for the REF IN input and then detect the frequency and phase information.
Otherwise, the system has no requirement on the signal duty cycle no matter what the trigger way is. It is kind to
use common 50% duty cycle.
3.2.4 < Ref. frequency>: Setting the Internal Reference Frequency
When <Ref. source> is in <Internal>, this setting can access. The frequency range is from 1mHz to 100 kHz and
1.000 kHz in default. Frequency settings can input from keyboard. The minimum frequency resolution is 1mHz.
3.2.5 < Sweep>: Setting the Internal Reference Signal Sweep
When <Ref. source> is in <Internal Sweep >, this setting can access. Press the <Sweep> in choose interface can
access the submenu. In the submenu, users can set the function of <Sweep Type>, <Sweep Set> and <Sweep Run>,
as is shown in Fig.20.
Fig.20 <Sweep> Secondary Submenu
