UNI-T UTS3000B/A Series User Manual page 46

RBW Filter Type: The UTS3000B/A series supports two types of filters, Gaussian and flat top window.

Gaussian window is a kind of exponential window. The main flap is wide, so the frequency
resolution is low; no negative side flap, the first side flap attenuated to 55Db. Gaussian window is
often used to truncate some non-periodic signals, such as exponential decay signal.

The flat top window behaves in the frequency domain with very small passband fluctuations as its
name suggests.
Auto
Press [Auto] key to enable auto tune function to check input signal, the steps as follows,
1. Performing peak search in full span
2. Operating Marker>Center Frequency
3. Operating Marker >Reference level
4. Set the sweep span to 1MHz, other setting is for observing signals.
Note
Valid frequency range of auto tune is 10MHz to 3GHz. It can automatically detect the minimum amplitude
of the signal at -65dBm.
Sweep
Press [Sweep] key to enter the following panel menu to select the sweep and trigger mode.
Sweep Time（Auto/Man）: Select the sweep time of display sweep span (or the time used by the
spectrum analyzer for the full screen scan when the sweep span is zero). Decreasing the sweep time will
increase the sweep frequency. In manual mode, user can change the sweep time value by using the
numeric key, rotary knob, direction key or touch panel menu.
1. Sweep span is not zero:
When the sweep time is auto, the spectrum analyzer selects an optimal (minimum) sweep time for the
current setting. This selection is influenced by the following factors.
1. The maximum tuning frequency of the spectrum analyzer
2. The selected video bandwidth filter and resolution
3. The maximum sampling rate of the analog-digital converter
4. Sweeping Points
5. Scale of the amplitude (logarithmic or linear)
6. Mode of the detector
User can select a sweep time that is less than the auto-coupling value; however, this may cause some
measurement errors. The minimum sweep time is 1ms.
2. Sweep span is zero:
The minimum sweep time is determined by the maximum sampling rate of the analog-digital converter
and the sweeping points.
The minimum sweep time is 1us. The maximum scan time is 4000s.
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