UNI-T UTS3000B/A Series User Manual page 48

Demod: Set the demodulation type to "AM" or "FM" or turn off the demodulation function. The default is
"Off".
1. When AM (or FM) demodulation is turned on, the system will automatically turn on a cursor, locate it to
the center frequency, and perform AM (or FM) demodulation for that frequency point.
2. The machine is equipped with headphone jack, which can output the demodulation signal in audio
mode through headphone. The audio frequency indicates the frequency of the modulating signal, and
the audio strength indicates the amplitude of the modulating signal.
Trigger Type: Freedom trigger, external trigger and video trigger
1. Free Run: The trigger signal can be generated continuously at any time as long as the trigger
conditions are met. No need to set trigger condition, after sweep each frame will sweep the next frame
automatically.
2. Video: When the voltage of the detected video signal exceeds the setup video trigger level, a trigger
signal is generated.
Trigger Level: When the video trigger is selected, the trigger level line and the value of trigger level
are displayed on the screen. User can change the trigger level by using the numeric key, rotary knob,
direction key or touch panel menu.
3. External: Input an external signal via connector【TRIGGER IN】 on the rear panel, a trigger signal is
generated when the signal meets the trigger edge conditions.
Trigger Edge （Rising/Falling） : Set the trigger edge for external trigger to be the rising or falling edge
of the pulse, a trigger signal is generated when the signal meets the trigger edge conditions.
Trigger Delay: Set trigger delay time
Trace
Press [Trace] key to enter menu which can select and control trace information and detector. Each
trace consists of a series of data points with amplitude information. With each sweeping, the
spectrum analyzer will refresh information for every valid trace.
Select Trace: Select the required trace, there are 6 traces.
Trace Type: Set the type of the current selected trace. The system will display the scan data after taking
the corresponding calculation method according to the selected trace type. The trace types include
refresh, trace averaging, maximum hold, and minimum hold. Each type has a corresponding parameter
on the upper right side of the screen.
1. Clear/Write
Take the real-time data after sweeping of each point of the trace.
2. Average
Each point of the trace displays the result of averaging the data after multiple sweeps. As the time of
average sweep increases, the waveform becomes smoother.
3. Max Hold
Each point of the trace keeps displaying the maximum value in multiple sweeps, and updates the data
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