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UTD1000L User Manual 57
to pulse width time when the menu is displayed.
Threshold
Low
High
Low&High
Use Up and Down buttons to move low-level threshold
Use Up and Down buttons to move High-level threshold
Use Up and Down buttons to move low-and high-level
thresholds.
Back
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To return to Page 1 of Slope Menu.
Term Explanation
1. Trigger Source: Input channel is used as the trigger source
■ Input Channel: Input channel (CHI) is the most commonly used trigger source. For the
channel selected as the trigger source, it should be switched on before it works normally.
2. Trigger Mode: decide what the oscilloscope will do when no trigger event occurs. Three
trigger modes are offered: Auto, Normal and Single.
■ Auto: The system automatically acquires data even there is no signal input and therefore
displays scan reference line on the screen; when the trigger occurs, it converted into trigger
scanning and synchronizes with the signal on its own.
Note: The Oscilloscope will go into SCAN mode if waveform scan rate is set at 50ms/div or
lower timebase.
■ Normal: Under this mode, the Oscilloscope acquires the waveform only after the trigger
conditions are met. It stops to acquire and keeps waiting if no signal is input. Once the trigger
occurs, the scan starts.
■ Single: You just need to press RUN button if under single mode, then the Oscilloscope waits
to trigger. It begins to acquire and display all acquired waveforms once single-shot trigger
signal is detected, after that, it stops.
3. Trigger Coupling: To decide to pass which kind of components through the trigger circuits.
The types include: DC, AC and Hf Reject.
■DC: passes through all components of the signal
■ AC: blocks DC component and attenuate signals at ＜10Hz
■HF Reject: attenuates high frequency component at ＞80kHz
4. Pretrigger/Delay Trigger: Capture data before /after the trigger event.The trigger is usually
located at the horizontal center point on the screen, for example, you can observe 6div
pretriger and delay information, adjusting the waveform horizontally can let you view on more
pretrigger information. Pretrigger can indicate what the waveform is like before the trigger
event. So this function can make it easy, for instance, to find out the cause of glitches in start
moment of circuits through observing and analyzing pretrigger data.
6.5 Setting Acquisition Mode
Press ACQUIRE button to access acquisition mode, see the following table:
Table 6-8
Menu Settings Description
Mode
Normal
Peak Detect
AVG
Set to normal sampling
Set to Peak Detect mode,
Set to AVG sampling mode
AVG Number
(only displayed under
AVG mode)
2~256 To set AVG times, stepping in multiples of two,
that is from 2, 4, 8, 16, 32, 64, 128, 256 to 512,
turn Left and Right arrow buttons to change
average times in displayed menu.
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