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Introduction to Waveform

Search Function

In general, when implementing circuits designing and debugging,

engineers usually need to observe long streaming waveform. Digital

oscilloscope is usually the appropriate tool of observation. As the record

length of digital oscilloscope becomes deeper and deeper, capturing,

measuring and observing longer waveform data at single shot

acquisition become the biggest challenge during circuit testing.

It is time-consuming for searching the problems caused by circuit

interference because the infrequently appeared signals had taken place

under certain circumstances while continuously observing periodic or

random digital signals. However, the Waveform Search Function of

GDS-2000A can successfully solve the concerning issue.

After sending periodic or random signals into GDS-2000A

oscilloscope, then users can firstly press the “Search” button at the

upper-right hand side on the screen, then choose which type of trigger

condition and set threshold voltage according to their measurement.

Subsequently, the markers corresponding to trigger condition will

appear on the top of the screen. Then, the users can press the left/right

arrow button to search the events of interest.

Thus, the users can also select “Save All Markers” function at the

right-hand side of screen during circuit debugging. The markers will be

shown in white to indicate recorded positions. Engineers can repeatedly

compare the different waveforms captured by different triggering

conditions with one another, please refer to Figure 1.

Summary of content (6 pages)

PAGE 1
Introduction to Waveform Search Function In general, when implementing circuits designing and debugging, engineers usually need to observe long streaming waveform. Digital oscilloscope is usually the appropriate tool of observation. As the record length of digital oscilloscope becomes deeper and deeper, capturing, measuring and observing longer waveform data at single shot acquisition become the biggest challenge during circuit testing.
PAGE 2
Figure.1 The ”Markers” of Waveform Search Function Figure.2 Waveform Search + Play Function Collaborating with “Play” function, Waveform Search Function facilitates the identification of problems within the long memory depth and enhances the working efficiency of engineers. Please refer to Figure 2. Press the “ZOOM” button, and then press “Play” button to display the on-going (recorded) waveform, the problems can be found at the correspondent window.
PAGE 3
Standard Demo Procedure of Waveform Search Function Equipment: 1. GDS-2000A Digital Storage Oscilloscope * 1 2. GDS-03 Demo Board *1 3. Passive Probe *1 Demo Procedures: 1. Set the appropriate ground by connecting the passive probe between the first channel of DSO GDS-2000A and the CH1 terminal of GDS-03 Demo board. GDB-03 CH1 connect point Grounding 2.
PAGE 4
Adjust the knob 3. Press the “Default” button at the upper-right hand sided on the oscilloscope, then press the “Autoset” to adjust the horizontal time , Time/Div, to 2us/div . 4. Modify the knob of triggering level to above 600mV to maintain the stability of the displayed waveform.
PAGE 5
. Press “Search” button, then turn on the Search function at the bottom-left sided on the screen to maintain the Edge triggering mode. Turn on the Search function 6. Set the threshold voltage of the Search Function. The markers fulfilled triggering conditions will appear on the top of the screen according to different threshold voltage level.
PAGE 6
7. The markers will turn into solid white triangle after pressing “Save All Markers” at the upper-right hand sided of the screen. When the oscilloscope recaptures the waveforms, users can compare waveforms of different triggering conditions with one another. Solid white Markers Press “Save All Markers” 8. Using Right/Left arrow key to search the events of interest. 9. Using “Zoom”, “Play/Pause” to search waveforms with efficiency.