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Ryan Griggs
Ryan Griggs
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Noob oscilloscope user here.

I want to view the voltage rise on my oscilloscope when I connect a device to a 31.3VDC5VDC power source, to see how clean the connection is - i.e. how many times the voltage bounces on/off/brownout/etc before stabilizing.

I set the scope trigger to about 100mV200mV, and the input to DC coupling. Measure depth is set to 10M samples at 10MS/sec sample rate. Trigger: single, rising edge. Holdoff is set to minimum value possible (100ns). There is no option to disable holdoff that I can see.

The scope triggers and captures the signal, but there is no rise. It is immediately captured at 31.3V5V with no rising edge.

I assume since the voltage stays above the trigger level after the initial rising edge, it continues sampling until reaching the end of sample memory, which is 10M samples at 10Ms/sec = 1 sec. So I'm seeing a 1-second-long 31.3v5v flat DC.

Is there a way to define the length of pre-trigger data to capture? Also I'm confused as to why I don't see a rising edge, since the trigger level is set to only 100mV200mV.

Thanks for any suggestions or explanations.

Here's a screenshot: Screenshot1

Noob oscilloscope user here.

I want to view the voltage rise on my oscilloscope when I connect a device to a 3.3VDC power source, to see how clean the connection is - i.e. how many times the voltage bounces on/off/brownout/etc before stabilizing.

I set the scope trigger to about 100mV, and the input to DC coupling. Measure depth is set to 10M samples at 10MS/sec sample rate. Trigger: single, rising edge. Holdoff is set to minimum value possible (100ns). There is no option to disable holdoff that I can see.

The scope triggers and captures the signal, but there is no rise. It is immediately captured at 3.3V with no rising edge.

I assume since the voltage stays above the trigger level after the initial rising edge, it continues sampling until reaching the end of sample memory, which is 10M samples at 10Ms/sec = 1 sec. So I'm seeing a 1-second-long 3.3v flat DC.

Is there a way to define the length of pre-trigger data to capture? Also I'm confused as to why I don't see a rising edge, since the trigger level is set to only 100mV.

Thanks for any suggestions or explanations.

Noob oscilloscope user here.

I want to view the voltage rise on my oscilloscope when I connect a device to a 1.5VDC power source, to see how clean the connection is - i.e. how many times the voltage bounces on/off/brownout/etc before stabilizing.

I set the scope trigger to about 200mV, and the input to DC coupling. Measure depth is set to 10M samples at 10MS/sec sample rate. Trigger: single, rising edge. Holdoff is set to minimum value possible (100ns). There is no option to disable holdoff that I can see.

The scope triggers and captures the signal, but there is no rise. It is immediately captured at 1.5V with no rising edge.

I assume since the voltage stays above the trigger level after the initial rising edge, it continues sampling until reaching the end of sample memory, which is 10M samples at 10Ms/sec = 1 sec. So I'm seeing a 1-second-long 1.5v flat DC.

Is there a way to define the length of pre-trigger data to capture? Also I'm confused as to why I don't see a rising edge, since the trigger level is set to only 200mV.

Thanks for any suggestions or explanations.

Here's a screenshot: Screenshot1

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Ryan Griggs
Ryan Griggs
  • 2.7k
  • 2
  • 34
  • 56

How to view pre-trigger data on digital scope (Owon SDS-7102)

Noob oscilloscope user here.

I want to view the voltage rise on my oscilloscope when I connect a device to a 3.3VDC power source, to see how clean the connection is - i.e. how many times the voltage bounces on/off/brownout/etc before stabilizing.

I set the scope trigger to about 100mV, and the input to DC coupling. Measure depth is set to 10M samples at 10MS/sec sample rate. Trigger: single, rising edge. Holdoff is set to minimum value possible (100ns). There is no option to disable holdoff that I can see.

The scope triggers and captures the signal, but there is no rise. It is immediately captured at 3.3V with no rising edge.

I assume since the voltage stays above the trigger level after the initial rising edge, it continues sampling until reaching the end of sample memory, which is 10M samples at 10Ms/sec = 1 sec. So I'm seeing a 1-second-long 3.3v flat DC.

Is there a way to define the length of pre-trigger data to capture? Also I'm confused as to why I don't see a rising edge, since the trigger level is set to only 100mV.

Thanks for any suggestions or explanations.