Why can't I see bouncing of switch on oscilloscope screen?Can't observe DC offset in a simple RC circuit with...
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Why can't I see bouncing of switch on oscilloscope screen?
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$begingroup$
I'm trying to view bouncing of a simple switch on the oscilloscope. I have prepared a simple breadboard circuit (power->switch->resistor->ground). The problem is, it is displayed as perfect square/rectangle on the scope. I have attached a photo of scope screen and circuit. Please help me to identify why I can't catch bouncing of the switch on the scope. I don't think it this is a non-bouncing switch.
Edit: I have added a 3rd photo showing zoomed in time scale, 50uSec. As you can see it is rising 0 to 9v within 150uSec and staying there. I have tried a few different switches. Resistor in the picture is 220ohm 0.5w resistor.
switches oscilloscope debounce
asked 1 hour ago
DenizDeniz
1113
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
|
show 10 more comments
$begingroup$
I'm trying to view bouncing of a simple switch on the oscilloscope. I have prepared a simple breadboard circuit (power->switch->resistor->ground). The problem is, it is displayed as perfect square/rectangle on the scope. I have attached a photo of scope screen and circuit. Please help me to identify why I can't catch bouncing of the switch on the scope. I don't think it this is a non-bouncing switch.
Edit: I have added a 3rd photo showing zoomed in time scale, 50uSec. As you can see it is rising 0 to 9v within 150uSec and staying there. I have tried a few different switches. Resistor in the picture is 220ohm 0.5w resistor.
switches oscilloscope debounce
asked 1 hour ago
DenizDeniz
1113
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
6
$begingroup$
Have you tried adjusting the time base / horizontal scale?
$endgroup$
– NMF
1 hour ago
$begingroup$
Yeah, zoom in farther. Although, I must say that switches typically bounce for 1-10ms, and that should be visible on the OP's 50ms/div timescale. That's surprisingly clean switch.
$endgroup$
– Toor
1 hour ago
1
$begingroup$
If you don't succeed on the first try, try again.
$endgroup$
– StainlessSteelRat
1 hour ago
2
$begingroup$
I have a hard time believing that your zoomed in version is actually a new trig. Nothing would look like that except the scope's internal interpolation. An clean break with an RC-filter created by the scope would show an exponential clean rise - nothing linear. I bet that you just zoomed in on the stored waveform.
$endgroup$
– pipe
29 mins ago
1
$begingroup$
My zoomed photo is from another capture with battery instead of power supply. But as @pipe sait I have captured on zoomed out view and then zoomed on the rising edge after that. Now I understand that changing time scale before the capture and after the capture is different things? I didn't know that. I will need to figure out how to capture when time scale is set to uSec range.
$endgroup$
– Deniz
21 mins ago
|
show 10 more comments
$begingroup$
I'm trying to view bouncing of a simple switch on the oscilloscope. I have prepared a simple breadboard circuit (power->switch->resistor->ground). The problem is, it is displayed as perfect square/rectangle on the scope. I have attached a photo of scope screen and circuit. Please help me to identify why I can't catch bouncing of the switch on the scope. I don't think it this is a non-bouncing switch.
Edit: I have added a 3rd photo showing zoomed in time scale, 50uSec. As you can see it is rising 0 to 9v within 150uSec and staying there. I have tried a few different switches. Resistor in the picture is 220ohm 0.5w resistor.
switches oscilloscope debounce
asked 1 hour ago
DenizDeniz
1113
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
I'm trying to view bouncing of a simple switch on the oscilloscope. I have prepared a simple breadboard circuit (power->switch->resistor->ground). The problem is, it is displayed as perfect square/rectangle on the scope. I have attached a photo of scope screen and circuit. Please help me to identify why I can't catch bouncing of the switch on the scope. I don't think it this is a non-bouncing switch.
Edit: I have added a 3rd photo showing zoomed in time scale, 50uSec. As you can see it is rising 0 to 9v within 150uSec and staying there. I have tried a few different switches. Resistor in the picture is 220ohm 0.5w resistor.
switches oscilloscope debounce
switches oscilloscope debounce
asked 1 hour ago
DenizDeniz
1113
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
DenizDeniz
1113
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 38 mins ago
Deniz
asked 1 hour ago
DenizDeniz
1113
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
DenizDeniz
1113
asked 1 hour ago
DenizDeniz
1113
1113
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
6
$begingroup$
Have you tried adjusting the time base / horizontal scale?
$endgroup$
– NMF
1 hour ago
$begingroup$
Yeah, zoom in farther. Although, I must say that switches typically bounce for 1-10ms, and that should be visible on the OP's 50ms/div timescale. That's surprisingly clean switch.
$endgroup$
– Toor
1 hour ago
1
$begingroup$
If you don't succeed on the first try, try again.
$endgroup$
– StainlessSteelRat
1 hour ago
2
$begingroup$
I have a hard time believing that your zoomed in version is actually a new trig. Nothing would look like that except the scope's internal interpolation. An clean break with an RC-filter created by the scope would show an exponential clean rise - nothing linear. I bet that you just zoomed in on the stored waveform.
$endgroup$
– pipe
29 mins ago
1
$begingroup$
My zoomed photo is from another capture with battery instead of power supply. But as @pipe sait I have captured on zoomed out view and then zoomed on the rising edge after that. Now I understand that changing time scale before the capture and after the capture is different things? I didn't know that. I will need to figure out how to capture when time scale is set to uSec range.
$endgroup$
– Deniz
21 mins ago
|
show 10 more comments
6
$begingroup$
Have you tried adjusting the time base / horizontal scale?
$endgroup$
– NMF
1 hour ago
$begingroup$
Yeah, zoom in farther. Although, I must say that switches typically bounce for 1-10ms, and that should be visible on the OP's 50ms/div timescale. That's surprisingly clean switch.
$endgroup$
– Toor
1 hour ago
1
$begingroup$
If you don't succeed on the first try, try again.
$endgroup$
– StainlessSteelRat
1 hour ago
2
$begingroup$
I have a hard time believing that your zoomed in version is actually a new trig. Nothing would look like that except the scope's internal interpolation. An clean break with an RC-filter created by the scope would show an exponential clean rise - nothing linear. I bet that you just zoomed in on the stored waveform.
$endgroup$
– pipe
29 mins ago
1
$begingroup$
My zoomed photo is from another capture with battery instead of power supply. But as @pipe sait I have captured on zoomed out view and then zoomed on the rising edge after that. Now I understand that changing time scale before the capture and after the capture is different things? I didn't know that. I will need to figure out how to capture when time scale is set to uSec range.
$endgroup$
– Deniz
21 mins ago
6
6
$begingroup$
Have you tried adjusting the time base / horizontal scale?
$endgroup$
– NMF
1 hour ago
$begingroup$
Have you tried adjusting the time base / horizontal scale?
$endgroup$
– NMF
1 hour ago
$begingroup$
Yeah, zoom in farther. Although, I must say that switches typically bounce for 1-10ms, and that should be visible on the OP's 50ms/div timescale. That's surprisingly clean switch.
$endgroup$
– Toor
1 hour ago
$begingroup$
Yeah, zoom in farther. Although, I must say that switches typically bounce for 1-10ms, and that should be visible on the OP's 50ms/div timescale. That's surprisingly clean switch.
$endgroup$
– Toor
1 hour ago
1
1
$begingroup$
If you don't succeed on the first try, try again.
$endgroup$
– StainlessSteelRat
1 hour ago
$begingroup$
If you don't succeed on the first try, try again.
$endgroup$
– StainlessSteelRat
1 hour ago
2
2
$begingroup$
I have a hard time believing that your zoomed in version is actually a new trig. Nothing would look like that except the scope's internal interpolation. An clean break with an RC-filter created by the scope would show an exponential clean rise - nothing linear. I bet that you just zoomed in on the stored waveform.
$endgroup$
– pipe
29 mins ago
$begingroup$
I have a hard time believing that your zoomed in version is actually a new trig. Nothing would look like that except the scope's internal interpolation. An clean break with an RC-filter created by the scope would show an exponential clean rise - nothing linear. I bet that you just zoomed in on the stored waveform.
$endgroup$
– pipe
29 mins ago
1
1
$begingroup$
My zoomed photo is from another capture with battery instead of power supply. But as @pipe sait I have captured on zoomed out view and then zoomed on the rising edge after that. Now I understand that changing time scale before the capture and after the capture is different things? I didn't know that. I will need to figure out how to capture when time scale is set to uSec range.
$endgroup$
– Deniz
21 mins ago
$begingroup$
My zoomed photo is from another capture with battery instead of power supply. But as @pipe sait I have captured on zoomed out view and then zoomed on the rising edge after that. Now I understand that changing time scale before the capture and after the capture is different things? I didn't know that. I will need to figure out how to capture when time scale is set to uSec range.
$endgroup$
– Deniz
21 mins ago
|
show 10 more comments
2 Answers
2
active
oldest
votes
$begingroup$
First, "zoom in" to that rising edge by adjusting the time base. When you start getting close, you will start to see the rising slope of the signal.
As you do this, you will start to lose resolution on your captured signal. You can capture new samples of that rising edge using the scope's triggering mechanism.
Once you can see the rising slope, capture a new sample. Any bouncing/overshoot/noise should become apparent.
answered 1 hour ago
bitsmackbitsmack
11.9k73677
$endgroup$
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
43 mins ago
1
$begingroup$
If you zoom a stored waveform it may not have intermediate samples and just interpolate. You may see the edge sharper if you store a new sample at the higher timebase setting. As mentioned, good or new switches may have very little detectable bounce.
$endgroup$
– KalleMP
38 mins ago
$begingroup$
@Deniz no switch closure is going to result in a piecewise linear pulse -- that has to be a zoom-in of something sampled at a lower rate (probably 150$mu$s, because that's how long it's taking to rise up).
$endgroup$
– TimWescott
20 mins ago
add a comment |
$begingroup$
Figure 1. The guys down at photo-forensics found this.
There are several factors:
- You have a nice new clean switch that bounces very little.
- Your scope is loading the circuit and the 15 pF is enough to help. This is unlikely, though, with what appears to be a resistor with a value in the hundreds of ohms. (The colour rendition of your photo is poor.)
- Timebase is too fast - but your comments say you've checked this.
I'd go with the first and second option.
answered 1 hour ago
TransistorTransistor
88.2k785189
$endgroup$
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
42 mins ago
$begingroup$
So you think the 15pF is loading the 220 Ohms with a 3.3ns RC asymptote resulting in a 150us linear ramp? Ask the forensic guys to check again. My forensic guy said it smelt like 220 ohm i.stack.imgur.com/xEwUo.png
$endgroup$
– Sunnyskyguy EE75
16 mins ago
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
First, "zoom in" to that rising edge by adjusting the time base. When you start getting close, you will start to see the rising slope of the signal.
As you do this, you will start to lose resolution on your captured signal. You can capture new samples of that rising edge using the scope's triggering mechanism.
Once you can see the rising slope, capture a new sample. Any bouncing/overshoot/noise should become apparent.
answered 1 hour ago
bitsmackbitsmack
11.9k73677
$endgroup$
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
43 mins ago
1
$begingroup$
If you zoom a stored waveform it may not have intermediate samples and just interpolate. You may see the edge sharper if you store a new sample at the higher timebase setting. As mentioned, good or new switches may have very little detectable bounce.
$endgroup$
– KalleMP
38 mins ago
$begingroup$
@Deniz no switch closure is going to result in a piecewise linear pulse -- that has to be a zoom-in of something sampled at a lower rate (probably 150$mu$s, because that's how long it's taking to rise up).
$endgroup$
– TimWescott
20 mins ago
add a comment |
$begingroup$
First, "zoom in" to that rising edge by adjusting the time base. When you start getting close, you will start to see the rising slope of the signal.
As you do this, you will start to lose resolution on your captured signal. You can capture new samples of that rising edge using the scope's triggering mechanism.
Once you can see the rising slope, capture a new sample. Any bouncing/overshoot/noise should become apparent.
answered 1 hour ago
bitsmackbitsmack
11.9k73677
$endgroup$
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
43 mins ago
1
$begingroup$
If you zoom a stored waveform it may not have intermediate samples and just interpolate. You may see the edge sharper if you store a new sample at the higher timebase setting. As mentioned, good or new switches may have very little detectable bounce.
$endgroup$
– KalleMP
38 mins ago
$begingroup$
@Deniz no switch closure is going to result in a piecewise linear pulse -- that has to be a zoom-in of something sampled at a lower rate (probably 150$mu$s, because that's how long it's taking to rise up).
$endgroup$
– TimWescott
20 mins ago
add a comment |
$begingroup$
First, "zoom in" to that rising edge by adjusting the time base. When you start getting close, you will start to see the rising slope of the signal.
As you do this, you will start to lose resolution on your captured signal. You can capture new samples of that rising edge using the scope's triggering mechanism.
Once you can see the rising slope, capture a new sample. Any bouncing/overshoot/noise should become apparent.
answered 1 hour ago
bitsmackbitsmack
11.9k73677
$endgroup$
First, "zoom in" to that rising edge by adjusting the time base. When you start getting close, you will start to see the rising slope of the signal.
As you do this, you will start to lose resolution on your captured signal. You can capture new samples of that rising edge using the scope's triggering mechanism.
Once you can see the rising slope, capture a new sample. Any bouncing/overshoot/noise should become apparent.
answered 1 hour ago
bitsmackbitsmack
11.9k73677
edited 12 mins ago
answered 1 hour ago
bitsmackbitsmack
11.9k73677
answered 1 hour ago
bitsmackbitsmack
11.9k73677
answered 1 hour ago
bitsmackbitsmack
11.9k73677
11.9k73677
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
43 mins ago
1
$begingroup$
If you zoom a stored waveform it may not have intermediate samples and just interpolate. You may see the edge sharper if you store a new sample at the higher timebase setting. As mentioned, good or new switches may have very little detectable bounce.
$endgroup$
– KalleMP
38 mins ago
$begingroup$
@Deniz no switch closure is going to result in a piecewise linear pulse -- that has to be a zoom-in of something sampled at a lower rate (probably 150$mu$s, because that's how long it's taking to rise up).
$endgroup$
– TimWescott
20 mins ago
add a comment |
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
43 mins ago
1
$begingroup$
If you zoom a stored waveform it may not have intermediate samples and just interpolate. You may see the edge sharper if you store a new sample at the higher timebase setting. As mentioned, good or new switches may have very little detectable bounce.
$endgroup$
– KalleMP
38 mins ago
$begingroup$
@Deniz no switch closure is going to result in a piecewise linear pulse -- that has to be a zoom-in of something sampled at a lower rate (probably 150$mu$s, because that's how long it's taking to rise up).
$endgroup$
– TimWescott
20 mins ago
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
43 mins ago
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
43 mins ago
1
1
$begingroup$
If you zoom a stored waveform it may not have intermediate samples and just interpolate. You may see the edge sharper if you store a new sample at the higher timebase setting. As mentioned, good or new switches may have very little detectable bounce.
$endgroup$
– KalleMP
38 mins ago
$begingroup$
If you zoom a stored waveform it may not have intermediate samples and just interpolate. You may see the edge sharper if you store a new sample at the higher timebase setting. As mentioned, good or new switches may have very little detectable bounce.
$endgroup$
– KalleMP
38 mins ago
$begingroup$
@Deniz no switch closure is going to result in a piecewise linear pulse -- that has to be a zoom-in of something sampled at a lower rate (probably 150$mu$s, because that's how long it's taking to rise up).
$endgroup$
– TimWescott
20 mins ago
$begingroup$
@Deniz no switch closure is going to result in a piecewise linear pulse -- that has to be a zoom-in of something sampled at a lower rate (probably 150$mu$s, because that's how long it's taking to rise up).
$endgroup$
– TimWescott
20 mins ago
add a comment |
$begingroup$
Figure 1. The guys down at photo-forensics found this.
There are several factors:
- You have a nice new clean switch that bounces very little.
- Your scope is loading the circuit and the 15 pF is enough to help. This is unlikely, though, with what appears to be a resistor with a value in the hundreds of ohms. (The colour rendition of your photo is poor.)
- Timebase is too fast - but your comments say you've checked this.
I'd go with the first and second option.
answered 1 hour ago
TransistorTransistor
88.2k785189
$endgroup$
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
42 mins ago
$begingroup$
So you think the 15pF is loading the 220 Ohms with a 3.3ns RC asymptote resulting in a 150us linear ramp? Ask the forensic guys to check again. My forensic guy said it smelt like 220 ohm i.stack.imgur.com/xEwUo.png
$endgroup$
– Sunnyskyguy EE75
16 mins ago
add a comment |
$begingroup$
Figure 1. The guys down at photo-forensics found this.
There are several factors:
- You have a nice new clean switch that bounces very little.
- Your scope is loading the circuit and the 15 pF is enough to help. This is unlikely, though, with what appears to be a resistor with a value in the hundreds of ohms. (The colour rendition of your photo is poor.)
- Timebase is too fast - but your comments say you've checked this.
I'd go with the first and second option.
answered 1 hour ago
TransistorTransistor
88.2k785189
$endgroup$
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
42 mins ago
$begingroup$
So you think the 15pF is loading the 220 Ohms with a 3.3ns RC asymptote resulting in a 150us linear ramp? Ask the forensic guys to check again. My forensic guy said it smelt like 220 ohm i.stack.imgur.com/xEwUo.png
$endgroup$
– Sunnyskyguy EE75
16 mins ago
add a comment |
$begingroup$
Figure 1. The guys down at photo-forensics found this.
There are several factors:
- You have a nice new clean switch that bounces very little.
- Your scope is loading the circuit and the 15 pF is enough to help. This is unlikely, though, with what appears to be a resistor with a value in the hundreds of ohms. (The colour rendition of your photo is poor.)
- Timebase is too fast - but your comments say you've checked this.
I'd go with the first and second option.
answered 1 hour ago
TransistorTransistor
88.2k785189
$endgroup$
Figure 1. The guys down at photo-forensics found this.
There are several factors:
- You have a nice new clean switch that bounces very little.
- Your scope is loading the circuit and the 15 pF is enough to help. This is unlikely, though, with what appears to be a resistor with a value in the hundreds of ohms. (The colour rendition of your photo is poor.)
- Timebase is too fast - but your comments say you've checked this.
I'd go with the first and second option.
answered 1 hour ago
TransistorTransistor
88.2k785189
answered 1 hour ago
TransistorTransistor
88.2k785189
answered 1 hour ago
TransistorTransistor
88.2k785189
answered 1 hour ago
TransistorTransistor
88.2k785189
88.2k785189
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
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– Deniz
42 mins ago
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So you think the 15pF is loading the 220 Ohms with a 3.3ns RC asymptote resulting in a 150us linear ramp? Ask the forensic guys to check again. My forensic guy said it smelt like 220 ohm i.stack.imgur.com/xEwUo.png
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– Sunnyskyguy EE75
16 mins ago
add a comment |
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I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
42 mins ago
$begingroup$
So you think the 15pF is loading the 220 Ohms with a 3.3ns RC asymptote resulting in a 150us linear ramp? Ask the forensic guys to check again. My forensic guy said it smelt like 220 ohm i.stack.imgur.com/xEwUo.png
$endgroup$
– Sunnyskyguy EE75
16 mins ago
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
42 mins ago
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
42 mins ago
$begingroup$
So you think the 15pF is loading the 220 Ohms with a 3.3ns RC asymptote resulting in a 150us linear ramp? Ask the forensic guys to check again. My forensic guy said it smelt like 220 ohm i.stack.imgur.com/xEwUo.png
$endgroup$
– Sunnyskyguy EE75
16 mins ago
$begingroup$
So you think the 15pF is loading the 220 Ohms with a 3.3ns RC asymptote resulting in a 150us linear ramp? Ask the forensic guys to check again. My forensic guy said it smelt like 220 ohm i.stack.imgur.com/xEwUo.png
$endgroup$
– Sunnyskyguy EE75
16 mins ago
add a comment |
Deniz is a new contributor. Be nice, and check out our Code of Conduct.
Deniz is a new contributor. Be nice, and check out our Code of Conduct.
Deniz is a new contributor. Be nice, and check out our Code of Conduct.
Deniz is a new contributor. Be nice, and check out our Code of Conduct.
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6
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Have you tried adjusting the time base / horizontal scale?
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– NMF
1 hour ago
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Yeah, zoom in farther. Although, I must say that switches typically bounce for 1-10ms, and that should be visible on the OP's 50ms/div timescale. That's surprisingly clean switch.
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– Toor
1 hour ago
1
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If you don't succeed on the first try, try again.
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– StainlessSteelRat
1 hour ago
2
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I have a hard time believing that your zoomed in version is actually a new trig. Nothing would look like that except the scope's internal interpolation. An clean break with an RC-filter created by the scope would show an exponential clean rise - nothing linear. I bet that you just zoomed in on the stored waveform.
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– pipe
29 mins ago
1
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My zoomed photo is from another capture with battery instead of power supply. But as @pipe sait I have captured on zoomed out view and then zoomed on the rising edge after that. Now I understand that changing time scale before the capture and after the capture is different things? I didn't know that. I will need to figure out how to capture when time scale is set to uSec range.
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– Deniz
21 mins ago