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Tablet DSO <= $500 for the recording of sub ms duration DC voltage spike events
Silver_Is_Money:
Any good recommendations? 2 channels will suffice, as only one is needed. Need to be able to quantify the degree of voltage spike with precision.
ebastler:
--- Quote from: Silver_Is_Money on December 31, 2023, 02:55:16 pm ---Any good recommendations? 2 channels will suffice, as only one is needed. Need to be able to quantify the degree of voltage spike with precision.
--- End quote ---
Hmm... What do you mean by "degree of voltage spike"? Do you need to count the spikes, measure their average or maximum amplitude, or create a histogram of spike amplitudes, durations, integrated areas...? I.e. which analysis capabilities do you need in the scope?
Also, what duration of spikes are you looking at? I.e. what time resolution or bandwidth does the scope need to provide?
csuhi17:
--- Quote from: ebastler on December 31, 2023, 08:29:53 pm ---
--- Quote from: Silver_Is_Money on December 31, 2023, 02:55:16 pm ---Any good recommendations? 2 channels will suffice, as only one is needed. Need to be able to quantify the degree of voltage spike with precision.
--- End quote ---
Hmm... What do you mean by "degree of voltage spike"? Do you need to count the spikes, measure their average or maximum amplitude, or create a histogram of spike amplitudes, durations, integrated areas...? I.e. which analysis capabilities do you need in the scope?
Also, what duration of spikes are you looking at? I.e. what time resolution or bandwidth does the scope need to provide?
--- End quote ---
I think that's what he meant.
--- Quote from: Silver_Is_Money on December 26, 2023, 12:03:07 am ---
--- Quote from: Fungus on December 25, 2023, 07:51:45 pm ---Yes.
But... on many 'scopes you can reduce the sample rate to get more time.
eg. If a 'scope lets you reduce the rate to 1Msa/sec then you can record for 8 seconds.
--- End quote ---
That's great to know. But I'm trying to record a DC voltage spike event that will only last for about 1.8 ms from start to finish, and capture it in fine detail. With the critical voltage rise peak occurring at about 0.25 ms after triggering, and with peak rise lasting for only about 0.02 ms. Or in other words, the most critical capture range will occur at between 0.24 and 0.26 ms post triggering on rise.
--- End quote ---
Silver_Is_Money:
--- Quote from: ebastler on December 31, 2023, 08:29:53 pm ---
--- Quote from: Silver_Is_Money on December 31, 2023, 02:55:16 pm ---Any good recommendations? 2 channels will suffice, as only one is needed. Need to be able to quantify the degree of voltage spike with precision.
--- End quote ---
Hmm... What do you mean by "degree of voltage spike"? Do you need to count the spikes, measure their average or maximum amplitude, or create a histogram of spike amplitudes, durations, integrated areas...? I.e. which analysis capabilities do you need in the scope?
Also, what duration of spikes are you looking at? I.e. what time resolution or bandwidth does the scope need to provide?
--- End quote ---
My intention is to measure the spike in voltage that expresses (relative) chamber pressure when a strain gage is glued to a barrel above mid-chamber in a shotgun or rifle. The voltage will be derived from an amplified Wheatstone Bridge, utilizing a quality low noise amplifier. Since resistance is linear to voltage, and voltage is linear to pressure, the voltage 'spike' as amplified and measured across a balanced Wheatstone bridge (with the condition of ohm balance equating to an initial zero voltage condition) can be equated to 'relative' pressure, whereby such pressure is 'relative' to a carefully chosen and selected reference load of known pressure (from which a system specific multiplier derived from the known pressure of the reference load can be related to voltages observed for other loads, and more specifically reloads).
The entire curve of pressure (as converted into positive voltage via the Wheatstone Bridge) is anticipated to have a duration on the order of 1,6 ms, with the peak occurring roughly at 0.25 ms post ignition, and having a peak duration lasting (plateauing) for perhaps on the order of only about 5 to 10 ns.
ebastler:
--- Quote from: Silver_Is_Money on December 31, 2023, 09:02:54 pm ---The entire curve of pressure (as converted into positive voltage via the Wheatstone Bridge) is anticipated to have a duration on the order of 1,6 ms, with the peak occurring roughly at 0.25 ms post ignition, and having a peak duration lasting (plateauing) for perhaps on the order of only about 5 to 10 ns.
--- End quote ---
Are you sure you mean 10 nanoseconds at the end of that sentence, not 10 microseconds?
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