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Test Equipment / Re: Choosing between entry-level 12-bit DSOs
« Last post by Fungus on Today at 02:56:25 pm »
Discussion is going in wrong direction. Beginner that wants entry level scope has no knowledge to understand all DSP stuff being discussed. They need device to simply work. User will bring in enough of it's own confusion into the process.

Rigol UI is better for a beginner so the correct advice is to say "get a Rigol but don't try to measure 250Mhz on 4 channels until you understand things better".

A "beginner that wants entry level 'scope" probably has no 200Mhz signals lying around anyway.

(I'm not even sure I do...)
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General Technical Chat / Re: How does this stuff work?
« Last post by T3sl4co1l on Today at 02:52:31 pm »
Piezo disc I guess?

I suppose the coil would be loading, compensation for the disc capacitance, then.  I mean, you have the parts in front of you, you can trace the circuit -- then measure the coil, and see what the impedance of the whole thing is at audio frequencies.

POTS was 600 ohm, wasn't it?  Should have a peak or valley impedance around that, in the phone range (500-3000 Hz).

Tim
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This thread has been great reading.

For anyone who has two DP100, do you know if it is possible/safe to chain them for positive and negative voltages?

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Is strobo light mentioned.
It can at least artificially freeze something.
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So how about scenario 4: change scale, wait a couple of minutes, then pull the power cord?
If it still remembers the settings change, then saving them is purely timeout-based.
Yes that's exactly what happens. It does not need the power button to be pressed for the settings to get saved, but it appears to need some time to pass after a change is made.
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Test Equipment / Re: Siglent SDS800X HD 12 bit DSO's
« Last post by KungFuJosh on Today at 02:47:06 pm »
These have been compatible with all my TE: https://www.amazon.com/gp/product/B09FFK1QLR
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Beginners / Re: Help understanding Kirchoff's Voltage Law/Current Law
« Last post by wasedadoc on Today at 02:44:57 pm »
Correct as far as you have gone.

Don't fall into the trap of "One path has the current flow through a 1k resistor then a 2k resistor (so 3k ohms total resistance).  The other path has the current flow through a total of 9k resistance." making you think you can calculate the current through each of those separately and then add them together to get the total current from the cell.
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Test Equipment / Re: Siglent SDS800X HD 12 bit DSO's
« Last post by 2N3055 on Today at 02:44:54 pm »
Enjoying delving into my new scope.

Have a question though, and this might apply to all the Siglent scopes/etc..

What is the largest USB drive one can use and is this mentioned anywhere in the FM?  I have a 4GB one that works, but 64GB and larger ones do not.  The 4GB one is on it's last legs.

I use SanDisk Extreme USB 3.0 32GB for my scopes. Make sure FS is FAT32

chkdsk f:

The type of the file system is FAT32.
Access is denied.

Volume ESD-USB created 21.3.2024. 16:30
Volume Serial Number is DCA1-BD67
Windows is verifying files and folders...
File and folder verification is complete.

Windows has scanned the file system and found no problems.
No further action is required.
   30 623 744 KB total disk space.
           32 KB in 2 hidden files.
        1 488 KB in 89 folders.
    9 641 264 KB in 963 files.
   20 980 944 KB are available.

       16 384 bytes in each allocation unit.
    1 913 984 total allocation units on disk.
    1 311 309 allocation units available on disk.
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Mechanical & Automation Engineering / Re: Paint Bubbles On Snowblower
« Last post by T3sl4co1l on Today at 02:44:00 pm »
Factory prep? Perhaps. Bad paint formulation? Possible.  Incorrectly applied?  Possible. Inappropriate or poor undercoat/primer, or surface activation,  or plating or etc.?  Who knows.  Coatings are a science, but an endlessly complicated one; there are dozens of things that can go right, and thousands that can go wrong.

Which is to say, it is possible to do everything right, and still not have a perfect result.  Hardly grounds for a warranty claim, for example -- if they released product that was grossly and obviously out of compliance with their production standards, yeah, but if they've already done their best effort, I mean, what are you going to expect anyway, at best you just get the thing replaced with an exactly identical product that has the same spread of tolerances.  And not saying you're looking for a warranty claim or any legal remedy, that was already mentioned earlier in this thread anyway, just to say, for things along those lines, what kind of legal sort of basis, if say one wanted to press the issue and if it were still in scope.

I don't see where frame corrosion will ever cause functional breakdown, until it's so visually apparent that you're literally seeing light through it. :)

A perspective that you may find useful.  Steels are often rated in terms of -- wait, we went over this before, with your allthread question, didn't we? -- Material loss rate as a result of corrosion, say in terms of mm/yr, or /decade, under specified conditions.  Clearly, the corrosion rate is currently low; if the bubbling gets thicker, the affected area wider, the paint starts flaking off wholesale -- those are warning signs to monitor.  Until then, don't sweat it, keep it clean, oh and waxed, wax probably helps here too -- and consider major servicing as mentioned if it gets structurally concerning.

Tim
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General Technical Chat / How does this stuff work?
« Last post by amir.razzaqi on Today at 02:41:08 pm »
Hello
The following pictures are related to the disassembled parts of the speaker inside the handset of an old desktop phone (Belgacom maestro 350)
The diaphragm of the speaker is made of two thin metal sheets that act as a 62nf capacitor.
Behind the speaker diaphragm, there is a coil (with gap) that one pins common with diaphragm first pin and the other pin of coil connected to second pin of diaphragm trough a 1K8 resistor.
Does anyone know how this speaker works?
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