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Forum Index : Microcontroller and PC projects : Electronics: Zotec ZT-702S Oscilloscope
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panky Guru  Joined: 02/10/2012 Location: AustraliaPosts: 1101 |
For Australian and New Zealand viewers, I have a Hantek DSO5102B which I have had for more than 8 years and it has worked (and still works) a treat. I recently upgraded to a Siglent SDS1104X-U 100MHz 4 channel scope which is a fantastic deal at the moment here in Australia at $572 ( includes GST and shipping half way across the country). It has extensive measurement and sampling functions, built in I2C, SPI, UART and CAN decoding, extensive triggering and video decoding - IMHO, ideal fro anyone doing design/development work with the 'mite family. Best value for money that I have seen recently. This link may be of interest. panky. ... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it! |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6099 |
That's a good price. I paid ~$700 for my SDS1104X-E 4 years ago. I would be lost without it now. Jim VK7JH MMedit MMBasic Help |
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thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4042 |
If anyone cares I ultimately plumped for a Siglent SDS1202X-E, just have to wait for my 50th Birthday to get my sticky fingers on it. Should we start a book on how long it takes me to blow one of its fuses ?  Best wishes, Tom Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9122 |
Nice choice Scopes are easy to use IFF you respect the ground connection. The ground is mains ground and if you connect the ground lead on the probe to something that isn't at mains ground then current will flow. This is more likely to blow up the "something" than the scope and is really dangerous if working on mains equipment that may have a live chassis. So, take the example of the output of your amplifier on the Gamemite both output pins can go between 0 and VCC giving a maximum swing of 2*VCC volts (ignoring end effects). To look at this on the scope you can't just connect the ground to one output and the probe to the other. The way to do this is to use both probes one on each output pin and both ground connections to the circuit ground. Then you set the scope to show the difference between the two probes rather than looking at the individual outputs. There are lots of good videos on youtube (e.g. https://www.youtube.com/watch?v=t_UTV_9dpTc ) on how to actually use a scope, much easier to follow than the manuals which focus on what the knobs do rather than how to use. Edited 2023-10-31 20:42 by matherp |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
That looks good, Tom. :) I've not managed to pop any fuses on my scope yet (or damage it at all, in fact) in spite of opening it up to fit a temperature controlled fan. I finally managed to get hold of the DSO138 (like yours IIRC) from my brother. TBH I'm surprised at how good they are for the silly money. If someone could do with a very basic scope at minimum cost they aren't bad at all. Edited 2023-10-31 20:47 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| LouisG Senior Member  Joined: 19/03/2016 Location: AustraliaPosts: 124 |
Hah! Matherp's IFF brought to mind IDENTIFICATION FRIEND OR FOE, a unit used in British WW2 aircraft. The IFF abbreviation used to cause me confusion when coding dBaseIII+, which used IIF (Immediate IF). ... Louis |
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dMajo Newbie  Joined: 18/05/2020 Location: ItalyPosts: 24 |
We have recently equiped other 3 school laboratories of another technical school with around 160 T&M instruments plus a few accessories and options. The DHO914S and DHO924S are two nice mixed-signal digital scopes equiped with AWG function generator, protocols decode and bode-plot that can be used also in the field with their USB Type-C power connector that can be supplied also from a power-bank. ALLdataEE.com EDU Promos |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4042 |
Thank you Peter. Best wishes, Tom Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| Bleep Guru Joined: 09/01/2022 Location: United KingdomPosts: 509 |
Hi Tom, If you want something cheap and chearfull, I have just got one of these. 2MHz 2 channel portable digital scope. I have tested it and it will do 2Mhz well, 4Mhz starts to round off a square wave a bit, 8Mhz is there @ a reasonable amplitude, but almost a sign wave. but you are getting very close to the limit with a 50MHz sample rate, so only 25MHz sample per chanel. My only quible would be it's fiddley to operate, because everything is done through push buttons and menus. But for just over £30 it's a bargin in my view. Regards, Kevin. Edited 2023-11-14 22:58 by Bleep |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
It's a 'scope. Any 'scope is better than no 'scope. :) That's not bad at all for a 2-channel one. I have a little single-channel battery operated one that's very fiddly to use, but it makes a great 2nd 'scope that can be "floated" above ground without danger of it getting fried. The cheap Chinese ones all have problems. Often the software has bugs that never get fixed. That doesn't mean that they are rubbish, just that they can't be relied upon as precision measuring instruments. For indication they are fine. I think they are all amazing for the cost. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4042 |
Thanks Kevin, as mentioned above I have, or will have on my 50th, a Siglent SDS1202X-E. I only resurrected this thread when I noticed I had never thanked Peter for his reply and the link he posted. And of course thanks to everyone else who is helping my electronics journey too. Best wishes, Tom Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2914 |
Hi All, Whilst I am NOT recommending buying one of those multimeters with built in oscilloscopes, they do have one advantage, and that is they are battery operated so you can’t inadvertently short 240v(120v) by attaching the earth lead to the ‘wrong’ place on your test subject. I have had a further thought, that you could protect your ‘scope by using a battery powered inverter or a UPS (make sure it’s unplugged from the mains) as there is no path to the mains power so no chance of inadvertent shorts. I have thought of buying one of the multimeter options just for this very reason, but then I slap myself about the head to knock some sense into me. They are over priced IMHO anyway. If they were half the price at about $40AU/$25US then I think I would bite the bullet and buy one. I can see that in the future these hand held battery powered scopes will become more and more powerful and cheaper. Kind Regards, Mick (the big one) . Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2129 |
https://www.ebay.co.uk/itm/285392896553?hash=item4272be0229:g:CBIAAOSwSptkuZdr or https://www.ebay.co.uk/itm/394538667167 or cheaper https://www.ebay.co.uk/itm/394764794148 Edited 2023-11-15 08:36 by stanleyella |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9122 |
These are still potentially very dangerous as they have common ground between the channels. If you want to be properly safe you need to spend real money for something like a Fluke 190 |
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| bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2914 |
Hi Peter, All, So far, I have only seen single channel offerings in these cheap multimeter 'scopes. Regards, Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
A single-channel "floating" 'scope is nice when you want to see the grid-cathode voltage. :) Still not great to have your fingers too close to even if the cathode is only at 30V-70V though. Proper electronics, this! :) 330V, not 3.3V. (I wouldn't do this now. A-B on a two-channel scope is far better and safer) Edited 2023-11-15 19:18 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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