Products > Test Equipment
DIY Logic Analyzer Probe and Pods for Siglent (and LeCroy) scopes
mawyatt:
Recall somewhere that the LA for the lower level Siglent scopes had significant active circuitry, thus more difficult to DIY implement.
Agree with 2N3055, with the Siglent SDS2000X+ and with the Thomas DIY LA (completely passive) you've got a really good setup. Don't worry too much about the twisted pair or coax for the LA, both should perform well, even the Ribbon Cable we used seems to work well at lower speeds. Of course if you are trying to squeeze the best overall performance for the LA, then not only the cable type but the impedance networks in the LA base and POD must be tuned, but this is an ongoing effort we hope to get back on soon ::)
Just used the SDS2102X+ to show results from a mathematical solution of a coupling network (don't want to clutter this thread with details unless others are interested), what an absolute jewel of an instrument IMO. Being an old retired EE that has used about every analog scope Tek ever made, I was naive about the capabilities of these new MSOs. Since getting the Siglent, the pair of Tek 2465s haven't been used much, the Siglent is that good and right away became a very useful instrument :D
Best,
Johnny B Good:
I'm quite impressed with mine but I do have a couple of minor criticisms. The most significant being the 46 seconds boot up delay versus the 16 seconds of the SDS1202X-E and the not quite so significant yet much higher than expected increased power consumption (54W versus the 22W of the 1202).
In view of the almost 2 1/2 times greater energy consumption, suggesting the use of a more power hungry faster processor, that significantly protracted boot up time is a rather surprising shortcoming. I can only assume the extra channels and larger feature set have added to the initialisation burden with additional time constraints that no amount of extra CPU grunt can mitigate - the price of progress in this case, perhaps? :-//
I hope this isn't the start of a trend leading us back to the days of those Tektronix 500W space heaters so cunningly disguised as test and measurement kit labelled "545A Oscilloscope". >:D
oz2cpu:
if boot up time is an issue Johnny,
try this : Tenma 72-8225a 50mhz 2 Channel Digital Oscilloscope With 500ms/s Sampling Rate
it takes 4 sec, from power on, THEN it is fully ready to rock :-)
I have not seen anything beat this.
Sold it, got a Rigol,
sold the rigol, got a Siglent.
Every time I got alot more bootup time.
but really not an issue for me, I used to work with R&S RTO scope, it is a few mins of bootup and a loud storm of fan noise
2N3055:
--- Quote from: Johnny B Good on May 23, 2021, 04:58:39 pm --- I'm quite impressed with mine but I do have a couple of minor criticisms. The most significant being the 46 seconds boot up delay versus the 16 seconds of the SDS1202X-E and the not quite so significant yet much higher than expected increased power consumption (54W versus the 22W of the 1202).
In view of the almost 2 1/2 times greater energy consumption, suggesting the use of a more power hungry faster processor, that significantly protracted boot up time is a rather surprising shortcoming. I can only assume the extra channels and larger feature set have added to the initialisation burden with additional time constraints that no amount of extra CPU grunt can mitigate - the price of progress in this case, perhaps? :-//
I hope this isn't the start of a trend leading us back to the days of those Tektronix 500W space heaters so cunningly disguised as test and measurement kit labelled "545A Oscilloscope". >:D
--- End quote ---
Keysight MSOX-3104T boots 1 minute, 45 seconds.. That's 105 seconds... |O
Enjoy your very fast booting scope... :-DD
Johnny B Good:
@oz2cpu
Thanks for offering that perspective. :) I guess it's normal to not only expect more performance and features for the extra money but also more boot time and power consumption too! The thing was, I just wasn't expecting to get quite so much of either. ::)
Intrigued, I googled "Tenma 72-8225a 50MHz" only to find SFA information in the two page 'datasheet' provided by Farnell for their UNI-T rebrand which they're now selling the 1Gsps version for a mere £197.20 (VAT inclusive price) which is half the typical Ebay sellers' price point (the cheapest being £320). It's unusual to say the least, to find Farnell undercutting competing sellers by any amount let alone by more than 50%!
If anyone's in the market for an 'entry level 'scope, they certainly won't be buying a Tenma 72-8225a from any of these sellers
https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=Tenma+72-8225a+50MHz&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=Tenma+72-8225a+2nd+hand
Nor from this one >:D
https://uk.farnell.com/tenma/72-8225a/oscilloscope-2-ch-50mhz-500msps/dp/2499522?mckv=soDoPBV12_dc|pcrid||plid||kword||match|e|slid||product|2499522|pgrid|1357897483847209|ptaid|pla-4588468182313071|&CMP=KNC-GUK-GEN-SHOPPING-SMEC-WHOOPS-Test725-minROAS-Step1&gross_price=true&msclkid=a71687df1b5f1abf0db7e775b3d6aa13
There's some very peculiar price variations being applied to this Tenma 72-8225A 'scope.
I can see the appeal of a 'scope priced at just £197 to the cash strapped hobbyist whose needs are rather modest but I can't figure out the appeal when they're being priced at £334.57 and higher. Surely, anyone checking out this budget end of the 'scope market will have already seen the better alternatives from Rigol and Siglent in their searches? I mean :wtf: Who would be so stupid as to pay those prices for a UNI-T 'scope sullied by the Farnell branding?
[EDIT]
For those whose budgets just won't stretch to Rigol or Siglent kit, there's always the Hantek DSO2D10 available from BangGood priced at just £164.95 (plus £9.24 shipping fee to the UK from their CN warehouse). Cheaper again with 1GSa/s 100MHz BW plus a built in single channel AWG (25MHz max sine) with nicer looking on screen fonts.
https://www.banggood.com/Hantek-DSO2D10-Digital-Oscilloscope-2CH+1CH-Digital-Storage-1GS-or-s-Sampling-Rate-100MHz-Bandwidth-Dual-Channel-Economical-Oscilloscope-with-Signal-Source(AWG)-p-1765904.html?cur_warehouse=CN&rmmds=category
I spotted this in one of today's BangGood junk mails and decided, in view of my contributions here, to take a closer look. It's actually quite well specced for the money (it even includes an extra 9 to 10 second's worth of boot up time :) ). Indeed, if it had been available at that price two and a half years ago when I'd been looking to upgrade a 5MHz BW boat anchor that was already ancient when I'd bought it some 40 years ago, I may well have purchased that instead as my very first modern day DSO.
Trying to track down any meaningful reviews on this Hantek led me to a how to hack it to 200MHz BW youtube video with a link to a 125 page EEVBlog thread originated way back in October 2010 active right up to the 11th of this month!
https://www.eevblog.com/forum/testgear/hantek-tekway-dso-hack-get-200mhz-bw-for-free/msg21170/#msg21170
for anyone curious enough to take a look.
Even at the reduced price, I can't really see Farnell selling many (if any) of these rebranded UNI-T DSOs. >:D
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