Advice on buying first bench scope? Need to know whats best for me! - Page 1
Forum section: electronics / testgear

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: February 16, 2015, 09:04:04 am
content: I know this question probably gets asked a dozen times a day! I have been watching reviews and reading a lot on the topic but there are still some things that I don't think I fully understand. First of all my budget is a firm $350 but im really trying to get down to about $250 bucks! Unfourtantelly ive been out of work for a while and have a new daughter, we are getting are taxes and getting a house and some furniture, maybe a new TV too. These things for the family come first so money is an issue. I would definitely get the new 4 channel Rigol if I could swing it!Right now I own a USB PC scope, it is called the prop scopehttp://www.parallaxinc.com/product/32220it is a 25MPs 2Mhz scope, with a four channel logic analyzer. It suits me well for simple tasks but I have out grown it. I also own Chinese clone saleae 8 channel logic analyzer, and a Bus Pirate. I feel like im pretty set as far as digital debugging and protocol analyzing go. I am starting to learn arm and will want to debug 20mhz SPI but the saleae should do that fine right?Anyways I have a lot of projects that involve analog, and im starting to us 16/24 bit adc and dac chips to make precision current and voltage measurements. One huge problem with my USB scope is the noise! it does 100mv per division but there is always 4mv of ripple on bot channels. This is no good when I want to see exactly how clean a a 3.3v power rail for the analog system is. Ive also been getting more and more in to RF and filters.So basically what I want is a scope with at least 100mhz of bandwidth, Im basically using it to see just how clean my signals are and if they are what I expect them to be, whether they be analog or digital. A nice feature is FFT from what I understand I can use it to see the harmonics of fast rising/falling edges and use that to help track down any ringing from impermanence mismatching? I basically want a scope that will help me find ringing and ripple on signals and power rails.One thing im not sure if I need is the deeper memmory model of a scope, it costs more and it seems to me its useful for storing longer signals, this seems very useful if your using a 4 channel scope to help debug a serial protocol, but isn't that what an LA is for? Another thing is im not even sure if I need a DSO there are some nice analog scopes out there for cheap with lots of bandwith, but im not to sure how usefull these are for debugging signal integrity since im assuming they cant do math functions?Heres what im looking at buying so farSiglent SDS1102 Dual Channel 100Mhz 500M/Sa $340http://www.ebay.com/itm/Siglent-SDS1102DL-7-100MHZ-500MSa-s-32Kpts-Digital-Storage-Oscilloscope-/140892399880?pt=LH_DefaultDomain_0&hash=item20cdd76908Jack Gannsle has a series of reviews on his site about this scope and its functionality looks really nice!! Although it is the priciest one on the list and its only 500M/Sa. Anyone who hasn't seen these may want to go over tohttps://www.youtube.com/channel/UC067MO4ZVsbA8QDJG0qCTJQ/videosand watch his 2 part review. Let me know if it is as slick as he says!Hantek DSO5102P Dual Channel 100Mhz 1Gs $253http://www.ebay.com/itm/Hantek-DSO5102P-Digital-Oscilloscope-100MHz-1Gs-2CH-7-TFT-Compared-TEK-TDS2012-/370877922257?pt=LH_DefaultDomain_0&hash=item565a0bfbd1Ive watched Daves review of this scope, and was really put off (mostly about the front end noise) until I found out he had a faulty one with bad firmware (correct?). This scope is hackable with all kinds of features and is definately the fastest on my list, im not sure whats not to like! Im just not sure if it has all the same firmware features Jack shows off on the siglent. This is the model without deep memmory but once again im not sure I need that deep memmory, or if this scope will even run all that fast when using it?Rigol 1052E, need I say more... Problem is its $350 for a lot less than the other scopes listed, but its rock solid with a huge support base. Probably not a good purchase at this point but I thought I would throw it out there!Hantek DSO4102B Dual Channel 100mhz 5M/sa $277http://www.ebay.com/itm/New-Arrival-Hantek-DSO4102B-100MHz-2CH-Digital-Storage-Oscilloscope-500MSa-s-Sa-/161324640479?pt=LH_DefaultDomain_0&hash=item258fb2a8dfThis guy seems to be a 1052p but with more memmory and half the sample rate, brand new product. Not sure if its hackable yet and not sure if memmory for sample rate is a good trade off..Agilent 5411D 4 channel older DSO 100mhz 400M/sa $250http://www.ebay.com/itm/HP-Agilent-54112D-Digitizing-4-Channel-Oscilloscope-Color-Screen-/151588504161?pt=LH_DefaultDomain_0&hash=item234b610261Good quality name brand, and 4 channels!! It also has 64k of ram which is a lot compared to the Hantek and Siglent with there 4k and 2k respectively. But its clunky and has the lowest sample rate...Tektronix 150mhz 4 channel 2445A analog scope $250http://www.ebay.com/itm/Tektronix-2445A-Four-4-Channel-Oscilloscope-GPIB-Opt-5-and-10-works-150-MHz-/151586429864?pt=LH_DefaultDomain_0&hash=item234b415ba8Im not even sure I need a DSO this one looks darn nice for an analog scope and it seems to be about the price they go forLike I said this is my first bench scope (probably wont be my last, just something to do what I need for a year or two) and when you get in to ebay you can find lots of Quality name Analog and DSOs for about 250 to 350 dollars im just not educated enough about all the models out there to know what to really look for in the older used one. Ive even thought about getting something like the siglent or hantek and then buying an el cheapo analog scope that can do 5 or even 1mv per division and using them togasther. If anyone has any input on the scopes listed above or even knows some other quality scopes in my price range better than these (new or used) then let me know

author: rob77
author_rank: Super Contributor
timestamp: February 16, 2015, 09:46:25 am
content: if the 100MHz bandwidth is important for you then forget the 500MSa/s ones... 500meg samples divided for 2 channels yields 250meg samples per channel and that's barely enough for 100Mhz. i would look after the 1GSa/s ones if the 100Mhz is important.but anyway... the best would be to save up a little more and buy a Rigol DS1054Z (approx $400).

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: February 16, 2015, 10:24:56 am
content: Well I want enough bandwidth to grow with so if im running external buses at 10 to 20mhz I will need a 100 to 200mhz scope to accurately view the wave form correct? Im mostly concerned with a really goo low noise front end (that can do low mv/per div hopefully, if not an amplifier can be built), then secondly firmware (if DSO) that is will let you do things like split the screen and do something like show channel 1 on top and then a zoomed section of it on bottom, or an fft.I would love to get the new rigol but my price is pretty firm at this point. Things may change between now and a week or two when I buy but I doubt it.

author: dom0
author_rank: Super Contributor
timestamp: February 16, 2015, 11:48:46 am
content: I'd consider used scopes.There are for example some LeCroy scopes from the 90s with 1-4 G/s, 500 or 1000 MHz analog bandwidth and 2 or 4 channels. They all have deep memory (>2 Mpts / ch). They usually go in the 150 $ range. Sometimes you find the Hantek/Tekway scopes used, then they also go cheaply (similar ballpark).For debugging digital I would really really recommend only a deep memory (as opposed to "shallow memory" like 4K or 40K pts/ch) scope. It's extremely useful.For noise measurements a scope is usually not the best tool,they are not sensitive enough (usually .5 - 2 mV / div). I recently bought an HP 3400A RMS voltmeter and it works like a charm. Mine has a noise floor of about 30 µVrms. Has 10 MHz (+- 5 %) bandwidth, or in more usual terms a -3 dB bandwidth of about 24 MHz.Probes: They get pricey quickly beyond 100 MHz. Good probes simply cost money. Consider used ones here, too. For a 100 or 200 MHz scope you probably want probes exceeding that rating by quite a margin (<- this isn't easily possible at higher bandwidths like 500 or 1000 MHz). Don't bother with x1/x10 probes, most better probes are fixed x10 anyway.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: February 16, 2015, 12:22:39 pm
content: Quote from: rwgast_lowlevellogicdesin on February 16, 2015, 09:04:04 amNot Agilent, HP! This scope was HP's top of the line 'deep memory scope' in 1987 when 'deep memory' was 64kpts.QuoteYes, and 25+yrs old, and sold as-is i.e. may not even work correctly (and even if it does, at that age there's a high chance that it will fail in the near future). Not exactly a great bargain.QuoteNo, that's sample memory, not RAM.I wouldn't sink any money in this thing unless you know what you're doing.

author: dom0
author_rank: Super Contributor
timestamp: February 16, 2015, 01:25:51 pm
content: Yeah, DSO tech of the 80s is ... not competitive today (or yesterday, for that matter). The very high end stuff of the 90s is a different thing, though. Although I personally wouldn't buy the Teks of that time, because most of them have the plague and probably require replacing all capacitors in the entire device. And if something isn't working chances seem to be pretty good, that leaked electrolyte damaged PCBs and parts badly.Note that LeCroy scopes also do use ASICs (A/D converter) and hybrids (AFE) to some degree, so if you see a LeCroy failing it's input or A/D converter self-test one of those is probably fried.

author: nctnico
author_rank: Super Contributor
timestamp: February 16, 2015, 01:33:17 pm
content: Quote from: dom0 on February 16, 2015, 01:25:51 pmThat is only true for the models (edit: TDS500/600/700 series) sold in the very early 90's. The later ones from 1994 on don't have the leaky capacitor problem at all even if they have electrolytic capacitors.

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: February 16, 2015, 02:23:40 pm
content: dom0 do you mean an analog or dso? I did a search on lecroy earlier and it was pretty pricey. if you have a specific model in mind please let me know!From what Ive read so far my best bet is to pick one of the Chinese scopes, or maybe an old LeCroy? As I said I have plenty of digital debugging tools already so Im not sure I need deep memmory...?

author: dom0
author_rank: Super Contributor
timestamp: February 16, 2015, 03:30:01 pm
content: LeCroy only built very few analog scopes. I think in your range the 9300 series should be interesting, for example the 9354L (4 ch, 500 MHz, 2 GS/s, 8 Mpts memory). But as with all used gear it can take a while to find a good deal, so if you can't wait anything used might not be your dealQuote from: nctnico on February 16, 2015, 01:33:17 pmGood to know

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: February 16, 2015, 04:51:57 pm
content: Quote from: dom0 on February 16, 2015, 03:30:01 pmLeCroy never built an analog scope (they were always a digital 'scope' company right from the start)The analog scopes they once offered where rebadged Iwatsu scopes. Pretty good scopes btw, but hard to find and usually pretty expensive.QuoteIndeed. Also don't discount the later LC300/500 Series which uses color CRTs. These scopes often go for even less than the older 9300 Series.

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: February 16, 2015, 06:31:21 pm
content: So something like thishttp://www.ebay.com/itm/LeCroy-9450A-2-Channel-Dual-300MHz-400Ms-s-Portable-Digital-Oscilloscope-/300921038367?pt=LH_DefaultDomain_0&hash=item46104aa61fwill be better than the hantek hands down?

author: FrankenPC
author_rank: Unknown
timestamp: February 16, 2015, 06:39:50 pm
content: Quote from: rwgast_lowlevellogicdesin on February 16, 2015, 06:31:21 pmThe item weighs 150LB's?!!

author: dom0
author_rank: Super Contributor
timestamp: February 16, 2015, 07:29:23 pm
content: The 9450A has only 50 Kpts memory per channel and a single-shot sampling rate of 400 MS/sQuote from: FrankenPC on February 16, 2015, 06:39:50 pmThat is rather unlikelyQuote

author: dadler
author_rank: Unknown
timestamp: February 16, 2015, 07:36:15 pm
content: I don't want to make you feel bad, but I don't think you really 'need' a scope. This sounds like more of a 'want' situation, and in that case I really think you should save up the extra money for the DS1054Z. With the EEVBlog discount, you can get this scope for $375 delivered from Tequipment.net.This scope is so much more capable (and extremely upgradable) than any you have listed, and is so much more of a value, that you are in a sense throwing money away if you go for those other scopes.The money may be burning a hole in your pocket, but do yourself a favor and skip Starbucks for a month and get the 1054Z.Just my opinion, worth exactly what you paid for it.

author: dom0
author_rank: Super Contributor
timestamp: February 16, 2015, 07:39:23 pm
content: The 1054Z is a great scope, no one doubts that... but it has only 50 MHz bandwidth (dunno, can you still unlock these?), which is kinda... not much.

author: nctnico
author_rank: Super Contributor
timestamp: February 16, 2015, 07:51:57 pm
content: Quote from: rwgast_lowlevellogicdesin on February 16, 2015, 06:31:21 pmWith that much screen burn? Definitely NO!But... you can get better deals. A couple of years ago I bought a Tektronix TDS510A (4 channel 500MHz) for around $230 (ex. shipping). The trim was broken up and the glass covering the display was smashed in but it still works like a charm.Picking out the right 'for parts' unit and adding some elbow grease can get you a nice scope for peanuts.

author: dom0
author_rank: Super Contributor
timestamp: February 16, 2015, 07:54:36 pm
content: Quote from: nctnico on February 16, 2015, 07:51:57 pmThe Art ofWarbuying surplus equipment.

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: February 16, 2015, 08:03:49 pm
content: I had no idea you could get the new rigol for $375 shipped... How do you get this eevblog discount? I may be able to stretch to 375 if that includes shipping... Also can you unlock them like the 1052E?

author: dadler
author_rank: Unknown
timestamp: February 16, 2015, 08:13:02 pm
content: Quote from: rwgast_lowlevellogicdesin on February 16, 2015, 08:03:49 pmSent you a PM.

author: smgvbest
author_rank: Unknown
timestamp: February 17, 2015, 01:38:50 am
content: I agree with the Rigol DS1054Z then hack it to 100Mhz and hacked people are seeing up to 130Mhz in reality plus you see allot of other features with triggering and such. with the eevblog discount as mentioned it is really worth saving the little extra and get it as a good starter scope. IMHO

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: February 17, 2015, 05:56:42 am
content: Welp now that I know I can get it for that price I think I talked the old lady into let me go up in price a bit and getting one. Id still like to save some money though so if anyone knows of any scopes with awesome deals or used scopes comparable to the rigol let me know.So the rigol works as a 4 channel LA along with protocol debugger too correct? What kind of other goodies does it have? Im pretty sold on the intensity graded display I know that. Im just not sure what LAN is for and all that kind of good stuff

author: alex.forencich
author_rank: Frequent Contributor
timestamp: February 17, 2015, 08:24:39 am
content: Quote from: rwgast_lowlevellogicdesin on February 17, 2015, 05:56:42 amYeah, it basically acts like a 4 channel LA, which is great for most serial protocols. The LAN port is nice in that you can yank traces off of the scope directly to your computer over your home/workshop network. I do this all the time to save screenshots and traces; it avoids the need to get out the flash drive.

author: EPLan
author_rank: Contributor
timestamp: February 17, 2015, 08:49:18 am
content: What's your opinion on the? Do you think there might be some tweaked hardware changes in the near future?

author: Fungus
author_rank: Super Contributor
timestamp: February 17, 2015, 03:52:03 pm
content: Quote from: rwgast_lowlevellogicdesin on February 16, 2015, 10:24:56 amNo.You need a 100 to 200mhzsample rate. Not the same thing at all.Anyway, there's only one possible choice at that price range. The Rigol 1054Z. Don't even bother looking at anything else. If it's $50 more than your budget then change the budget.I could understand your complaint if I was telling you to get something that cost hundreds of dollars more but it's $50. Find a way...

author: dom0
author_rank: Super Contributor
timestamp: February 17, 2015, 04:07:40 pm
content: Quote from: Fungus on February 17, 2015, 03:52:03 pmUhm, nope, if you want to accurately reproduce digital waveforms (i.e. pulses, square waves) you need much higher bandwidth than the fundamental frequency. At least ten times the fundamental. To properly judge the edges you need even more bandwidth, since you likely want a faster rise time of your test setup than the rise time of the edge... else you can't judge it, really. So for most digital work a 100 MHz scope is more on the lower end of what is useful. For higher speed digital circuits it's no good anyway.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: February 17, 2015, 06:03:54 pm
content: Quote from: dom0 on February 17, 2015, 04:07:40 pmI have to agree with dom0, for a 20MHz bus a 100MHz scope isn't really going to cut it if you really want to see the true signal and not some waveform which doesn't have much to do with what's actually going on.To make matters worse, I don't think a tiny budget of $350 will get you anything sensible. It's just too small for a decent scope. You might be able to stretch to a Rigol DS1054z but even after hacking you're still left with too little bandwidth, and in the used space anything that has the required bandwidth (200Mhz min), a decent sample rate (1GSa/s min) and at least somewhat decent sample memory (250k if you're really conservative, reasonably it should be at least 1MB; all per channel) and is in fully working condition will set you back more than $350. And what's left (slow antique DSOs with tiny memory, analog scopes) isn't really suited for the task, and especially with these old DSOs comes with a high chance of turning into a money pit.

author: WattsUp
author_rank: Regular Contributor
timestamp: February 17, 2015, 06:14:35 pm
content: If you do manage to pick up a higher bandwidth scope, don't underestimate the cost of probes. Even passive probes up to 500MHz can cost well over £100 quid.

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: February 18, 2015, 12:41:24 am
content: Hmm from what ive read a 100mhz scope can measure a 10Mhz square wave with no loss and up to a 3.5ns rise time. Is this correct?My USB scope with 25Ms usb scope seems to do an alright job of measuring 1mhz squaves so I would hope a 1GA/s scopw would do much more.

author: rob77
author_rank: Super Contributor
timestamp: February 19, 2015, 07:42:49 pm
content: actually if you have some imagination and you know what is a square wave technically (crapload of sine harmonics put together), then you can "see" even a 30-40MHz square wave on a 100MHz scope - obviously it will be not square but rather "wavy"of course if you need accurately measure the rising and falling edges, then you need a huge bandwidth.

author: Fungus
author_rank: Super Contributor
timestamp: February 19, 2015, 08:21:28 pm
content: Quote from: rob77 on February 19, 2015, 07:42:49 pmYep. Ignore the pedants on here and go for the 1054Z. It's plenty good enough to look at a 10-20Mhz square wave and be able to say "that's a 10MHz square wave!" (or whatever).

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: February 19, 2015, 10:14:15 pm
content: Quote from: Fungus on February 19, 2015, 08:21:28 pmSure, and a whole lot of physical laws along with it. But who needs that stuff anyways.QuoteOf course, what's so interesting on what's really happening in a circuit anyways. If it doesn't work as expected just build something else instead.

author: EEVblog
author_rank: Unknown
timestamp: February 20, 2015, 12:27:58 am
content: Quote from: dom0 on February 17, 2015, 04:07:40 pmI argue that anyone who has to ask advice on buying their first scope is not going to understand, have the need for, nor care about accurately reproducing digital signal and their edges (i.e exact signal fidelity).It's a complete non-issue.The 50/100MHz Rigol DS1054Z is more than good enough for any job the OP or any other beginner will have.

author: EEVblog
author_rank: Unknown
timestamp: February 20, 2015, 12:31:16 am
content: Quote from: EPLan on February 17, 2015, 08:49:18 amIt seems to be fixed good enough. No one knows if hardware will change, but even if it does you won't notice.No one should hold off buying the DS1054Z because a hardware change might come eventually.

author: nctnico
author_rank: Super Contributor
timestamp: February 20, 2015, 01:02:06 am
content: Quote from: EEVblog on February 20, 2015, 12:27:58 amI agree. You have to start somewhere and 100MHz is enough to begin with. My first oscilloscope was an 20MHz analog one and it served it's purpose well. Back then I couldn't not have dreamed about getting something like a Rigol 1000Z series as a first oscilloscope.

author: rob77
author_rank: Super Contributor
timestamp: February 20, 2015, 01:44:40 am
content: actually the 1000Z is so good i had to buy itbought it, asked rigol for a new firmware (had the jitter issue, but wasn't that bad as others had here) updated it and i'm more than happy now.my other scope (hantek DSO1102B) is somehow less utilized nowi love the speed of the 1054Z, it's awesomethe hantek is a good scope as well (and it's battery powered and portable - no mains earth on bncs), but the user interface is "dead-slow" while acquiring with long memory.the 1054Z is pretty fast with even more memory, actually it's the fastest scope in it's price category.so definitely the Rigol 1054Z is the best choice as a first scope.

author: Fungus
author_rank: Super Contributor
timestamp: February 20, 2015, 09:20:24 am
content: Quote from: Wuerstchenhund on February 19, 2015, 10:14:15 pmIf we're being pedantic thenNOoscilloscope can reproduce a square wave.If we're being sensible, I go along with Dave: Anybody who's asking this question doesn't need more then a DS1054Z.

author: dom0
author_rank: Super Contributor
timestamp: February 20, 2015, 10:19:19 am
content: Quote from: Fungus on February 20, 2015, 09:20:24 amAgain, nope, guys, get your stuff right. Every signal above the noise in the universe is band-limited, and especially every signal on your workbench.You're right, though,that you probably don't need XXX MHz bw in your first scope.But if you read the thread again you'll see that it wasn't the question at that point. Someone said "How much bw for square wave of 20 MHz? 200 MHz, right?", someone else said "Nooo, you need 200 MS/s, not 200 MHz bw". This led to my post above.

author: Fungus
author_rank: Super Contributor
timestamp: February 20, 2015, 11:00:01 am
content: Quote from: dom0 on February 20, 2015, 10:19:19 amOK, that was a bit of a brain fart. 200MS/s is on the low side for a square wave. You'd see the signal but not much detail.What I meant to say was that the "10 to 1" rule he mentioned applies to sample rate, not bandwidth. ie. The 1GHz sample rate of the 1104Z is what lets you see a 100MHz signal with useful fidelity. You're right about not being able to see a 100MHz square wave though.

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: February 21, 2015, 01:35:35 am
content: how about this only 16 hours left?!!! I knoW ITS 80S BUT 500MHZ 1g/S? iS THIS JUNK COMPARED TO A HANTEK OR RIGOL?

author: rob77
author_rank: Super Contributor
timestamp: February 21, 2015, 08:00:30 am
content: Quote from: rwgast_lowlevellogicdesin on February 21, 2015, 01:35:35 amas a first scope... yes it isthe rigol has far more useful features than any 80's scope (intensity grading, advanced triggering, protocol decode...etc). and don't forget that 80's digital scope will have few kilo points memory only - modern scopes got several megs of memory. and as a special bonus the rigol 1000Z has a built in HELP with explanations of various stuff - extremely useful for young playersin short: as of today, the 1054Z is the beginner's "oscilloscope jackpot"p.s. i'm not related to Rigol in any way... they just nailed it to the cross with the 1000Z series.

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: February 21, 2015, 09:16:01 pm
content: Well in case anyone is intrested I bit the bullet and bought the rigol 1054z from Tequipment I noticed it was on sale with thee eevblog discount you cant beet 375 for a 500 dollar scope! And I am truly excited about the help functions!

author: rob77
author_rank: Super Contributor
timestamp: February 21, 2015, 09:39:48 pm
content: Quote from: rwgast_lowlevellogicdesin on February 21, 2015, 09:16:01 pmcongrats !now upgrade the firmware (you need to fill in a form on Rigol's website in order to get the firmware upgrade - they'll mail you a link to it) if your firmware is not SP4 already.and then if you wish (only after your firmware is the latest one)... google for "riglol" to get some free lunch(no, it's not a typo)

author: N8AUM
author_rank: Regular Contributor
timestamp: February 25, 2015, 01:24:42 am
content: I agree. You have to start somewhere and 100MHz is enough to begin with. My first oscilloscope was an 20MHz analog one and it served it's purpose well. Back then I couldn't not have dreamed about getting something like a Rigol 1000Z series as a first oscilloscope.My 1st scope was a late 50`s Heathkit, couldnt measure DC but did the job for troubleshooting radios & TV`s.I sure miss staying up at night waiting for the test pattern LOL !What channel is that on now days ?

author: Fungus
author_rank: Super Contributor
timestamp: February 25, 2015, 11:21:09 am
content: Quote100MHz? Kids today...Quote from: N8AUM on February 25, 2015, 01:24:42 amI've still got my first 'scope: Single channel, 10MHz bandwidth, tiny green screen.I found it in a store room clearout when I was at university. They told a couple of us to just throw out everything in the room. Most of it was old ring binders piled up on ancient desks but there, hidden underneath it all, was a Hameg HM307 still in its box.http://www.hameg.com/downloads/man/HM307_english.pdf(with schematic!)(Yes, it still works perfectly)PS: My focus knob has gone missing. It's not broken, there's still a little plastic post sticking that the knob fits onto. I can turn that OK but it's fiddly and it would be nice to have a proper knob. Does anybody know where I can get one?