I was recently gifted a Tektronix 2235 and just finished this first video and wanted to say thank you so much for a easy to understand approach. I actually take notes in a graph composition notebook. I'm 53 and wish I started sooner but I am doing it now. Thanks again.

@solodolo6018

8 ай бұрын

Better late than never!

What a great introduction. Thanks a lot for taking the time to do this.

Thanks so much for taking the time to do this series. Extremely helpful for the likes of myself who hasn't used a scope in more than 60 years. Best wishes to you and your family for a healthy, happy, and prosperous new year.

Thank you! I've learned so much from your videos. You make electronics so much clearer for this old knuckle dragging retired Soldier.

Probably the best YT video I've seen on any subject matter. I can't wait for the rest of the series...thank you.

Simply the best presentation on the How, What and Why of an Oscilloscope and accessories for the audio bench. Straightforward, practical and understandable. Mark you're the best! Thanks for sharing your expertise and time. I am getting back into vintage electronics and have discovered your videos as my main source of education. Thank you. Thank you. Thank you!

My man. I just love your channel so much. It's packed with such useful, practical and well presented material. I'm fairly confident that you're content has put a lot of bread on the table for mini folks and I hope you're being well supported by them.

Been in electronics for 50 years and just learned that I can still learn new things. I have the same isolation xfrmr and never thought to plug in a power strip. I am going to do this and paint it red and next to it the other will be it's natural silver. Great tip.

Mark - looking forward to the rest of the series. This will help reinforce what I already know - really appreciate it !!! Ron

Perfect, it's the last bit i have to aquire to begin the real work on the audio signal. I've been playing too long with swapping parts now it's time to really see what they're doing in the circuit. Thank !

Wow! What an incredible series of videos. Was absolutely critical in helping me trouble shoot my preamp restoration safetly!

Great video Mark!!! It may also be worth mentioning to the audience, that Variacs (Autotransformers) are not isolation transformers. Many people think they can double as such. Also, an isolation transformer, although electrically isolated from the line and neutral, is not necessarily isolated from ground. If you are going to use a 1:1 transformer for ground isolation make sure you check that the line side and load side grounds are not the same point electrically. For some, this can be fixed by a simple removal of a ground strap connection or snipping the ground prong on the line-side plug. I have a Tenma 72-1095 Isolation Transformer with adjustable voltage and it has a common ground. The load side plugs are connected to ground via a ground wire to the chassis. Disconnecting this wire isolates the load side. Just something to think about. Thanks!!!

I can tell that you have many years of experience and knowledge of electronics as you explain things so well. Even though I use an o'scope and sig gen for radio tinkering, I do use audio frequencies when aligning radios. So, your video is very helpful to anyone contemplating purchase and use of an o'scope and a signal generator. Thank you very much.

Those non-inductive wirewound resistors typically have the wire wound in both directions, which results in a relatively low inductance. Not zero, but close. Unless you're taking really low distortion measurements, it's probably not critical to have it be ultra-low inductance. After all, a speaker is somewhat inductive. It is definitely worth getting four resistors though, because you want to be able to test into 4 ohm loads.

Just what I was looking for straight forward info on what's needed. Thanks looking forward to the next video.

In ancient times when I worked at Tektronix, I used a 464 analog scope (I think that was the model). I learned to use it very well and loved it. A couple of years ago, I purchased (used) a Tek TDS420A digital scope with CRT display. Someday I might get it figured out. Like you, I grew up on the analog scopes and am struggling to get up to speed on all the menus, functions, etc., that my digital scope had. I just need to live long enough!

One hour videos plus would be great with precise details photos and part numbers is exactly what we need.

Love this series. Thank you. Concerning the channel selection buttons on that Rigol, that's why I won't buy a Rigol and will be buying a Hantek DSO2D15 which has individual controls for each channel and an internal arbitrary waveform generator. It will be an addition to my Tek 465 scope and if I ever get around to repairing them, my two HP 1741A scopes.

Perfect Part1 Explanation! Looking Forward To The Next Four Episodes!

I have and use the exact same isolation transformer you have, and use a power strip out from there for everything, including the variac and sometimes a DBT. I just got one heck of a deal on a brand new Tektronix TBS1104 Digital Oscilloscope: 100MHz, 4 Channels, 1GS/s sample for a mere $600. They sell for over $1900 on most places like Mouser. Santa was good to me. lol! The 4 channel is great when servicing quad amps and receivers. The old analog BK 2120 20MHz scope serves the purpose quite well and will not be "retired" any time soon and will be used on a 2nd bench. The Lab-Volt 1236 AF/RF generator works quite well for audio too. Awesome videos Brother!

Perfect timing... already have much of this equipment, but just learning to use it with audio equipment.

@JohnDoe-bf1fw

3 жыл бұрын

Is your dog part Chihuahua? Best way to learn electronics is in college. DC, AC, Electronics 101 to 103. No time for college? Then learn: Ohms Law, kirchhoff Voltage and Law, Thevenin's Theorem Albert Malvino "Electronic Principles" is a really good book. Hook up the example circuits in each chapter and test them with your equipment. You will soon be designing your own audio amplifiers using discrete components.

@garthhowe297

3 жыл бұрын

@@JohnDoe-bf1fw Actually, I have a 3 yr College degree in Electronics... but didn't work at the component level for long, and don't recall doing much related to AC, other than motors and such. My dog was a Welsh Corgi.

Started research on testing amplifiers with o'scopes and found this, awesome video series. Thanks!

I learned SOO much from your videos and I play them over and over again to let it sink in. Thank you very much 😀

Since I'm a tube roller guess I'll comment. First of all love your channel thanks for all the info. I just won't work on the amp when it's plugged in. I power the amp down, move my connection, then power it back up. Takes longer but it's a safety step I won't skip often. Also people with isolation transformers need to know they can't use test instruments that way and they are grounded if nearby. Which means also you could touch the ground on the oscilloscope lead when you hook it up to your amp. It takes very little current supposedly to kill a person. Having the amp turned off when moving your connection isn't ever mentioned. The 1 hand rule is impractical. You eventually will inadvertantly have 2 hands in your amp. You can see powering the amp down doesn't take that long. If Working on it powered up MUST wear insulating gloves such as latex, and only one hand if possible.

Today I found a signal generator and nice HP tube screen Oscilloscope 100MHZ in our local electronics recycling - . the generator has a gear inside broken so that has to be fixed (it can't dial to the comb filter) I think it's a simple fix.. and the HP fired up perfectly and your 3rd part video got me dialed in an confirmed. I'm SO happy to have found these today. I agree with the bench space thing. and I have a spot on the bench for this... my first non computer based osc. Appears my HP has pretty much all the same features as that Tektronik minus 2 less channels - 100MHZ is overkill for audio so that's all good ! I had to jerry rig an adapter..will order one of those packages from amazon you showed. Looks great for $20. I can see some great use out of the modern digital units.. but I too hate accessing so many menus. I'm more of a tactile operator. I can hunker in to the 'interface'..but would prefer not to.

The only reason that I pick a digital oscilloscope due to weight and size. Great video

Excellent as usual, great delivery, very straight forward and easy to absorb and understand... Looking forward to the remaining videos....

I will definitely be tuning in to this 5 part series. Thanks in advance for doing these in depth videos.

Good introduction. I too am an analog scope guy. Used 10MHz Philips scopes in college (up in Canada). One of the most overlooked scopes on the market is a Tektronix 2236/2236A. It should be cheaper than your 2246. However, it has a pretty interesting built in frequency counter, and time measurement functionality and multimeter that can be slaved to channel A. I think the frequency counter is 8 digits, and it it a 4-5 digit multimeter, and there are separate inputs for the multimeter if you want to do voltage, resistance, and continuity tests. I think it can also do external frequency tests, but its been a while, so I'm not sure about that. The scope will put meaurement lines on the screen when the multimeter (for measuring Vp-p or Vrms) or frequency/time (just like the 2246 does). Neat part is that the multimeter/frequency counter is slaved to the oscilloscope channel, so the readouts are based on the vertical and horizontal settings on the scope, so no need to do math, or count graduations and then multiply. As far as I know, the frequency/time functions work to the entire bandwidth of the scope (100MHz), as does the multimeter, and I'm pretty sure that the Vrms is True RMS, even to 100Mhz. I bought (leased actually) 25 of these Tektronix 2236s for the computer factory that I used to work at. We were constantly buying Fluke meters, and they would constantly disappear. Because I was working as a test technologist at the time, my boss asked me to find a solution to the "multimeter growing legs and walking away" problem. I looked a locking the meters up, tried it, and they still disappeared. I tried to get people to sign them in and out, and they still disappeared. So, I tooke the remaining multimeters off the production floor, and changed all the scopes out for Tektronix 2236s. No more missing multimeters, and the techs all found the scope's ability to do time/frequency measeurement a great benefit. Reliable, solid, and typical good Tektronix quality at the time (late 1980s to early 1990s). The HP 172X and 174X scopes were great too, as were some of the Philips (anything without the LCDs and non-digital) and Kikusui scopes (COS series). Never used the Hitachi scopes. And by the way, the Tektronix 2465 series, while ridiculously overpriced these days, is probably the greatest portable oscilloscope ever made. I had one on my bench for over 5 years, and it was a joy to use, and a real advance on the previous scopes that went before it.

This is a great start for a series of usage with oscilloscopes. Loving it so far!

This is fantastic! Looking forward to the next 4 episodes.

Great video and good advice. Be sure to also get 50 ohm BNC terminators for your scope inputs to assure that you'll see correct voltage readings from your signal/function generator.

This is going to be a Good few videos ! Yes please !

Great video for beginners like myself. Tube stuff isn't my bag. This video is very informative and educational. Thanks for sharing your thoughts.😁

Thank you. I watched episode two before one and asked whether analog or digital and was told to watch episode one. Glad I did. Great explanation. I am definitely looking forward to the rest of the series.

Very excited for this series. Been watching your videos for a while now and you are great at explaining what you are showing. Thank you for the time you put into everything you provide us hobbyist with. Happy New Year

Thank you for your time, knowledge and sharing your valuable experience. Very comprehensive thus far.

I'll sure be following this series. I was given 2 scopes some time ago but not even looked at them, don't even know if they work. Gonna dig them out soon and get my self familiar with them.

Thank you for educating me on functions on oscilloscopes

i used a tek 545 for years and it was a great 33mhz scope with interchangable vertical plugins. In the late 80's that was getting dodgy so I replaced that with 35mhz dual trace Hitachi scope, it was functinality similar to the old 545 and easy to use. The 545 is long gone, the Hitachi is still working great. I 2011 I got a good deal on a Tek 2230 storage scope that is a 100mhz analog scope with a digital overlay and waveform storage. I used a scope like this for years in my real job so i was very familiar with it. I can now display 4 channels on the odd chance i need to do that by using both scopes but that almost never happens. The digital capture comes in handy if your going through parts trying to select something with known risetimes. The modern digital bench scopes are interesting but you should be able to find a good analog scope for a good price and as a bonus you can probably fix it yousrself, if a new digital scope dies it has to go back to be fixed and will be gone for weeks or months and cost a lot to repair. As to the ability to display measured values on the screen i find i can do the math in my head faster than what it takes to set up the fancy scopes.

I haven't finished watching yet but this is GREAT info. Thanks so much for taking the time to put this presentation together!

A thing to keep in mind when purchasing a scope, is how deep is your bench? The older ‘tube’ based scopes, are considerably deeper to accommodate the tube compared to the likes of the newer digital scopes like the Rigol which are the opposite!

@SinnerSince1962

11 ай бұрын

I agree whole heartedly. Sadly, because I'm so "old school", I love my Tektronix 2246. I know every button and knob, and like having discrete controls. I do have a Siglent 1104x-e, but haven't come close to mastering it's capabilities nor it's menu system. I also have an HP-54610b with it's memory module, which is an awesome piece of gear.

Thanx! Exactly what I’ll need when I get around to buying a scope!

Looking forward to the rest of your series. Started my tech bench about 2 years ago and went through this entire process without as much guidance. The one area that stopped me cold for a bit was the stupid and mislabeled isolation transformers on the market. Very few are actually isolated. I am not referencing a Variac. They almost all tie the ground blade to the round ground plug that you are expecting to isolate from. I had to learn how to modify a new one by changing out the type of plugs on one bank (there is a special type of isolated outlet plugs you can buy) and removing the round pin ground connection that was originally connected. Everyone that checks their isolation on almost all of these newer ones will be surprised to find they have continuity to the any other wall outlet ground pin. They apparently can call it isolated still because it uses a transformer. It doesn’t have anything to do with ground isolation anymore. Your older isolation model or use of 2 prong adapters is the easiest method to go by.

@johncasteel1780

Жыл бұрын

Agreed. Isolation transformers are sold with safety in mind. The problem, as you stated, is that many iso transformers are not true isolation transformers. You *cannot* blindly trust your life - or test equipment - to an iso transformer. There are a lot of gotcha's involved. You *must* test the thing. Corollary - You must know how to test it.

I can't thank you enough for this video! I can't wait for the rest of them!!!

I want to get into amp repair, pedal repair, modding, building, etc. This video seems very helpful, thank you! 👍

Great intro series for new learners and old dogs too. Those old 10 to 20 Mhz scope will serve one well, I saw 100 Mhz scopes for as little as $50 dollars a afew days ago on the web.

Thanks Mark. It is about time some body explains this with practical applications. I learned this 40 years ago with out applications. Education is such a bitch. When you get your amp class setup, done I am in. Will see youall in the south..

Excellent excellent excellent. Very informative and practical. Just was a person trying to learn about electronics needs. Thank you.

Great value video series Mark. I already learned so much from you and have turned it into practical use. Looking forward to the next video’s.

Thanks for this. 1st episode was very informative and well paced. I look forward to viewing Parts 2 through 5.

I had to subscribe again ! I learned all the hertz stuff in the Radio Shack books "AC circuits part one and two". Killer books

Very good video, sir. I've ended up with several 'scopes ranging from a late 40s lab model through a dual channel Heathkit c.1970 up to a 100 MHz Techtronics. For audio use on my radios I use the Techtronics or another 10 MHz scope (tube equipment) or one of the cheap DSO138 or DSO150 units from eBay/AliExpress/Bangood for solid state equipment (these are roughly $24 - $30). I have used the DSOs fed through a capacitor for some boat anchors. I plan on closely following the remainder of this series. Thanks.

Thanks! Excellent overview of connector basics and oscilloscope basic and setup up for scope operation. Much appreciated!

I already own an several oscilloscopes but I enjoyed the video and plan on following along so I can pick up new info as you progress through the lessons.

Great series. Really informative and motivational! Keep them coming. Fan from Chicago.

Excellent tutorial. Answered a lot of my questions. Links very helpful. Thanks

Thank you for this amazing video!!! THANK YOU

Thanks so much for doing this series! Your channel has given me the tools I need to get into building my own tube amp :)

Best of the Holiday wishes to you and yours! Very excited that the O-scope series has started (especially looking forward to the safety part).

Perfect Timing. I am looking to purchase an Oscilloscope for various Guitar amplifier and pedal builds. Looking forward to watching the series....Thank you.

Awesome Part 1. Can’t wait for the rest of them!

This is just great! Thanks, Blueglow Electronics. An extra thank you for not saying "one Hurt, two Hertz" :D Most Americans I've heard on KZread confuse things that way.

@gwbenites

2 жыл бұрын

I admit, I'm American and just reading comments in most of my subscribed channels is usually frustrating, and honestly embarrassing! As you've probably figured out, our education system is surely lacking, and it must really make Europeans and Asians cringe! I love my country, but we fall way behind in education. ✌😵

Thank you so much for this video series! This is the info I have been looking for.

Great start to an exciting series

I don’t think anyone else has mentioned it, but a nice thing about modern digital scopes is that you can capture quite of lot of waveform data and then analyze using math software like MATLAB or Octave. Plus it’s way easier to capture images of waveforms of interest for documentation. I humbly suggest people start with an inexpensive digital scope and get good using it. They are small and portable, which is nice. Then graduate to a good analogue scope like the Tek. I use both kinds for all my work. There are some things that my Tek is better at, some thing not.

Very glad to see you do this series! TY!

This is a very helpful video series, I was searching for something like this long time up to now, I respect your work and your time to make this educational video. Thank you!

OUTSTANDING video! I appreciate all your effort to put this together!

I use Tektronix 2213A analog oscilloscope. I bought it brand new 35 years ago. Make sure the scope you get is in perfect condition and freshly calibrated. If you get some old junkie military surplus unit, you may spend more time working on the scope then on the circuit you are experimenting on. Also: DO NOT CONNECT YOUR OSCILLOSCOPE GROUND LEAD TO A HOT CHASSIS. IF YOU DO, ZAP!

@williamstevens7090

3 жыл бұрын

I picked up my Tek 2213A only this Summer. I was new to o' scopes and was surprised how easy it is to operate.

@JohnDoe-bf1fw

3 жыл бұрын

@@williamstevens7090 Way cool ! I'm sure you paid a lot less than I did. My Tek 2213A was $1,400 in 1985.

Thank you!

Greetings: FYI: As far as I am concerned, all RCA type connectors are to be called "phono" types. They all are single signal (plus shield). They have been around a long time and were originally used to connect the first phonographs with electrical pick-ups to tube radios equipped with a single RCA connector to use the radio's amplifier and speaker to listen to 78 rpm records that had once been played on wind-up gramophones. All tip-ring-sleeve audio connectors owe their heritage to the original plugs used on telephone switchboards, hence "phone" connectors. Although those first phone plugs (and jacks) were three connector types, the audio industry standardized on them for patching including use for balanced signals. My first exposure to tiny plugs/jacks were as earphone jacks on transistor radios. Some were smaller than the common 3.5 mm plugs used today. But all are deserving to be called "phone" plugs. BTW: in Europe RCA phono plugs are often referred to as CINCH plugs as CINCH JONES is/was a major manufactuurer of them. (Plus there was some resentment against the Radio Corporation of America for their tight-fisted use of patents to suppress competing radio makers.) I do not know if RCA ever manufactured their own phono connectors or just used some else's patent ;). Hope this helps. P.S. The original use of the 1/4" stereo headphone jack was an outgrowth of the use of 1/4" monaural headphone jacks on mono hi-fi gear. The use of phono connectors on audio/video gear is likely due to their smaller panel space requirements.

I can add a little info on vintage scopes as I have just done some research and testing for model railroaders who might want an oscilloscope for measuring the "Digital Command Control" voltage but don't want to spend much. (Plus, I have used such scopes in my mercilessly long career.) One thing to remember is that the major manufacturers each had a range, often a very wide range, of oscilloscope models and usually the bottom of the line would be fine for audio. But on the used market, there tends to be far less of a price spread between models and manufacturers than for the original price spread. The Tektronix 465 mentioned (or you might be more likely to find the 465B) was a top line oscilloscope (the industry standard, actually) introduced in 1972 for $1,725 ($11,470 in 2021 dollars) sells on eBay for $100 to $250. A Tektronix 2215 introduced in 1982 for $1.400 ($4,032 in 2021 dollars) sells used for $50 to $150. A Hitachi V-212 introduced in 1983 for $340 ($949 in 2021 dollars) sells used for $50 to $120. Of course, offerings vary in condition a lot, but you can get a very nice vintage scope for so little money that the biggest concern might be the shipping cost and perhaps having to buy some probes. If buying a new digital scope, typical names today for bench scopes are Siglent, Rigol, Hantek, and some others. (I recently got a Siglent SDS1202X-E and think it is rather decent.) KZread reviews abound on new scopes but beware that some reviews are by some who are not very knowledgeable and some by those with decades of electronics training and experience. While the lowest bandwidth models are adequate for audio, it often doesn't cost very much more to get much more bandwidth and perhaps more features. Frankly, the options today for low cost oscilloscopes made in China can make you feel like a kid in candy store. Some scopes I would NOT recommend are the "mini" DSO's or "Tablet" oscilloscopes. While usable, most wildly exaggerate their bandwidth and can be annoying to use with minimal controls and maximum menus so you are forever cursoring, cursoring, and cursing to make changes. Also, even the lowest end mini-DSO (200 kHz claimed bandwidth, but not really) is about $75 and if you step up to a better model and you are above $100 pretty easily. They just aren't a good value in my view. They are the sort of thing that, if want to use it regularly, you live to regret. They do have the advantage of being battery operated, however, which certainly takes care of isolation issues.

Grate video Mark looking forward to the next one

Really good,very interesting ,thankyou

thanks a lot for this serie of videos

For basic audio work, there's a cheap Chinese unit that Dave over at EEVBLOG did a review on it, he didn't like, probably wasn't up to what he might have used it for but someone else did a great review on it, I think that it was the learn electronics channel, it's got a built in lithium battery and a 7" screen, has FFT and covers the audio frequency range! Because it's not plugged into the mains, it's isolated and being extremely portable you can use it on your car if the need ever comes. The brand is FNIRSI, has two channels and is touch screen! It does have menus but no where near as much as other scopes! You will find that the touch screen works really well to. But the price for what you get just can't be beat! It's battery is charged by usb and it's battery can be upgraded to something much larger if 4 or 5 hours isn't enough! It's actually built very well and feels very professional! It claims that it can measure really high frequencies but it can't, but for 0hz to 50kz, you will be covered, it can go higher but I only use it for audio, displays voltage and other data along the bottom of the screen which you can pick and choose which data you want and both channels data can be independently chosen! It's not as good or featured as a Rigol but it's almost half the price! For getting started in audio, I think that it's perfect! I also have an older CRT scope which doesn't do any data and I even got one of those tiny little all aluminium cased two channel scopes, it's also great just for audio but it's tiny 2.5 or 3" screen isn't something that you want to be starring at every single day! It's great to drop into your shirt pocket and go for a quick once in a blue moon but definitely not every day! So yeah, I think that the FNIRSI is definitely worth it if it's in your price range and you are only working with audio! If this unit becomes popular, I'm sure that the next model will have improved performance and features! I love it ❤️. I got mine from eBay but it should be also available on Amazon to... Check it out!

Thanks Mark - Great to see you up and running with the Scope series - good introduction - Tick box checked . All the best to you and your family over the festive ( be it subdued) season, stay safe .

Thanks for the video, looking forward to the rest!!

Great video. I picked up a BK 1474 for $50 Canadian!

Class !!! but a good multimeter is need too .... a precise of coarse !!! Happy good year Eric from France

@JeffCounsil-rp4qv

3 жыл бұрын

And it pays to get a good quality meter. Although the "cheapos" do work, they don't work very well after a while and will become intermittent from oxidation on all the contact areas. Areas like the switch contacts and probe sockets where you have to "wiggle" them to regain non-resistance contact. I finally went with Fluke when I could afford them and never looked back. There are other "top shelf" brands as well. I still use my "cheapo" meters a lot for things like "quick" checks and the like to save wear and tear on the Fluke meters.

Love it!!! Thanks so much for putting this series together. Been wanting to go beyond the basic obvious repairs. An oscilloscope is something I've always wondered about, so thanks again for this series and I'm really looking forward to seeing the rest of them.

Can't thank you enough for this video and the accompanying series! Saved me tons already, as I am just starting out with this hobby! SUBSCRIBED!

great video I have been thinking about starting to learn how to fix my vintage gear for awhile now . Thanks for the info to make my mind up and start gathering the things I need Great video and thank you very much

I'm already looking out for the follow-up videos. Nice work. I wish you and your family a peaceful New Year and a healthy 2021

Great video. Straight to the point and easy

thank you for sharing

Very practical information. Thanks!

Wow bud.. really appreciate you making these.. thumbs up for sure..

Thanks so much for this series !!!

I settled on the Hantek DSO5072P two channel, 70MHz digital oscilloscope and a Koolertron two channel, 60MHz arbitrary waveform function generator. I still want an analog scope with XY mode so I can experiment with oscilloscope music some time in the future (music that displays fantastic images on an oscilloscope in XY mode). Cheers!

Thanks Mark brilliant introduction. I know very little about audio but I do repair and collect test gear. Just opinion but I wouldn’t buy any old scope TEK or HP unless it was a complete steal of a price most of these old scopes are well into the age where they start failing. I wouldn’t invest 250 in an old analog scope when I can buy a Rigol for a similar figure new with warranty. Many of the new digital scopes will also be able to THD and other distortion measurement. Someone below made a good comment about the maximum volt per division being generally much lower on a modern scope. I would stay away from the very cheap signal generator the output are horrendously noisy but ok if your paying a reasonable amount of money. Lots of good old AF signal generator around on eBay with very low distortion. I think you should also add an audio isolation transformer to your list. I found this essential very quickly but that could be because i work on a wide range of equipment. But it’s easy to short out an amplifier and set up ground loops via the signal generator and BNC screens etc. Great video really looking to the other parts as i interested in learning about audio measurement. Please make sure you cover impedance and typical units such as dbV and dbU and how manufacturers specify audio performance. Probably teaching you to suck eggs now sorry but excited to watch the future videos in this series. Best wishes to you and the family. My best regards. Chris

@Blueglow

3 жыл бұрын

Oh lord...

excellent tutorial and clearly explained for starters

I'm in for the long-haul !!

Very informative video, Mark. I have two very minor points. I think the preferred term for the divisions on the face plate of a crt is ‘graticules’ rather than gradients. The other is, the crt’s for the analog scope are becoming rare, and are very expensive. A replacement will probably cost more than the scope itself, if you can find one. I think this is a factor which should be considered when buying something like this, especially from ebay. You are buying an absolute pig in a poke there. The digital scopes don’t have crt’s.

@Blueglow

3 жыл бұрын

I've heard them called both so not sure what's official. On the tube screen, agreed.

Very helpful and useful information. Thank you!

Hi, many thanks for info, looking forward to next video.

I own a Yamaha CS30 synth and have been looking for advice on oscilloscope buying just to check waveforms etc. pleased to find this.

Excellent beginning! Really looking forward to your coming videos. Just a few observtions on isolation: Your slide that showed some isolation devices was useful, but there was a something that said a Variac is not an isolation device - something you didn't mention or go into at all but I suspect you'll cover in your next video. Since your coverage is scopes for audio bench work may I suggest you consider expanding on the initial 5 topics currently and perhaps cover areas such as harmonic distortion measurment, inter-modulation distortion measurment, etc. As a side note some of the digital scopes can do BODE plots which are great for frequency response (and phase response) analysis of a DUT. Another related area you might want to consider is spectrum analysis where you'll inject a sine of known purity and see what the DUT does to it on its output - this was a common procedure done with audio amps and preamps when the Hirsch-Houk Labs used to be a regular part of Stereo Review magazine back in the days (I'm dating myself). As you mentioned in the video you're looking at a Keysight model for around $1k for your own use. There are also some from Rigol and GW Instek that can do BODE plots. If I'm not mistaken the Rigol requires an external waveform generator where as the Keysight has one built-in to the scope .. I think. However, in particular the GW Instek 2000E/G series MDO (Mixed Domain Oscilloscopes) have a built-in dual-channel Arbitrary Waveform Generator (0.1 hz to 25 MHz) and with free software from Instek for the 2000E/G scopes can perform a BODE plot. The 2000E/G series MDO scopes also have 1 million point (selectable) FFTs - something you don't find on most other low-end and mid-range digital scopes. And as if that weren't enough, the MDO 2000E/G series have a built-in separate Spectrum Analyzer where span, center point, window type, etc. can be dialed in like a stand-along spectrum analyzer. The "E" version of the series also has a 5000 count Digital Meter (and a 5V/1amp power supply if you're into design). For audio work the MDO 2000E/G scopes are a fantastic combination and you might want to include using one of them (they come in 2-Ch and 4-Ch varieties and span a total of 12 models) in one of your future videos. I should mention I am not connected with GW Instek in any way, but I have been looking for a scope to do more than just the usual and after comparing their scopes to some other brands/options the Instek MDO-2000E//G seem to give you quite a bang for your buck, so I purchased their MDO-2104E (100 MHz, 4-Ch) for my audio work. Looking forward to your next videos!

Great series! Thank you for your hard work!!!!