hybridfree/eevblog-posts huggingface dataset:
Oscilloscope reading high  - Page 1
Forum section: electronics / beginners

author: PythonGuython
author_rank: Contributor
timestamp: August 20, 2020, 06:12:14 pm
content: Newbie here,I recently got a siglent SDS 1104X-E oscilloscope and a siglent SDG-1032x arb gen. I've been testing them out, and the oscilloscope is consistently reading higher than it should. I had the function generator outputting 6 Vpp and the oscilloscope keeps reading 6.4 Vpp. This isn't a HiZ issue, or a 10x probe issue. My multimeter is reading the proper Vrms. I even ran the signal through an voltage follower and i still reads high. Do I need to calibrate an oscilloscope out of the box?

author: rstofer
author_rank: Super Contributor
timestamp: August 20, 2020, 07:42:14 pm
content: After the scope warms up for a hour or so, you can run the internal calibration procedure. Read your user manual for details. On the Rigol it is as simple as disconnecting all the probes, pushing a button and waiting for completion.

author: CharlotteSwiss
author_rank: Frequent Contributor
timestamp: August 20, 2020, 08:54:28 pm
content: in my 1202x-e there are two Cal functions to perform (recommended when the oscilloscope works at a different ambient temperature than usual maybe). See if they are in yours too

author: tautech
author_rank: Super Contributor
timestamp: August 21, 2020, 08:01:04 pm
content: Quote from: PythonGuython on August 20, 2020, 06:12:14 pmWelcome to the forum.No you don't.What measurement type are you doing ?Grab a USB screenshot from the scope using the blue Print button and add the png image into the Attachment box when making a reply.Then we can see your scope settings to replicate them if necessary.

author: nigelwright7557
author_rank: Frequent Contributor
timestamp: August 21, 2020, 10:48:19 pm
content: Quote from: tautech on August 21, 2020, 08:01:04 pmthe analogue side uses fast op amps and high tolerance resistors so should be spot on.maybe got a faulty scope ?give them a ring.
Oscilloscope reading voltage when probe is sorted. - Page 1
Forum section: electronics / beginners

author: RoadRunner
author_rank: Frequent Contributor
timestamp: February 20, 2022, 04:00:17 pm
content: I have Rohde und Schwarz RTB2004 with vertical specification attached as per image.When I turn scope on it is is reading about ~300mV on instrument's DVM when turned on. But it settles down to around 20mV on 2V/div range (Total 20V full scale on screen), after one a minute or two of operation.All channel have similar behavior. All read few hundred millivolts initially and then slowly settles down under few millivolts.This value of a constant offset seems to be variable depending on range vertical setting, it is in uV when scope is set to 1V/DIV or less and reading around 500mV when scope is set to 50V/div (500V full scale.My question is, Is this normal, If yes Which specification of scope defines it. Is this what called "Zero error"?In Attached image you can see screen shot of scope, all channels are at 0V offset but they are not perfectly over one another. Is this normal?

author: Caliaxy
author_rank: Frequent Contributor
timestamp: February 20, 2022, 06:48:12 pm
content: Not sure about the warm-up time, but 20mV for 2V/div seems under 1LSB (the ADC full range should be wider than the max 20V range that fits on screen, so 1LSB should be < 20,000mV/2^10 bits). I don’t think you can get much better than that.

author: RoadRunner
author_rank: Frequent Contributor
timestamp: February 20, 2022, 09:18:30 pm
content: Thank you all of quick answers, I assume its normal. I was little worried when offset appeared on specific ranges. I guess may be way too large screen of instrument is also a little culprit showing even small changes.Regards

author: tautech
author_rank: Super Contributor
timestamp: February 21, 2022, 07:28:25 am
content: QuoteDo you mean shorted ?If so, how ?Let's say you've connected the probe reference (gnd) lead to the probe tip, if so you've just made a fine little RF loop that will collect close by interference and feed it into the scope. From boot some scopes have a cold auto-adjust feature which could null any minor interference out and have measurements return to an apparent normal.Remember firstly probes are designed to collect and convey signals to the scope even if there is no apparent connection where for sanity checks you'd be better advised to use input Ground coupling to check for any measurement offsets in a scope.

author: Damianos
author_rank: Frequent Contributor
timestamp: February 21, 2022, 11:25:05 pm
content: When testing for input offset, short directly the inputs or remove everything from them (probes, cables). Allow the device to warm up and recheck. Also, after warm up, run the "auto calibration" (or whatever it is called), especially if there is a big temperature change (of the environment) from the previous calibration.
Oscilloscope reading wrong with 10X - Page 1
Forum section: electronics / beginners

author: enly1
author_rank: Newbie
timestamp: August 25, 2014, 08:28:58 am
content: Hi All,First post, so please be gentle.I've had a Rigol DS1074 as my first scope for a little while now (few weeks) and have generally got the hang of everything I've needed so far, but came unstuck today and not sure what I am doing wrong.I have a custom PCB which I have up and running which is for a motorcycle bluetooth data logger which was 2 power feeds. A USB feed and an unregulated input both routed to a LDO reg.These two sources are both protected by some 30-40V diodes to control current flow for whichever source is not connected / lowest voltage etc.So now my problem - with the Rigol in 1X probe mode, if I measure the voltage on the protected side of the diode, it reads correctly about 600mv - the same as my DMM. When I do the same with the scope in 10X probe mode, it reads 4+ volts. The scope has been swapped to 10X mode on the probe, but that doesn't fix it.When I read an actual 3.3V source in 10x mode - it shows a 3.3V trace on oscilloscope - so working correctly.There is no connection on the diode protected side, so its just floating wires until I connect a power source or the oscilloscope. Ground on both inputs is common.Can someone explain why the scope running in 10X mode doesn't operate the same as 1X mode (scaling aside) and why its different from DMM ?Thanks in advance as I've done enough head scratching ...Simon

author: vk6zgo
author_rank: Super Contributor
timestamp: August 25, 2014, 09:39:57 am
content: Yes,diodes aren't like a switch---when reverse biased,they have a resistance in the high Megohms.This resistance,& the 'scope input resistance form a voltage divider.The 'scope input resistance is greater in X10 mode,so the reading is higher.

author: enly1
author_rank: Newbie
timestamp: August 25, 2014, 10:12:29 am
content: Quote from: vk6zgo on August 25, 2014, 09:39:57 amThanks - still a little confused though - as its a voltage divider I would expect to be getting a percentage of the voltage available at the point being measured.As I understand - 50:50 ratio divider would divide by 2. other ratios always reduce the overall voltage by a ratio - it can never create voltage.Thinking about this as I type - if the diode is essentially a very large resistor in this state, am I'm creating a parallel resistor circuit (probe and diode) and thus reading a percentage of the source voltage and not the reverse bias voltage ?Cheers

author: con-f-use
author_rank: Unknown
timestamp: August 25, 2014, 10:23:13 am
content: Quote from: enly1 on August 25, 2014, 10:12:29 amDiode and probe do not divide the 600mV at the diode's protected side. They divide the voltage at the other side of the diode, which, if I read your post right, is at supply voltage.

author: enly1
author_rank: Newbie
timestamp: August 25, 2014, 10:35:46 am
content: Thanks for the confirmationI assume with a DMM or 1X probe in this case, the voltage reading will also be wrong, but by a different margin based on the divider ratio between diode and DMM resistance.Really useful guys - thanks alot.
Oscilloscope reads at some circuit points, not others - Page 1
Forum section: electronics / beginners

author: dbctronic
author_rank: Regular Contributor
timestamp: September 19, 2021, 07:16:02 pm
content: I'm waiting for a reply on the Pico Tech site. Many reads, no replies.I'm working with a TL082 based Wein bridge oscillator. Suddenly, the 2204A scope shows some circuit points as live, others dead. It likes the oscillator output (370kHz, 4.5V peak). After a few dead results elsewhere, I tried looking at the output through resistors. At 1k, it sees half amplitude output. Above about 5K, suddenly nothing.I tried rigging another TL082 as a unity gain buffer. Signal shows at its input but not at the output. Next, I followed the oscillator with a 1N4148 diode feeding a 0.47uF cap / 10k resistor combo. Multimeter shows expected 3.68V output on cap. Scope shows nothing. Tried hooking diode to the output of the buffer. Same result--multimeter reading good, no scope output at all. Swapping A and B scope probes shows that the oscillator output continues to be good while the signal on the other side of half a dozen multimeter-verified resistors is nada.Am I overlooking something? How can a scope probe see signal through 1k but not 5K? How not through a diode, which has an on state impedance far below 1K?Thanks in advance for plowing through this!

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: September 19, 2021, 07:59:54 pm
content: It would be helpful if you would provide more information about the settings on your scope. Like coupling, trigger level, mode, horizontal and vertical factors...

author: StillTrying
author_rank: Super Contributor
timestamp: September 19, 2021, 08:40:57 pm
content: "no scope output at all"Does that mean just a straight line trace or no trace at all.When you're probing unknowns it's better to have the trigger set on AUTO rather than NORMal, because there'll always be some sort of visible trace.How are the +V -V & GND supplies for the TL082 produced? Sounds like it's stuck at the rails.

author: gcewing
author_rank: Regular Contributor
timestamp: September 20, 2021, 07:15:12 am
content: Another way of getting no trace at all is using DC coupling and having a DC offset that's off-scale on your volts/div setting.

author: dbctronic
author_rank: Regular Contributor
timestamp: October 03, 2021, 04:43:19 pm
content: Thanks for the replies. A Pico Tech board person said that I probably had a defective unit. I have since determined that this is the case, and just today, I see that Channel A is now totally dead using three probes that all work on Channel B, no matter what settings I try, and Channel B now drops apparent signal voltage from several volts to several mV when resistance in series with the probe exceeds 350 ohms, not 4K as before. A rectifier and multimeter verify that the actual signal voltage does not drop out this way.Time to go scope shopping!! I like the 2204A, which I bought 5 years ago. Any opinions on whether it's still a good purchase at US$159 for basic beginner use? It seems to do about everything I'm likely to need, mostly monitoring a single signal at a time and spectrum analysis.
Oscilloscope recommendation - Page 1
Forum section: electronics / beginners

author: mr_glitch
author_rank: Newbie
timestamp: August 14, 2015, 06:52:19 am
content: Hi all,I'm new to, well, just about everything in this particular subject, and I'm looking to build out my work area a bit. I ran across a Gould model 1425 digital storage oscilloscope on Craigslist for $50, and I was wondering if it would be worth picking up. Looks like it's a dual trace unit with a 20 MHz bandwidth. Any opinions on this would be greatly appreciated. Thanks in advance!

author: JoeN
author_rank: Frequent Contributor
timestamp: August 14, 2015, 07:14:45 am
content: If all you can afford is $50 then any working oscilloscope for $50 is better than nothing. Is it working? Are you going to be able to test it? Bring a signal source and check it out. From what I see about that scope, it is very basic, but $50 is still a decent deal. The cheapest new scopes are around $300.One thing I will say is, based on the parts I see and lack of any real memory on this scope, the "DSO"-ness of this scope must be very, very limited. Still, if it works then it's probably worth $50.http://www.amplifier.cd/Test_Equipment/other/Gould-1425.htm

author: mr_glitch
author_rank: Newbie
timestamp: August 15, 2015, 03:27:38 am
content: Thanks for the reply. Yep, it works. I tried it out today & ended up buying it. I figured it would help me get my feet wet before I commit to dropping $300+ on a new one.Interestingly, it seems to be primarily an analog scope. In "normal mode", you just get the two traces across the screen, and it behaves the way every other analog scope I've seen behaves. You put it into "storage mode" to get any kind of digital info on the screen, as well as the ability to arm & trigger the recording function. Is that typical of early DSOs?If nothing else, it's got X-Y inputs, so in case I ever run across an Asteroids arcade board, I'll have a monitor ready to go.

author: Zero999
author_rank: Super Contributor
timestamp: August 15, 2015, 09:39:08 am
content: You got a bargain. I've seen similar oscilloscopes go for three times that on ebay.
Oscilloscope search - Page 1
Forum section: electronics / beginners

author: davefigueroa
author_rank: Newbie
timestamp: April 01, 2017, 09:52:28 pm
content: Hello there!My name is Dave Figueroa and I live in Santiago, ChileHere in my country they do not sell many oscilloscopes, and the ones that sell are VERY EXPENSIVE!, but there are some that are saved.I have this oscilloscopes that i found, and I need help to choose the best one:Instek gds 1023 - CLP$140.000 (278 AUD)Hameg HM-203 - CLP$110.000 (219 AUD)BK PRECISION 2120B - CLP$240.000 (478 AUD)TEKTRONIX 7603 with 7D02 Logic Analyzer (?) - CLP$50.000 (99,50 AUD)Gould OS-250B - CLP$60.000 (119,40 AUD)If you have a big heart and you want to donate me an oscilloscope, I will very happy!.Thanks in advance

author: tautech
author_rank: Super Contributor
timestamp: April 01, 2017, 10:02:27 pm
content: Let the availability of a Service manual help you decide which to get, personally due to the basic good design, reliability and simplicity I'd choose the Hameg from your list for a second hand CRO.

author: Lightages
author_rank: Unknown
timestamp: April 01, 2017, 10:18:25 pm
content: Hola Dave. Estoy viviendo en San Pedro de Atacama. Estoy feliz para ver un otra persona desde Chile en el foro. Bienvenido.You can buy a Rigol or Siglent from China and get them into the country at not too much more money than the rest of the world but mostly 50% higher. Unfortunately it is the price we pay living in Chile, high prices because the local rich families who own the businesses and the government don't want their huge profits to be undermined. Also, the businesses in Chile only seem to stock one or two items of good quality, but usually they are not in stock and you wait forever. They also stock old models and don't seem interested in keeping up with new models.An example:http://www.victronics.cl/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=14313&category_id=6590&option=com_virtuemart&Itemid=1It is partly the fault of Chilenos too. In Chile price is always more important than utility, quality, or if it will even work.

author: rsjsouza
author_rank: Super Contributor
timestamp: April 02, 2017, 02:53:11 pm
content: Welcome to the forum. I am from South America as well (Brazil) and feel your pain about overpriced goods...I saw the Instek listing at the chilean classified listing and it is, in fact, a GDS-1022. Out of the offers it is the only digital, which may or may not be critical for what you are doing. As Tautech mentioned, the Hameg is usually the most well built of the offers and it looks quite new on the listing. It is thoroughly discussed around this forum and has service manuals available.Unnecessary to say that you need to see them before buying, as the pictures do not show them turned on.
Oscilloscope shows 60V on lamp ground - Page 1
Forum section: electronics / beginners

author: nbritton
author_rank: Frequent Contributor
timestamp: October 23, 2015, 07:16:57 am
content: So I was just playing with my new scope when I hooked up my (ungrounded) probe the chassis of a desk lamp and to my surprise the scope measured a 60Hz sine wave of 60Vpp (+/-30V). I know induction can pickup some stray voltage, but 60V? Furthermore, the lamp and oscilloscope are plugged into the same power strip, so they should have the same ground reference and phase.What's going on here?

author: tautech
author_rank: Super Contributor
timestamp: October 23, 2015, 07:33:01 am
content: Mis-match between probe attenuation and scope input attenuation?

author: alsetalokin4017
author_rank: Super Contributor
timestamp: October 23, 2015, 08:39:31 am
content: What do you see when you just hold the (ungrounded) probe tip between thumb and forefinger?

author: Gyro
author_rank: Super Contributor
timestamp: October 23, 2015, 08:46:45 am
content: Possibly most likely is that the lamp has an ungrounded chassis (2 wire cord) and what you are seeing is leakage.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: October 23, 2015, 11:36:38 am
content: Sigh.Here's what I get from holding the (ungrounded) probe tip between my thumb and forefinger.I assure you that I am not plugged into anything, myself.

author: tec5c
author_rank: Frequent Contributor
timestamp: October 23, 2015, 12:51:49 pm
content: Quote from: alsetalokin4017 on October 23, 2015, 11:36:38 amRight, and this is what you'd expect. Due to the high impedance of the probe it acts as an antenna. So you'd still pick up the 60Hz (50Hz some countries) ambient noise even without pinching the probe with your fingers, it will just be a weaker signal, perhaps not noticeable on certain scopes. When you make contact with the probe your body is then acting as an antenna (and a better one than empty space).This is due to a capacitive divider effect. One capacitor is within the scope probe and essentially is connected from the tip to the scope ground. The other much smaller capacitance is across empty space: from the probe tip to any distant mains wires in the walls. The empty space around the probe is the dielectric of this capacitor.
oscilloscope super crusty.  - Page 1
Forum section: electronics / beginners

author: vigsgb
author_rank: Contributor
timestamp: March 10, 2014, 10:29:26 pm
content: Got my oscilloscope today and it fires up but every knob and inside the unit is packed with crust.Can I use any electrical cleaner and spray away at will?

author: linux-works
author_rank: Super Contributor
timestamp: March 10, 2014, 10:52:40 pm
content: careful teardown and cleaning is recommended.I remove knobs (take note of what goes where) and wash them in the sink with the cleaner of your choice and hot water. I use compressed air to blow off the water and make sure they dry well and don't rust.you don't want to go at the thing like a gorillaI try to disassemble the front panel (if possible, on dmm meters its not hard, for example) and then I clean the whole panel once the pcb and insides have been removed.de-oxit is the only spray I'll use (#5) when cleaning switches. avoid no-name radio shack style stuff.sometimes taking the thing outside and using compressed air is enough to clean the insides.
Oscilloscope to replace Tektronix 2012B: Bigol 1054Z, better? - Page 1
Forum section: electronics / beginners

author: genesisq
author_rank: Newbie
timestamp: December 02, 2015, 01:23:34 am
content: Hello,I'm a noob electrical engineering student who have only used Tekronix 2012B (100MHz, 1Gs/s) oscilloscope. And I'm about get an oscilloscopeat home.Several hours in the forum and watching the YouTube videos were more than enough to convince me that the Bigol 1054Z is the ONE.I was initially thinking Rigol 2072A for 2Gs/s improvement, but it's probably overkill for me just trying to build DIY stuffs like audio DACs at home.A question came to my mind after some more searching.I came by this comment from administrator Dave:https://www.eevblog.com/forum/reviews/agilent-2000x-series-vs-tek-tds2000-series/msg52080/#msg52080And I watched his reviews/breakdown videos on lower-end Tek oscilloscopes.Tek 2012B was expensive like any other tek stuff, and it's even older than the ones he reviewed.Q:Is 1054Z going to be cheaper, yet way better in performance compared to 2012B? No doubt it would boot much faster, but would it have louder fan noise? lower quality probes? I read Tek is more reliable and has better warranty, I could not find much about 2012B (3results) or even 2012C(0 results) in the forum.Thank you in advance!

author: c4757p
author_rank: Super Contributor
timestamp: December 02, 2015, 01:40:57 am
content: Oh god, anything's going to be better than a TDS1000B. From the ones I've used, I don't really see any reason for them to exist other than giving people at schools who grew up hearing the name "Tektronix" something cheap to buy for the labs...I have no idea about the fan noise, I never paid attention to that. My DS1054Z is abitloud. Never used the TDS1000B in an environment quiet enough to hear it. But the Rigol probes are fine, it boots fast enough, the interface is way more intuitive, it has much more memory, and the signal path performance is about the same.

author: Galaxyrise
author_rank: Frequent Contributor
timestamp: December 02, 2015, 01:58:21 am
content: I think you would be much happier with a 4 channel, 12Mpt scope even at 50MHz and with headphones on. I have the Rigol DS2100, and I'm pretty sure I'd be better served by having another two channels than I have been by the 2000's higher performance per channel.

author: Wim_L
author_rank: Regular Contributor
timestamp: December 02, 2015, 10:39:03 am
content: I don't think any of the TDS 1000 series scopes had a fan, so they're as quiet as it gets. Most of the newer oscilloscopes do have fans. If a new but quiet scope is vital for you, some of the slower Hameg / R&S models are fanless. They're also noticeably more expensive than Rigol.
oscilloscope to stereo receiver without damaging anything? - Page 1
Forum section: electronics / beginners

author: oscopenoob
author_rank: Newbie
timestamp: November 16, 2017, 03:16:55 am
content: Heyyo!First off, please don't hate me: I bought a Tektronix 465 simply to be a "lightshow" while I listen to music. I am not really trying to analyze anything.I cannot figure out how to connect it to my receiver/amplifier so I can listen to music and watch the oscope at the same time. I've bought a bunch of different adapters that go from BNC to different things, and the only way I can get a signal is connecting my phone through a 3.5mm jack to BNC cable, and that worked just fine. The last thing I tried was getting x and y BNC probes and splicing them to the left and right speaker wires in the middle of the signal, and all I got was "noise" on the screen.I'm pretty much lost here. My next idea is to get some BNC to RCA cables and connect it to a line level out on the back of the receiver. Would this work? Is it grounding that is the problem?Any help is greatly appreciated. Both Youtube and Google have no answers for me.Thanks a lot,Oscopenoooooob

author: jcw0752
author_rank: Contributor
timestamp: November 16, 2017, 04:31:03 am
content: The idea to come from the line out to the oscilloscope is a good one. With the proper range settings on the you should get a good display. This arrangement will not adversely affect your output. Another nice advantage is that the output to the scope will not be affected by the volume control so you can set the oscilloscope settings and leave them. I just hooked up a small handheld to one of the outputs of my receiver and found that 0.1 volts per cm and horizontal scan of 1 millisecond looked pretty good. It is important to have the grounds in place as this is the reference from which the signal voltage is read. With the grounds unconnected you will see more noise.John

author: oscopenoob
author_rank: Newbie
timestamp: November 16, 2017, 07:16:48 am
content: Wow! Thank you so much! I will try that because maybe part of the problem was I was not grounded... DUH! It needs to complete a circuit, right? Thanks a whole lot!I will report back with findings.

author: Electro Fan
author_rank: Super Contributor
timestamp: November 16, 2017, 07:31:52 am
content: Try the tape outputs (left and right). Run a regular stereo RCA patch cord from the tape outputs to the scope inputs (Channel 1 and Channel 2).Use RCA to BNC adapters like these on the scope inputs to accommodate the RCA patch cord:https://www.amazon.com/GW-Security-Female-Connector-10pcs/dp/B001HBOOH6/ref=sr_1_9?ie=UTF8&qid=1510816883&sr=8-9&keywords=bnc+to+rca+adapterSet the scope for XY mode. Center the trace(s). Adjust the voltage and time base to your preferences. Try turning on and off Ch1 or Ch2 on the scope while in XY mode - you might prefer both channels on or possibly just one.Happy listening and watching!!
Oscilloscope transformer troubles - Page 1
Forum section: electronics / beginners

author: pitpat
author_rank: Contributor
timestamp: May 15, 2020, 08:20:23 pm
content: So, I've got this Hm-103 hameg that died on me recently, after checking every components i've found a dead bf199 transistor.After replacing it i still got no trace so i started cheking some voltages across the board (avoiding the kv rails) and from the tranformer in the 150 ac out (from schematics spec) i get 161,6 ac.Is it possible an increase of voltage caused by some bad components?If the 150 ac out is gone can i step down the voltage to get again in specs?https://cdn.rohde-schwarz.com/hameg-archive/HM103_englisch.pdfthanks

author: vk6zgo
author_rank: Super Contributor
timestamp: May 16, 2020, 01:19:23 am
content: The nominal transformer secondary voltages areapproximate.A difference of the order you are seeing is not uncommon for a transformer which is not supplying current to a circuit.Another reason the secondary voltage may be a bit high (even when loaded), is if the ac Mains supply in your area is high.For these reasons, I would suggest your transformer is OK.

author: pitpat
author_rank: Contributor
timestamp: May 16, 2020, 08:55:25 am
content: Thats a great news!! now the thing is to find the faulty one.Connected to that trace i have 2 big 2w resistors that gets proper hot (R630 and R802 on schematics) so i would guess that there's something upstream that doesnt draw enough courrent,am i right?

author: pitpat
author_rank: Contributor
timestamp: May 16, 2020, 10:44:55 am
content: ok, changed the ac main fuse on 240 ac and now im in spec, still got no trace and the big resistors are still too hot to be touched.
oscilloscope types - Page 1
Forum section: electronics / beginners

author: m3vuv
author_rank: Super Contributor
timestamp: January 01, 2022, 03:16:56 pm
content: Hi all,i am pretty familliar with scope types but ive just come across one advertised as 4 beam,i know there are 2ch scopes with dual timebases etc for each chanell but never heard of a 4 beam one,unless its a 4 ch scope,ive seen this IWATSU SS-5710,but the four beam part has lost me,can anyone explain it in simple terms,cheers m3vuv and a happy new year to all.

author: george.b
author_rank: Frequent Contributor
timestamp: January 01, 2022, 03:45:01 pm
content: Yeah, no. The SS-5710 can display 4 traces, but not with 4 beams, it uses ALT/CHOP modes. I don't think 4-beam scopes even exist. According to the manual:Quote

author: Ian.M
author_rank: Super Contributor
timestamp: January 01, 2022, 03:54:51 pm
content: George beat me to itIts certainly not got a four beam CRT, as the front panel has buttons for mode: CH1, CH2, Alt, Chop, Quad. Alt/Chop imply a single beam CRT, with the traces multiplexed by a beam switch in the Y amp.It does however have four channels but CH3 and CH4 are very limited with only a 0.1V/1V per div selector, AC/DC coupling and Y position, though they can be selected as trigger sources.If the price is right and it appears to be fully working, go for it, as it appears to be a pretty capable 60MHz vernier delay timebase CRO.

author: tggzzz
author_rank: Super Contributor
timestamp: January 01, 2022, 08:33:03 pm
content: I have a dual beam storage scope, Telequipment DM63, with plugins giving three channels.The dual bean is necessary to capture fast transients on two channels, since neither ALT nor CHOP modes would work.

author: Ian.M
author_rank: Super Contributor
timestamp: January 01, 2022, 08:40:24 pm
content: Nice!Many moons ago I owned one of these:An all valve, dual beam CRT,Hartley Electromotive Type 13A Oscilloscope, just like this one, except mine was less beat up and had its original CRT hood and a graticule. If you defocussed it on a slow enough timebase setting, you got two half-moon shaped spots with their straight side horizontal, images of the active cathode surface in the electron gun, split by the beam splitter electrodes!

author: CaptDon
author_rank: Super Contributor
timestamp: January 02, 2022, 05:20:48 pm
content: There was a dual gun C.R.T. made for true 'dual beam' scopes. I think it was 5XP1. A monster of a bottle with lots of pins. I also owned a Waterman scope that used DUAL 3" rectangular C.R.T.'s one above the other. Back in the 70's there was a guy who went by the name of 'Surplus Al' who attended all of the hamfests. I saw at Gaithersburg Md in his collection of weird military surplus a TRUE 4 GUN 4 beam oscilloscope. It was a rack mount unit, all vacuum tube. The scope part was around 14 inches tall and the separate power supply just as big. I don't recall if it was a 5" round or 7" round C.R.T.? A bunch of us 'scope junkies', you know, the ones who started with OS-8 navy units were drooling over this beast. I think Al wanted something like $500.00 for it, that was A LOT of money back then.
Oscilloscope usage in magnifying some DC trace to show ripple voltage - Page 1
Forum section: electronics / beginners

author: nightfire
author_rank: Frequent Contributor
timestamp: February 27, 2021, 10:35:37 pm
content: Hallo together,I am a proud first time owner of some entry-level scope (Rigol DS1102Z-E, basically a 2connector version of the DS1054Z).I familiarized myself with the most options, but I am stuck on the following task:I want to measure my small lab power supply (Peaktech 6225A) for ripple voltage. No problem, hook it up to the scope and it shows a nice horizontal line in the upper half of the screen, as expected. Also not unexpected, some ripple, the integrated statistics like to tell me about 200 mV pp.Now I want to magnify that, so that I can see the real mess- on horizontal it is easy, but on vertical it seems not to have a feature like zooming in on that line- everything I seem to be able to do is to lower the voltage per division, which makes the line jump far away- and needs to be pulled down again.Did I oversee something, is there a trick, or is it just this scope model, that has such a function not implemented?

author: tunk
author_rank: Super Contributor
timestamp: February 27, 2021, 11:12:32 pm
content: Set it to AC coupling, that should remove the DC component.
Oscilloscope vertical scale not working as expected  - Page 1
Forum section: electronics / beginners

author: bobyclaws
author_rank: Newbie
timestamp: August 04, 2022, 03:15:04 am
content: Hello! Im new to oscilloscopes and just bought a siglent SDS 1202X-E. Aside from the power button not blinking as it's supposed to when AC powered (but not turned on), which i can overlook. I have this problem with the scope's vertical/voltage division where, when i switch from 120mv to 118mv (using 1KHz; 0v-3v p-p test signal from the scope.) The base of signal is no longer positioned at the reference and goes way down that i can't even reach it without increasing volts per division.I'm not sure if this is expected behaviour. But it's making me hard to find noise at the 0v level of the test signal.Additional notes: this behaviour does not occur when I'm using 10x and only happens with 1x. And yes, i did not forget to set the same attenuation in scope.Here's a short video showcasing it:https://youtu.be/1_U84Q1kQykThank you

author: radiolistener
author_rank: Super Contributor
timestamp: August 04, 2022, 09:23:51 pm
content: you can use vertical offset knob to find the bottom part of the waveform.But note, part of your waveform is outside of the screen (it is above top border of the screen) it means that ADC and frontend circuit works in overload mode, such mode can lead to a waveform distortions which doesn't exists in the real signal.Use offset and gain knobs in such way to keep entire waveform (top and bottom parts) on the screen. Otherwise it can display incorrect waveform.

author: tautech
author_rank: Super Contributor
timestamp: August 05, 2022, 03:50:54 am
content: Quote from: bobyclaws on August 04, 2022, 03:15:04 amOlder ones blink and that annoys some and I believe the latest units just use a background glow.QuoteLike radiolistener explains, you are diving the ADC into overload.The channel offset limitations are listed on P8 of the datasheet as:120 mV- 1.18 V: ± 20 VOffset Range (Probe 1X)1.2 V- 10 V: ± 200 VNotice how 1x and 10x probe settings can be impacted upon differently ?You can at times stay within the offset limits when AC input coupling is selected.
Oscilloscope view in datasheets - Page 1
Forum section: electronics / beginners

author: Nikos A.
author_rank: Regular Contributor
timestamp: October 22, 2021, 09:57:41 am
content: Hi everyone,Could someone explain me how to read the following Oscilloscope view? I understand what is theV/div and mA/div but I do not understand where is the reference/zero point. The arrows for t=0 represent the reference point? I believe that for t=0 all mesurements are zero, then, after 30ms VIN = 4.5v and after almost 68ms VOUT = 4V. Is that correct?

author: drdm
author_rank: Contributor
timestamp: October 22, 2021, 11:32:33 am
content: You can see the small arrows in red that show where the 0 voltage is for that specific channel.As for the time - it does not matter where the 0 is, because the 0 time depends on where the measurement is triggered.For your case - the 0 time is the rising edge of Vin (see the arrows in green.)This picture only serves to show that Vout rises ~37mS after Vin.Zero time in a scope does not start at the beginning of the screen.

author: StillTrying
author_rank: Super Contributor
timestamp: October 22, 2021, 11:59:59 am
content: Time starts from where the VIN rises to 5V, before that it's just all off forever, how long it's been off doesn't matter.https://www.ti.com/lit/gpn/bq25101

author: Nikos A.
author_rank: Regular Contributor
timestamp: October 22, 2021, 12:58:39 pm
content: Thanks guys, this is clear now!!
Oscilloscope voltage reading and volts/div - Page 1
Forum section: electronics / beginners

author: znerihc
author_rank: Newbie
timestamp: August 15, 2021, 01:27:22 pm
content: I recently got a Hantek DSO4102C oscilloscope. I noticed that increasing volts/div gives inaccurate peak-to-peak voltage signal readings.For example, this is the signal from the probe compensation terminal at 2V/div:The scope measures 5.28V pk-pk. When at 20V/div however:It measure 8V pk-pk. Is this a faulty scope?

author: bdunham7
author_rank: Super Contributor
timestamp: August 15, 2021, 01:35:09 pm
content: No, you are simply running out of vertical resolution at such a high V/div setting. It appears that each bit of your 8-bit input is worth 800mV at that setting, so the scope can only resolve the measurements to the nearest 0.8V. It's doing the best it can with that.

author: znerihc
author_rank: Newbie
timestamp: August 15, 2021, 01:53:04 pm
content: Thanks for the reply. I tried looking this up on Google, to no avail. It seems the correct terms to search for involves "vertical resolution", as you mentioned.

author: TimFox
author_rank: Super Contributor
timestamp: August 15, 2021, 02:11:06 pm
content: Simply put: the ADC limits the resolution. An 8-bit ADC has discrete levels that are 1/256 of the full scale, which is somewhat greater than the maximum range that can be displayed at your "V/div" setting.

author: StillTrying
author_rank: Super Contributor
timestamp: August 15, 2021, 03:15:27 pm
content: Yes, scopes are not very good at measuring voltage levels especially when the waveform is only a few pixels high.Move the 0V marker down 2 or 3 divisions and view the waveform on 1V/Div., and perhaps use 4X or 8X averaging to reduce the noise, and that will be about the best accuracy on the 0V and 5V levels.Waveform averaging is on page 58.http://www.hantek.com/Product/DSO4000C/DSO4000C_Manual.pdf

author: David Hess
author_rank: Super Contributor
timestamp: August 16, 2021, 02:05:16 am
content: Automatic peak-to-peak measurements are very sensitive to the signal-to-noise ratio of the signal which decreases as the volts/div is increased. Depending on exactly how the display record is produced, the peak-to-peak measurement may be picking up something which is not visible on the display.
oscilloscope wave shape - Page 1
Forum section: electronics / beginners

author: kentroverman
author_rank: Newbie
timestamp: July 08, 2015, 07:07:35 pm
content: HI Guys, Need a bit of help. Made a standard bridge rectifier on a bread board. Conected my probe from my rigol ds 1054z. with the probe on 1X it looks like a proper fully retified wave, but when i change the probe attenuation to 10X the wave looks strange as per attached png file. my welerman oscilloscope on 10X shows the wave as you would want to see a fully rectified wave. any info would be appreciated. Hope i have made myself clear as I am new to electronics. Thanks

author: fubar.gr
author_rank: Unknown
timestamp: July 08, 2015, 07:39:32 pm
content: Real life diodes (as opposed to ideal ones) have some series capacitance. When the load on the bridge rectifier is too low (ie high impedance of the oscilloscope in 10x) the capacitance causes these oscillations.See this:http://en-us.fluke.com/community/fluke-news-plus/electrical/measuring-a-rectifier-with-no-load.html

author: kentroverman
author_rank: Newbie
timestamp: July 08, 2015, 10:33:46 pm
content: Thank you, very helpfull.

author: Phoenix
author_rank: Frequent Contributor
timestamp: July 09, 2015, 06:15:11 am
content: You can fix it quite easily with a small load on the output (1k-10k kinda thing).What I can never work out is why for one half of the cycle the rectified voltage reached zero, it's only ever the other half of the cycle that appears wonky. Intuitively I would expect symmetrical behaviour (same shape each fundamental half cycle).

author: kentroverman
author_rank: Newbie
timestamp: July 09, 2015, 10:03:48 pm
content: Thanks, I will try a resistor.
Oscilloscopes and the -3dB thing - Page 1
Forum section: electronics / beginners

author: JustAnotherGuy999
author_rank: Contributor
timestamp: February 27, 2016, 01:03:27 pm
content: I understood that: if i have an oscilloscope with a 100MHz bandwidth and tried to visualize a waveform of 100MHz, 1V peak to peak, the oscilloscope is going to show me 70% of its real amplitude, i,e: 0.7V, is this true? if so is this mean that oscilloscopes are not to be "trusted" when it comes to amplitudes, and used just to see the waveform shape and frequency?what is the maximum bandwidth that is considered to be "trustfull" in this oscilloscope?is there a forumla how to calculate this bandwidth?is there a forumla to calculate by how much the amplitude will diminish at a certain frequency?if so why not the oscilloscopes makers "implement" it in the oscilloscope, and make life easier to every one?

author: wraper
author_rank: Unknown
timestamp: February 27, 2016, 01:55:09 pm
content: -3dB is the worst case they can clam the bandwidth, usually they are much better.

author: awallin
author_rank: Frequent Contributor
timestamp: February 27, 2016, 01:57:45 pm
content: If all you are measuring is sine-waves, then yes in principle you could correct for the amplitude roll-off and measure with better accuracy a bit beyond the specified bandwidth.Any other waveform will contain multiple tones and the scope can't know what the signal contains so it's not feasible to apply corrections.I've posted the Rigol DS2072A response in the upgrade thread, it deviates quite a bit from a simple RC-filter, so it's not something you can rely on - you'd have to measure it for your particular scope.http://www.anderswallin.net/wp-content/uploads/2015/12/rigol_DS2072A_upgrade.png
Oscilloscope donation for a beginner - request - Page 1
Forum section: electronics / beginners

author: fenclu
author_rank: Regular Contributor
timestamp: July 14, 2012, 02:44:29 pm
content: HiI'm probably not the first one to ask for a free oscilloscope. I'm from Poland and here oscilloscopes are rare and expensive. I'm keen to learn electronics and I just can't continue without an oscilloscope in my lab. I obviously can't afford one.So, to all engineers out there : if someone has an oscilloscope leftover and would like to donate it I would gladly accept it. I can pay for the shipping, which is still going to be very expensive but it's still much cheaper than an oscilloscope. I think I can only accept an oscilloscope from someone from Europe, escpecially from Poland or from a nearby coutry, because it would cost over 150USD to ship it from USA to Poland. I guess I could accept one out of Europe if the postage is under 50 bucks but I doubt it would be that cheap.It would be best if the scope was over 20MHz bandwidth.Best regardsJakub (fenclu)

author: matmay
author_rank: Newbie
timestamp: May 21, 2014, 11:45:49 am
content: 62€:http://www.ebay.at/itm/181060275955?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649Just bought one and it works!

author: Zbig
author_rank: Frequent Contributor
timestamp: May 21, 2014, 02:04:49 pm
content: Quote from: fenclu on July 14, 2012, 02:44:29 pmNo, they're not. The average wage here leaves much to be desired but there's nothing particularly specific regarding neither the price nor the availability of oscilloscopes, both new and used, here. Haven't you tried this:http://allegro.pl/aparatura-pomiarowa-oscyloskopy-67212, really? Or make a call to the nearest technical university - chances are you'll get a retired gear in need of cleaning a pot or two essentially for free.Quote from: fenclu on July 14, 2012, 02:44:29 pmObviously? And that's obvious how exactly?

author: tinhead
author_rank: Super Contributor
timestamp: May 21, 2014, 02:23:11 pm
content: lol, removed, just check date before posting

author: Zbig
author_rank: Frequent Contributor
timestamp: May 21, 2014, 03:04:53 pm
content: Quote from: tinhead on May 21, 2014, 02:23:11 pm

author: fenclu
author_rank: Regular Contributor
timestamp: May 21, 2014, 04:32:41 pm
content: Quote from: tinhead on May 21, 2014, 02:23:11 pmStill relevant though...

author: tiborsimon
author_rank: Contributor
timestamp: May 24, 2014, 10:14:21 am
content: You can try some DIY ones if you desperately need one. With an arduino or any micro and/or a PC you can do a lot. Just be creative.http://www.instructables.com/id/Arduino-Oscilloscope-poor-mans-Oscilloscope/http://www.zeitnitz.de/Christian/scope_en
Osciloscope probe RMS voltage. - Page 1
Forum section: electronics / beginners

author: Alen Hodžič
author_rank: Newbie
timestamp: November 07, 2023, 09:23:01 pm
content: Hello everybody! This is my first post at this awsome site. I have recently purchased a digital osciloscope fnirsi 1C15 model to be exact. The RMS voltage for the scope input is specified 400v RMS.The scope came with a standard P6100 1x- 10x probe it is rated 600V peak. Now I decided that for the scope's safety that I would purchase this 100X probe rated for 2KV. which i will show the image of. In the datasheet or manual it says the probe is rated 2KV peak to peak.... But on the probe itself it says 2KV peak... so that means 4KV peak to peak.I just have one question about this probe and I did some calculations myself...The probe is 4KV peak to peak... Thats is 2KV peak as it says on the probe. So is the maximum RMS voltage I can measure with it 1414V?Because the original facotry probe is 600V peak. That meabs 1200V peak to peak... so RMS should be 424V....Please correct me If I am wrong with my calculations.... I really dont want to destory my scope because I need it to measure switching power supplies

author: radiolistener
author_rank: Super Contributor
timestamp: November 07, 2023, 09:32:04 pm
content: I would suggest you to not exceed for Chinese probes:- 100 V for 1:10- 500 V for 1:100Just don't expect > 500 V from Chinese probes, it is very dangerous, they using cable which is rated at 400 V max.Also note that their rating is for DC voltage which is below 20 kHz.If you want to measure AC > 20 kHz, then note that probe rating is decreased with frequency and will be:- max 25 V at 100 MHz for 1:10- max 100 V at 100 MHz for 1:100You can find this limit curve in your probe manual.

author: tggzzz
author_rank: Super Contributor
timestamp: November 07, 2023, 09:59:11 pm
content: Quote from: Alen Hodžič on November 07, 2023, 09:23:01 pmThe tip capacitance is 6pF. If you put 1414Vac at 100MHz across it, what will be the current flowing through that capacitance?Check the voltage vs frequency derating curve.When probing SMPSs, make very sure you understandallthe ways dangerous situations can occur. I suggest reading the references athttps://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/and afterwards working out whichclassof probe to use (e.g. HV differential).

author: bdunham7
author_rank: Super Contributor
timestamp: November 07, 2023, 11:35:30 pm
content: Here's a video review.
Oscope reading open circuit - Page 1
Forum section: electronics / beginners

author: ArcticPhoenix0
author_rank: Contributor
timestamp: March 03, 2020, 12:48:27 am
content: Newbie here with a simple circuit build. Trying to get an idea of how to use my scope so bear with me if this is clear and obvious.4AA's220o resistorviolet/blue LED220uF cap (cap removed).Just poking around with my oscope and can't figure out what I'm measuring here off the positive LED leg. The circuit is open; negative battery terminal is off the board and the cap is pulled. Still showing a reading on the scope and I can't explain why. Shouldn't it be showing a flat line?

author: rstofer
author_rank: Super Contributor
timestamp: March 03, 2020, 01:03:07 am
content: From the photo, it's not possible to determine V/div and time/div. With all that antenna wire laying around, it is certainly possible to get a trace even though the voltage is likely to be quite low. Try shorting out the probe or even removing the probe from the scope. Then what happens?

author: ArcticPhoenix0
author_rank: Contributor
timestamp: March 03, 2020, 01:07:42 am
content: I'm thinking I'm picking up my house power. It's right at 60Mhz. 200mv and 20ms/Div.This is what I get when everything's on and the probe is grounded to the negative battery terminal.

author: xrunner
author_rank: Super Contributor
timestamp: March 03, 2020, 01:12:16 am
content: Quote from: ArcticPhoenix0 on March 03, 2020, 12:48:27 amI grabbed your image and expanded it on my pc. Your display is indicating F=60.0 Hz. That's picking up line voltage noise.

author: StillTrying
author_rank: Super Contributor
timestamp: March 03, 2020, 01:13:21 am
content: It's just the normal few volts of 60Hz noise that anopen circuit input, = the scope's input picks up.Don't you find that everything slides off with the desk like that.60MHz

author: james_s
author_rank: Super Contributor
timestamp: March 03, 2020, 01:30:53 am
content: Scope inputs are very sensitive, a wire, your finger, anything that acts like an antenna will pipe a signal into it. Without any sort of tuner (filter) the power line frequency will normally dominate what you see.

author: ArcticPhoenix0
author_rank: Contributor
timestamp: March 03, 2020, 01:38:52 am
content: Quote from: StillTryingDon't you find that everything slides off with the desk like that.60 [sIdk man, I'm still trying to figure it out. I can replace stuff that's clearly burnt out or suck up solder that's bridging IC pins but that's about it atm.

author: rstofer
author_rank: Super Contributor
timestamp: March 03, 2020, 03:02:01 am
content: Quote from: ArcticPhoenix0 on March 03, 2020, 01:38:52 amThis stuff takes time. At least you have a first rate scope!Put your finger on the tip of the scope probe and watch the trace go crazy at line frequency.