hybridfree/eevblog-posts huggingface dataset:
Oscilloscope for lcd TV troubleshooting? - Page 1
Forum section: electronics / beginners

author: wadmancpu
author_rank: Contributor
timestamp: August 29, 2018, 04:32:29 pm
content: I was wondering what everyones opinion is on having an oscilloscope for doing tv repairs and troubleshooting. A good investment or unnecessary?

author: keymaster
author_rank: Regular Contributor
timestamp: August 29, 2018, 06:52:50 pm
content: In most cases ,it will be useless .50% will be the leds10% will be the diodes or feds of the power supply15% will be capacitors ( it was much higher a few years back)5% will be software problems and firmware corruption5% will be connectors and ports damageAnd the rest 15% will be problems in the digital boards (the only place you will need an oscilloscope ) but most of the time will be to difficult or no cost effective to bother.a multimeter and a soldering iron is all you need.tools that will make your life easer is a led tester or a lab power supply to test the led streps individually . i use a variac with a full bridge rectifier and a 1kohm in series to test all the leds before i start the disassembly of the panel
Oscilloscope Gould OS300 horizontal trace problem - Page 1
Forum section: electronics / beginners

author: jpwm
author_rank: Newbie
timestamp: September 20, 2019, 05:50:51 pm
content: Hi,I recently purchased this oscilloscope on Ebay, unfortunately the seller packed it badly so that some plastic parts of the case broke and the CRT came loose. I pulled it back into position and fastened it with cable ties. Unfortunately the horizontal axis doesn't work properly anymore.The trace of both channels can only be moved horizontally in an area between the left edge and the middle. Both traces can be moved vertically over the complete height up to outside the CRT.I have the manual for the oscilloscope, but so far I have only worked with considerably newer devices and therefore I can't really understand which setting could solve this problem. Online I found some similar questions, but there were never satisfactory answers. I would be happy if anyone had an idea what the problem is.(I also uploaded a video of the problem:https://streamable.com/z8c7c)
Oscilloscope, Ground linking, and frequency counter - Page 1
Forum section: electronics / beginners

author: mikeev
author_rank: Contributor
timestamp: March 27, 2018, 09:17:34 pm
content: Hello,my scope is a rigol DS1054Z.I meet a behavior that I do not explain myself.I'm using an microcontroller atmel attiny to generate a pulse at 50 hz.When I check frequency using the scope using instant measure on the channel, or statistics, it displays well 50 hz.When I interconnect attiny ground with an arduino uno ground in order to make them communicate (I don't touch anything in the running code), the scope measure frequency is NOT 50 hz anymore.The measurement observed on the oscilloscope fluctuates between 50 hertz and 100 hertz.To power arduino and attiny, I can use a power supply 5v/2a from mobile phone, or a laboratory PSU : It does not change anyting. Measure still fluctuates.Visually on the scope nothing changes, only the measure.I double checked the pulse generation with my saleae logic analyser, nothing is wrong with the pulse generated.The frequency is still 50 hz.Any Idea why scope displays strange frequency measure ?thanks

author: wn1fju
author_rank: Frequent Contributor
timestamp: March 28, 2018, 10:55:10 pm
content: Just a wild guess, but are you sure that you don't have some higher frequency noise spikes? You might not see them on the scope's displaydue to the long timebase, but the algorithms in the scope that are measuring frequency can get thrown off by them. Try doing a few one-shotcaptures at a shorter time base and take a careful look.

author: Teun
author_rank: Regular Contributor
timestamp: March 30, 2018, 03:10:38 pm
content: Reference level problem? Phase of arduino and atmel 180 degrees difference?
Oscilloscope help - Page 1
Forum section: electronics / beginners

author: rthorntn
author_rank: Frequent Contributor
timestamp: March 19, 2019, 06:57:38 am
content: Hi,I have a DS1102E (that I have hardly used) and a DAC to test, the DAC should be outputting a voltage in 0.25v increments every 2 seconds, how do I see and properly verify this on a scope like mine?I have no idea how to use it, please be gentle.Can someone point me in the direction of some basic instructions on how to verify the DAC works?Thanks.Richard

author: rstofer
author_rank: Super Contributor
timestamp: March 19, 2019, 04:31:06 pm
content: If you wanted to see 5V total then you would need 20 steps at 2 seconds each. This is probably better done with a DMM. Easiest to do with a V-O-M if you don't care about exact values. Just watch the needle move...Anyway, you want 40 seconds spread across 12 divisions so you want something over 3 seconds/division. You're in luck, the scope has 5 seconds per division.Now all you have to do is set the trigger at the first step above 0V (using Trigger Level knob) and move the trigger point all the way (or even just part way) to the left (using Horizontal Position knob) of the display.

author: james_s
author_rank: Super Contributor
timestamp: March 20, 2019, 06:53:50 am
content: My suggestion would be start by reading the manual, then watch some videos on YouTube on how to use an oscilloscope. Once you know how to use the scope, you won't have to ask how to perform each individual task you come across. Spend some time playing around with it, you'll get the hang of how it works fairly quickly. Be sure to watch Dave's video on how to not blow up your oscilloscope too.

author: thedoc298
author_rank: Contributor
timestamp: March 20, 2019, 08:51:52 am
content: Quote from: james_s on March 20, 2019, 06:53:50 amI agree, the best way to learn and learn quick is to watch one of the many many youtube oscillscope videos. Any subject you want. Warning you can get addicted. Really

author: rstofer
author_rank: Super Contributor
timestamp: March 20, 2019, 01:04:31 pm
content: There's a great video series in the 'stickies' at the top of this forum.https://www.eevblog.com/forum/beginners/oscilloscope-training-class-(long)/Most scopes provide a probe compensation signal on the front panel. This can be viewed and used as something of a training signal. Try different triggers, different volts/div, different time/div and, for DSOs, moving the trigger point left and right on the screen. Could even try FFT...
Oscilloscope LCD artifacts - Page 1
Forum section: electronics / beginners

author: Docholiday
author_rank: Regular Contributor
timestamp: January 20, 2015, 01:21:34 am
content: Attached is a screen shot from a Yokogawa DL7100 oscilloscope. Are these artifacts on the screen normal? Perhaps noise from the fan or ? This is visible before and after scope setup and calibration.

author: tautech
author_rank: Super Contributor
timestamp: January 20, 2015, 02:14:40 am
content: Yes quite normal in a DSO.It's Noise and can be reduced with your DSO settings.Dave did 2 videos on this not too long ago.http://www.eevblog.com/2014/04/10/eevblog-601-why-digital-oscilloscopes-appear-noisy/http://www.eevblog.com/2014/04/27/eevblog-610-why-digital-scopes-appear-noisy-part-2/

author: Docholiday
author_rank: Regular Contributor
timestamp: January 20, 2015, 04:02:39 am
content: Thank you very much. I now get it.

author: coppice
author_rank: Super Contributor
timestamp: January 20, 2015, 04:14:29 am
content: A flat trace would actually be a poor design. If they spent enough to make the amps that quiet, they should have put those resources into something more useful.You can often see a perfectly flat line on modern oscilloscopes when you switch an input to the grounded setting, but that's because they are simply displaying a flat line, and all the analogue circuitry has been disconnected. Some people complain about that, but its necessary in some designs. If you are going to up the sampling rate in the remaining channels when you disable some, there is actually no digitiser to sample those disabled channels.

author: Docholiday
author_rank: Regular Contributor
timestamp: January 20, 2015, 04:36:02 am
content: Thank you for the added info. There is much yet to learn!
Oscilloscope - LINE trigger - Page 1
Forum section: electronics / beginners

author: sebinmathew
author_rank: Newbie
timestamp: April 24, 2014, 05:04:19 pm
content: Can somebody answer this.An oscilloscope is powered from 230V, 50Hz. Triggering mode is set to LINE. A square wave from a signal generator is fed into the Y-input of the CRO and a stable display is obtained when the frequency of signal generator is 297 Hz. Assuming the signal generator to be error free, what is the actually frequency of power supply?Kindly help with this.Thank you

author: Anks
author_rank: Frequent Contributor
timestamp: April 24, 2014, 06:01:04 pm
content: Any signal that is a multiple of the supply frequency should be stable just with more cycles on the screen the higher you go.So if the generator is correct the line supply freq is 49.5Hz

author: Anks
author_rank: Frequent Contributor
timestamp: April 24, 2014, 06:02:48 pm
content: Have I just answered your homework.

author: KedasProbe
author_rank: Frequent Contributor
timestamp: April 24, 2014, 06:07:11 pm
content: Whose homework is this, yours?
Oscilloscope makes Analog Meter deflect. - Page 1
Forum section: electronics / beginners

author: iamnothim
author_rank: Regular Contributor
timestamp: April 24, 2013, 03:36:42 am
content: I'm the guy rebuilding the vacuum tube tester.I actually got the dumb thing to work on a Proto-Board.I calibrated the Grid Emissions test and it worked.The "Quality" test shows the difference between a reference tube and marginal ones.I measured 95 ohm resistance across the meter.In the circuit there is a 200µF 10C cap across an Analog Meter +/-When I put a DMM across the meter during a Quality test max 120 on the meter = 0.095VDCDuring the Emissions test 0.0001VDC is resting and 0.0020VDC is the edge of the red zone.I don't yet understand the Shorts Test schematic but that's for another time.QUESTION:I wanted to connect my DS1052E across the Analog meter.When I did the needle went nuts and started to oscillate.I know. Oscillate = Oscilloscope. I thought it was passive.Is the scope's clock inserted into the circuit?I am set for 10X probe.Thanks

author: w2aew
author_rank: Super Contributor
timestamp: April 24, 2013, 04:31:15 am
content: Without seeing your schematics, it's difficult to say what the problem might be. The first two things that come to mind are...1) Is one side of your meter grounded? The 10x probe is not floating like your DMM, the ground lead is earth ground, and can cause funny, exciting, interesting and destructive things when connected to a non-grounded circuit node.2) The probe could be injecting 50/60Hz mains stray pickup into your circuit.

author: iamnothim
author_rank: Regular Contributor
timestamp: April 24, 2013, 04:34:19 am
content: All the voltage is supplied by transformer secondaries. The primaries are not connected to earth. 2 prong plugDMM and meter test points were both sides of the 220 mF CAP

author: iamnothim
author_rank: Regular Contributor
timestamp: April 25, 2013, 03:39:22 pm
content: What I experienced was a perfect example of Dave's less on "How not to blow up your Oscilloscope".This old circuit "back-hauled" mains from the transformer primary onto the circuit. When I plugged inthe scopes ground lead all the little electrons bum rushed the turnstiles (meter needle) to evacuate the circuit.The needle looked like Charlie Manson's polygraph.I have ordered a transformer with a 120V secondary that will provide the necessary high voltage to the circuit.This should isolate the circuit and allow me to use a scope.Before I realized what was going on, I decided to film the anomaly to see if someone might have a suggestion. During which a 500 ohm 5W resistor went up in smoke. It then dawned on me what I was doing. Should anyone want me to post it let me know.

author: Zapro
author_rank: Contributor
timestamp: May 11, 2013, 08:56:55 pm
content: Good you found the culprit. Be happy that it was just the resistor that went up in smoke , and not the ground trace inside your scope!!// Per.
What does "short the test pin" mean? (oscilloscope) - Page 1
Forum section: electronics / beginners

author: TheMarineBiologist
author_rank: Newbie
timestamp: March 23, 2019, 12:57:16 pm
content: Hi!I recently bought an old analog oscilloscope, that I am trying to calibrate. I am however asked to short the test pin in one of the steps.. And I am not really sure where the test pin is located and what to short it to.. Or are we talking about the probe and ground?The manual and the question at hand can be found here under 5.2.2.2.a.https://www.manualslib.com/manual/235950/Elenco-Electronics-Mo-1251.html?page=17#manual

author: StillTrying
author_rank: Super Contributor
timestamp: March 23, 2019, 02:10:00 pm
content: When trace lines shift with the change of DC-GND-AC slide switchShort the Test Pin and adjust VR6It looks like it will be the probe tip and ground to be shorted to me.
Oscilloscope max input voltage with x1 probe? - Page 1
Forum section: electronics / beginners

author: Porama6400
author_rank: Regular Contributor
timestamp: August 22, 2016, 03:13:02 pm
content: How much voltage I can probe with my oscilloscope with 1x probe?http://www.thaieasyelec.com/downloads/DSO5000BMT/DSO5000BMT_Series_Datasheet.pdfSo it can take 300V and 450V pulse?Sorry for my bad English skill.

author: MosherIV
author_rank: Super Contributor
timestamp: August 22, 2016, 03:30:52 pm
content: The manual from your link claims"Analog Bandwidth inNormal and Average Modesat BNC or with probe,DC Coupled"to be"2V/div, ±40V"So NO, you cannot measure 300V or 450V with x1 probe.

author: Porama6400
author_rank: Regular Contributor
timestamp: August 22, 2016, 03:55:10 pm
content: "....... peak value must be less than 450V. Excursion above 300V should be of less than 100ms duration."So I can't mesure but it won't kill it with 300V , right?

author: tggzzz
author_rank: Super Contributor
timestamp: August 22, 2016, 04:07:19 pm
content: Quote from: MosherIV on August 22, 2016, 03:30:52 pmAlso look at the probe's specification.And if you use a *10 probe, youmustread the manual for the probe.Probeshave a maximum voltage, and their maximum allowable voltage dependsstronglyon frequency.If you want to probe high voltages, youmustknow what you are doing, use the correct equipment, anduse it correctly. Mistakes destroy equipment and people.Personally I will not give definite high voltage advice on this forum, because it is easy for me to give advice that is incomplete or is misunderstood - and hence lead to an accident.

author: MosherIV
author_rank: Super Contributor
timestamp: August 22, 2016, 04:35:03 pm
content: QuoteThe manual you referenced says :"Max. Input Voltage" -"CAT1 and CAT II : 300VRMS (10x); Installation Category III: 150VRMS(1x)....For non-sinusoidak waveforms, peak value must be less than 450V.Excursion above 300V should be of less than 100ms duration.RMS signal level including all DC components removed through AC coupling must be limitedto 300V. If these values are exceeded, damage to the oscilloscope may occur"The statement about CAT I and CAT II state that you MUST use the 10x setting of the probes for it to withstand 300V.(FYI - the CAT ratings are for user safety, not necessarily for the device to survive)However, because the 10x is used, this divides the input down by 10, hence the scope input is only seeing 30V.This is within the 40V stated for the DC coupled input rating.
Oscilloscope Max input voltage - Page 1
Forum section: electronics / beginners

author: mikesifford
author_rank: Newbie
timestamp: June 12, 2011, 05:29:26 pm
content: Hey all,,,I have a Rigol 1052E which has a max input voltage of 300 vrms.I need to test a signal which is 30 vpp riding on 350 vdc.Is the voltage rating for a 1:1 probe?Also is a attenuator probe a voltage divider for dc?thanks mike

author: Unknown
author_rank: Unknown
timestamp: June 12, 2011, 05:36:01 pm
content: I believe your questions are answered inthis previous thread about the same topic.An attenuator is a voltage divider for both AC and DC (probe compensation is about making the AC attenuation the same as the DC attenuation), assuming the scope is set to DC coupling. If it's set to AC coupling, the DC input impedance is (almost) infinite, so the DC voltage at the probe tip (without attenuation) should not exceed the max. DC voltage on the AC coupling input capacitor.

author: Zero999
author_rank: Super Contributor
timestamp: June 12, 2011, 05:41:19 pm
content: Connect a neon lamp and high value resistor across the 'scope input and AC couple the signal via a suitably rated capacitor.
Oscilloscope measuring bias signal of IGBT - Page 1
Forum section: electronics / beginners

author: leftek
author_rank: Regular Contributor
timestamp: August 08, 2021, 12:37:27 pm
content: Hello, i would like to measuring the bias signal of IGBT with oscilloscope in MATH functions (-).The problem is that i take a dirty signal o the screen of oscilloscope due the effect of the emmiter-ground voltage (that is high). How can ι isolate the bias signal to be clear? Who is the right way?

author: David Hess
author_rank: Super Contributor
timestamp: August 08, 2021, 04:55:46 pm
content: If you are going to have any possibility of success using subtraction to make a differential measurement, then first you have to adjust the gain and frequency response (probe compensation) of each channel so they match. This means connecting both probes to the same test source and adjusting the gain and probe compensation of one or both probes for maximum common mode rejection ratio at all frequencies.The better solution is to use either a high voltage differential probe or an isolated probe, but these are not inexpensive.

author: leftek
author_rank: Regular Contributor
timestamp: August 09, 2021, 12:14:29 pm
content: I can't take right waveform. I think that i must purchase differential probes.Thank you.

author: David Hess
author_rank: Super Contributor
timestamp: August 11, 2021, 05:04:32 am
content: Quote from: leftek on August 09, 2021, 12:14:29 pmThe calibration waveform just needs to be a rough square wave with an amplitude of the same order as the common mode voltage that you want to measure. The calibration is to minimize the output signal.The waveform at the source of the IGBT should meet these requirements if you do not have anything better.Any high voltage differential probe should be tested with the same signal to get an idea of its performance before relying on it.
Oscilloscope Noise Issue with Different Resistor Values - Page 1
Forum section: electronics / beginners

author: SteveLTN
author_rank: Contributor
timestamp: April 19, 2024, 04:03:17 pm
content: Hello everyone,I'm encountering an issue while using an oscilloscope. When I connect the probe tip and ground across a resistor, everything seems fine. However, when I place multimeter leads across the same resistor simultaneously, my oscilloscope begins to pick up a 100 Hz noise, which I suspect is related to mains interference.Interestingly, I've noticed that the amplitude of this noise increases with the value of the resistor. I initially thought that according to Faraday's Law of electromagnetic induction, the noise level should remain constant since the loop area created by the oscilloscope's probe and ground lead remains unchanged.Could someone help clarify why the noise amplitude increases with resistor value? Is there another principle at play here that I might be overlooking? Thanks in advance!

author: MarkT
author_rank: Frequent Contributor
timestamp: April 19, 2024, 05:37:36 pm
content: Its capacitive coupling to the long leads of the multimeter from the mains wiring in the room and probably from you.Effectively the noise is constant-current as the source voltage is high and the capacitive reactance large (perhaps a few pF or so).Given constant current pushing into the resistor, the larger its value, the larger the voltage.
Oscilloscope On 2 Wire House Electric - Page 1
Forum section: electronics / beginners

author: mentaldemise
author_rank: Regular Contributor
timestamp: February 12, 2015, 12:13:59 am
content: Hi. I just got an oscilloscope today, the wife thanks you Dave!I'm in the US, so 120V @ 60Hz mains. My house has old Knob And Tube wiring; 2 Wire with no ground. I seem to be getting feedback on the scope as when I don't have the probes hooked up to anything, there appears to be a tiny 60hz signal. 90mV peak to peak. Is this something I should be concerned about? I didn't have much luck searching things like "Run scope without ground" outside of things like isolation transformers which are way above my head right now.Sorry in advance if this is not a good question. I just don't wanna blow anything up or burn the house down!Thanks(edit: added a picture)

author: tggzzz
author_rank: Super Contributor
timestamp: February 12, 2015, 12:23:29 am
content: Quote from: mentaldemise on February 12, 2015, 12:13:59 amI know nothing about the US wiring codes, but personally I'd be worried about not having a ground. And that's whether or not I had a scope!

author: tautech
author_rank: Super Contributor
timestamp: February 12, 2015, 12:32:49 am
content: Quote from: mentaldemise on February 12, 2015, 12:13:59 amI'd say with the probes attached to the scoe they are acting like an antenna picking up mains from your environment.This behaviour is normal, in fact you can use this behaviour like a "near field probe" that is with no physical connection to the DUT.Hold the probe close to a SMPS and you'll see a similar induced result but at a much higher frequency.

author: mtdoc
author_rank: Super Contributor
timestamp: February 12, 2015, 01:26:17 am
content: Picking up 60Hz noise without the probes connected to anything is normal.Home wiring without a ground is another issue - and not safe - especially if you are going to be doing electronics work.

author: Paul Price
author_rank: Super Contributor
timestamp: February 12, 2015, 02:21:51 am
content: Having grounds can be just as dangerous as not.https://www.eevblog.com/forum/beginners/new-lab-no-grounded-outlets/45/
Oscilloscope output from Adafruit 4711 Buck Converter - Page 1
Forum section: electronics / beginners

author: Lrv209
author_rank: Contributor
timestamp: January 31, 2022, 06:53:31 am
content: Hello,I have an Adafruit 4711 3.3v Buck converter and attached is the screen shot of the image I get on my Oscilloscope from the output side of the board (Gnd & 3V on the board). I am hoping someone can advise if this is what I should be seeing as I was expecting more of a square wave as I have seen with a PWM output from another source. I am powering the board from a Lipo battery and there is no load on the output just the oscilliscope probes.Very new here and very new to my Oscilloscope and trying to learn by doing and asking so if more info is needed please let me know but if this is what can be expected at least I wont spend hours chasing what is not available.My Oscilloscope is an inexpensive PC scope made by Instrustrar so there is a good possibilty it is the quality of my equipment and not my settings or my breakout board but any advice would be helpful.Regards

author: rstofer
author_rank: Super Contributor
timestamp: January 31, 2022, 06:47:01 pm
content: That waveform looks to be exactly 20 ms wide - 50 Hz. Yet you said you are powering the board with a battery! Do you have fluorescent lighting? Some other source of 50 Hz radiation?Maybe put a load on the output and see what changes.

author: Lrv209
author_rank: Contributor
timestamp: February 01, 2022, 08:43:01 am
content: Thank you Rstofer,when I read your comment I did what I should have done before posting and rechecked my connections. I then found I had misconnected a jumper on my breadboard and the Oscope Probe was just measuring a couple of wires that were acting as antenna for the 50Hz house power we have here in Australia. So thank you for your advice and sorry for posting before rechecking. Now though I get a flat line signal on my Scope where I am still expecting a PWM waveform signal but maybe that is not what I should be expecting as the output from the buck converter has become steady at approx 3.1v.and I would need to test at an earlier stage in the circuit of the PCB to see that waveform.So thank you for your help, much appreciatedEdit.. since posting the above i have received the following from Adafruit Admin“The output is regulated and filtered, so it should be a fairly steady 3.3v. You might see a bit of residual 2.2MHz ripple from the switching frequency.”So i think this answers my question.Thanks again.
Oscilloscope pick up noise from power line - Page 1
Forum section: electronics / beginners

author: chancs
author_rank: Contributor
timestamp: October 02, 2019, 11:35:56 am
content: When I turn on the LED overhead light, my oscilloscope picks up the switching noise (they are only the same power outlet). I tried to reallocate the LED light to a different outlet, the switching noise is reduced by 50%, still noticeable. Below are some screen captures showing the waveform when the LED light is turned on and is turned off.LED OFFLED ONIs there any product on the market that can reduce the switching noise?

author: Ian.M
author_rank: Super Contributor
timestamp: October 02, 2019, 11:55:22 am
content: Yep. Incandescent, or line frequency magnetic ballast fluorescent lighting!For low voltage lighting, avoid SMPSUs and PWM dimming. 'Dumb' LED strips on a linear PSU are acceptable.

author: chancs
author_rank: Contributor
timestamp: October 02, 2019, 02:38:48 pm
content: So I should better off replay the LED light with traditional filament light? Is there any energy efficient light source that would interfere with my scope?

author: ferdieCX
author_rank: Regular Contributor
timestamp: October 02, 2019, 02:49:41 pm
content: I had the same problem 5 years ago, the power brick of the LED bar interfered with the trigger of my scope.My LED bar (Diodor brand) is specified to work between 10 to 14 V so, I made a simple power supply with a 9 V + 9 V transformer, two diodesand a filter capacitor calculated to have less than 1 Vpp ripple. This way, the bar gets a voltage that roughly varies between 11 and 12 V.There is also a thread about this problem:https://www.eevblog.com/forum/beginners/oscilloscope-interference/?topicseen

author: JustMeHere
author_rank: Frequent Contributor
timestamp: October 02, 2019, 05:17:39 pm
content: https://youtu.be/ty_sxMxUWeUDave did a video on this
Oscilloscope probe(s) - Page 1
Forum section: electronics / beginners

author: Phil-In-JAX
author_rank: Newbie
timestamp: February 13, 2021, 09:18:28 pm
content: I recently bought a Kenwood CS-4125 (2 Channel 20MHz) to learn on. The manual said it came with a PC-54, but when I bought it used, it came without probes. I found this on Amazon:https://www.amazon.com/Universal-Oscilloscope-Accessories-100MHz-Minigrabber/dp/B0827JL1T2/ref=asc_df_B0827JL1T2/?tag=hyprod-20&linkCode=df0&hvadid=459686315507&hvpos=&hvnetw=g&hvrand=9251053703023508374&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9011556&hvtargid=pla-941286537563&psc=1My question: Will these 100MHz probes work with my scope? If not, is there a place I can purchase a probe (or probes) for this scope?Thanks in advance.Phil

author: Algoma
author_rank: Frequent Contributor
timestamp: February 13, 2021, 10:06:20 pm
content: Yes, those probes will work, Your Scope's Input impedance: 1MΩ, Approx. 23pFMost any of those basic probes will match that input just fine.

author: rfclown
author_rank: Frequent Contributor
timestamp: February 14, 2021, 12:45:36 am
content: Like the previous person said, those will work fine. Any probe with a bandwidth 20MHz or higher will work, as long as it has a BNC connector on the end (which most probes do). If the probe bandwidth was lower than 20MHz, it would still work, but it would limit the highest frequency that your scope is capable of measuring.Something that isn't obvious:The probes in the ad have a switch to select 10:1 or 1:1. If you select 1:1, the bandwidth will not be 100 MHz, it will be less. When you use a probe like that, I'd suggest always using the 10:1 setting unless you have a good reason not to.When you get any new probe, clip the end to the CAL thing on the scope. You'll see a square wave on the display. Adjust the scope trigger level to get a stable waveform. There is a trimmer at the base of the scope probe. Adjust the trimmer to flatten the top and bottom of the square wave.
Oscilloscope Probe Adapter? - Page 1
Forum section: electronics / beginners

author: riverrat373
author_rank: Contributor
timestamp: February 01, 2015, 04:58:13 pm
content: Where in the US would I be able to buy an adapter for the probe end of my oscilloscope probes that will connect to a male bnc fitting on my function generator?

author: theatrus
author_rank: Frequent Contributor
timestamp: February 01, 2015, 05:05:07 pm
content: How about a female to female BNC cable (with a 50ohm terminator and tee if your scope doesn't have that)?

author: w2aew
author_rank: Super Contributor
timestamp: February 01, 2015, 05:23:41 pm
content: Do you mean something like these?http://www.amazon.com/Cal-Test-Electronics-CT3655-Oscilloscope/dp/B009QBSKE2/ref=sr_1_1?ie=UTF8&qid=1422811193&sr=8-1&keywords=BNC+probe+adapter

author: mij59
author_rank: Frequent Contributor
timestamp: February 01, 2015, 05:27:06 pm
content: Take a look at EEVblog #707 5.07 min. , maybe the adapter came with your probe.
Oscilloscope Probe Question - Page 1
Forum section: electronics / beginners

author: CCB
author_rank: Unknown
timestamp: October 26, 2016, 07:32:40 am
content: Hi Everyone,I'm a scope newbie so forgive me if if I'm just asking a dumb question. I've got a new DS1054z (it came with 4x PVR2150 probes) and also purchased a Testec prob from RS specifically because it comes with a BNC adapter.Now I connect a rigol PVR2150 and the Testec probes to the scope calibration signal and run auto and I get a nice square waveform after adjusting each probe.My question is that if I 'zoom' in to look at the top of the square wave the rigol remains flat while the testec probe curves from the left lower the more I zoom in (gets alot worse the more you zoom in), why is that?Here is the probe in question: Testec TT-LF 312 Oscilloscope Scopemeter 15 MHz, 150 MHz 400 V, 600 VHave I just ordered the wrong probe for my scope?Thanks,Carl

author: Unknown
author_rank: Unknown
timestamp: October 26, 2016, 08:00:56 am
content: Try adjusting it whilst zoomed in, you should be able to make the left hand side of the pulse go both above and below the right hand side. If you can't then it's likely your probe doesn't have enough adjustment range.

author: tggzzz
author_rank: Super Contributor
timestamp: October 26, 2016, 08:02:16 am
content: It is not a "scope calibration" signal, it is a "probe calibration" signal.Have you adjusted the Testec probe's calibration in *10 mode?When buying *10 "high" impedance probes (which aren't high impedance!), ensure the probe's calibration range (e.g. 10-25pF) encompasses the scope's input capacitance (e.g. 15pF).For more info on probe, including references on which type to use and how to avoid using them dangerously, seehttps://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/

author: David Hess
author_rank: Super Contributor
timestamp: October 29, 2016, 06:18:52 am
content: The Testec TT-LF312 probe should work fine and that is a pretty unusual distortion from a probe.Does the shape of the distortion change as the gain or position is changed?It looks like the result of overload. Most oscilloscopes recover from overload poorly and unpredictably.
Oscilloscope probe sense pin - Page 1
Forum section: electronics / beginners

author: Housedad
author_rank: Frequent Contributor
timestamp: May 06, 2019, 04:49:00 am
content: Can the sense pin on a oscilloscope probe be removed? I have a couple of new 400 Mhz probes a friend gave me (China cheap). They have a sense pin, but my scopes do not use it. Should it be removed? Does it matter?

author: tautech
author_rank: Super Contributor
timestamp: May 06, 2019, 05:29:56 am
content: Quote from: Housedad on May 06, 2019, 04:49:00 amLeave them unless the pin is likely to drop into the small slot around the BNC's.Possibly if the BNC's are long enough you might make a thin plastic washer to prevent the sense pin dropping into the aforementioned slot. They are an exercise in frustration to remove should the pin engage in the BNC slot and don't ask me how I know this !Otherwise just set them up with the correct input attenuation and be sure to check their compensation range is sufficient to match the input capacitance of the scope.

author: Housedad
author_rank: Frequent Contributor
timestamp: May 06, 2019, 05:47:44 am
content: Ok. Thank you. So it is more of an inconvenience, not a major problem. Not needed to remove the pin. Thanks for the heads up about the pin going into the gap. That would have been a place I would not want to be, trying to dig it out without damaging anything. Yech.
Oscilloscope probe speed - Page 1
Forum section: electronics / beginners

author: Trozze
author_rank: Newbie
timestamp: July 19, 2014, 08:43:08 pm
content: Hello everyone!Long time reader, first time poster! Sorry for the newbie question, I’ve searched for the answer but cannot find it.I bought my first oscilloscope (Philips pm 3050) last week on eBay, still waiting for it to arrive to me in Sweden. I’m glad that I did some reading here before purchasing one because I almost bought a NANO.. Thanks guys.No probes are included and I’m not sure what to get… the scope is 60MHz, is it okay if the probes are faster than that? Most I find is 100MHz or 200MHz. I’ve read the manual for it and it says on “accessories” that a “PM8936/09” is included and has “Bandwidth: d.c…200 MHz(-3dB)” and “Useful system bandwidth: d.c…100 MHz(-3dB)”Will these work or do i need the 200MHz:http://www.ebay.co.uk/itm/X2-Two-P6100-100MHz-Oscilloscope-Probes-X1-X10-/111303809676?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item19ea395a8cI don’t want to spend too much on the probes since I don’t know the condition of the scope yet. I will however get proper probes later when I know that it works and have experimented with it.I hope you can understand my bad English. Thanks!

author: CarlG
author_rank: Regular Contributor
timestamp: July 19, 2014, 08:54:11 pm
content: The probes shall have higher bandwidth than the scope. 100 MHz probes should do fine with 60 MHz scope.However, another important parameter is the capacitive compensation range of the probes; see to that it covers the input capacitance of the scope inputs (may not be applicable to x1 probes),

author: tautech
author_rank: Super Contributor
timestamp: July 19, 2014, 09:08:24 pm
content: Those 100MHz eBay probes will be just fine.Probably the better of the cheap probes available.

author: David Hess
author_rank: Super Contributor
timestamp: July 20, 2014, 05:30:28 am
content: I have a couple sets of the same probes for my 100 MHz and slower oscilloscopes and they work fine. They are not quite as good as premium 100 MHz probes as far as performance but it takes me some effort to measure the difference.

author: HighVoltage
author_rank: Super Contributor
timestamp: July 20, 2014, 01:07:28 pm
content: You can find original Philips Probes on eBay Germany for reasonable prices in new condition.I bought several of these for some clients of mine and they always worked well.Here is an example:http://www.ebay.de/itm/Philips-Probe-Tastkopf-PM-8926-59-fur-Oszilloskop-100MHz-10x-5808-/350789986671?pt=Mess_Pr%C3%BCftechnik&hash=item51acb6696fhttp://www.ebay.de/itm/Philips-Passive-Probe-Oszi-Tastkopf-PM8927-/121383464762?pt=Mess_Pr%C3%BCftechnik&hash=item1c4304af3a
oscilloscope problem - Page 1
Forum section: electronics / beginners

author: mike_mike
author_rank: Super Contributor
timestamp: April 23, 2024, 04:59:24 am
content: Hi! I recently bought a new oscilloscope upo1102cs from uni-t. It is working ok, until I connect it using utp cat5e cable to the router. On the same router is connected the pc. The wan cable that enters into the router is coming from the main router. I can easily access the oscilloscope from the pc, I can see the waveforms on the pc, but if I navigate in the menu of the oscilloscope webpage, after a while it appears again the login screen, and after I enter the username and password, it gives me a error and the oscilloscope freezes on the benchtop and it gives me a time out error on the pc.What should I do ?

author: aliarifat794
author_rank: Regular Contributor
timestamp: April 23, 2024, 07:45:17 am
content: If possible, assign a static address to the oscilloscope.

author: dcbrown73
author_rank: Regular Contributor
timestamp: April 23, 2024, 11:21:34 pm
content: If it's freezing up, I would check for firmware updates also. It could be a known issue that is already resolved in firmware.
Oscilloscope - Pulse Mode & Auto Mode Trigger - Page 1
Forum section: electronics / beginners

author: 2X
author_rank: Frequent Contributor
timestamp: April 20, 2024, 10:06:33 pm
content: Hello,I have the oscilloscope RTC1002 and I would like your opinions about a signal that I measured. I have the signal (Pictures 1 & 2) and the oscilloscope couldn’t trigger capture (stabilize) the waveform in auto mode. I set ON the oscilloscope function Hold-Off trigger mode; I measured the duration of the repetitive pulses and was 19,6uS, so I set the Hold-Off time at 20uS. Then the oscilloscope was triggered fine and the waveform was clear captured (without “ghost signals”) and stable (not moving like a train).After the hold-off trigger mode I tried to capture the pulses of another slightly different waveform using this time the Pulse mode; I measured the duration of a single pulse (not all the pulses at this waveform had the same duration and are not total square with 90 degrees fall and rise transitions) and it was 192nS (Picture 3). I set the parameter of the Pulse mode function to trigger when it will find a signal smaller than 120nS (reference time). If I leave the Hold-Off enabled at 20uS the oscilloscope was triggered fine (Picture 5) on the first pulse were found with a duration smaller than 120nS, but the strange thing for me is that if I disabled the Hold-Off function the oscilloscope starts to show on the screen some “ghost signals” (Picture 4).As I understand these “ghost signals” maybe must be due to the jitter effect, but why when I am on the Pulse mode and I turn off the Hold-Off time then only I saw these ghost signals? If the Pulse mode is active isn’t supposed that the auto trigger is no active and trigger only occurs under specific circumstances where have to do only with pulse duration?In the auto trigger mode as I know the trigger will occur even if a specific conditions of trigger level (independently of the trigger level that was set) doesn’t met, so there is a timer where waits about the specific trigger conditions to be met and if will not after a certain time?) the trigger will occur independently or there is a different mechanism/logic behind the auto trigger mode? This auto trigger time can be changed or just we go on normal mode to do that?Pulse Mode Function - Manual Pages 52-53:https://scdn.rohde-schwarz.com/ur/pws/dl_downloads/pdm/cl_manuals/user_manual/1335_7352_01/RTC_UserManual_en_07.pdf

author: aliarifat794
author_rank: Regular Contributor
timestamp: April 22, 2024, 09:47:08 pm
content: Auto-trigger mode is typically used when you want the oscilloscope to automatically trigger regardless of the input signal characteristics. It has a built-in timer that waits for trigger conditions to be met. The auto trigger time is usually fixed within the oscilloscope's firmware and isn't user-adjustable.
Oscilloscope question #1 - Page 1
Forum section: electronics / beginners

author: Russ
author_rank: Regular Contributor
timestamp: January 31, 2018, 01:34:00 pm
content: A 6.2 Ohm Resistor and a 100 mH inductor are connected in series, across a 10 Vpp, 9.87 kHz sine wave power source. What is the impedance of the circuit?A. 3.1 kOhmsB. 6.2 kOhmsC. 8.8 kOhmsD. 12.4 kOhmsThanks

author: rstofer
author_rank: Super Contributor
timestamp: January 31, 2018, 01:41:00 pm
content: Answer is B, 6.2 kOhmhttp://keisan.casio.com/exec/system/1258032600

author: Russ
author_rank: Regular Contributor
timestamp: January 31, 2018, 02:04:21 pm
content: Quote from: rstofer on January 31, 2018, 01:41:00 pmThank you. Awesome APP. Where do I find and download it?Thanks

author: Mukrakiish
author_rank: Contributor
timestamp: January 31, 2018, 02:14:33 pm
content: Quote from: Russ on January 31, 2018, 02:04:21 pmHonestly, the formulas are on the website. Not trying to be rude, but that's the most you should require other than a standard calculator to make the math quicker to process. Especially for homework/tests (websites/apps don't help on tests).
Oscilloscope question  - Page 1
Forum section: electronics / beginners

author: Crambone
author_rank: Frequent Contributor
timestamp: November 15, 2019, 02:25:16 am
content: So my scope (RIGOL) has an auto feature and can read frequency (MHz) if I want to read the frequency coming from an Op Amp or IC can I use the scope for this? Also do I use the 1x/ 10x probe that came with it?

author: Shock
author_rank: Super Contributor
timestamp: November 15, 2019, 03:35:43 am
content: If you mean can an oscilloscope be used to take a signal measurement such as the frequency, yes that is what they are for. Yes you use the probe that comes with your oscilloscope. Just be careful never to connect the ground clip to a live voltage with respect to ground as it will create a short. The limitations of the oscilloscope such as maximum input voltage are outlined in the manual.

author: kg4arn
author_rank: Unknown
timestamp: November 15, 2019, 10:01:24 am
content: Use the 10x setting on the probe unless you are sure the circuit under test can tolerate the higher capacitive load of the 1x setting.I recommend the W2AEW YouTube channel.He has a whole series on using oscilloscopes and it is worth every minute, if you want to learn.

author: Crambone
author_rank: Frequent Contributor
timestamp: November 16, 2019, 05:34:15 am
content: Thanks guys! I will check out those videos.
Oscilloscope question  - Page 1
Forum section: electronics / beginners

author: LuisLDias
author_rank: Contributor
timestamp: April 05, 2016, 08:32:10 pm
content: Today I was working on my new project, when a turn my oscilloscope a say some strange wave forms on it. The leads were plugged but not connected to anything.I recently change to a new home and it the first time I saw this. The freq is about 50Hz. It's some kind of main's interference?

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: April 05, 2016, 09:14:57 pm
content: The probes are basically an antenna, so there's generally going to be something picked up from your environment. You can try moving around the probe cables, coiling them, etc. and minimize it.Generally, though, it won't have much (or any) impact on your measurements.

author: danadak
author_rank: Super Contributor
timestamp: April 05, 2016, 11:31:59 pm
content: Its 20 mS period, 50 Hz, AC line pickup, very common problem as buildingsare full of power wiring radiating magnetic and E fields.The fact the waveforms not pure sinusoid has to do with AC line loads, motors,microwaves power transformers, LapTop bricks, small appliances....all generating crud.Regards, Dana.

author: Paul Price
author_rank: Super Contributor
timestamp: April 06, 2016, 12:01:27 am
content: You might be using a desk lamp on or above your workbench that has a fluorescent tube or VFL lamp with a ballast.The sharp spike in the observed waveform is the flash-over of the gas in the tube as the voltage rises high enough to cause an avalanche of current flow, the short ramp up next is due to the lamp's gas drawing increasing current thorugh the ballast, and the sharp drop back down to 0-V is the lamp voltage falling below the ignition point and current stops flowing..the same waveform repeats on the negative side of the cycle.
Oscilloscope questions. - Page 1
Forum section: electronics / beginners

author: Jolijar
author_rank: Newbie
timestamp: March 15, 2017, 05:54:24 pm
content: Hello everyone this is my first post. I have been a long time watcher of the YouTube channels. I have a mechanical background and am getting into electronics as a hobby. My interests in electronics are mostly in motor controller design. I build small combat robots. I just picked up my first oscilloscope at an auction for $70It is a Tenma 72-8395 25mhz 250MS/sIt came without probes so I haven't gotten to play with it yet.I have a couple of questions I was hoping you guys could help me with. I am going to dig into the tutorial resources here to absorb as much info as I can.Questions1.) Is there anything besides probes that I should pickup for my scope?2.) There is a round connector BNC? (its the same as the probe connectors) on the back of the scope. It is unlabeled. Any idea what this is for?3.) My google fu as failed me any ideas of the value of the scope I got? (I don't intend to sell it just curious)

author: DIPLover
author_rank: Regular Contributor
timestamp: March 15, 2017, 06:21:58 pm
content: Hello, you can find the manual for your scope at this addressdatasheet.octopart.com/72-8380-Tenma-datasheet-8624789.pdfBNC on the back is probably trigger output.

author: w2aew
author_rank: Super Contributor
timestamp: March 15, 2017, 06:33:48 pm
content: The UNI-T version of the manual seems to indicate that the rear-panel BNC connector is a Pass/Fail output:https://www.element14.com/community/servlet/JiveServlet/download/20736-2-3611/173-9448.pdf

author: james_s
author_rank: Super Contributor
timestamp: March 16, 2017, 05:10:33 pm
content: You can use a plain wire as a probe in a pinch, if you don't have any BNC connectors just poke a wire in the middle of the BNC jack and then twist a ground wire around the outside of the jack. Obviously this is not going to give you stellar performance but it will work well enough to let you play around with the scope on frequencies up to a few tens of kHz or so.The importance of probes is often overlooked. Cheap ones often do not meet the stated specifications and can be unreliable so it pays to do some research and get something decent. You might look for some used probes from a reputable brand like Tektronix or HP/Agilent/Keysight rather than getting generic Chinese probes. Personally I would look for probes rated to at least 100MHz, if you end up sticking with electronics there is a good chance you will eventually want a higher bandwidth scope.