hybridfree/eevblog-posts huggingface dataset:
DE5000 odd reading - Page 1
Forum section: electronics / testgear

author: ImpulsiveJames
author_rank: Contributor
timestamp: April 04, 2024, 09:04:48 pm
content: I purchased a DE5000 to test a lot of capacitors from an amplifier. They are all 4700uf 100v. Most of them are reading 4500uf, which I'm expecting is normal from 15 year old capacitors.My question is, one of them is reading 1pf with the DE5000, but 4800uf with a cheap honeytek meter.What could cause this? I know the cap is junk, but I'm just curious why there is such a difference and how they could be so far off.

author: Dr. Frank
author_rank: Super Contributor
timestamp: April 04, 2024, 09:25:37 pm
content: Hopefully, you always have properly dis-charged the capacitors, before measuring them with the DE5000.Otherwise, you might have damaged the instrument by over voltage.Please check your both devices with a known-good capacitor.If both still work, the difference might be due to very different measurement techniques.Also, try different frequencies and parallel / seriell capacitance modes.Frank.

author: wraper
author_rank: Unknown
timestamp: April 04, 2024, 09:27:11 pm
content: Lower the frequency. It should be 120 or 100 Hz.

author: Martin72
author_rank: Super Contributor
timestamp: April 04, 2024, 10:54:49 pm
content: QuoteSuch a value would also be normal for new electrolytic capacitors, as their tolerances are usually 10 or 20%.Unlike in e.g. switching power supplies, electrolytic capacitors in an (audio) amplifier have an almost paradisiacal life, which can last a very long time if the ambient temperature is not high.
Rigol DHO802 - touch screen input doesn't work - Page 1
Forum section: electronics / testgear

author: sgnka
author_rank: Contributor
timestamp: April 05, 2024, 02:56:09 am
content: I just bought a Rigol DHO802 last week from their Amazon store and opened it up today. The scope boots up fine but the touch input does not work (the screen is fine). I have tried the Touch Lock button (it shows Touch enabled) and also restore default buttons and rebooting the scope but the touch screen input does not work at all. Anyone else face this? I find it quite unlikely that it should be a hardware fault on a new scope. Are there any options in firmware that might help? I can return it but if there's any ideas which can help get it working I'd like to try those out first. Thanks!

author: Caliaxy
author_rank: Frequent Contributor
timestamp: April 05, 2024, 03:14:13 am
content: Bummer. It’s from Amazon, so you know what to do nextThe wiggly lines on screen look nice, though.
Advantest R4945A EEPROM Programmer - Page 1
Forum section: electronics / testgear

author: ZGoode
author_rank: Frequent Contributor
timestamp: April 02, 2024, 07:02:45 pm
content: I have access to an Advantest R4945A EPROM programmer and was wondering what peoples thoughts were on this particular unit. I'm really only looking to program the various "27" series of UV eproms available. I'm mainly going to be using it for working on older HP equipment or similar from the 90's and older. I already have stuff for SPI and I2C eeproms, but don't have something set up for parallel UV ones yet.
Ads on Siglent scopes? - Page 1
Forum section: electronics / testgear

author: hallkbrdz
author_rank: Contributor
timestamp: April 01, 2024, 01:02:30 pm
content: Hopefully this is an April fools joke...https://m.facebook.com/story.php/?id=100063761299711&story_fbid=940426561426045

author: audiotubes
author_rank: Regular Contributor
timestamp: April 01, 2024, 01:23:29 pm
content: LOLWell, now that the license hack script is pretty much everywhere I guess it would be stupid but in the end wouldn't matter.If they announce they got bought out by google, then we will know the ad thing is serious and should have been posted yesterday or tomorrow

author: jjoonathan
author_rank: Frequent Contributor
timestamp: April 01, 2024, 01:30:10 pm
content: Ha! Usually companies are complete chickens with April 1 jokes. This is a brave one

author: KungFuJosh
author_rank: Super Contributor
timestamp: April 01, 2024, 02:41:53 pm
content: That's hilarious. People worrying about that being real make it even funnier.

author: hallkbrdz
author_rank: Contributor
timestamp: April 01, 2024, 03:49:23 pm
content: With today's business climate, you never know.Subscriptions for everything... Don't want to watch ads - pay more every month!Hate it.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: April 01, 2024, 09:38:00 pm
content: Nice one Siglent..

author: Zoli
author_rank: Frequent Contributor
timestamp: April 01, 2024, 10:02:22 pm
content: Now imagine Rigol ads on the Siglent screen

author: KungFuJosh
author_rank: Super Contributor
timestamp: April 01, 2024, 10:04:55 pm
content: Quote from: Zoli on April 01, 2024, 10:02:22 pm"Are you tired of working with a thoroughly beta tested and reliable scope? Do you want a noisier front end? Try Rigol today!" 🤣🤣🤣🤣🤣
Opinion sought  on Sony Tektronix AWG 2005 Arbitrary Waveform gen for home use - Page 1
Forum section: electronics / testgear

author: mr ed
author_rank: Regular Contributor
timestamp: April 02, 2024, 11:35:31 pm
content: These awg's seem to be relatively cheap and some come with 4 channels (for x,y,z app). They are 68000 based (not windoz) and have a floppy i/o and GPIB, SMD construction. (Siglent etc not very appealing to me, as I need some level of repair work just to keep busy).Downside is board only service manual. I can service most things with schematics so a lack of diagrams may be an issue.And firmware in flash, I suppose, hard to make copy of flash with surface mount components. How likely will flash fail in the next few years?I could also put in a lcd and floppy to usb stick adapter if necessary.And so, like that, and what are the failure points? CRT, power supply, then what? Usability? ( I can write python to drive gpib easily.).
Upgrade Korad KA-3005 to next level - Page 1
Forum section: electronics / testgear

author: Feuerbard
author_rank: Contributor
timestamp: April 01, 2024, 08:58:42 am
content: found on youtubehttps://github.com/profi-max/Modern_KORAD

author: ebastler
author_rank: Super Contributor
timestamp: April 01, 2024, 10:29:38 am
content: That is an impressive feat! I skimmed the github repository, but am not entirely clear about the technical concept: Does the microcontroller on the Korad main PCB also get new firmware? (I did not see any.) Or does the touch display's firmware make the display fully compatible with the standard LED display it replaces? (In which case, how does the touch control get fed back to the main processor??)Thanks if anyone can shed more light on this!

author: kloetpatra
author_rank: Regular Contributor
timestamp: April 01, 2024, 07:46:32 pm
content: Amazing project. Better look and feel than some top brand PSUs. Luckily I'm already in posession of both products. I will definetly do the mod when I got some spare time.@ebastlerNo firmware update for Korad needed. The display module is controlling the Korad via UART interface and some extra data lines. That's why it's only working with the programmable verison of Korad (DP/P).https://github.com/profi-max/Modern_KORAD#how-it-works

author: radiolistener
author_rank: Super Contributor
timestamp: April 01, 2024, 09:29:09 pm
content: I suspect using high speed MCU with touch display make a lot of noise which is not acceptable for lab PSU.I'm not happy with the original Korad KA3005 noise that the current low-speed controller makes when dynamicly updating the LED display, what can we expect from this miracle?
Oscilloscope probe questions - Page 1
Forum section: electronics / testgear

author: Sniper1
author_rank: Regular Contributor
timestamp: April 01, 2024, 06:17:21 pm
content: So I know when to use ac coupling and differential probes. But what is the use case for ac coupled differential probes? Asking since besides rf stuff I can't imagine a use case where you would want ac coupling instead of dc. Maybe to reduce input capacitance a bit I can't think of anything else. Can anyone enlighten me please.Also what is the proper schematic?I know that this is the simplified schematic for single ended DC and AC coupled probesFor differential DC it is this:https://postimg.cc/d739NDb6But for AC coupled differential i cant get some good schematics online and am not sure if it is something like the upper one or the lower one?https://postimg.cc/23kn01nZThe upper one sort of makes more sense since it is symmetrical input but i am not sure if it is useful IRL since it will only probe pure AC signalsThe lower one makes sense in the way that it uses a line as a reference then removes the DC offset from another line BUT it will distorts the thing that is probed a lot more on 1 line then the other .Can someone please explain how AC coupled differential probes work ? or direct me to some good resources? (not sure if they even exist IRL [i sort of filled the gap in the probe types....)
Tek 2755Ap: missing +9V - Page 1
Forum section: electronics / testgear

author: Martin.M
author_rank: Frequent Contributor
timestamp: March 29, 2024, 01:46:51 pm
content: hello friends and happy easter,I have the following problem:Tektronix Spec: 2755Apmissing +9VI have not found application or manual.There is a rest voltage around +1,2V, so it may be possible anywhere is a LM317 with a bad 240 ohms to ground: the only logical answer to this voltage.But I don´t want to make shitty work here, this is a wonderful instrument. So please dear insiders, where I have to look for this problem?It`s a ESD home, so I don`t like unscrew too much parts.thank you for a tip and greetings from germanyMartin

author: Testtech
author_rank: Regular Contributor
timestamp: March 29, 2024, 09:25:27 pm
content: Check the fuses under the little cover on top of the PSU.

author: shakalnokturn
author_rank: Super Contributor
timestamp: March 29, 2024, 11:04:00 pm
content: You'll find at least the 494 schematic on KO4BB's website (think of donating once in a while, all the traffic and site maintenance cost him).On these SA's à lot of tantalum capacitor problems with age.

author: KE5FX
author_rank: Super Contributor
timestamp: March 30, 2024, 02:41:38 am
content: All of the 275x models are rack-mount versions of one 49x model or another. The 2755AP is a repackaged 492BP if I recall correctly. Basically a 494AP with 100 Hz minimum resolution rather than 10 Hz.I'd probably use the 494AP manuals from ko4bb.com to troubleshoot it; the 494 manuals may be a little too old.

author: Martin.M
author_rank: Frequent Contributor
timestamp: April 01, 2024, 11:05:37 am
content: Quote from: Testtech on March 29, 2024, 09:25:27 pmthank you. 2A was blown.LM317 at front board was defect, also the driver transistor for ON/OFF the light.
HP 41800a conductive rubber behind the tip replacement source? - Page 1
Forum section: electronics / testgear

author: Kofen
author_rank: Regular Contributor
timestamp: March 30, 2024, 04:53:25 pm
content: I have a couple of HP 41800a probes and recently I experienced that they had stopped working since last time I used.They showed no LF response and 15db+ insertion loss, looked exactly like an open circuit.Turns out, the probe tip are electrically connected to the LNA via a gray conductive rubber cylinder, that had of course deteriorated.I have a few new tips so I was able to restore the operation of the probes, new tip, all good again!But it got me thinking that sooner or later, the rest of the tips rubber will deteriorate and I am looking to see if anybody knows what HP used for these tips?Initially I thought of just ordering new tips, but Keysight wants 614 dollar a piece!! Take care of your tips folks!
Rigol RSA3015N hacking or cheap options - Page 1
Forum section: electronics / testgear

author: drew23
author_rank: Contributor
timestamp: February 27, 2024, 10:10:58 am
content: Hi All,I have a Rigol RSA3015N spectrum analyser and was wondering if there are any hacks to access the optional capabilities.Alternatively, is there anywhere to buy cheap option keys?The RSA3015N is a great spectrum analyser, especially in its real-time mode.Regards Drew VK4ZXI

author: EE-digger
author_rank: Frequent Contributor
timestamp: March 29, 2024, 02:54:50 pm
content: I think the lack of response speaks volumes about the state of this topic. The reason, I believe, is the super low prices on the Siglent products and their seemingly endless hackability. From what I've seen with my hands on an RSA3030E I suggested a client buy last October, it's a well built product, not up to Agilent / Keysight standards, but very nice. My concern on the N models is the very limited cal kit support. Only 3 kits consisting of one of their kits, a second one with zeroes for all constants and a third, custom. That's pretty poor as you'd have to store a STATE setup for your kit X, run a cal and save under "cal with kit X" for instance, same for Y and Z, etc.How do you like your unit?

author: drew23
author_rank: Contributor
timestamp: March 30, 2024, 03:01:44 am
content: HiThanks. I have been surprised at the lack of interest too. The RSA3015N is a very capable spectrum analyser. I bought it to replace a Siglent SSA3021X Rev A, itself not a bad instrument. For me, it was the performance for a limited budget. I did think it could be hacked as per Rigol DSOs, but sadly not.The real-time SA of the Rigol is very good. I can see all sorts of things that are just not shown in sweep mode.Most recently I have been using it to investigate phase noise of oscillators. I believe it to be wise to look at an oscillator's signal on an SA in conjunction with a phase noise analyser. I was surprised at the amount of spurious noise from big-name vector signal analysers, as well as cheap frequency synthesizers. If you are interested I have done a couple of posts to my blog.The Rigol SA has an excellent OCXO, on par with my R&S and Anritsu signal generators, with low phase noise and very accurate frequency compared to a Rubidium-GPSDO.I wonder how many people on EEVblog work with RF. There are endless discussions on oscilloscopes but very little on SA. I am a radio amateur and rarely use a DSO, whereas I use a SA or VNA all the time.Regards Drew VK4ZXIhttps://vk4zxi.blogspot.com/2023/07/an-economical-way-to-measure-phase.htmlhttps://vk4zxi.blogspot.com/2024/02/pn2060a-ghz-phase-noise-measurement.html

author: tv84
author_rank: Super Contributor
timestamp: March 30, 2024, 10:03:35 am
content: Quote from: drew23 on February 27, 2024, 10:10:58 amThere are.
Question about gore cable (help with type identification) - Page 1
Forum section: electronics / testgear

author: IAmBack
author_rank: Regular Contributor
timestamp: March 28, 2024, 11:44:08 am
content: It is marked as T6CO1...I can't find what T6 means. I know that it is type of cable, but I wold like to know more...

author: TheSteve
author_rank: Unknown
timestamp: March 28, 2024, 03:07:33 pm
content: Is that the full part number? If it is then it was likely produced for someone else.The C01 would normally be a TNCA male connector.

author: IAmBack
author_rank: Regular Contributor
timestamp: March 29, 2024, 08:41:07 am
content: No, the full number is longer, but I don't would like to decipher "T6", which tells about type of the cable.

author: TheSteve
author_rank: Unknown
timestamp: March 29, 2024, 04:32:06 pm
content: Did you email and ask them?
IFR Com 120A destortion meter error at boot-up - Page 1
Forum section: electronics / testgear

author: sfoweatherman
author_rank: Newbie
timestamp: March 28, 2024, 03:51:05 am
content: Question:During my Com 120A boot-up/initialization, it reports an error on the screen regarding the distortion meter. If you go into the test procedures, and do the full test, the message on the destortion meter says: PASS. I've been told that it is a capacitor problem. If that is so, would the problem be on the controller tray?Thanks in advance,David

author: M0HZH
author_rank: Regular Contributor
timestamp: March 28, 2024, 12:13:28 pm
content: Hello,Indeed, it is most likely an issue caused by a failing capacitor. The Baseband Tray handles the distorsion meter function (as well as other functions, which you might see fail soon) and it was plagued by a batch of bad capacitors. Just take the tray out and replace all of them, about 50 pcs. I also did the Digital, Analyzer and Generator trays on my IFR COM120B.Let me know if you need documentation, I have the manuals & schematics.Cheers,Razvan

author: sfoweatherman
author_rank: Newbie
timestamp: March 28, 2024, 10:10:47 pm
content: Thank you sir for the info. I will asses the board. Since the caps are all extra mini in size, I'll try to find the culprit...David
Meaning of -NV-AV marking in TDS5054B scopes - Page 1
Forum section: electronics / testgear

author: minatko
author_rank: Newbie
timestamp: March 28, 2024, 05:24:11 pm
content: Hello everyone.I'm going to buy one of these scopes and I see some of the offers have -NV-AV suffix added to the title.I tried to read what this can mean but I just came across some contradictory statements.In one thread on this forum a guy said that this means record length reduced by half, but there definitely are so called "options" like Opt 1M determining the length.Tekwiki says -NV means the scope lacks a touch screen, but again there is TDS5BUP Option 18 adding the touch screen.Does anyone know what does this suffix mean exactly? Or at least which one is better with or without the suffix?
Equipment identification help?  - Page 1
Forum section: electronics / testgear

author: Crambone
author_rank: Frequent Contributor
timestamp: March 28, 2024, 05:11:11 am
content: Ok I have a habit of looking at pieces of equipment I’ve never seen and looking it up and checking specs, oporation…. And this one has me lost can’t find anything. I thought at first Leader Signal or Function Generatror.Make? Model? Anyone?Drew

author: PA0PBZ
author_rank: Super Contributor
timestamp: March 28, 2024, 10:10:15 am
content: Either a sibling or a modified one of these:http://www.sunequipco.com/electronic%20test%20and%20measuring%20equipment/audio%20counter/AG2603AD.HTM
Siglent EasyWaveX Arbitrary Signal Gen Software:  Sub-Hz Display Problem - Page 1
Forum section: electronics / testgear

author: Bcavender
author_rank: Newbie
timestamp: March 27, 2024, 07:28:04 pm
content: I am trying to use EasyWaveX to create a arbitrary waveform that has a frequency component that is lower than 1 Hz. I cannot get the software to display the full waveform of any expression less than 1 Hz.It appears that the waveform display always displays 2 Pi radians of the output equation. This is fine if the signal you are generating is over 1 Hz. However, if I have a wave that is longer than 2 Pi, only 2 Pi radians of the waveform is displayed and the rest of the signal is truncated and not displayed.See the equation with a 10Hz frequency riding on a 0.5Hz signal where only the first half of the total waveform is displayed.This case is trivial as the second half would be a mirror image, but if you were working with a 0.1 Hz frequency, then 90% of the total desired waveform would be unavailable for the engineer to view.Let's look at a waveform with a freq of 0.1 Hz.When the frequency goes lower than 1 Hz, the arbitrary wave becomes less than 2pi (aka 0.1pi in my example). However, it appears that the EasywaveX software is limited by it's display software to be unable to display waves longer than 2 pi (or any Sub-Hz signal). As in this case of the 0.1Hz signal ... where 90% of the wave is not displayable.If you are doing very low frequency work, EasyWaveX appears to be unusable.If there was a way to adjust the graph display to display 4 Pi radians of samples (or more) to fully display the entire waveform would seem to be a simple way to correct this deficiency.(Changing the number of samples or frequency in Settings appears to have no effect on the waveform display.)Has anyone else seen this problem, have a solution I have not seen in displaying Sub-Hz waveforms with the Siglent Signal Generators?I have been well satisfied with the hardware that I have purchased from Siglent, but this seems like a major oversight in the EWX software for any engineering project dealing with very low frequency projects ... presuming I haven't missed something after trying to get it to work for a couple days.All comments welcome towards a solution!Thanks!B
ANENG ST212 DC/AC Clamp Meter - Page 1
Forum section: electronics / testgear

author: Aldo22
author_rank: Super Contributor
timestamp: March 27, 2024, 12:12:10 pm
content: Today I got something cheap again.An Aneng ST212.Since there's nothing to be found in this forum except a rant about a defective device, I'll start a thread. Cheap things have a right to existIt's the cheapest AC/DC clamp meter I've found (<$20).I'm really only interested in the DC current part (car).I wasn't expecting much other than a rough overview of the current flowing.The size and feel are quite pleasant for the price. The operation takes some getting used to.I am positively surprised how well it works.
JBC FAE1 KIT1 Fume Extractor - Opinions - Page 1
Forum section: electronics / testgear

author: 2X
author_rank: Frequent Contributor
timestamp: March 26, 2024, 08:42:14 pm
content: Hello,I want to buy a good quality fume extractor that will not just suck the air from my head and send just little further. I want a proper/quality air filtering for health issues. Does anyone have experience with this particular JBC fume extractor? Is it trusted?FAE1 KIT1 Fume Extractor Kit for 1 Workbenchhttps://www.jbctools.com/fae1-kit1-fume-extractor-kit-for-1-workbench-product-2384.htmlhttps://www.jbctools.com/fae1-200-filter-for-fae1h-fume-extractor-product-2381.html

author: thm_w
author_rank: Super Contributor
timestamp: March 26, 2024, 09:38:13 pm
content: Not a ton of info out there for JBC as the price is so high ($2k). If you have that sort of budget and want the integration with other JBC products I'm sure its fine.https://www.tequipment.net/JBC/FAE1-KIT1/Fume-Extraction-Units-&-Kits/If you don't, weller zero smog or hakko fa430 or equivalent probably makes more sense:https://www.tequipment.net/Hakko-FA-430-vs-Weller-Zero-Smog-EL/https://www.eevblog.com/forum/reviews/fume-extractor-weller-zero-smog-el-or-ersa-easy-arm-1/French teardown:

author: 2X
author_rank: Frequent Contributor
timestamp: March 26, 2024, 10:36:24 pm
content: If you have to suggest me any other way/setup(photos) of ventilation like a custom fume's hood with an outdoor motor.Is it stragne or am I wrong? There no many informations, videos or pictures about soldering fumes ventilation and instead there thousands videos of soldering and soldering stations.

author: thm_w
author_rank: Super Contributor
timestamp: March 26, 2024, 11:55:55 pm
content: Yes vent to outdoors is simple and effective for hobbyist. If you are a business you may want to check local laws and if you are allowed to open vent holes or use existing windows.We have threads you can read through:https://www.eevblog.com/forum/reviews/is-there-a-cheapcompact-fume-extractor-better-than-a-bare-120-mm-fan/There is not a lot of good information, no, because its not required to solder and legislation is not so strict. So people only look into it after a while when they realize their room is full of smoke.
Elpan EG-20 linear sweep generator confusion - Page 1
Forum section: electronics / testgear

author: bborisov567
author_rank: Regular Contributor
timestamp: March 26, 2024, 10:33:28 am
content: Hello, i have some questions about a generator. I have this Elpan EG-20 linear sweep generator. My goal is to use it to generate a frequency sweep (chirp). Unfortunately i can't find any information, manual or schematic about it on the internet. So far i was able to generate only a sawtooth waveform with a low frequency. I am not sure why there is a separate BNC connector for amplitude. The second connector seems to be the output - the sawtooth waveform is present there. And the third one looks to be an external trigger input?Also what is the purpose of the two potetiometers on the far right labeled "Wrong adjust"? Could somebody shed some light about this generator?

author: ebastler
author_rank: Super Contributor
timestamp: March 26, 2024, 11:57:35 am
content: As the name of the instrument suggests, it can generatesweeps-- i.e. the sawtooth (ramp) function you see. It cannot (on its own) frequency-modulate a higher frequency carrier wave with that ramp signal. If you have a separate signal generator with an external modulation input, you could modulate that device with the output from your sweep generator.I don't know what the two potentiometers on the right control. But the label "Wrong Adjust" does not seem to refer to the potentiometers directly, but to an indicator LED next to the label?

author: bborisov567
author_rank: Regular Contributor
timestamp: March 26, 2024, 01:29:06 pm
content: Also what is the difference between the "triangular waveform" and the "rising edge" mode. On the second there is nothing on the output."Wrong adjust" seems to be for the LED indeed. The "Uh -5" labels have to for the potentiometers. I guess they adjust some voltage?

author: ebastler
author_rank: Super Contributor
timestamp: March 26, 2024, 01:47:58 pm
content: Quote from: bborisov567 on March 26, 2024, 01:29:06 pmI don't have or know that specific generator, so I can just offer educated guesses:The triangular waveform must select regular ramp mode, with the slew rate adjusted by the potentiometer, in a range selected by the set of V/s range buttons. I would expect that there is also a way to change between sawtooth signals, with either rising or falling slope, or symmetrical triangular signals. Maybe the two pots on the far right can adjust the rising vs. falling slope?The step function is less clear to me. A pure square wave output does not seem to make much sense in a "sweep generator". Seeing that the front panel also talks about "staircase trigger", maybe there is a mode where the ramp is not smmooth but increases in discrete steps, and you adjust the step height instead of the slew rate? [Edit: This mode may need the "staircase trigger" to do anything? Have you tried feeding a signal to that BNC, or pushing the "manual" button there?]
Sanko GH60 6GHz Handheld Vector Signal Generator Review, Teardown & Experiments - Page 1
Forum section: electronics / testgear

author: Hugoneus
author_rank: Frequent Contributor
timestamp: March 25, 2024, 02:53:06 am
content: In this episode Shahriar shows an extensive review of the Sanko (BirdRF) GH60 GeneHawk handheld vector signal generator which operates from 10MHz – 6GHz. With up to 100MHz of modulation bandwidth (licensed) the unit has good potential for a portable wide-band communication signal generator:https://www.sankorf.com/products/portable-signal-generator-gh60This review is organized as follows:00:00 – Introductions, unit overview, operating system & GUI initial impressions02:33 – Detailed teardown, construction, RF & baseband board analysis19:16 – Frequency accuracy and stability measurements20:31 – Output power measurement, power linearity and minimum output power24:28 – CW signal analysis, noise-floor, harmonic behavior and spurious tones27:15 – Phase noise characterization, spurs and far-out noise floor28:41 – Two-tone generator, TOI (OIP3), image rejection, LO rejection, intermodulation tones31:13 – Pulse generation, minimum pulse behavior33:36 – Linear frequency generation measurements & characteristics34:58 – FM, AM & PM capabilities and characterization methods, multi-modulation options37:22 – Frequency sweep behavior and limitations40:07 – Custom digital modulation, EVM measurements, I/Q & magnitude error, equalization43:05 – Real-time AWGN performance and measurements44:00 – Other software features, up-coming API and waveform standards44:44 – Concluding remarksPlease consider supporting The Signal Path:https://www.TheSignalPath.com/Donatehttps://www.Patreon.com/TheSignalPathYou can watch the video here: [46 Minutes]youtu.be/qyi6UkvJy7I

author: Hugoneus
author_rank: Frequent Contributor
timestamp: March 25, 2024, 02:18:56 pm
content: Please feel free to post any question on the YouTube comment section.

author: eb4fbz
author_rank: Regular Contributor
timestamp: March 25, 2024, 07:38:42 pm
content: It is a rebadged Transcom GeneMini:https://transcom.net.cn/prod/183/detail/30008

author: Hugoneus
author_rank: Frequent Contributor
timestamp: March 25, 2024, 07:40:48 pm
content: Quote from: eb4fbz on March 25, 2024, 07:38:42 pmInteresting! There is a lot of re-branding in this market it seems.
can multimeter AC mode measure audio frequency voltage?  - Page 1
Forum section: electronics / testgear

author: loop123
author_rank: Frequent Contributor
timestamp: March 25, 2024, 03:38:58 am
content: Is a multimeter in AC mode able to measure only 60Hz or 50Hz power line voltage? Does it have a brick wall frequency filter such that it can only measure 60Hz or 50Hz? If not, what if the signal is audio range 20hz to 20000Hz. How do you compute how the measurement would be off when other frequencies are used?Also for AC mode. Does it only measure higher voltage? In the following video, the source is 80mV 50Hz. why do the measurement results jump up and down in values?https://www.youtube.com/shorts/VU0DDpj5_04?feature=share

author: bdunham7
author_rank: Super Contributor
timestamp: March 25, 2024, 03:43:15 am
content: The answers to all your questions depend on which meter you have and that information is found in the specifications. Some meters won't measure accurately above 400Hz and others work fine to 100kHz or more. Some meters don't have lower AC ranges, there's one where the lowest range is 200VAC and it has 2000 counts. However, if your meter has a 400mVAC range it should indicate 80mVAC without any problems--so I don't know what is going on in your video.

author: loop123
author_rank: Frequent Contributor
timestamp: March 25, 2024, 03:58:24 am
content: Quote from: bdunham7 on March 25, 2024, 03:43:15 amThat's great idea, to check the manual. Good I still found the 20 year old manual. What kind of signal source or even defect can usually make the values jump up and down like in the video in last message? It's a 80mV 50H sine wave source. Btw.. if the source is 110V or 220V AC, the display is steady and doesn't jump.

author: bdunham7
author_rank: Super Contributor
timestamp: March 25, 2024, 04:04:12 am
content: Quote from: loop123 on March 25, 2024, 03:58:24 amTypically noise, either in the signal or internal to the meter somehow. What is the source for the 80mVAC?

author: vk6zgo
author_rank: Super Contributor
timestamp: March 25, 2024, 04:20:51 am
content: I've only used an early Beckman & a Fluke 77 to verify that the local audio generator and level meter at a few Radio & TV sites, were correct at 0dBm----obviously not as a standard, but it would show that the audio tones were in the "ball park"or not.Both DMMs read around 0.774v with 440Hz or 1kHz into a 600 ohm termination (as did an AVO model---near enough!I never tried them for tones above those frequencies----the Fluke didn't like 15.625 kHz TV horizontal frequency in the least, when I tried to look at that.As far as the 80mV at 50Hz is concerned, there is the definite possibility of stray pickup on unshielded leads.
Can multimeters be powered by DC-DC buck converters? - Page 1
Forum section: electronics / testgear

author: SteveLTN
author_rank: Contributor
timestamp: March 26, 2024, 08:46:51 am
content: I have a few Lithium AA/AAA batteries which have USB-C ports and can be charged directly.They always produce flat 1.5V until they die suddenly. I'm pretty sure they use Buck converters inside to step-down from Lithium cell's voltage to 1.5V.I like them fairly well because a lot of devices have fairly high shut-down voltage which makes Ni-Mh batteries not very suitable. But these Lithium ones are compatible with these devices very well. Of course one problem is that you can't estimate the battery life. But with easy USB-C charging, I'm not super bothered by this.----The question is, can I use these batteries in multimeters?Using buck converters mean they don't produce stable 1.5V. They must have ripple voltage. While it doesn't matter for most of my appliances, I'm unsure it they are suitable for multimeters.Can multimeters deal with that? Or would it cause any long-term inaccuracy or damage to the meters? I did do a simple test, it seems fine. Just want to confirm from a theoretical and long term point of view. Thanks!----PS.I have a 9V USB-C chargeable Lithium as well. It's basically two 3.7V Lithium cell in series, so no ripple. The voltage is a bit low, but it works just fine in my multimeter.Plz be aware that some 9V USB-C batteries use boost. You need to be careful when purchasing.

author: Andree Henkel
author_rank: Regular Contributor
timestamp: March 26, 2024, 12:53:42 pm
content: long term inacurracy: unlikely - as soon as you change back to origiginal supply any inaccuracy caused by ripple should vanishdamage: unlikelyhowever you can probably get measurement errors, the ripple can get converted to DC or AC measurement Errors in measurement electronics of the meterso basically is still not a good idea, at least if accuracy is of concern

author: SteveLTN
author_rank: Contributor
timestamp: March 26, 2024, 01:01:10 pm
content: Quote from: Andree Henkel on March 26, 2024, 12:53:42 pmI guess the linear regulators won't have ripple-removal circuit built-in then. Makes sense because they are designed to use normal batteries which are really clean source. Good to know!

author: tszaboo
author_rank: Super Contributor
timestamp: March 26, 2024, 01:25:46 pm
content: I've replaced my 9V batteries with lithium ones with DC-DC inside. They measure voltage.
Another MSO5102D bricked....! - Page 1
Forum section: electronics / testgear

author: zol
author_rank: Newbie
timestamp: March 24, 2024, 02:59:02 pm
content: Hello to all...!After a bad firmware upgrade , my MSO5102D is stuck at the beguinning start cycle : at switch ON appears the blue screen with strips of different colors ( as usual ) but suddenly turns black with some little dots at top and, after some seconds, start again with the blue screen ( in an eternal loop...).I have attached a serial-usb converter inside the circuit internal ( after some intense search info ) and I have the initial boot log (attached to this message) (I guess is well attached...)The serial number is : T 1G/012 009551The soft version is : 2.07.1 ( 130321.0 )The hard version is : 10070x555583e9Of course I don't have any backup of the original Filesystem...!!I guess some upgrade of a correct image or some important files are needed to turn the MSO to life....Any help is well received ....!...and thanks in advance too...!!!Zol
Looking for Atten AT6030DM spectrum analyzer software - Page 1
Forum section: electronics / testgear

author: R-1125F
author_rank: Regular Contributor
timestamp: March 23, 2024, 07:22:44 pm
content: I am looking for Atten AT6030DM spectrum analyzer software, either "SA_Comm_TC" or "SA_Comm_RS" or both. It does not seem to be available from Atten. Anybody got a copy of the disc for this unit?Were Atten branded spectrum analyzers made by a different manufuacturer?
AOPUTTRIVER Digital Insulation Tester - Page 1
Forum section: electronics / testgear

author: W3SLK
author_rank: Contributor
timestamp: March 23, 2024, 03:35:29 pm
content: I'm wondering if anyone has done a thorough analysis on one of these? I work with some RF that runs at ~2~3KV for B+, (yeah ok tubes!). I wanted something that would check the insulation status of some of the transformers that I have before hooking them up and ruining them. I would have preferred something at 10KV but I thought this was pretty good for the price. I tested it with my Fluke 85III and 6KV HV probe and can attest it gets to 5KV! I would like to hear some opinions especially if someone opened it up!Mod-U-Lator,Mike(y)/W3SLK

author: Tjuurko
author_rank: Regular Contributor
timestamp: March 25, 2024, 05:16:43 am
content: This device has many "manufacturers":HoldPeak HP-6688BMetroQ MTQ 9500INFURIDER YF-6688BAIOMEST AI-6688BSIGMA SG 5K20...
Transmille 8.5 digit multimeter, what about the inside, nice looking? - Page 1
Forum section: electronics / testgear

author: peranders
author_rank: Newbie
timestamp: March 23, 2024, 11:53:13 am
content: Transmille has been an unknown brand for me but does anyone has pictures how it looks inside. The outside is nice looking but how about the inside?https://www.transmille.com/product/8100-series-precision-multimeter

author: voltsandjolts
author_rank: Unknown
timestamp: March 23, 2024, 02:04:03 pm
content: Not 8100 series but 8081:https://www.eevblog.com/forum/testgear/8-5-digit-dmm/msg1294967/#msg1294967
Oscilloscope manuals - Page 1
Forum section: electronics / testgear

author: trapini
author_rank: Newbie
timestamp: March 23, 2024, 04:20:30 pm
content: I am new to this forum. I have come across several manuals that I would like to give away rather than tossing in the recycle bin.Tektronix 2213 Oscilloscope OperatorsTektronix 2213 Oscilloscope ServiceTektronix 422 Oscilloscope CompleteDigitec 3110 Precision Voltage/Current SourceTom tomrapini@gmail.com

author: tggzzz
author_rank: Super Contributor
timestamp: March 23, 2024, 06:39:09 pm
content: I suggest you remove your email address before it is harvested by scammers. Interested people can either reply in this thread or by PM.And thanks for not simply junking the manuals!If you sell stuff on fleaay, manuals sell for a modest amount.P.S. Please remove your double post before it annoys people!
Agilent E4446 Spectrum Analyzer doesn't power-on. - Page 1
Forum section: electronics / testgear

author: Lew
author_rank: Newbie
timestamp: December 09, 2020, 04:09:49 pm
content: I am trying to troubleshoot the A9 2nd LO /Fan control board in an E4446.This board sends the power-on enable signal to the power supply. The unit does not power up with this board inserted.I believe the OTP over temp protect circuit may be preventing this signal from being asserted, so the unit can not power-up.No schematics available.? If I could get an extender card then I can figure out and trace back the faulty circuit.Does anyone know what type or p/n of the connector???Does anyone know the power supply pin-out so I can trace backward from the power-on signal.??Also this card started causing this problem just after initialization screens and just before the final spectrum analyzer screen was to appear. I had another A9 card that I tried and it did the same thing. Now i have 2 bad A9 cards.So maybe something wrong on the motherboard or a shorted fan causes the problem and I am looking into that but i need to fix the A9 fan control problem without schematic. Need help.

author: sq6emm
author_rank: Newbie
timestamp: March 22, 2024, 09:44:51 pm
content: Hello Lew,have you succeeded finding schematic of A9?I have problem with 2nd LO unlock after power failure of the power supply... All works but 2nd LO unlock appears...Regards
HP/Agilent/Keysight 16440A and 16441A teardown  - Page 1
Forum section: electronics / testgear

author: DavidKo
author_rank: Frequent Contributor
timestamp: March 22, 2024, 09:08:01 pm
content: Some photos of SMU/Pulse generator selector and R-Box.What confuses me is that both PG channels have semiconductor relay, but only 1st channel is using it.If it helps someone also the connection of the connector (DB-15).
HP 334A distortion analyzer calibration issue - Page 1
Forum section: electronics / testgear

author: mpegjohn
author_rank: Newbie
timestamp: March 20, 2024, 11:19:52 am
content: Hi,I bought a nice looking HP-334A from a well known auction site.I had to replace the meter movement, as that was not working, so I bought another cheap unit for parts.I have replaced all the electrolytics on the PSU and A2 board.Calibration of the voltmeter was surprisingly easy, and it seems quite stable even on the 300uV range. Good enough for me anyhow.I then went on to the next stage in calibration, the sensitivity level calibration.On setting 5, I can set the meter to read 9mV at 400Hz fine. I then switch the oscillator to 100KHz and the meter bangs over on the end stop. Adjusting the little capacitor makes little or no difference. Changing the frequency to 1KHz, still the same, the meter bangs over hard past FSD. 400Hz it's fine.I put an oscilloscope on the output of the impedance convertor and changed ranges and frequency and it looks quite flat.Any help would be much appreciated. Where to look, what to test etc.Best regards,John

author: mpegjohn
author_rank: Newbie
timestamp: March 22, 2024, 07:18:01 pm
content: OK figured it out.Don't try the calibration with the high pass filter switched in. Duhh.So now I have a calibrated 334A.Just need to change the electrolytics on the last PCB now.John
UNI-T UT211B upper amp range not work - Page 1
Forum section: electronics / testgear

author: Romero77
author_rank: Newbie
timestamp: March 20, 2024, 01:50:57 pm
content: Hello, people!This is my first post on this beautiful forum. Hope to have a useful time here!On the problem.. I have UNI-T UT211B clamp meter. After a time, when I needed to measure amperage on 60A DC range I found out that meter don't show reading on display. On 60A AC too. Shows only zeroes.Only low range 6000/600 mA works.I don't see any problem on the board, when checked. Here she is:IMG_20221004_104725960.jpg(1158.65 kB. 2113x1189 - viewed 53 times.)The only thing that comes to my mind is corrupt EEPROM.I will be very, very happy if someone share his dump file of his UT221B!Have a programmer to do the job. Thank you in advance, people!

author: Romero77
author_rank: Newbie
timestamp: March 23, 2024, 09:33:38 am
content: In fact, after self-calibration, it turned out that the DC reads the current at 60A. Only at 60A AC range does not read and at NCV range does not make a sound when touching the power cable.I found these problems after Duracell battery leak. But it was a little drop on the back of the board.May be I'm missing something wrong on the board and thing is a EEPROM?
Racal 6111  - Page 1
Forum section: electronics / testgear

author: auato
author_rank: Contributor
timestamp: April 17, 2023, 12:25:39 pm
content: Hi, I would like to check the main functionalities of this instrument which is apparently working and also detectable and interfaceable by GPIB. No one document exists in the webit comes from a batch of industrial instruments being disposed of

author: coromonadalix
author_rank: Super Contributor
timestamp: April 17, 2023, 03:15:43 pm
content: youll have to dig on the web all you can find about thesesRacal 6111 / 6111E / 6115 GSM/DCS 1800 Bts Test Systemtry to find operating manuals, you may find some code snipet talking to them ............https://www.analyticalelectronics.in/testequipment/manuals/racal.htmlNothing shows up on the famous manuals websites, i dont think this puppy is useful loll take it appart

author: auato
author_rank: Contributor
timestamp: April 17, 2023, 04:28:20 pm
content: Quote from: coromonadalix on April 17, 2023, 03:15:43 pmThanks

author: Derek@Faro
author_rank: Newbie
timestamp: March 24, 2024, 01:05:29 pm
content: Did you find any information on the RACAL 6111?I used these back in the early '90s to commission GSM BTSs.

author: auato
author_rank: Contributor
timestamp: March 24, 2024, 08:58:02 pm
content: unfortunately nothing else
Pixeldefect on Siglent SDS814X HD - Page 1
Forum section: electronics / testgear

author: eTobey
author_rank: Super Contributor
timestamp: March 21, 2024, 10:48:22 am
content: I got a pixel defect. Anyone else had this?Is there a possibility, that there could develop more of these defects?

author: radiohomebrewer2000
author_rank: Contributor
timestamp: March 21, 2024, 10:59:47 am
content: Can you describe this pixel defect better?Also, can you provide a screen shot, photo, or video of this pixel defect?You can upload a video to YouTube. And then provide the link in your reply.

author: ebastler
author_rank: Super Contributor
timestamp: March 21, 2024, 11:35:37 am
content: I have not noticed anything -- but as radiohomebrewer said, a description and photo of the defect you found would be helpful so we know what to look out for. Is it an always-on or always-off pixel? Single pixel, or a group of adjacent ones?In the early days of TFT displays, specs on the number of permissible pixel defects were common. But I have not seen such specs for quite a while. Is that because I stopped paying attention, or because display manufacturing is generally so well-controlled now that defects are no longer expected?

author: eTobey
author_rank: Super Contributor
timestamp: March 21, 2024, 12:46:28 pm
content: I just noticed, that it is a bunch of pixelsIts all colors

author: ebastler
author_rank: Super Contributor
timestamp: March 21, 2024, 12:51:25 pm
content: Almost looks like it is not a "digital" defect, where some pixels do not operate -- but some "analog" piece of debris which obscures the pixels. Some pixels seem to be half-visible. But it's not on the outside of the screen, where it could be cleaned off, I assume?

author: eTobey
author_rank: Super Contributor
timestamp: March 21, 2024, 02:47:13 pm
content: I wanted to leave the protective screen on, but to make sure, i removed it. It looks like some kind of defect. Its barely visible, if you look from the side (80°).

author: ebastler
author_rank: Super Contributor
timestamp: March 21, 2024, 02:57:48 pm
content: If it is permanently stuck on or behind the coverglass, I would ask the dealer to replace the scope. This kind of defect is not "state of the art", and while it does not make the scope unusable, you can't un-see it now and will probably always be distracted by it.
[Solved] SDS814 Decrease length of pre-trigger. - Page 1
Forum section: electronics / testgear

author: eTobey
author_rank: Super Contributor
timestamp: March 22, 2024, 11:58:29 am
content: I could not find this setting, even in the manual.Does anyone know if this can be set up?I dont care at the moment what comes before the trigger, and when this buffer is not filled, it does not trigger! I lost quite a few trigger already (not bad, but annoying).

author: eTobey
author_rank: Super Contributor
timestamp: March 22, 2024, 12:47:02 pm
content: Found it!Utility -> Menü -> Systemsettings -> Referenz pos. -> set it to 10%Edit:Just moving the trace, will achieve the same thing.
RTB2004 I2C Trigger - Page 1
Forum section: electronics / testgear

author: Darkover
author_rank: Regular Contributor
timestamp: March 20, 2024, 11:12:47 am
content: I have an I2C on my RTB and like to trigger on the adress (0x50),but it also triggers when there is 0x50 data on the bus.Am I to stupid to find a solution or is the RTB crippled down comparedto the older and cheaper Hameg HMO scopes?Olaf

author: nctnico
author_rank: Super Contributor
timestamp: March 20, 2024, 11:36:02 am
content: Isn't there an option to trigger on an address specifically? Or I2C start condition + address?

author: Kean
author_rank: Unknown
timestamp: March 20, 2024, 11:45:36 am
content: Select the Address and Data option under I2C Trigger, and leave the data values as don't carehttps://www.rohde-schwarz.com/webhelp/RTB_HTML_UserManual_en/Content/de86ed8fb1bb44e5.htm#d803048e23212
Anritsu Sitemaster battery question - Page 1
Forum section: electronics / testgear

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: January 19, 2024, 11:47:25 pm
content: Does anyone know the pinout of the shown battery (5 contact surfaces) used in several portable Anritsu instruments?It is a 10.8V 2100mAh NiMH battery, which is supposedly also used in some camcorders (info from Antitsu technician).

author: metrologist
author_rank: Super Contributor
timestamp: March 19, 2024, 10:46:18 pm
content: Anritsu does not use Chinese batteries. A lot were National Power.CDT terminals Charge, Data, Temphttps://www.anritsu.com/en-us/components-accessories/products/633-27The shop site has been dead for a while, killed by gov security policies.