hybridfree/eevblog-posts huggingface dataset:
Free Decode, AWG and MSO options on Siglent SDS2000 series. - Page 1
Forum section: electronics / testgear

author: TrioTest
author_rank: Contributor
timestamp: September 21, 2015, 08:20:07 am
content: Moved to BUY/SELL/WANTED as suggested - However I can't delete the thread here?

author: Karel
author_rank: Super Contributor
timestamp: September 21, 2015, 09:53:16 am
content: Please move this to Buy/Sell/Wanted...
Fluke 8000a calibration issue - period adjustment - Page 1
Forum section: electronics / testgear

author: Rax
author_rank: Super Contributor
timestamp: September 16, 2015, 05:50:28 pm
content: Hi all,I've built a rig around the calibration procedure specified in the manual for the 8000a, and proceeded to calibrate it yesterday.The rig is comprised by a MAX6225ACPA+, a couple of resistive dividers based on PTF56 precision resistors (0.02% or 0.01%, as I could find them, ppm also 5 or 10) that output very close to, again, the specified points of adjustment: 185.2mV vs. 190mV and 1.865V vs. 1.900V. You can see I love this old DMM, judging by my investment in this rig.To cut a long story short, the adjustments went flawlessly (this is probably now better calibrated than my Fluke 189, though it doesn't win at consistency in time...), but there's one roadblock I'd appreciate help with, very much.I was unable to successfully execute the period adjustment step (4-25). I hooked up my Leader LDC822 set for time interval mode, but upon going full range left to right on R20, I cannot get it anywhere close to 100ns. My counter shows somewhere in between 143ns and 145ns by running that pot all the way end to end.I am not sure why that is. I also assume this would also only impact my ACV measurements - right? I'd love this to be fully calibrated, but if it's just that, I can live with it. I use my 189 for any ACV measurements, being true RMS.I also have an Instek GFG-8216A I could use as a counter, but I don't think it has time interval mode. And yet, I could just adjust for 10Hz in frequency counter mode as opposed to 100ns in time interval mode to the same effect, isn't it?Thanks a lot for your thoughts!

author: Analysator
author_rank: Newbie
timestamp: September 20, 2015, 09:53:28 pm
content: Hello Rax,what revision of the 8000A Instruction Manual do you refer to?RegardsMartin
TEK 475 Flickers - Page 1
Forum section: electronics / testgear

author: PsychoMaster
author_rank: Regular Contributor
timestamp: August 17, 2015, 09:54:31 am
content: Hello FolkWhen I first switch on my beloved Tektronics 475A on channel one the screen flickers about when you touch the vertical selector dial but settles down after ten minutes warm up so I have not messed with it .It obviously won't sort itself out so any advice would be welcome.

author: SaabFAN
author_rank: Frequent Contributor
timestamp: August 17, 2015, 10:16:34 am
content: Try to get some "Kontakt" Cleaner into the knob. It probably is just a little bit dirty inside.If that doesn't help, it might be necessary to replace the knob or repair it, because some parts are bent or out of alignment.

author: PaulAm
author_rank: Frequent Contributor
timestamp: August 17, 2015, 11:35:41 am
content: Do not use contact cleaner on the attenuator contacts. I'm assuming you meant the attenuator since the channel selector controls are push buttons.The contacts on the Tek cam switches are gold plated and should only be cleaned with a small piece of copier paper soaked in IPA. They do get dirty over the years. Cleaning them is a delicate but relatively easy task. The full procedure is in a thread somewhere.

author: SaabFAN
author_rank: Frequent Contributor
timestamp: August 17, 2015, 01:24:40 pm
content: Is that Kontakt-Cleaner (I have "Kontakt 60" here) bad for gold-plated contacts?What about Kontakt 200 Oil btw.

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: August 17, 2015, 04:21:38 pm
content: In that Front End circuit, anything you put in there that does not evaporate completely will change circuit impedances, and alter the characteristics of bandwidth etc. Do you really want to do that?

author: PsychoMaster
author_rank: Regular Contributor
timestamp: September 20, 2015, 09:14:46 pm
content: Hi AllThanks for the replies , I am so late as the caps went on my old motherboard and I am too tight to get a new one so a awkward repair was needed.I reckon on no more than a clean with alcohol and a good blow as a first attempt.
awg2020 users manuals/how to beat 2.5 MHz limit - Page 1
Forum section: electronics / testgear

author: sarepairman2
author_rank: Frequent Contributor
timestamp: September 20, 2015, 04:29:32 pm
content: I am a proud new owner of a working awg2020 function generator. the data sheet said this unit can do pretty fast sine waves and whatnot, but the function generator part of it locks it out at 2.5 MHz despite a 250MHz clock.Now I understand that there is a formula which depends on the # of bits in a DAC and the clock speed limiting the maximum waveform speed @ x number of bits, but the manual pretty clearly states that the unit is capable of doing much faster waveforms then 2.5MHz.How do I get this functionality at the expense of bits? Is it something that you need to actually program in on the floppy disk/GPIB?is there a ENOB menu or something like that?i know its happy when I turn it on because it plays me a little relay click songis there no way to just make the FG "menu" say "fuck it, go full speed idc about how it looks"
to program by font keys the HP 3458A for a rolling average (mean) - Page 1
Forum section: electronics / testgear

author: pelule
author_rank: Frequent Contributor
timestamp: September 20, 2015, 09:42:24 pm
content: Hope, there are some users of the 3458A out there, more experienced than me.I like to make rolling average (mean) measurements with my 3458A.Preferred to have a running average out of the last 8 or last 16 measures.The 3458A shall operate stand alone (no connection to a computer).Searched in the manual and the WWW (also in this blog), but could not find a solution.With my Datron 1281 this is a quite easy job:just select "AvR" in the "Math" menue and use the "Config" to set the "N" value to define the number of measurements to average.Any ideas?

author: DimitriP
author_rank: Super Contributor
timestamp: September 20, 2015, 11:28:36 pm
content: The only place I found about enabling Math operations is on page 118, and very deceivingly it seems , Math operations are enabled by sending a command via GPIB.Hopefully someone else will chime in to confirm or deny ....Anyone... Bueler....from the manual (http://literature.cdn.keysight.com/litweb/pdf/03458-90014.pdf)page 118Quote

author: pelule
author_rank: Frequent Contributor
timestamp: September 21, 2015, 08:52:32 pm
content: This fits to my findings so far.A tip from a friend:Use the user programming feature and define it to one of the user definable keys (as I did for the TEMP? command).But we did not find the solutiion for the rolling average, just the one time average (STATS, MEAN).My solution so far:set the NPLC to 10*N, according to the manual, in case NPLC is > 10, the tools does N x (NPLC=10 measures) and builds the average.-quote-if you specify 60=PLCs (1 second of integration time at a 60 Hz = line frequency) using the NPLC command, the mulitmeter averages six 10 PLC readings.-unquote-But this is still no rolling average unfortunately.

author: dacman
author_rank: Frequent Contributor
timestamp: September 22, 2015, 11:12:05 pm
content: The closest thing on the 3458A to a rolling average would be MATH FILTER. It is definitely not a rolling average. With NDIG 8 set, and others at default (NPLC 10 and DEGREES 20), I think it takes about 100 seconds to settle (with 60 Hz line power). If DEGREES were set to 10, it would take about 50 seconds. It's stated to act like a 1-pole RC low-pass filter.
Fluke 8842A getting rid of a small current offset (-30 uA) - Page 1
Forum section: electronics / testgear

author: SharpEars
author_rank: Unknown
timestamp: September 20, 2015, 02:45:51 am
content: Is it possible on the Fluke 8842A multimeter to get rid of a small current offset (say about 30 microamperes or so)? This appears when the unit is fully warmed up and in current measurement mode and there is nothing attached to it. I was looking through the manual and short of going through the entire calibration procedure for all functions, I see no way to get rid of a fairly small current offset (i.e., to zero out the reading when there is no current flowing through the instrument).If anyone has any thoughts or knows of a way to do this, please help me out.

author: TiN
author_rank: Super Contributor
timestamp: September 20, 2015, 03:09:58 am
content: Just use math REL function to null readout?

author: deadlylover
author_rank: Frequent Contributor
timestamp: September 20, 2015, 03:13:20 am
content: Does pressing the offset button work?

author: mtdoc
author_rank: Super Contributor
timestamp: September 20, 2015, 04:02:11 am
content: Yep, that's exactly what the OFFSET button does. See section 2-29 in the manual "Offset Measurements".

author: SharpEars
author_rank: Unknown
timestamp: September 20, 2015, 02:27:46 pm
content: Quote from: deadlylover on September 20, 2015, 03:13:20 amQuote from: mtdoc on September 20, 2015, 04:02:11 amI must have been blind, the Offset button did the trick! I guess I was looking for a Zero button and tried to search for zero/zeroing in the manual, as it is called on my other DVMs. Apparently, the word offset didn't click in my head as "compensating for an existing offset."
Cheap ir thermometer for transistor checking? - Page 1
Forum section: electronics / testgear

author: Solder_Junkie
author_rank: Frequent Contributor
timestamp: September 19, 2015, 08:46:43 am
content: Apologies if this has already been asked, but are the low cost ir thermometers much use to check for overheating transistors? As far as I can ascertain, they are prone to averaging the temperature within their "viewing" cone, and while OK to measure something fairly large, such as a large heatsink, they are probably too broad to be reliable to check individual transistors.I don't want to spend a huge amount, so am not looking for a thermal imaging camera. Would a Fluke 62, one of the many cheap Chinese units, be any use with through hole (TO92 and similar sized) transistors, or would it be money wasted?

author: Kleinstein
author_rank: Super Contributor
timestamp: September 19, 2015, 10:58:47 am
content: You named the problem: it's the viewing cone. So the important factor is the question how close you can get to the tip of the cone. The actual sensor is usually quite small, something like 2 mm diameter. How close you can get depends - some units use a sparate plastics lense and are this of no real use for anything smaller than TO3. Its actually those with a larger viewing angle where you have a better chance to get a really local reading.Some in ear thermometers could work, if they also work in a larger than the small medical range.

author: SeanB
author_rank: Super Contributor
timestamp: September 19, 2015, 12:31:28 pm
content: I bought the cheap in ear one ( $20) and it will do from -20C to 120C with reduced accuracy. Plenty good enough to see if a package is overheating, as no semiconductor package should be over 70C in any case for reliability. Over 100C it is being run way too close to cook.

author: Solder_Junkie
author_rank: Frequent Contributor
timestamp: September 20, 2015, 06:41:23 am
content: Thanks for the replies. I think I'll try one of the cheap Chinese ir thermometers from eBay that go to 500C or so. For less than 15 GBP they might be useful for other purposes if they struggle to measure small transistors up close.The Fluke 62 Max+ looks interesting, but I'm not sure if the laser pointers are much benefit at half an inch range, so I'll save my pennies.The ear thermometers I can find only specify limited temperature ranges and might not display outside "body temperatures", but thanks for the idea Sean.

author: SeanB
author_rank: Super Contributor
timestamp: September 20, 2015, 08:01:42 am
content: The cheap in ear ones use the same bolometer as the cheap IR ones, just that during manufacture of the bolometers they test them all, and those with good accuracy at 30-40C are marked as the in ear ones, the rest are graded into looser selections and the ones that are still functional but really poor go into the cheap IR guns. The more expensive IR sensors are used in the expensive units, where they actually come with a cal certificate and with a compensation table for the sensor built in.
Camera option for AmScope binocular scope - Page 1
Forum section: electronics / testgear

author: motocoder
author_rank: Unknown
timestamp: September 20, 2015, 10:35:00 am
content: I have an Amscope SM-3TY-54S-10M that I bought a few years back off of eBay. I absolutely love the scope.The scope came with a camera, and although the scope optics themselves are really good, the camera is total junk. The images are almost unusable. I started browsing the various cameras available for these units, and the number of choices is overwhelming. Does anyone have any experience with this and could perhaps recommend some options? I am open to creative solutions such as attaching a DSLR (although I'd have to buy that, so it would need to be a cheap DSLR).Thanks
DS1054Z firmware 04.03.01.05 - Page 1
Forum section: electronics / testgear

author: Fungus
author_rank: Super Contributor
timestamp: September 19, 2015, 03:53:39 pm
content: I just noticed the DS1054Z firmware on the Rigol web site is version 04.03.01.05, even though the Rigol web page says "04.02.04.07"http://beyondmeasure.rigoltech.com/acton/fs/blocks/showLandingPage/a/1579/p/p-0019/t/page/fm/0(Download the file and unzip it, it's 04.03.01 inside...)Anybody know the difference between this and 04.02.04.07?

author: MarkF
author_rank: Super Contributor
timestamp: September 19, 2015, 04:15:48 pm
content: The name, "04.02.04.07", is just an old version of the firmware. Since then, Rigol has just been updating the contents of the zip file without changing the zip filename. If you haven't already, just extract the "04.03.01.05" version and install it.Hereare the release notes with the changes.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: September 19, 2015, 05:05:22 pm
content: This latest version 04.03.01.05 identifies itself as "00.04.03.SP1" in Utility>System>System Info.However, you will get more information about the software/firmware your scope is running, if you print a "Param" .txt file from the Storage menu. What we are calling "firmware" here is what Rigol calls "SoftWare" in the Param listing... and what Rigol calls "Firmware" refers to some other bit of the scope's operating system.For example, here is the first section of a Param listing from my scope (serial number redacted):Code:Model:DS1xxxZSN:DS1ZA170xxxxxxManufacturer:RIGOL TECHNOLOGIESBoard Ver:0.1.1Firmware Ver:0.2.3.11BOOT Ver:0.0.1.2CPLD Ver:1.1SoftWare Ver:00.04.03.SP1As far as I am aware, only the "SoftWare Ver" changes when a new .gel file (what we have been calling "firmware") is installed.

author: Fungus
author_rank: Super Contributor
timestamp: September 19, 2015, 05:11:33 pm
content: Quote from: MarkF on September 19, 2015, 04:15:48 pmOK, thanks. I was still running the original firmware, I decided it was time to upgrade and found that weirdness.I assume it doesn't prevent the hacks from working - there would have been ahugedisturbance in the force andat least100,000 voices crying out in pain if it did.

author: Fungus
author_rank: Super Contributor
timestamp: September 19, 2015, 05:20:00 pm
content: Quote from: alsetalokin4017 on September 19, 2015, 05:05:22 pmMine is now the the same except for "BOOT" - I have version 0.0.1.1
need help for my new Rigol DP832 power supply - Page 1
Forum section: electronics / testgear

author: skstaff888
author_rank: Newbie
timestamp: September 18, 2015, 06:30:20 pm
content: Hello friends,I just purchased a new DP832 this week, with a little bit dispointment.The channel 1 always shows a current consumption even there is no load connected.But channel 2 and 3 are ok.Is there something wrong within the Ch1 's circuit?Thanks.

author: lho
author_rank: Newbie
timestamp: September 18, 2015, 07:14:44 pm
content: Hello skstaff888,You need to perform a calibration, mine have the same symptom on channel 1, after doing the calibration procedure every thing work's fine.Bye,Laurent

author: skstaff888
author_rank: Newbie
timestamp: September 18, 2015, 07:29:08 pm
content: Thanks. :)Laurent.Is it difficult to perform the calib.procedure?I am just a newbie in electronics.

author: PTR_1275
author_rank: Frequent Contributor
timestamp: September 19, 2015, 06:50:49 am
content: It isn't too difficult to do, I found the manual here on the eevblog site. I'm on my phone at the moment so can't help too much with finding and linking manuals.What sort of equipment of you have in the way of bench multimeters or handheld multi meters?I find that every month or so one channel will creep upto 1mA or so, so I just current calibrate that channel and all is good until next time. It's dissapointing that it needs to be done, but where my unit is gets a lot of temperature variance, so I put it down to that.

author: mcinque
author_rank: Unknown
timestamp: September 19, 2015, 08:25:13 am
content: Before attempting to do a recalibration, which is a PITA procedure without the proper scripted harwdare, what firmware do you have installed?

author: skstaff888
author_rank: Newbie
timestamp: September 19, 2015, 03:42:49 pm
content: Oh no.I just have a cheap 4-digit hand held DMM(+-0.1%).I give up the re-cal. procedure at the moment.

author: mcinque
author_rank: Unknown
timestamp: September 19, 2015, 05:19:53 pm
content: what-firmware-do-you-have?

author: skstaff888
author_rank: Newbie
timestamp: September 19, 2015, 06:53:07 pm
content: Firmware01.13 ,Bootloader01.09.
Does the bandwidth limiter work on a hacked Rigol DS2072A? - Page 1
Forum section: electronics / testgear

author: nbritton
author_rank: Frequent Contributor
timestamp: September 19, 2015, 02:42:08 am
content: Does the 100 MHz bandwidth limiter work on a DS2072A that has been unlocked to 200 or 300 MHz?

author: tautech
author_rank: Super Contributor
timestamp: September 19, 2015, 02:55:45 am
content: Quote from: nbritton on September 19, 2015, 02:42:08 amWhat makes you suspect it wouldn't?An even higher BW DSO might also have additional BW limit options.

author: nbritton
author_rank: Frequent Contributor
timestamp: September 19, 2015, 03:03:57 am
content: Quote from: tautech on September 19, 2015, 02:55:45 amBecause the DS2072A leaves the factory as a 70 MHz scope.

author: poida_pie
author_rank: Regular Contributor
timestamp: September 19, 2015, 03:06:50 am
content: on my hacked to 200MHz DS2072 (not A) with the trigger out fed into ch1 with 50 ohm termination I getno BW - 1.52ns rise time100MHz BW limit - 3.2ns20 MHz BW limit - 16.2nsSo I can say the BW limit works for me.

author: tautech
author_rank: Super Contributor
timestamp: September 19, 2015, 03:08:24 am
content: Quote from: nbritton on September 19, 2015, 03:03:57 amAnd why wouldn't it have the industry standard 20 MHz BW limit?

author: tautech
author_rank: Super Contributor
timestamp: September 19, 2015, 03:14:51 am
content: Quote from: poida_pie on September 19, 2015, 03:06:50 amSounds right.

author: dadler
author_rank: Unknown
timestamp: September 19, 2015, 03:57:53 am
content: "Hacked" is no different from unlocked-with-purchased-code in this context. The scope doesn't know it is "hacked". A code is simply entered, and the scope enables the options just as if they had been purchased.And the BW limit works properly on my DS2072A.
Suin Instruments, Hebei, China - Page 1
Forum section: electronics / testgear

author: Hydrawerk
author_rank: Super Contributor
timestamp: September 18, 2015, 03:35:54 pm
content: Have you ever seen Suin Instruments?http://www.suintest.comThey were presented at a trade fair. Some of their products are sold by PeakTech Germany.http://www.peaktech.de/

author: Hydrawerk
author_rank: Super Contributor
timestamp: September 18, 2015, 03:43:29 pm
content: The Suin SS7400 frequency counter is very similar to HP 53132A introduced in 1994 or before.Well, Keysight can be happy that their 20 years old design is still imitated by Chinese engineers. It is a tribute to Hewlett Packard.http://www.keysight.com/en/pd-1000001386%3Aepsg%3Apro-pn-53132A/universal-frequency-counter-12-digits-s?cc=CZ&lc=engQuote

author: Wytnucls
author_rank: Super Contributor
timestamp: September 18, 2015, 04:25:21 pm
content: Interesting. Any price list?

author: Hydrawerk
author_rank: Super Contributor
timestamp: September 18, 2015, 04:50:41 pm
content: Some stuff is sold as PeakTech...https://www.reichelt.de/Funktionsgenerator-Frequenzzaehler/PEAKTECH-4065/3/index.html?ACTION=3&GROUPID=4025&ARTICLE=122967&OFFSET=16&Quote
Tenma 72-5000 multifunction counter - Page 1
Forum section: electronics / testgear

author: Radio Tech
author_rank: Frequent Contributor
timestamp: September 18, 2015, 10:18:27 am
content: I picked up a Tenma 72-5000 counter for free this week.Looks really good and test ok.Unfortunatly I cannot find much information on the model of the counter. Does anyone know if this was a re-badged unit? Maybe something under a different name?I will post some pics of the inside later on.Thanks

author: Shock
author_rank: Super Contributor
timestamp: September 18, 2015, 11:43:50 am
content: Not 100% sure but at a good guess GW Instek (Good Will Instrument) Taiwan, just because of the age.Tenma is also rebranding a lot of Atten as well as Uni-T. BK Precision does it as well but I think some of their older stuff is actually theirs. They look like a Tektronix CMC250 or CMC251 which was likely made by Escort (Escort Instruments Corporation) again Taiwan, who was brought up by Agilent in 2008.

author: Radio Tech
author_rank: Frequent Contributor
timestamp: September 18, 2015, 12:13:32 pm
content: Thanks Shock.I will look that up tonight when I get home.The counter works ok but man it is a mess inside. Main power switch is front panel mounted on the right. Mains enter the reaft at the left. Mains wiring just suspended in air running across the top of the board. Scary lol.thanks again.

author: Radio Tech
author_rank: Frequent Contributor
timestamp: September 18, 2015, 01:16:08 pm
content: After a little searching I found Tektronix CMC251 1.3GHz Freq Counter is identical to the Tenma.Thanks for the help.
Fluke 335D DC voltage voltmeter - Page 1
Forum section: electronics / testgear

author: sdk.61
author_rank: Contributor
timestamp: September 18, 2015, 01:02:01 pm
content: Hi,I hava a FLUKE 335D DC voltmeter. The divice was not working. The rezistance (R8) was broke down on high voltage mainboard. I fix it, voltmeter is working now, output signal is 1,2 V (DC), But I need to see ~1000V. I check all input signals. I need help.Thanks
I've got $500 'laying' around - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: September 15, 2015, 02:30:12 pm
content: deleted

author: artag
author_rank: Super Contributor
timestamp: September 15, 2015, 02:53:25 pm
content: Almost in the price range... I'd really like to try one of these :https://www.eevblog.com/forum/blog/eevblog-296-aim-tti-i-prober-520-current-probe-review/Or maybe a thermal camera ?I'm assuming you already have the equipment you *need*, you're just looking for shiny and interesting.

author: free_electron
author_rank: Super Contributor
timestamp: September 15, 2015, 05:24:03 pm
content: two palmtrees, a hammock and a fully stocked fridge.oh and a glass with a little umbrella in it...

author: free_electron
author_rank: Super Contributor
timestamp: September 15, 2015, 05:54:25 pm
content: good, means you can buy a bigger refrigerator.

author: ivan747
author_rank: Super Contributor
timestamp: September 15, 2015, 06:19:49 pm
content: Quote from: free_electron on September 15, 2015, 05:54:25 pmI like this guy

author: Deathwish
author_rank: Unknown
timestamp: September 15, 2015, 06:22:38 pm
content: Can I interest you in buying London Bridge ?. It's about the same price...

author: Deathwish
author_rank: Unknown
timestamp: September 15, 2015, 07:06:33 pm
content: Quote from: McCarthy on September 15, 2015, 07:05:08 pmI'm sure you can transport it home

author: ivan747
author_rank: Super Contributor
timestamp: September 17, 2015, 04:03:24 pm
content: What do you already have?
DC Bench / Rackmount Power Supply Suggestions - Page 1
Forum section: electronics / testgear

author: gyrfalcon16
author_rank: Contributor
timestamp: September 12, 2015, 04:37:13 am
content: Hello. I was looking to buy a DC power supply that I could use to power laptops, and other miscellaneous DC powered items I run across. Unfortunately I'm not up to speed on the latest, greatest, or best buys in electronic equipment.I really don't care how new or old it is. If it has digital or analog controls...rackmount, benchmount, etc. I think 48V is about the top end of what I'd use, and maybe 10 amps?TheKeithley 2260B-80-27 Bench Power Supplylooks really nice but is super pricey.Ebay has a 60V 5amp that's kinda low on the amperage, but it's cheap...I'm open to advice, even if it's that I should have posted this in the beginners forum.

author: gyrfalcon16
author_rank: Contributor
timestamp: September 18, 2015, 01:38:16 am
content: No opinions, recommendations or options? I've thought about building one, perhaps out of a salvaged PC power supply but they're not really designed for variable voltage.

author: bitseeker
author_rank: Super Contributor
timestamp: September 18, 2015, 06:38:19 am
content: You might want to keep your eyes open for the HP/Agilent E3000-series (don't remember which model fits your V/A requirements, but some go to as much as 20A). Of course, if you're willing to fix it, you can get "for parts/repair" units cheaper that "tested" ones.Lots of us like the aesthetics of the Power Designs supplies. The bench models go up to as much as 60V, but top out at around 5A (e.g., PD6050).Of course, some supplies support two or more devices hooked up in serial or parallel operation with one acting as the master. So you could opt for that to get more voltage or more current (and more flexibility as a result).
How do i test a ic that produces a square wave with a scope? - Page 1
Forum section: electronics / testgear

author: Jesset1996.5
author_rank: Regular Contributor
timestamp: September 17, 2015, 12:31:52 am
content: Hello everyone! I currently have an ic that goes in my powe supply that needs to be tested. It produces an square wave and i know i can measure it with a scope but im not quite sure how.i have looked on the Internet but all that pops up is using a signal generator which is useless info since what i am testing is if the ic produces a square wave or not. The square wave is fed into a transistor to boost the voltage from 12v ac to 45v ac to charge some caps that rase it to 110v ac. The transistor self destructed itself and i think it may have been due to ether something wrong with the ic or even just its age. How exactly would i set up this kind of test up? I am new to using scopes so any help would be great!

author: JoeB83
author_rank: Regular Contributor
timestamp: September 17, 2015, 01:37:35 am
content: What is the IC? Find the datasheet, look for the output pin, and connect your probe to the output pin.

author: JoeB83
author_rank: Regular Contributor
timestamp: September 17, 2015, 06:58:21 am
content: Quote from: DimitriP on September 17, 2015, 02:52:23 amYou should be set!

author: tggzzz
author_rank: Super Contributor
timestamp: September 17, 2015, 07:11:02 am
content: Quote from: DimitriP on September 17, 2015, 02:52:23 amAnd with that probing technique you are likely to see edges like this (or worse)https://entertaininghacks.files.wordpress.com/2015/03/hp10074-falling-6inch.gifwhen the waveform is actually like thishttps://entertaininghacks.files.wordpress.com/2015/03/hp10074-falling-bayonet.gif

author: Jesset1996.5
author_rank: Regular Contributor
timestamp: September 17, 2015, 10:24:17 am
content: Quote from: DimitriP on September 17, 2015, 02:52:23 amthe ic is a cn587t. I cant seem to find a data sheet or even a ic i can use to substitute the ic with if it doesn't work.
Hong-Kong Electronics shops? - Page 1
Forum section: electronics / testgear

author: acbern
author_rank: Frequent Contributor
timestamp: September 16, 2015, 08:25:18 pm
content: I am planning to go to Hong-Kong in October. Does anybody have any recommendations where to buy electronics surplus parts or surplus test equipment. Looking for some kind of an outlet, rather than a normal shop (so not a Digikey-like shop with Digikey-like standard prices; I can as well order there online).Thanks

author: retiredcaps
author_rank: Super Contributor
timestamp: September 16, 2015, 08:39:16 pm
content: PM Franky Tong here. I'm sure he can tell you.

author: trevwhite
author_rank: Frequent Contributor
timestamp: September 16, 2015, 09:45:18 pm
content: Get a visa for China and catch the train to Shenzhen. It is maybe an hour and really cheap to travel there. You can stay in a hotel for a night or two and enjoy the electronics markets there. Check out dangerousprototypes.com for more information as Ian who runs that site lives there and is really welcoming of people. That is going to be a lot more fun than HK for electronics stuffTrev

author: Maxlor
author_rank: Frequent Contributor
timestamp: September 16, 2015, 11:14:38 pm
content: Apliu street market is worth a visit if your into electronics. There's a bit of everything there, from shops selling (new) test gear, to LED grab bins. It took me about 3 hours to casually go through everything they have on offer there. If you're looking for a huge selection or rare stuff, you'll probably have to hit Shenzen.

author: acbern
author_rank: Frequent Contributor
timestamp: September 17, 2015, 06:09:03 am
content: Thanks so far, have been at Apliu, found some nice Oscons there, but that was about it. Want to avoid Shenzen, since my stay in HK is pretty short anyway. I had hoped that there is something similar to the Shezen shops also in HK, will also ask FT.
Question about Logic Analyser Pod Cables. - Page 1
Forum section: electronics / testgear

author: McBryce
author_rank: Super Contributor
timestamp: September 15, 2015, 01:09:51 pm
content: Hi all,I have a Rigol MSO11104z-s (with LA), but the flat cable to the digital test points is about 10cm shorter that I need it to be. I also have an old pod cable from a different Logic Analyser that would be long enough and the connector seems correct too. My question is: Are these interchangeable? Are they just glorified extension cables or do they contain active components matched to the device which would mean I can only use it on the device it was made for?McBryce.

author: Kintekobo
author_rank: Regular Contributor
timestamp: September 15, 2015, 04:22:17 pm
content: I originally thought that they were just ordinary twisted pair cables but when I tried to do a continuity check on the cables on my Agilent I couldn't trace anything other than the ground leads which were all along one side. None of the other connectors showed any continuity so I have to assume some active components in the head. Most likely Rigol do the same as they used to make for Agilent at one time I think.

author: free_electron
author_rank: Super Contributor
timestamp: September 15, 2015, 04:33:31 pm
content: the agilent cables have resistive dividers in em.
Advantest Spectrum Analysus R3267 - Page 1
Forum section: electronics / testgear

author: marcor
author_rank: Newbie
timestamp: September 14, 2015, 04:19:24 pm
content: Hello all,I've got an Advantest R3267 spectrum analyser and it's giving the INSERT SYSTEM DISK upon powering on. Presumably the application software is missing/corrupted. Is there anyone who has the software?Any information from anyone owning an R3267?RegardsMario
Create pass/fail from recorded data - Rigol DS2072A - Page 1
Forum section: electronics / testgear

author: MattFL
author_rank: Contributor
timestamp: September 14, 2015, 01:44:59 am
content: On the Rigol DS2072A, is it possible to create a pass/fail mask from recorded data and compare it to other recorded data? I've got pass/fail working great with live data, but I need ti do it entirely with recorded data, and so far I'm not having any luck figuring out how. When I'm playing back recorded frames, the pass/fail option is disabled.
Agilent replacement parts - Page 1
Forum section: electronics / testgear

author: hugo
author_rank: Regular Contributor
timestamp: September 13, 2015, 01:41:10 pm
content: Hey guys,I need a replacement cover for the rear fuse holder for a U8002A power supply and a display cover for a U1272A multimeter.Does anyone know the parts number, cost, is there a similar part from digikey or mouser (fuse holder) ?I'm located in Toronto, Canada.Thanks

author: HighVoltage
author_rank: Super Contributor
timestamp: September 13, 2015, 11:04:51 pm
content: You can look up available Agilent / Keysight replacement parts here:http://www.keysight.com/my/faces/fapHomePage.jspx?_afrLoop=96770276534000&_afrWindowMode=0&_afrWindowId=null#%40%3F_afrWindowId%3Dnull%26_afrLoop%3D96770276534000%26_afrWindowMode%3D0%26_adf.ctrl-state%3Dvdeaafn0_13
Fuke Process Meter - Page 1
Forum section: electronics / testgear

author: reallybigone916
author_rank: Contributor
timestamp: September 12, 2015, 04:08:52 am
content: I'm in the market of getting a Fluke process meter.Any recommendation, pros and cons ?Main usage: verification and diagnostic between transmitter and PLC.Model that I'm looking at:773789787Thanks,

author: Smith
author_rank: Frequent Contributor
timestamp: September 12, 2015, 08:50:32 am
content: I regularly use a Fluke 726 process calibrator. It's accuracy is good, but the device has mayor drawbacks. It only works a few hours on 4 AA batteries. No external adapter possible. We do have a Fluke battery extension (officially for handheld multi meters, not for this calibrator, but it fits) which holds 4 C cell batteries, so we can use it for over 20 hours.The in/outputs won't accept standard spaced terminals like BNC to banana converters. Really annoying, this makes connecting a BNC a hassle with multiple converters. It's not that simple to connect, I've seen multiple users make wrong connections. It's ground is NOT it's current output return. Quite a simple mistake to make. It also doesn't connect standard thermocouple connectors, only the smaller types (don't know it's exact name).The interface is not handy. It does have some handy features like creating default steps (for simulation with default values).It boots in about 5 seconds, which is not to bad.

author: KGB
author_rank: Contributor
timestamp: September 12, 2015, 09:45:58 am
content: The 787 and 789 are true RMS DMMs (with limited current measurement capability) and loop calibrators in one. I have a 789, it has 4000 counts in auto range mode, but 6000 counts in voltage and manual range. The display is huge, but the backlight is annoying swamp-green. It has Touch Hold. And so, what we expect of a Fluke (but the bar graph is lacking).Oh, and which is worth considering, the battery life, catalog datas:789: 140 hours typical (measurement), 10 hours typical (sourcing 12 mA), 4 AA.787: 50 hours typical (measurement), 12 hours typical (sourcing 12 mA), 9V.773: 12 hours @ 12 mA sourced into 500 ?, 4 AA.The 773 is a very special tool with which we can measure current without removing a wire and breaking the loop (but up to 100 mA) and a "standard" loop calibrator, but not more. The price / performance ratio is the worst - I think.Cheers.

author: reallybigone916
author_rank: Contributor
timestamp: September 13, 2015, 05:17:20 am
content: Thanks Guys.The 773 seems very attractive (the clamp on function ) to me. My only concern is the "standard" loop calibrator vs. the more advance loop calibrators from 787 or 789.
HP 1661C LA floppy drive issues - Page 1
Forum section: electronics / testgear

author: poot36
author_rank: Frequent Contributor
timestamp: September 12, 2015, 11:09:04 pm
content: I am having occasional trouble with the floppy drive saying that the disk is write protected when it is not. I have even had the error halfway through writing to the disk! It will go away if i eject and reinsert the floppy disk. Got any ideas on how to fix this? Can I just replace it with a standard floppy drive?
Looking for advice about a Fluke 97 scopemeter - Page 1
Forum section: electronics / testgear

author: Ca_s12
author_rank: Contributor
timestamp: September 13, 2015, 12:34:08 am
content: I found a fluke 97 scopemeter locally with no charger or probes for 130 dollars us. It powers on and seems to function. It is worth the cost?Thanks,Jon

author: marshallh
author_rank: Unknown
timestamp: September 13, 2015, 01:08:28 am
content: Yes

author: Fraser
author_rank: Super Contributor
timestamp: September 13, 2015, 03:00:03 am
content: I own one of them and the good news is the probes are BNC so generic probes will fit. I suggest you buy probes with the insulated BNC plugs as per original figment.Genuine FLUKE scope probes are very expensive. The multimeter probes are standard FLUKE meter leads.The 97 will run on nicads or alkaline batteries. Nicads need a connection between one positive tip and a charging tab at the bottom of the battery bay.Charger is nothing fancy but it does have a power plug with a long reach which can present a challenge. The power pack for charging will also power the 97 in a bench deployment scenario.Is it worth $130? ...... Test it with 4 alkaline c cells and if the screen and inputs are OK it's worth buying. You need a screwdriver to open the battery bay at the rear.Aurora

author: Psi
author_rank: Super Contributor
timestamp: September 13, 2015, 03:16:39 am
content: even if one channel was dead, that is still a good price for a good brand portable scope

author: Ca_s12
author_rank: Contributor
timestamp: September 13, 2015, 05:41:48 pm
content: Thanks all!
Why do waveform generators and PSUs make clicking sounds when adjusting voltage? - Page 1
Forum section: electronics / testgear

author: Rene
author_rank: Regular Contributor
timestamp: September 12, 2015, 05:04:37 pm
content: Basically, I have a waveform generator and a power supply that make clicking sounds when I go above or below a certain voltage value. Not all instruments do that, for example, the Rigol DP832 will not make a clicking noise regardless of the voltage value I select.Why do some instruments make a clicking noise and some others don’t? Are the ones that make clicking noises of inferior quality?I tried searching he web for some answers but I failed miserable.Thanks.

author: rob77
author_rank: Super Contributor
timestamp: September 12, 2015, 05:29:57 pm
content: the clicking noise is coming from relays - in PSU it's changing taps on transformer to minimize the power loss (heat dissipated on the pass element) and the waveform gens are usually changing attenuation levels with relays.

author: dom0
author_rank: Super Contributor
timestamp: September 12, 2015, 05:49:25 pm
content: Some power supplies use relays to switch between different transformer taps to minimize power dissipation in their output stage (the output transistors and heat sink wouldn't be able to survive it otherwise in these designs). A rather crude approach in my opinion.Many signal generators use electromechanical attenuators (at lower frequencies just some resistors and relays), as do scope input amplifiers. Some don't, though.
HELP: Rohde Schwarz ESH3 repair - Page 1
Forum section: electronics / testgear

author: dthung
author_rank: Newbie
timestamp: September 12, 2015, 01:40:22 pm
content: Hello, I am an absolute beginner of R/S test gears. Recently I bought a R/S test receiver ESH3 for very low price as it is listed as Parts/Not working and it is. The problem is the ESH3 simply freezes after it turns on and it doesn't response to any input. I opened it up for some initial checking. It seems all the boards are there and no missing part based on my basic understanding of the operation of this ESH3. I also resit all the boards and look for any loose connection. There is few loose connection and I tightened them. Still it is not working.I haven't checked the status of the battery of it yet but according to what I read so far of the operation manual. The battery simply is used for remembering the previous operating setting of the instrument and it should not affect the basic function of it.Does anyone work with R/S ESH3 before or own one as I think it is quite popular within Ham community? Any suggestion for trouble shooting it and any repair tips? In addition, does anyone have the service manual of it? Any tip and advice of repairing this instrument is highly appreciated. Attached is a photo of the display of it after I turn on the power.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: September 12, 2015, 04:18:42 pm
content: II haven't seen an ESH3 in a very long time but the first thing I'd check are the connectors, which after all these years could well have accumulated some surface corrosion. Often it's enough to remove the boards and plug it back in a few times.Also, check for leaking capacitors.I haven't seen a Service Manual for the ESH3 in the wild, but you could ask R&S (the company is called 'Rohde & Schwarz' as in 'Rohde and Schwarz', or short 'R&S' and not 'Rohde Schwarz' or 'R/S', just saying!) if they send you the manual as they're generally very friendly towards hobbyists using old R&S gear. That means if they still have it.
-hp- 3478A DMM battery question - Page 1
Forum section: electronics / testgear

author: TimFox
author_rank: Super Contributor
timestamp: September 11, 2015, 07:46:37 pm
content: I recently obtained an -hp- 3478A digital multimeter and its service manual from separate eBay vendors. The DMM is in good working order and calibration.Reading the manual, I found that it uses a 3.0 V battery (BT701) to back up the calibration memory and as part of the turn-on circuitry. It has an -hp- house number: 1420-0278. In the schematic, there seems to be no charging circuit for this battery, but the load current should be minimal. I have not found any information in the manual about the expected lifetime for this battery, or how to replace it.Does anybody have information or experience on these questions?

author: SkyMaster
author_rank: Frequent Contributor
timestamp: September 11, 2015, 11:09:31 pm
content: Quote from: TimFox on September 11, 2015, 07:46:37 pmCongratulation for your new acquisition.ModemHead describes in details the steps involve to replace the 3.0V lithium battery, of a HP 3468A, on his website:http://mrmodemhead.com/blog/hp-3468a-battery-replacement/

author: radhaz
author_rank: Regular Contributor
timestamp: September 11, 2015, 11:12:07 pm
content: I have performed this battery replacement myself, using a butane soldering iron.

author: bingo600
author_rank: Super Contributor
timestamp: September 12, 2015, 06:48:53 am
content: I did it herehttps://www.eevblog.com/forum/beginners/changing-battery-in-a-hp-3478a-can-i-use-a-3v-lithium/msg205742/#msg205742/Bingo
Rear fuse cover for Agilent 34401A - Page 1
Forum section: electronics / testgear

author: bson
author_rank: Unknown
timestamp: June 24, 2015, 07:37:36 pm
content: Been trying to order a fuse cover from Keysight, but they're absolutely impossible to deal with.I can't be the first to need a replacement cover for the rear 3A fuse holder for a 34401A... Anyone know off-hand if there is a part from digikey or mouser that will fit?

author: radioFlash
author_rank: Regular Contributor
timestamp: June 25, 2015, 01:11:47 am
content: 0031.3551 Schurter Fuse Holder

author: bson
author_rank: Unknown
timestamp: June 25, 2015, 03:57:09 am
content: Excellent!!! Thank you!!!Update: got the part from Mouser along with a handful of 250V fast-blow 20x5.2mm 3A ceramic-cartridge fuses, and it works perfectly.

author: siggi
author_rank: Regular Contributor
timestamp: September 11, 2015, 10:12:11 pm
content: Thanks. 0031.3551 was out of stock at Digikey, but 0031.3558 has the same cap, and fits just fine.Sent from my iPad using Tapatalk
Repair of a Tektronix DPO4034 with faulty main board - Page 1
Forum section: electronics / testgear

author: elektronchika
author_rank: Contributor
timestamp: September 17, 2015, 10:00:13 am
content: Hello everyone,I'm an electronics engineer, and I like to also do some staff at home. I'm offered to buy a Tektronix DPO4034 with faulty main board. The scope starts but cannot boot and reports a bus failure with one of the acquisition chips. The current owner says this is a main board problem. I wonder if someone else had a similar problem, how he solved it? Or what do you think about repairing this scope at home? I ask all you guys, before buying the scope for advise.Best regards,Lazar

author: nctnico
author_rank: Super Contributor
timestamp: September 17, 2015, 10:07:09 am
content: If you can get it for free go for it, otherwise just buy a Rigol 1000Z series.

author: TiN
author_rank: Super Contributor
timestamp: September 17, 2015, 10:08:31 am
content: Depends on price

author: elektronchika
author_rank: Contributor
timestamp: September 17, 2015, 10:09:16 am
content: It's not for free, it's still expensive - more than 3000 Euro. But I can try to reduce the price, once I think it's wordy.

author: TiN
author_rank: Super Contributor
timestamp: September 17, 2015, 10:12:07 am
content: Then it's worthless.

author: nctnico
author_rank: Super Contributor
timestamp: September 17, 2015, 10:16:53 am
content: I agree. With such a fault I wouldn't spend more than 200 euro on it just for the fun and learning (I have a lot of experience with hacking/repairing test gear).

author: Orange
author_rank: Frequent Contributor
timestamp: September 17, 2015, 10:45:23 am
content: The chances that you can repair it are pretty slim. Tek uses always custom chips and hybrids. Usually unobtainable stuff, unless you have a donor scope.3000 euros for a defect Tek is absurd, even 200 euros is too much to take the risk.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: September 17, 2015, 11:25:59 am
content: Quote from: elektronchika on September 17, 2015, 10:09:16 amI agree with the others, €3000 for a defective 300MHz DPO4k are pretty much excessive. There aren't many user-serviceable parts inside, so you'd probably have to send it to Tek for repair, which will be expensive.I'd give it a shot if you can get it for €500 or less and send it for Tek for estimate/repair, and then the overall investment may be worth the effort. If it's more than €500 then better buy something else.

author: lowimpedance
author_rank: Super Contributor
timestamp: September 17, 2015, 11:49:35 am
content: A number of years back work had a DPO4k fail and that cost $5000 to fix,(cost $15K new), and all Tek did was change the main board and calibrate.If it fails again it goes into the bin. Frankly if you have the cash to spend buy something new and don't touch this landfill.