hybridfree/eevblog-posts huggingface dataset:
Broke fan collet for 2465 scope - Page 1
Forum section: electronics / testgear

author: LootMaster
author_rank: Regular Contributor
timestamp: December 05, 2020, 06:40:44 am
content: Can anybody print me this or make this for me ?PM me cost.https://cdn.hackaday.io/files/1638907011869760/2445-2465%20Fan%20Collet.jpgI recapped the electrolytics, re-assembled all, saw that it worked.Only to find that this stupid fan would not fit anymore due to it being broken nd apparently its needed.

author: Gertjan
author_rank: Frequent Contributor
timestamp: December 05, 2020, 07:14:29 am
content: You had been warned in your original topic:Quote from: tggzzz on November 25, 2020, 11:20:06 pmGood luck......

author: LootMaster
author_rank: Regular Contributor
timestamp: December 05, 2020, 07:39:35 am
content: The plastic fused together its been 36 years.Guess I'm no expert at removing 36 year old fans, blame me....Even the pros, rarely get it.https://groups.io/g/TekScopes/search?q=colletI contacted some people over there, a few of them have lathes/printers and made some.Just widening my contacts now.

author: tggzzz
author_rank: Super Contributor
timestamp: December 05, 2020, 09:30:42 am
content: Quote from: LootMaster on December 05, 2020, 07:39:35 amI think that is aconsequenceof the problem, as I've noted here:https://www.eevblog.com/forum/testgear/help-me-refurbish-my-tek-2465-for-a-friend/msg3355342/#msg3355342QuoteTheprosdo get it - and attempt to impart the information to those with less experience. But there's a proverb: "you can lead a horse to water, but you can't make it drink".I do have a spare such collet, but it is imperfect. I fear that if I sent it to you and you didn't like it, then I would be subjected to rude comments such as this:Quote from: LootMaster on December 05, 2020, 06:14:10 am

author: LootMaster
author_rank: Regular Contributor
timestamp: December 05, 2020, 10:23:12 am
content: Imperfect? Nah, probably wont fit and fall off.

author: tggzzz
author_rank: Super Contributor
timestamp: December 05, 2020, 10:51:59 am
content: Quote from: LootMaster on December 05, 2020, 10:23:12 amIt hasn't on one of mine.

author: LootMaster
author_rank: Regular Contributor
timestamp: December 05, 2020, 12:50:46 pm
content: well I would like a metal one if possible?And not from a working model if possible.Dont wish to cause a problem now on your scope

author: med6753
author_rank: Super Contributor
timestamp: December 05, 2020, 01:11:49 pm
content: I have successfully fixed mine with epoxy.
Keithley 197A LCD Wanted - Page 1
Forum section: electronics / testgear

author: WomblingFree
author_rank: Newbie
timestamp: December 05, 2020, 06:55:34 am
content: Would anyone have a LCD for the 197A that they'd post to Australia?Mine has a blemish at one corner which, in my experience, means its edge sealing has failed.Would consider just the LCD or the display board. Don't care if the backlight is dead.cheersMalcom
DSO 31O2A USB Interface Difficulties - Page 1
Forum section: electronics / testgear

author: TonyT3hSl33p3r
author_rank: Newbie
timestamp: December 05, 2020, 05:54:45 am
content: Hello EveryoneI have picked up my first Oscope, for personal use, and it is a used HP Agilent DSO3102A from eBay. I am having some trouble with the USB interfacing.-The USB add-on board N2865A is not recognized on startup.-The firmware flash on this thing is 3.x.x.x-When I connect the USB-A cord to the Oscope and my win10x64 PC the device manager picks it up however, I am unable to get the device to recognize.-The Keysight tech support page has corrupted 04.02.15 Firmware versionsCursory searches of google do now show anyone "solving" these issues.Is there a RIGOL firmwire/driver that I could somehow make work? I wanted this unit in particular as the USB interfacing seems useful. However, I am contemplating returning this item (cost 250 USD) if I cant get it to work as there are slightly older 500 MHz units for sale in this price range without USB.
Looking for an EMI/RFI diagnostic tool  - Page 1
Forum section: electronics / testgear

author: cbsix
author_rank: Newbie
timestamp: December 03, 2020, 05:44:49 am
content: Hi everyone. My first post here.I work on CNC plasma cutting machines and occasionally face some difficult to diagnose faults. These faults often caused by EMI/RFI as a result of poor grounding or shielding.I was wondering if an oscilloscope could be considered as a handy tool to diagnose these types of faults. If yes, what would be the minimum specs that you would recommend? A cheap USB oscilloscope, such as Hantek 6022BE or Owon VDS1022 suitable for this purpose?My knowledge in electronics fairly limited and I don't think I will be needing these oscilloscopes for any other purpose.I would appreciate any help to point me in the right direction. Thanks in advance.

author: bob91343
author_rank: Super Contributor
timestamp: December 03, 2020, 06:45:35 am
content: No simple answer. EMI is caused by either conducted or radiated noise. You need to figure out which it is. In many cases it's both.Filtering and shielding are the two basic methods of reducing this interference.

author: uski
author_rank: Frequent Contributor
timestamp: December 03, 2020, 10:23:09 am
content: I had to diagnose EMC issues and it is a specialty field in itself.You cannot expect to buy a magic instrument which will fix your issue, you cannot buy a solution, you need to acquire the knowledge to diagnose the issue.What type of issues are you exactly experiencing ? A board resetting ? RF communication issues ? EMC certification problems ? So many things can go wrong and the causes can be so different that it's very difficult to give you any valuable answer without knowing more.

author: cmumford
author_rank: Contributor
timestamp: December 04, 2020, 04:23:06 am
content: Made me thing of this:

author: David Hess
author_rank: Super Contributor
timestamp: December 04, 2020, 02:30:06 pm
content: I would consider a digital storage oscilloscope with a high voltage differential probe to be very useful for tracking down faults caused by EMI/RFI. Alternatively, a DSO with isolated inputs may be even more suitable because of its usefulness in power applications.Note however that it takes knowledge and experience to make the most of any instrument in EMI/RFI applications.
Anyone have experience with the Fluke 324 sold through Lowes? - Page 1
Forum section: electronics / testgear

author: dylanmitchell
author_rank: Contributor
timestamp: December 04, 2020, 02:57:01 am
content: Looking for an AC and DC clamp meter and saw Lowe's has a 324 Plus. Adds DC current to 324, still fewer features than a 325 but about a hundred dollars less. I have a 323 I like but it doesn't do DC.Want basic clamp meter for around the house, in the garage, and automotive troubleshooting. I do want True RMS, DC capability, prefer CAT IV 300V/CAT III 600 V but CAT III 300V is ok, want an Inrush or Min/Max button and hold button. Amprobe AMP-25, Fieldpiece, Uni T, and other have options too.I'm in the U.S. 120/240 VAC 60H or 12 VDC auto.

author: J-R
author_rank: Super Contributor
timestamp: December 04, 2020, 09:56:51 am
content: The Amprobe AMP-330 might check enough boxes for you. Two weak points I've noticed are that it only can go down to tenths of a volt and delta/zero is lost when entering crest mode (works fine in min/max/avg). Otherwise it's been solid. $200 (Approximate US street price)You should also snag a Uni-T UT210D or E. It's almost wrong to not have one regardless, considering the bang for the buck. $50I do carry an AMP-25 along with an AM-47 in my tool bag. The AMP-25 is a bit weak on features and has some annoyances, but DCA accuracy has been excellent. Good compact combo. $120 + $35I also have the UEi DL489, which has mV AC resolution and a dedicated mV DC range (down to 0.1mV). But honestly it's awkward to use so I can't quite recommend it. $165Side note, the first UT210D and DL489 units I got were faulty. No issues with the replacements.Another setup to consider is a current clamp that connects to your DMM (or scope). The PDI CA-60 for example, or something better if your budget allows. $100
RIGOL DS 1202E Z - Page 1
Forum section: electronics / testgear

author: supertrabuco
author_rank: Contributor
timestamp: December 03, 2020, 11:20:43 pm
content: Hola a todos, tengo un Rigol ds 1202 que cuando pulso la tecla AUTO no nfunciona y sale en la pantalla el siguiente mensaje AUTO DISABLED, esaria agradecido de si alguien me podria decir como solucionarlosaludos y gracias

author: EEVblog
author_rank: Unknown
timestamp: December 04, 2020, 02:12:06 am
content: This is an English speaking forum only please.
Ground/earth bridge tabs for Siglent PSU? - Page 1
Forum section: electronics / testgear

author: bayjelly
author_rank: Regular Contributor
timestamp: December 06, 2020, 07:36:02 am
content: I've got an SPD3303C (the one with the 7 segment displays instead of the LCD), and it's been great so far. However, whenever I want to connect earth and ground together, I do so shoddily with some wire.What do you use to bridge them together? Were there maybe some metal tabs in the package that I just didn't notice?

author: tautech
author_rank: Super Contributor
timestamp: December 06, 2020, 07:46:44 am
content: No provided links IIRC as these are an isolated output PSU and as such a mains earth connection is not normally used. It's only brought to the front panel for convenience should you need it.If they're like the X model PSU's the binding posts are cross drilled so it's easy to strap them with a short piece of wire.Why do you want to strap circuit ground/neg to mains protective earth ?

author: tautech
author_rank: Super Contributor
timestamp: December 06, 2020, 08:23:22 am
content: These are probably what you seek:https://www.pomonaelectronics.com/products/hardware/shorting-link-binding-posts

author: bayjelly
author_rank: Regular Contributor
timestamp: December 06, 2020, 10:35:08 pm
content: Quote from: tautech on December 06, 2020, 07:46:44 amA piece of wire is what I want to replace, since it's in the way and tends to fall out when using the drill holes for other wires.QuoteBecause while it's nice to have an isolated PSU, often-times I don't care about the isolation and instead want to have my devices hooked up to it referenced to the same ground as my computer, oscilloscope, and other non-isolated devices. Those will reference the device to earth anyway, and I prefer that to be consistently so, rather than when I, say, hook up the oscilloscope probe ground clip.QuoteThose look like they'll do the job, thanks.
Datron Wavetek 4920 AVMS Vol 1 and Vol 2 - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: December 03, 2020, 01:09:04 pm
content: I was wondering if as a collective community of enthusiasts we might be able to turn up what appears the only two oustanding/unavailable manuals for the Datron Wavetek metrology equipmentWhile the 4920M is close to the AVMS there were two service manuals assigned and printed.4920 Maintenance Handbook 8502654920 Reference Handbook 850266It would be great if we could add these to the collective community knowledge base.I am more than willing to pay shipping costs for a hard copy, digitize and return said manuals. Copies would be shared on Ko44b and BAMA and thus spread from there.As an aside the 4950 never had any service docs and Norwich refuses to release any engineering docs. Sigh, yet they called it old and obsolete.....
Datron 1271 Wavetek Vol 1 and Vol 2 manual corrections - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: December 04, 2020, 12:34:47 am
content: I have discovered that I had missed inserting a section in the Datron Wavetek 1271 Vol 1 and Vol 2 manuals that I have previously uploaded to Ko44b, BAMA and XDEV.I have sent them all corrected copies, Vol 1 new date is 10/26/20 and Vol 2 12/03/20.I don't know how long before they are posted but if you can update your copies when they appear that'd be great!

author: tautech
author_rank: Super Contributor
timestamp: December 04, 2020, 01:22:01 am
content: Don't you think this thread could have been better as a post attached to this thread ?https://www.eevblog.com/forum/testgear/datron-wavetek-1271-and-1281-self-cal-circuits-woes-and-repair-pt-1a/FYI, your Profile>Summary>Profile Info>Show Post...>Topics will show all the threads you have started where you can add further relevant info to the topic of that thread.

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: December 04, 2020, 01:42:48 am
content: Perhaps, but if someone is not watching a thread then it will be missed. I hate passing on an incomplete copy and having people think it is complete. Just a sense personal responsibility for what I have sent out.

author: tautech
author_rank: Super Contributor
timestamp: December 04, 2020, 01:48:32 am
content: Quote from: volvo_nut_v70 on December 04, 2020, 01:42:48 amWhy not keep all relevant info about Datron Wavetek 1271 in one thread ?It also gives you the opportunity to bump your existing thread to the top of the TE board.I'm all over and out. Good luck with plastering relevant info about aone model of equipment all over the forum.

author: alm
author_rank: Super Contributor
timestamp: December 05, 2020, 07:22:02 pm
content: Thanks for posting the updated versions!As far as I can see, KO4BB and xdevs.com have not posted the updated version yet, and BAMA does not show timestamps, so it's hard to check if the files there were updated.
Tektronix 465 calibrator - Page 1
Forum section: electronics / testgear

author: Endckr111
author_rank: Newbie
timestamp: December 02, 2020, 05:16:15 pm
content: Hi AllNew to the site, and hoping someone can help with this tektronix 465 I have recently purchased.This is my first oscilloscope, which I need for repairing some ham radio gear. I plugged it in and all seemed well, attached probe to calibrator and chan 1 I get two horizontal lines, on chan 2 I get a sine wave, but it is very jagged un- smoothed, all the way along trace,would this be a problem with a duff cap?Any help would be most welcomeCheerMark

author: james_s
author_rank: Super Contributor
timestamp: December 02, 2020, 06:48:26 pm
content: You're going to need to post some pictures, including one that shows how all of the controls are configured. The calibrator should give you a square wave, on an analog scope you will mostly see the top and bottom edges. If you're seeing two continuous horizontal lines that suggests that the scope is not triggering. These instruments require some expertise to set up and use properly and my first suspect is user error. A good start is to read the manual from front to back and learn what all of the controls do.

author: bob91343
author_rank: Super Contributor
timestamp: December 02, 2020, 08:34:56 pm
content: Two horizontal lines also could indicate unsynchronized square wave display. Put the triggering into AUTO mode and the channel you are viewing and turn the sweep speed control slowly over its range and you should find a few positions where a square wave is displayed.

author: 0culus
author_rank: Super Contributor
timestamp: December 03, 2020, 03:59:51 am
content: Trigger to AUTO as Bob said, trigger source to channel 1. Then twiddle the horizontal control till you find the right sweep speed. For the calibrator signal, this will be fairly slow (microseconds/div). As for channel 2, sounds like a probe compensation issue maybe? You'll need a non inductive tool to adjust the little trimmer for low frequency compensation (usually on the box that plugs into the scope, but there's exceptions) till you get a nice flat square wave.
Uni-t UT-61E Modification Alternatives, Rechargeable  - Page 1
Forum section: electronics / testgear

author: EDO
author_rank: Newbie
timestamp: September 25, 2019, 11:23:24 pm
content: It seems that a lot off modifications with this Multimeter is of course related to the 9v battery and its current consumption. Auto power off modification, or adding back light LED , or many others is considering the current draw and how long before replacing the 9V battery.One alternative might be a 7.4 Li-po or Li-ion battery that is commonly used in drones and other toys. Almost same size as 9v, permanently mounted, with the charging port accessible.Ut61e battery warning light turns on around 5.5v. and accuracy of the meter is very good all the way down to 3V.I wanted to get your opinion on this idea !!

author: genghisnico13
author_rank: Regular Contributor
timestamp: September 25, 2019, 11:37:53 pm
content: There are a lot of rechargeable "9V" (2 cells in series) Lipo/ion batteries on Aliexpress/eBay. searching "9V rechargeable lithium" should bring up several results. in the PP3 form factor(Regular 9v battery).

author: Datman
author_rank: Regular Contributor
timestamp: December 25, 2019, 09:36:57 am
content: In many years I used that multimeter, I don't remember if and when I replaced the battery and I never left it turned on...

author: tszaboo
author_rank: Super Contributor
timestamp: December 25, 2019, 09:52:00 am
content: This is what I use. 1 in meter, 1 on charger.https://www.aliexpress.com/item/32991618121.html

author: Datman
author_rank: Regular Contributor
timestamp: December 02, 2020, 09:36:26 am
content: Li-ion batteries don't need to be kept in charge, because their auto-discharge is very, very low.
HP3403C marvels [PHOTOS] - Page 1
Forum section: electronics / testgear

author: doktor pyta
author_rank: Frequent Contributor
timestamp: November 30, 2020, 10:34:09 pm
content: HP3403C Thermal true RMS voltmeter was described here:https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjM65qdpqvtAhXvsosKHY4EBBUQFjAAegQIBhAC&url=https%3A%2F%2Fwww.hpl.hp.com%2Fhpjournal%2Fpdfs%2FIssuePDFs%2F1972-03.pdf&usg=AOvVaw1-sijFA3DVbpn2LUXb0p3DThere are lots of pictures of the guts over the net:https://www.holzleitner.com/el/hp-3403/index-en.htmlHowever I've never seen the heart of the device: thermal RMS converter and special hybrid which is driving the heater over 100MHz bandwidth.An occasion occurred when I got non working 3403C with broken thermal converter.Photos taken using 2K 60FPS V8 38MP HDMI USB C-Mount Industry Camera Microscope + Stand Lens Light bought from ebay seller lapsun_kit.Get Yourself something to drink and admire.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: December 01, 2020, 01:39:59 am
content: The HP 3403C shows up in Application Note 106 by Mr. Williams:https://www.analog.com/media/en/technical-documentation/application-notes/an106f.pdf

author: enut11
author_rank: Super Contributor
timestamp: December 01, 2020, 06:52:07 am
content: Love your pix on the 3403. I have one and can vouch for its accuracy all the way to >100MHz. A fine example of HP design and manufacturing skills. Thanks for this post.enut11

author: doktor pyta
author_rank: Frequent Contributor
timestamp: December 01, 2020, 11:43:11 am
content: For those who still don't get it.What you see is a heater attached to multi junction thermocouple.Junctions are connected in series to get higher output voltage.

author: coppercone2
author_rank: Super Contributor
timestamp: December 02, 2020, 08:18:59 am
content: always wanted it but I got a later model digital true rms thermal meterits a real nice circuit it seems trustworthy from simple principlesthe old HP nanovolt meter is nice also
Any hacks for the Rigol DG1022Z arb. func. generator or DP712 DC power supply? - Page 1
Forum section: electronics / testgear

author: flarn2006
author_rank: Newbie
timestamp: March 10, 2018, 07:22:21 pm
content: I bought these devices online, and I don't have them yet, but I was hoping someone will have hacked it to get the extra features. Will the same hack for the DS1054Z work if I know the right feature codes? Or is the private key different or something?

author: Gandalf_Sr
author_rank: Super Contributor
timestamp: March 11, 2018, 01:00:23 am
content: I'm pretty sure that Riglol doesn't work for the DG1022Z, I've ordered one too but wasn't aware of any upgrade path - hacked or legal. The DP832 power supply can be upgraded via Riglol; not sure about the DP712 but it looks like there is no upgrade path for that either.In both cases, I don't think there's a higher model available that uses the same hardware.I still think they are both good pieces of gear that are reasonably priced. The DG1022Z has bigger brothers, the DG1032Z and the DG1062Z and there's an option to expand the number of points an arbitary waveform can have up to 16 Mpts.Not sure why nobody's hacked the DG1022Z yet.

author: flarn2006
author_rank: Newbie
timestamp: March 11, 2018, 02:08:44 am
content: If you go to Rigol's pages for the devices (DG1000Z seriesandDP700 series), go to the Accessories tab, and expand Options, you can see some upgrades available for purchase. The function generator has one that expands the arbitrary waveform memory depth to 16M, and the power supply has three options available: an external triggering function, a 1mV/1mA resolution upgrade, and a programmable sweep timer.

author: flarn2006
author_rank: Newbie
timestamp: March 22, 2018, 05:44:46 pm
content: Just to update, I did receive these devices the other day, and yes, there is a way to install these upgrades. The power supply has a built-in UI to enter license numbers (unlike the scope, you have to actually select the feature you're entering the code for first--not sure if it'll then only accept codes for that feature) but the function generator can only be upgraded over the USB or network connection for some reason.

author: Arek_R
author_rank: Regular Contributor
timestamp: November 30, 2020, 09:44:57 pm
content: Any updates regarding DP700?I could really make use of that sweep timer.

author: ElectronMan
author_rank: Regular Contributor
timestamp: December 01, 2020, 03:00:51 pm
content: Quote from: Arek_R on November 30, 2020, 09:44:57 pmHave a look here:https://www.eevblog.com/forum/testgear/rigol-dp711-and-dp712-new-1ch-psu/msg1158115/#msg1158115
Hantek lcr meter kelvin pcb project - Page 1
Forum section: electronics / testgear

author: coromonadalix
author_rank: Super Contributor
timestamp: August 28, 2020, 08:40:51 pm
content: Just to let you know from Voltloghttps://github.com/voltlog/kelvin-leadsNo afilliation

author: rvalente
author_rank: Frequent Contributor
timestamp: August 30, 2020, 04:28:45 pm
content: Quote from: coromonadalix on August 28, 2020, 08:40:51 pmAs featured in hackaday? Very nice!

author: voltlog
author_rank: Regular Contributor
timestamp: November 30, 2020, 07:29:27 am
content: Thanks for the mention, there is also a video associated with that project:

author: Electro Fan
author_rank: Super Contributor
timestamp: December 01, 2020, 05:39:35 am
content: Quote from: voltlog on November 30, 2020, 07:29:27 amDo you have any measurements that show the difference between using the guard vs no guard?Thx
OLED display Agilient U1253B meter  -  recompense for repair - Page 1
Forum section: electronics / testgear

author: pwrtrnx
author_rank: Newbie
timestamp: October 26, 2020, 05:43:06 am
content: Display repair for Agilent U1253B multimeter ( 6 year old OLED display faded away )Hello all, I have one of these ( my company does ) - I would be quite happy to pay a good figure to anyone who can perform a quality display replacement - ideally with a very similar LCD display so that further work is not necessary, i.e. the repair will last.Failing that a newer OLED display for an effectively interim repair ...I have seen the other posts on here as to how to go about it - but they appear at first glance to be technically not quite complete or fulsome - some efforts give a reversed display etc.I look forward to genuine replies from possibly amateur, semi-amateur or more professional people - who have the requisite ability.

author: uski
author_rank: Frequent Contributor
timestamp: October 26, 2020, 07:35:51 am
content: There are very complete information with this post, along with an offer to get PCBs for very cheap and part numbers :https://www.eevblog.com/forum/testgear/replacing-oled-screen-on-an-agilent-u1253a-multimeter/msg3085696/#msg3085696If you do not want to do it yourself, I suggest you ask in that thread if someone is willing to do it for compensation.

author: uski
author_rank: Frequent Contributor
timestamp: October 26, 2020, 08:20:12 am
content: Okay, good luck.

author: pwrtrnx
author_rank: Newbie
timestamp: November 30, 2020, 07:58:28 am
content: Hi all, successfully repaired the OLED display - many thanks to all the pointers to TAOBAO and other top tech tips w.r.t. soldering the thin flex pcb connectors ...!
new Fluke 110 dmm? - Page 1
Forum section: electronics / testgear

author: paulbt
author_rank: Regular Contributor
timestamp: November 29, 2020, 03:32:57 pm
content: Hi, everyone!I recently saw this new Fluke 110 in TME's catalogue and it caught my attention. Looks similar with Fluke 114 (except "AutoV LoZ"), same specs and it's cheaper.https://www.tme.eu/gb/details/flk-110_erta/portable-digital-multimeters/fluke/fluke-110-erta/One strange thing for me is that on fluke.com I could not find it. Also I tried to google "Fluke 110" and I mostly saw an older version of 110 and 110 plus.Is there someone who already owns one and can tell us more about it? Like box content, years of warranty, made in ... , impressions on materials/assembly look and feel (maybe compared to his bigger brothers 115 or 117), what does "ERTA" means?

author: Wytnucls
author_rank: Super Contributor
timestamp: November 29, 2020, 04:13:32 pm
content: TME has no stockERTA: possibly only available in specific countries: Europe, Russia, Thailand, Asia?

author: paulbt
author_rank: Regular Contributor
timestamp: November 29, 2020, 04:40:13 pm
content: Quote from: Wytnucls on November 29, 2020, 04:13:32 pmI've talked to them and they told me that only if I place an order and pay in advance, it will be delivered to me in ~3 weeks. Otherwise they will not have them on stock.
BM235 randomish ghosting on display - Page 1
Forum section: electronics / testgear

author: rjardina
author_rank: Contributor
timestamp: November 12, 2020, 07:55:13 pm
content: Having and issue with ghosting on BM235 but only doing it in; Ohms, continuity, capacitance, and microamps.Some of the ghosting are of segments that are not even used in those modes.Fresh batteries, cleaned the connector between the PCB and display. Don't think it's the rotary because it does it in capacitance but not in diode.Any ideas?Thanks

author: paulbt
author_rank: Regular Contributor
timestamp: November 27, 2020, 11:48:39 pm
content: Hi !Maybe the ambient light has something to do with this ghosting. If you go outside with your meter (in sunlight, partial shade or sun behind the clouds) you can still see that?

author: TurboTom
author_rank: Super Contributor
timestamp: November 28, 2020, 10:26:54 am
content: Improper alignment or not enough contract pressure of "zebra strip" LCD connector?

author: AVGresponding
author_rank: Super Contributor
timestamp: November 28, 2020, 02:36:10 pm
content: Could also be some contamination on the zebra strip and/or the contact pads.

author: J-R
author_rank: Super Contributor
timestamp: November 29, 2020, 05:59:02 am
content: I wouldn't suspect the LCD is the issue as it works fine in some modes. Double check the batteries and battery contacts? How does it behave with the backlight on?
Hantek digital oscilloscope DSO2C10 - Page 1
Forum section: electronics / testgear

author: Sean8735
author_rank: Newbie
timestamp: November 27, 2020, 04:33:49 pm
content: Hello,I am a beginner, and looking to purchase my first oscilloscope. As a beginner should I buy this Hantek digital oscilloscope DSO2C10 for a price of $245.11 cad. or should I save up and get something more trusted like a Rigol DS1102E 100MHz Digital Oscilloscope?Thanks to anyone who can help.

author: Microcheap
author_rank: Frequent Contributor
timestamp: November 28, 2020, 11:21:42 pm
content: There's already another similar thread:https://www.eevblog.com/forum/testgear/what-is-a-hantek-dso2d10/
sds1104x-e C4 Trace problem - Page 1
Forum section: electronics / testgear

author: bitt2delcid
author_rank: Newbie
timestamp: November 28, 2020, 01:50:31 am
content: Hi Everyone,I apologize if someone already asked this but I have been looking in this forum and I didn't find any information about the following issue.I recently bought a SDS 1104X-E oscilloscope; I am now writing some scripts to control it using my Ubuntu laptop. When I run the lineecho "C4: TRACE ON"> /dev/usbtmc0(where "C" is the channel) the oscilloscope just ignores it. If I run the same line but for C1,C2 or C3 everything works. I turned C4 manually and then set up the voltage per division using the script and it worked. Can someone point me to the right place to start debugging this issue? any help will be highly appreciatedregards,-Bitt

author: tautech
author_rank: Super Contributor
timestamp: November 28, 2020, 02:59:07 am
content: Welcome to the forum.Just to be sure, do you have the latest firmware installed ? Please state the version.As a further check can you confirm you are using the latest programming guide :https://int.siglent.com/u_file/document/ProgrammingGuide_PG01-E02C.pdf

author: bitt2delcid
author_rank: Newbie
timestamp: November 28, 2020, 04:19:05 am
content: Hi tautech,Thanks a lot, I updated the firmware it went awayRegards,-BittPS: if anyone happen to have the same issue you can get the latest firmware from here:https://siglentna.com/service-and-support/firmware-software/digital-oscilloscopes/

author: tautech
author_rank: Super Contributor
timestamp: November 28, 2020, 05:02:35 am
content: Nice, good work !Just checked the release notes and your SCPI issue is not mentioned however a few other SCPI commands were fixed.On Siglents international website (the server is US based) it's easy to check the notes as there's a special link to do so on latest versions of FW.https://int.siglent.com/download/firmwares/?ProId=12

author: bitt2delcid
author_rank: Newbie
timestamp: November 28, 2020, 02:54:13 pm
content: Yeah, I read the notes and it didn't appear there. I was not aware of the other bugs they fixed but I will keep an eye on it to make sure things are running well from now on. Thanks again for your help!
Kyoritsu 1021R multimeter - Page 1
Forum section: electronics / testgear

author: vutt
author_rank: Contributor
timestamp: June 13, 2020, 11:24:50 am
content: Hi!Long time EEVblog YT channel watcher, first time forum poster here.I have been using a long timeKyoritsu model 1009entry level multimeter. It is still working just fine. It is just a little bit slow side. Recently I felt need for secondary general purpose multimeter. Since this brand served me well I went down with not so cost effective route and bought new one from same brand.So I ended up with1021R model.Positives:A lot faster than 1009Bigger, back lit screen, although with less contrast than 1009A lot nicer probes, doesnt miss a beat with continuity testCurrent measuring is simpler to use one 10A terminal, it also allows me for upgrade path - it supports external clamp sensorsTrueRMSMeasuring precision is also slightly higher compared to 1009So what about safety (this is one of the reasons I'm leaning towards bigger brands in sub 100€ price range)It is rated CAT IV 300V / CAT III 600V / CAT II 1000V - not that relevant to my use cases, but it's nice to have capability for rare cases I might need itFuse is nicely contained in separate compartment with correct values in line with ratingPCB pic:Q: Could you educate me. What's that clear glass component with "202 T08M" markings next to two green bulky MOV-s (or PTC-s)?All in all I'm happy with purchase. Since I didn't find previous discussions about this model here decided to share some pics here.

author: AVGresponding
author_rank: Super Contributor
timestamp: June 13, 2020, 11:29:18 am
content: Loving the neon used as a GDT, almost makes you wish for a view port so you can watch as you deliberately overload it!

author: fanOfeeDIY
author_rank: Unknown
timestamp: June 13, 2020, 01:14:54 pm
content: It is probably this GDT. Typically called SPD in Japan somehow.https://www.okayaelec.co.jp/products/search/index.php/search?cell003=サージアブソーバ&cell004=基板実装タイプ

author: vutt
author_rank: Contributor
timestamp: June 13, 2020, 02:49:18 pm
content: Thanks fanOfeeDIY for link!If it's GDT then those green ones are most likely PTC-s.

author: fanOfeeDIY
author_rank: Unknown
timestamp: June 13, 2020, 03:51:52 pm
content: The green ones are definitely PTCs, somehow they are mostly written as polyswitch or resettable fuse, and rare to see PTCherewritten in Japan

author: sleepymaker
author_rank: Newbie
timestamp: November 27, 2020, 09:31:56 am
content: How about the features and ranges?Is it able to measure milliamps and microamps?
How old is my Fluke 289? - Page 1
Forum section: electronics / testgear

author: 1980s_john
author_rank: Contributor
timestamp: November 26, 2020, 11:13:10 pm
content: Hi,I recently bought one second hand, working fine. I am unsure when it was made, please advise. Under Meter Info it shows the following:Model: FLUKE 289Serial #37520xxxFirmware Version: 1.16 / V0.88Calibration Date: 12/01/17 (in UK format, or 01/12/17 in US format)Calibration Counter: 1Board ID: 3ARM Bootloader Version: V2_0_74 - built 08:38:05, Jun 25 2010MSP Bootloader Version: V1.0Calibration Version: V0.14I think some people read the above built date and think this is when it was made in factory, I think this is when the software was built on someone's computer which may be years before the meter was manufactured.I assume the board ID means this one has a super capacitor, I haven't opened it up to check. Only had it a week and the batteries were not brand new, but it keeps good date and time when off for several days.Thanks for any info,John

author: retiredcaps
author_rank: Super Contributor
timestamp: November 27, 2020, 12:41:54 am
content: If I recall correctly, I believe when it says "Calibration Counter: 1", that's the initial factory calibration after the unit has been built. So I'm guessing your unit was built in 2017.If you have alkalines in the 289, take them outNOW!Many have reported leaking alkalines in their 289s and replacement battery tabs are not cheap. Many have successfully used low self discharge nimh like eneloop with no leakage problems. Lots of info with pictures on this forum.
HP 8561E internal spur - Page 1
Forum section: electronics / testgear

author: Miti
author_rank: Super Contributor
timestamp: November 26, 2020, 08:45:22 pm
content: This may belong in the repair section but the instrument is customer owned, therefore I can’t touch it.An Hp8561E shows a spur a bit over 3.5GHz with a 50 Ohm terminator at the input. If I move a bit the center frequency or I reduce the span from 50 to 48 MHz, the spur disappears. Did you see this defect before?Cheers,Miti

author: tautech
author_rank: Super Contributor
timestamp: November 26, 2020, 09:17:29 pm
content: Level ?Some SA spurs are normal but they are generally way down near the noise floor.Best advice is to get to know your instrument well and where they might be and at what settings they arise.

author: Miti
author_rank: Super Contributor
timestamp: November 26, 2020, 09:41:38 pm
content: Peak level is about -66dBm.I told the customer that reducing the span solves the issue, but they insist this indicates a malfunction and it needs to be repaired. I’m curious if anyone can repair that.

author: tautech
author_rank: Super Contributor
timestamp: November 26, 2020, 09:52:44 pm
content: It might be a fault IDK and more tests may be needed.Don't discount the sensitivity of a SA can find all manner of unexpected signals which is why my cellphone now goes some distance away from my SA when doing low level measurements.

author: Bud
author_rank: Super Contributor
timestamp: November 26, 2020, 10:20:37 pm
content: HP was very good back in the time to document spur performance. I say check with the User's / Opetator's Manual , they may have spur chart in the specs section.

author: Miti
author_rank: Super Contributor
timestamp: November 26, 2020, 11:55:53 pm
content: Quote from: tautech on November 26, 2020, 09:52:44 pmNo, it's not external. As I move the center frequency slowly to the left (lower frequency), the spur comes and goes 3 - 4 times, always toward the right side of the screen, before it goes away for good. It's not one peak that I can move left and right on the screen.

author: Miti
author_rank: Super Contributor
timestamp: November 27, 2020, 12:00:26 am
content: Quote from: Bud on November 26, 2020, 10:20:37 pmInteresting, I didn't know that. However, in this case, I couldn't find anything.
Rigol DP832A/DP831A random reboots (FIX) - Page 1
Forum section: electronics / testgear

author: b01n9
author_rank: Newbie
timestamp: November 25, 2020, 05:14:40 pm
content: I encountered the random reboot issue on a DP832A a few years back. Unfortunately I never took notes or pictures then, but from what I remember, this was a brown-out issue in a -4.2V supply voltage of one of the front panel control chips. If I remember correctly what I found then, this voltage is actually controlled by a firmware setting, but then again, I could be wrong. In any case, this appears to be caused by component aging, as I had to fix the same problem in a DP831A today, which experienced reboots at increasingly smaller periods (weeks to days to hours). This was the same behaviour as with the DP832 earlier. Both supplies run 24/7/365 for years now, and we primarily use them to conveniently remotely power cycle some SPARC development boards.Anyways, the fix is simple enough: Take a random, large enough cap (>1 mF should do) and attach it between the test pad labelled VDD4P2 on the front panel control board and the positive supply rail somewhere on the board. Since it is exposed on the pads where the boards screws to the chassis, I just fixed a wire there and hot-snotted the cap to the PCB so it would not flop around. See the attached pictures for reference.I hope this is of help to someone.

author: b01n9
author_rank: Newbie
timestamp: November 26, 2020, 10:03:54 am
content: Ah, thanks for pointing it out. I did a quick search only, I suppose I missed that one.
Precision Standards Corp Transistor tester 70A (UK) - Page 1
Forum section: electronics / testgear

author: 1980s_john
author_rank: Contributor
timestamp: November 26, 2020, 08:52:17 pm
content: Hi,One of these is currently for sale in the UK:https://www.ebay.co.uk/itm/A-rare-old-vintage-Precision-Standards-Corp-semi-conductor-test-set-model-70A/323848847784Google shows nothing for this and very little for the company. I guess without a manual it would be very little use, looks well made from the outside though with no means of knowing how to adjust it makes a nice boat anchor. Appears to come with a fixture for RF transistors, again with no other fixtures not a lot of use for other types.Regards,John
Leader 520 MHz counter worth fixing? - Page 1
Forum section: electronics / testgear

author: iXod
author_rank: Frequent Contributor
timestamp: November 24, 2020, 08:00:32 pm
content: Model LDC-824S has fixed display error (same repeatable display segments on power-on; see photo). Was nearly free, so if it's not the infamous unobtanium Toshiba TC5032 display controller IC, I'd like to resurrect it.No change in display when pressing of any buttons.Any other Leader counter fixers here?Thanks.

author: LazyJack
author_rank: Frequent Contributor
timestamp: November 25, 2020, 01:07:32 pm
content: Are you sure it is a display errror? Is there any way to verify that the counter itself is working?

author: Stray Electron
author_rank: Super Contributor
timestamp: November 25, 2020, 03:28:48 pm
content: I have the 250MHz (823S) version one of these meters and it's one of my favorites to use for low frequency use. I guess that I'm tired of everything having red displays and I like the color the Leader display. The S models have a highStability time base and I've found them to be quite accurate. Is it worth fixing? It really depends on if it is adequate for your needs. If not, then don't bother to fix it. But if it is then I'd say that you should try. Sorry, no repair manual. Like most Japanese equipment their quality is very good but they just don't seem to publish repair manuals. So as much as I like Anritsu, Leader and some of the other Japanese brands, I try to avoid them when possible.If you do tear into your's and you find out what the difference is between the 250 and 520 MHz versions are, I'd like to know.PS if you haven't then the first thing that I recommend is that you check the oscillator output on the rear panel and be sure that it's working. Also the switch on the rear needs to be set for the Internal clock. You may have nothing worse than a dirty switch that isn't making contact.PSS the oscillator in my 823S reads 10.000 010 MHz and is absolutely stable when checked on my very accurate HP 5343A.

author: iXod
author_rank: Frequent Contributor
timestamp: November 26, 2020, 08:32:12 pm
content: Thanks for the suggestions. Oscillator output (rear panel BNC) is rock-steady at just a few clicks over 10 MHz, 4v. (This is an "S" option model.) Switch has continuity.Is it a worthwhile troubleshooting technique to use an external 10 MHz reference?
ProDigit 3211F/3202F Electronic DC Load & Mainframe - Any Good? - Page 1
Forum section: electronics / testgear

author: AJ3G
author_rank: Regular Contributor
timestamp: November 11, 2020, 10:39:47 pm
content: All:I am going to attempt a repair on a ProDigit 3311F and its 3202F Mainframe. I have never heard of this company, and there does not seem to be a lot of reviews about them online. I bought the DC Load, because the price was right if I can repair it. Is this stuff any good, anyone have any experience with the ProDigit Brand?Rich

author: AJ3G
author_rank: Regular Contributor
timestamp: November 26, 2020, 09:29:37 pm
content: Hi All:Since I got it in, thought I would comment. The ProDigit Brand does seem to be a very well built, high quality instrument. The poor quality item I have seen was in the Main Frame, where there is a less than stellar soldering job on one of the high density Microprocessors. This may be from someone else getting their hands on the circuit board after it left OEM.Unfortunately, whoever owned this thing apparently put the AC Voltage Select Switch to 115VAC and then applied 240VAC to the mainframe. I think the DC Load was spared, but it looks as though every Bridge Rectifier in the Mainframe has been blown out. The output of the four supplies all have 60Hz AC Voltage, which means none of the rectifiers are doing their jobs. I just hope it stopped at the bridge rectifier, but am not overly optimisticRich
LAN Cabling Testing and Certification - Page 1
Forum section: electronics / testgear

author: JohnWW
author_rank: Contributor
timestamp: August 14, 2020, 02:39:05 am
content: Hello FolksI am looking for a LAN cable tester and certification that doesnt cost thousands of dollars. I already own the Pockethernet which does a great job but it not a certification. The product that do what I am looking for are the fluke DSX's or the Ideal testers.Understand that from a final cerification would alway need to come from a mega bucks tester like the fluke or ideal. I am just looking for a meter that I could own that would let me test cross talk and other things when i am istalling the cable instead of waiting to certifation to find out I have a problem.Kind of looking for a NanoVNA for network cable.ThanksJohn

author: Howell
author_rank: Newbie
timestamp: November 25, 2020, 06:24:39 am
content: The Fluke CIQ-100 could be an ideal fit at less than $1,300. It should handle crosstalk detection and other troubleshooting effortlessly.But if you have budget constraint then you may want to look at used cable testers. With certified used equipment, you still get the reliability brands like Fluke and Ideal offer.The keysight WS PRO LAN cable tester would also do the job but look for some good deals onrefurbished LAN cable testers.
Probe compensation 1:1, 10:1 - Page 1
Forum section: electronics / testgear

author: Frank_MV
author_rank: Regular Contributor
timestamp: November 22, 2020, 12:51:09 pm
content: General question about probe compensation.I have switchable probes 1:1, 10:1.If I perform the compensation for 1:1, it is no longer correct for 10:1 and vice versa.How do I proceed now ?Do I have to compensate again and again when switching the divider ratio ?br,Frank

author: Miti
author_rank: Super Contributor
timestamp: November 22, 2020, 02:27:52 pm
content: Probe compensation is for 10:1 only, it shouldn't have any effect in 1:1 mode.

author: Frank_MV
author_rank: Regular Contributor
timestamp: November 22, 2020, 03:48:31 pm
content: Yes that's right, you're right. I was wrong

author: David Hess
author_rank: Super Contributor
timestamp: November 22, 2020, 04:28:08 pm
content: That is right. 1:1 probes require no compensation so the compensation in 10:1 mode has no effect on 1:1 mode.
Are AC power sources also considered to be isolation transformers? - Page 1
Forum section: electronics / testgear

author: petemate
author_rank: Regular Contributor
timestamp: November 20, 2020, 11:29:13 pm
content: Hi, I'm wondering about how AC power sources(Chroma, California instruments, etc) are wired. Are they suitable for use as isolation transformers? Provided you don't pass the ground to the EUT, of course.

author: bob91343
author_rank: Super Contributor
timestamp: November 20, 2020, 11:35:56 pm
content: I think so.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: November 20, 2020, 11:38:58 pm
content: Depends what you mean by "AC Power source". A variac for example does not provide isolation.

author: petemate
author_rank: Regular Contributor
timestamp: November 21, 2020, 12:59:31 am
content: Quote from: mikeselectricstuff on November 20, 2020, 11:38:58 pmI mean those AC power sources manufactured by e.g. Chroma. They spit out whatever frequency and voltage you set it up to. Its basically a large switchmode converter.

author: james_s
author_rank: Super Contributor
timestamp: November 21, 2020, 01:43:46 am
content: I have a California Instruments Invertron and it is isolated, the unit is essentially a huge audio amplifier driving a power transformer for the output. I don't know about other similar devices but I would expect that they are.

author: threephase
author_rank: Regular Contributor
timestamp: November 21, 2020, 10:11:23 pm
content: The BK Precision, Omicron and Megger units I have all have isolated outputs.

author: David Hess
author_rank: Super Contributor
timestamp: November 22, 2020, 04:08:58 pm
content: Even if the output does not include transformer isolation, the line connected input side will.
Picoscope MSO connections - Page 1
Forum section: electronics / testgear

author: Davesaudio
author_rank: Newbie
timestamp: November 19, 2020, 02:21:26 pm
content: GentsI have been asked to make up a cable to the digital ports on a picoscope (which I do not have).Have not been able to find the specifics but from images it looks like a c-grid 0.1inch header?Am I close or no cigar? I would hate to build it without keying.D

author: 2N3055
author_rank: Super Contributor
timestamp: November 19, 2020, 04:54:40 pm
content: Here you are... Pitch is 0.1inch

author: Davesaudio
author_rank: Newbie
timestamp: November 20, 2020, 07:57:42 pm
content: Great pictures- Thanks. I can confirm and scale from that , worst case a little file work