hybridfree/eevblog-posts huggingface dataset:
DC Electronic Load Korad KEL103 reverse polarity - Page 1
Forum section: electronics / testgear

author: MrYakimovYA
author_rank: Regular Contributor
timestamp: June 19, 2023, 01:21:10 am
content: Hello!I can't find anything about subj: what will with my Korad KEL103 do if I reverse polarity at binding post? I.e. does KEL103 failed if I connect the + of my source to - of the load and - of my source to the + of the load? User Manual says nothing about it. I have super brand Fujitsu DC Electronic Load at my work. There is a back connected diode at the binding post and reversing polarity does not harm it. So what with the Cnineese instrument?

author: GigaJoe
author_rank: Frequent Contributor
timestamp: June 19, 2023, 02:26:36 am
content: would it be possible to test with some resistor as a safety

author: BILLPOD
author_rank: Frequent Contributor
timestamp: June 19, 2023, 01:24:59 pm
content: Using the continuity feature of your DMM, see if your negative banana jack, (black one), is connected to your earth ground, (green jack)

author: HKJ
author_rank: Super Contributor
timestamp: June 19, 2023, 01:28:07 pm
content: Generally DC load to not handle reverse polarity, there will most likely be about a diode drop in reverse voltage (From the diode in a MOSFET transistor).You can use an external high current bridge rectifier to improve that situation.
Agilent 1670g - Analyzer Card failure - Page 1
Forum section: electronics / testgear

author: Tarkie101
author_rank: Newbie
timestamp: June 19, 2023, 07:11:11 am
content: Rather surprisingly, the PSU on my 1670g failed a while ago, most dramatically when a loud bang and debris were jettisoned via the fan. Wind the clock forwards, I sourced a reasonably priced replacement PSU, installed it, powered up, and all appeared good.But, not.Over the weekend, thanks to some guidance here, I sourced, installed and ran the PV software which highlights that parts of my Analyzer card are caput.The tests that failed are: Communication Test, Chip Clock Test, Alignment Test, Comparators Test.The rest passed, as did all the PC tests, and the Oscilloscope tests.Firstly, any guidance as to repairs on the Analyzer card, or if thats fubar, does anyone have a 102, or 136 known working card they'd be willing to move on, can you let me know?Steve
Hameg HM307 - Page 1
Forum section: electronics / testgear

author: Fungus
author_rank: Super Contributor
timestamp: June 18, 2023, 05:43:31 pm
content: I just got hold of a Hameg HM307 CRO, it's small, it's cute, it looks to be in perfect condition, but it's been sitting in a cupboard for 25 years.I didn't switch it on yet, I'm worried about the caps inside it being bad.Question: Could I damage it just by turning it on?(I've done a bit of research and there's an awful lot of caps in there, replacing them all looks like it would be a lot of work)

author: Fungus
author_rank: Super Contributor
timestamp: June 18, 2023, 05:45:12 pm
content: Manual is here:https://cdn.rohde-schwarz.com/hameg-archive/HM307_english.pdfHere's a guy poking around inside one:

author: Grandchuck
author_rank: Super Contributor
timestamp: June 18, 2023, 06:02:47 pm
content: Series line current limiter or a variac for initial test?
PV disk for Agilent 1670g - Page 1
Forum section: electronics / testgear

author: Tarkie101
author_rank: Newbie
timestamp: June 18, 2023, 10:12:40 am
content: Im in the process of resurrecting my Agilent 1670G after the PSU failed.I've replaced the power supply, and the device passes boot up self tests, and "functions".However, I am getting a “Measurement initialisation error” which the documentation refers me to the PV disk set, which i dont have for the 1670 series.There is one on eBay, but the $50 postage to the UK, is a little prohibitive.Is there a source for a disk image?

author: PA0PBZ
author_rank: Super Contributor
timestamp: June 18, 2023, 11:03:16 am
content: It's in the OS software download from Keysight:https://www.keysight.com/us/en/support/1670G/standalone-logic-analyzer.html#driversAlso attached for convenience.

author: Tarkie101
author_rank: Newbie
timestamp: June 18, 2023, 11:14:15 am
content: Perfect! Many thanks.Ironically, I'd looked on the Keysight page for the 1670, and seen the OS image, but didnt put 2+2.For reference, its here:https://www.keysight.com/gb/en/lib/software-detail/instrument-firmware-software/1670g-series-operating-system-software-version-a0302-sw574.html
Tek P6860 Compression Probe Adapter - Page 1
Forum section: electronics / testgear

author: mbalmer
author_rank: Contributor
timestamp: June 14, 2023, 02:51:06 am
content: Some time ago, I asked a question about whether anyone had made adapters to take the Tektronix P6860 compression probe out to 0.1" header pins so that I could use it with a (then) newly-acquired TLA715 with a TLA7AA4 136-channel timing-and-state module.These probe cables are available inexpensively on eBay and other surplus equipment sites, presumably because they really aren't useful without having designed the contact footprint onto the board so you can properly probe the lines.The standard flying-lead cable that was made for the 136-channel mainframe modules (the P6810) is alsooutrageouslyexpensive on eBay -- at least as much as the empty mainframe, and often 2-3 times the cost of aloadedmainframe itself for a single probe cable. The spread I saw at the time of this post had the least expensive probe head sitting at $375 (used), one more at $599 (also used), and every other probe head being at least $1,600 ranging up to $2,000 (new) -- all for single probe cables.While a commercial adapter that breaks it out to female header sockets is available, it is also prohibitively expensive for the individual user, and while I assume that some folks may be able to afford them individually, the lack of an adapter's availability for me seemed to highlight that there needed to be something available for people like me who want to use these things without having to spend a fortune.In doing the design, I tried to make it so that you could use it in differential mode as well as the regular 16-channel mode. The nine individual ground pads (eight pairs of inputs plus CLK) can be tied together using the DIP switch. I'm populating the through-hole pin header spots with stackable wire-wrap sockets, so that you can plug in a male header or female header, and also clip scope probes to the same input lines.If someone with more experience than me has an issue with the design that they would like to point out, I'd appreciate feedback as I'm a pretty novice designer when it comes to this kind of thing.I've also had an initial run of boards made so I can test the design, but if anyone on here would like one (or more), please DM me.(edit: add images. I thought they were attached, when suddenly they weren't.)

author: RomDump
author_rank: Regular Contributor
timestamp: June 16, 2023, 12:16:19 am
content: QuoteAre you sharing the design? I didn't see a link to any files only some pictures as an attachment.

author: mbalmer
author_rank: Contributor
timestamp: June 18, 2023, 06:30:34 am
content: QuoteYes, I am sharing the design -- I've put the files up on a GitHub page:https://github.com/mabalmer/tek-p6860-adapterI had initially wanted to wait until I got the run of boards from JLCPCB to post it, but I figure it can't hurt, especially if someone wants to modify things.
Peak Atlas ESR70 kept giving high ESR reading - Page 1
Forum section: electronics / testgear

author: danpopescu
author_rank: Newbie
timestamp: June 16, 2023, 06:11:19 am
content: Hi,My Peak Atlas ESR70 consistently kept giving high ESR reading.I tried to compensate probes but it just ALWAYS fails.Readings for 1 and 10 Ohm resistors are every time wrong.Lately, ESR readings are all higher than 40 Ohm.Did someone encounter this problem?

author: Kean
author_rank: Unknown
timestamp: June 16, 2023, 06:28:15 am
content: Never seen this with mine. I suspect damage due to measuring a charged capacitor above the threshold (it can do a controlled discharge within limits).You might want to try contacting Jez from Peak. He will know the device best, and he has a forum account here @PeakAtlashttps://www.eevblog.com/forum/profile/?u=84715Also on Twitterhttps://twitter.com/peakatlas/and of course usual business contact details on their website

author: danpopescu
author_rank: Newbie
timestamp: June 17, 2023, 09:42:18 am
content: Thank you.I will try to contact Jez from Peak.
BCD-Parallel converter and Dual Channel Frequency Synthesizer Controller - Page 1
Forum section: electronics / testgear

author: wrieken
author_rank: Contributor
timestamp: February 12, 2019, 03:11:10 pm
content: Hi,I recently acquired a Dual Channel Frequency Synthesizer ND-D 1000/1000 made by Schomandl in Germany. I have contacted Schomandl and they have no documentation available.It has Frequency setting via two BCD-parallel ports. Looking on the Internet there doesn't seem to be an Ethernet or serial to BCD-parallel port cable available. Although I did find an ASCII-BCD-Parallel converter using an HP 59301A, none are available and there is no reason to believe it would work even if one was available. If someone could comment.So my question is, does anyone know how to determine the proper codes to activate it and where I can find a converter?Thanks,William

author: Golds
author_rank: Contributor
timestamp: June 17, 2023, 06:14:17 am
content: Cheers! I have the same trouble! Do you have any photos of the converter?
Repair of a Fluke 87 lll - Page 1
Forum section: electronics / testgear

author: Qmavam
author_rank: Regular Contributor
timestamp: June 05, 2023, 12:12:57 pm
content: Hi,I have a Fluke 87 lll that had over voltage AC applied.I checked all the MOVs and they seem fine.Any experience fixing an 87 lll that had too much voltage applied?What should I look at?Thanks, Mikek

author: BeBuLamar
author_rank: Super Contributor
timestamp: June 05, 2023, 02:01:11 pm
content: What does it do now? It doesn't power up? Overvotage AC applied how high was the voltage and in which mode the meter was in?

author: Fungus
author_rank: Super Contributor
timestamp: June 05, 2023, 07:33:03 pm
content: Quote from: Qmavam on June 05, 2023, 12:12:57 pmHow much is "too much"?Quote from: Qmavam on June 05, 2023, 12:12:57 pmIf it powers on and responds then try removing the two clamping transistors to see what happens.

author: BeBuLamar
author_rank: Super Contributor
timestamp: June 05, 2023, 08:10:20 pm
content: The company I work for had a number of 87III and they tend to have problem with the display. None had any other problems.

author: Ugur
author_rank: Regular Contributor
timestamp: June 06, 2023, 05:58:01 am
content: Turn it into Ohms and do you see OL on the screen? If not, check the varistors.

author: EEVblog
author_rank: Unknown
timestamp: June 06, 2023, 07:25:28 am
content: Does the display still work but it just reads zero?Check the series input resistor. I think it's a fusible type.

author: Qmavam
author_rank: Regular Contributor
timestamp: June 19, 2023, 03:21:52 pm
content: It turned out to be one MOV that was defective.Thanks all, Qmavam
Rom Files for IFR A-7550 SA - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: June 16, 2023, 03:47:56 am
content: I am looking for EPROM files for the IFR A-7550 Spectrum Analyzer newer than version 1.03.Thank you,SamW3OHM
R&S - Demystifying EMC Seminar on June 15th in Porto - Page 1
Forum section: electronics / testgear

author: Bicurico
author_rank: Super Contributor
timestamp: June 15, 2023, 07:36:13 pm
content: Hello,Today I was able to attend to the R&S seminar called "Demystifying EMC". Unfortunately I could only stay for the morning sessions.But I must say that the sessions I attended were excellent:First, spanish teacher and researcher at Zaragoza university, Arturo Mediano, made an excellent presentation on EMC, with a life demonstration! I just found the PowerPoint he used here:https://cdn.rohde-schwarz.com/it/seminario/RS_EMI_debugging_V2.6.pdfThis PDF does not justice to his presentation, where he scribbled on top of the slides and switched screens between the presentation, the videocamera showing the setup and, of course, the remote screen (VNC) of the R&S Oscilloscope.It was a brilliant demonstration and lecture. His students are very lucky!Next was:- Understanding precompliance – what, why, how (by Victor Medina, Application Engineer, Rohde & Schwarz Spain) --> great presentation on precomplicance, could have some life demo, but still it was very comprehensive- Update on CISPR standards (by Tobias Groß, Product Manager EMI Test Receiver, Rohde & Schwarz Munich)- EMI Receivers: 1 GHz Wideband testing and cost-efficient conducted testing (by Tobias Groß, Product Manager EMI Test Receiver, Rohde & Schwarz Munich)In these two presentation Tobias talked about the standards (puh, I did not realise HOW complex) and then about the brand new EMI receivers developed by R&S.I missed theses sessions:- EMC and eMobility (by Martin Wiles, Director, Strategy and Business Development, Albatross)- High value-added Rohde & Schwarz services solutions” (by Francesc Lopez, Service Sales Engineer – Rohde & Schwarz Spain)- Coffee and discussions in exhibitionThis is a shoutout to R&S to thank them (in case somebody is reading my post)!If this seminar is coming close to you, I highly recommend it.Kind regards,vitor

author: pdenisowski
author_rank: Super Contributor
timestamp: June 16, 2023, 02:23:20 am
content: Thanks for the feedback!The “Understanding Precompliance” session was most likely the one I developed and presented during the first seminar session in February. I recorded it as a video and it’s now live on the R&S YouTube channel:I also did a whitepaper version (same material, just in written form)https://www.rohde-schwarz.com/us/solutions/test-and-measurement/emc-testing/emi-precompliance/understanding-emi-precompliance-testing-registration_256454.htmlThanks again!

author: tv84
author_rank: Super Contributor
timestamp: June 16, 2023, 10:32:36 am
content: Quote from: pdenisowski on June 16, 2023, 02:23:20 amVitor just prefers to hear it with spanish accent...

author: Bicurico
author_rank: Super Contributor
timestamp: June 16, 2023, 12:01:59 pm
content: In this case it was with Italian accent!
TDS2022B should I get it - Page 1
Forum section: electronics / testgear

author: sebbonit
author_rank: Newbie
timestamp: June 15, 2023, 09:01:48 pm
content: Hello everyone.So I'm new here and facing the wall right now. I recently got a chance to buy TDS2022B without a probe for 400USD and the big question is: should I get it?Or are there any better and newer alternatives?That will be my first "real scope" because I had handheld ones and do have an old analog Tektronix TAS 455 60Mhz but I do want to buy something above 100Mhz.Thank you for all your help!

author: Smokey
author_rank: Super Contributor
timestamp: June 15, 2023, 09:08:57 pm
content: https://www.testequipmenthq.com/datasheets/TEKTRONIX-TDS2022B-Datasheet.pdfQuoteNope.

author: sebbonit
author_rank: Newbie
timestamp: June 15, 2023, 09:17:05 pm
content: Thank you for the reply!Are there any better alternatives for around the same price?

author: Momchilo
author_rank: Regular Contributor
timestamp: June 15, 2023, 09:40:58 pm
content: If you have the money, then the Siglent SDS1104X-E for 500€. For beginners (and everyone else) it is a nice scope with a lot of useful features for a fair price.Just the bandwidth is limited. If you want to measure high frequency signals, it would be the wrong scope.There is already a very long thread for this scope in this forum with all necessary and way more information. You will also find a lot of youtube videos about this model. It is very popular.If it is too expensive, I would recommend the Rigol DS1054Z for 400€. But if you have the additional 100€ it would be worth to buy the Siglent scope.
HP 400E AC Voltmeter - Clone??? - Page 1
Forum section: electronics / testgear

author: wn1fju
author_rank: Frequent Contributor
timestamp: June 24, 2023, 01:06:30 pm
content: Picked up this AC voltmeter for $20 USD. There are no identifying markings except on the bottom (see photo) where it looks like a tag (AUL Instruments ME-30F/U) has been cut out from somewhere and taped to the case.The front and back look similar to an HP 400E meter, so I compared the circuit board to the parts layout shown in the HP 400E manual. It is virtually identical down to the component numbering. In fact, the only obvious differences between this meter and the HP version seem to be:1) an additional adjustment pot for the P/S voltage2) the P/S outputs 22 VDC, not the 26 VDC in the HP 400E.3) an internal bias level is adjusted to 8 VDC, not the 10 VDC in the HP 400E4) an additional 3 MHz adjustment pot5) obviously different meter movement and case design, no ground lug on the back panel.The meter worked fine after I replaced the old-style HP AC jack that was all burnt up and missing the center pin with the more modern type.But, my question is: did HP license this design? Was this an unapproved "copy" of an HP 400E? The ME-30F/U is a USA military ID number, but why wouldn't the military simply buy the HP 400E from HP?

author: xrunner
author_rank: Super Contributor
timestamp: June 24, 2023, 01:34:37 pm
content: Probably some military requirements they wanted in the meter from hp, as you noted there are differences. Why they wanted them ... who knows now?
Battery compartment door for Fluke 51 II thermometer. - Page 1
Forum section: electronics / testgear

author: BeBuLamar
author_rank: Super Contributor
timestamp: June 17, 2023, 12:56:53 pm
content: I have this Fluke 51 ii thermometer since new for about 10 years now. I only changed the battery a couple of times (I rarely used it) but the last time I changed the battery the screw that hold the battery door broke thru made a hole larger than the screw head so it won't hold the door in any more.I wonder where I can get a replacement door and how much it would cost. I don't feel like paying a lot for it.

author: Fraser
author_rank: Super Contributor
timestamp: June 17, 2023, 01:05:29 pm
content: Fluke supply spare parts for their equipment. As to cost … no idea, you would have to ask them. I would expect such a part to cost around $10 + taxes and shipping.If you do not want to spend money on the unit, why not find a longer screw and washer to secure the battery cover or find a screw with a larger diameter head ? If you use a large diameter countersunk head, the screw will not protrude too much from the rear. Does the yellow boot not hold the battery compartment cover in place ?If all else fails….. insulation tape !

author: BeBuLamar
author_rank: Super Contributor
timestamp: June 18, 2023, 09:43:47 am
content: Yes I will call them tomorrow but I am afraid the cost is more like $50 (I can buy a used working meter for like $150). Thanks.
Rigol DM3058E temperature measurement? - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: September 09, 2018, 03:28:19 pm
content: Supposedly this DMM has presets for a Type K thermocouple.http://int.rigol.com/File/TechDoc/20151201/DM3058_DataSheet_EN.pdfeven says "Thermocouple Cold Terminal compensation is built in the multimeter" (sic).Anybody here know how to use this? I read the manual and I can't figure it out.I've done:Sensor>Property>Type>ThermocoupleSensor>Property>Unit>Degrees CWhen I hit "DONE" it says "Please set Para first" (which makes sense, I haven't told it it's a Type K yet).The manual says to press "TC>Type" and "TC>JUNC", but I can't find these in the menus.

author: xrunner
author_rank: Super Contributor
timestamp: September 09, 2018, 03:57:16 pm
content: Go to Sensor - Load - select file KITS90 - Read. I just tried it with a type K thermocouple and it works.The other method you were doing let's you input your own parameters for the sensor.

author: Unknown
author_rank: Unknown
timestamp: September 09, 2018, 04:00:59 pm
content: Thatwasn't in the manual.But it works!!!

author: xrunner
author_rank: Super Contributor
timestamp: September 09, 2018, 04:07:50 pm
content: Quote from: Dave92F1 on September 09, 2018, 04:00:59 pmJust think of us as the manual within the manual.

author: TheCalligrapher
author_rank: Regular Contributor
timestamp: June 14, 2023, 11:30:25 pm
content: Quote from: xrunner on September 09, 2018, 03:57:16 pmUm... Not sure what this is in reference to. DM3058 does not come with any sensor files preloaded in its Save/Load storage. There's no such thing as "file KITS90".Quote from: Dave92F1 on September 09, 2018, 03:28:19 pmYes, once you've entered the "Temperature" section, you will see a "Type" submenu. Hit "Type", select "TC" and you will see another "Type" and "Junc" selection. (Yes, "Type" again). Hit "Type" and you will be offered a choice of one-letter sensor types. Select "K" there and return one level up.Now, if you wish, you can enter "Junc" submenu and select either internal cold junction compensation (default) or enter a compensation value manually. Again, internal compensation is the default, so if you are happy with that you don't need to enter "Junc" submenu.Once you finished the sensor setup, you have to hit "Apply" to actually activate the sensor mode. Optionally, you can save the setup to a file inside the multimeter.

author: xrunner
author_rank: Super Contributor
timestamp: June 15, 2023, 12:58:48 am
content: Quote from: xrunner on September 09, 2018, 03:57:16 pmQuote from: TheCalligrapher on June 14, 2023, 11:30:25 pmQuote from: Dave92F1 on September 09, 2018, 04:00:59 pm

author: TheCalligrapher
author_rank: Regular Contributor
timestamp: June 15, 2023, 02:48:09 am
content: OK, apparently, I managed to misread one digit. What I said applies to DM3068. And you were talking about DM3058. Mea culpa.P.S. Next time get DM3068. 'Cause that's what I use
Sencore LC103 LCR Capacitance Meter with Leakage Alternative ?  - Page 1
Forum section: electronics / testgear

author: KG7AMV
author_rank: Frequent Contributor
timestamp: June 13, 2023, 09:47:17 pm
content: Price seems to be insane for the Sencore LC103 anyone know of a modern alternative that will not break the bank?I was looking at the Tonghui TH2689https://www.tonghui.com.cn/en/product_497.htmlfor preforming leakage tests.Any recommendations?

author: HighVoltage
author_rank: Super Contributor
timestamp: June 13, 2023, 10:02:23 pm
content: The LC103 is simply the best. The selling prices are higher now than they were when the unit was new.The previous model, the LC102 is still cheaper on the used market.If you are only after leakage current, you can always measure it manually with a power supply and uA meter.I am not sure if there are any good replacement instruments for the LC103
CT Lead length Can I extend 15”?   - Page 1
Forum section: electronics / testgear

author: DougSpindler
author_rank: Super Contributor
timestamp: June 13, 2023, 04:07:05 am
content: I purchased a panel mount AC ammeter/volt/watt meter from Amazon to monitor my EV charger. I’d like to know if I could solder to the existing CT coil 12” of wire so I can to extend it so I can mount the panel father away.Questions -Will soldering on an additional 12” mess with the calibration?Should the CT wires be twisted or untwisted or does it matter?Any suggestions on a housing so I can mount the panel meter to a wall?Are there any pannel meters with larger displays?Thankshttps://www.amazon.com/dp/B0B3WVG2V9?psc=1&ref=ppx_yo2ov_dt_b_product_details

author: EEVblog
author_rank: Unknown
timestamp: June 13, 2023, 06:02:09 am
content: Almost certainly yes. As per other thread, I use a 20m CAT5 cable from the CT in my fuse box to my Zappi charger. No problems.CT's are a very low impedance current source, so external interference is very hard to do.Might be different if you have a voltage output CT.

author: rvalente
author_rank: Frequent Contributor
timestamp: June 13, 2023, 10:26:18 am
content: I see no problems at all, it is common to have CTs and PTs wiring coming from the transformers to the meters in substations

author: DougSpindler
author_rank: Super Contributor
timestamp: June 13, 2023, 03:08:02 pm
content: Thanks

author: Martin72
author_rank: Super Contributor
timestamp: June 13, 2023, 09:22:19 pm
content: Hi,QuoteWhat calibration..?Length is no problem, in our converter/inverter units the wires to the current transformer could exceed easily 3 meters or more.It´s like Dave already said, the current transformers output is a current that is flowing through the wires until it will be converted into a voltage inside the powermeter via a internal shunt resistor.So the length is not a problem.QuoteNormally not, except the wires are lying directly beneath (switched)power leads.QuoteAccording to your link the power meter got a snap-in housing.Just buy a slightly bigger housing and cut a suitable hole in it, make two drill holes on the bottom to screw it on the wall before "snap-in" the power meter.
SIGLENT SDM-3055 Multimeter - Page 1
Forum section: electronics / testgear

author: samson
author_rank: Contributor
timestamp: May 25, 2023, 12:18:46 pm
content: Hi, I have the Siglent SDM3055 Multimeter with the latest firmware. Version： V1.01.01.27R2The problem is when you press TEMP all is working, as soon as you press CUSTOM SENSOR the meter hangs and you have to restart the meter.Could anyone explain what is going on and is this normal. Is there something I am missing. What does Custom sensor do?Thanks

author: danielg
author_rank: Contributor
timestamp: June 12, 2023, 10:38:59 pm
content: Quote from: samson on May 25, 2023, 12:18:46 pmHello samsonI have same problem and more, maybe you want to read my post on other threadhttps://www.eevblog.com/forum/testgear/siglent-new-bench-dmm-sdm3055/msg4902257/#msg4902257Replay 1330 and 1340 May 30 and 10 Junie 2023Please inform me If you find any solutionsbr Daniel

author: dibro
author_rank: Contributor
timestamp: June 13, 2023, 10:12:18 am
content: Just tested it after installing the same FW.When I selected I noticed some memory key access and then I could go on.My 3055 didn't hang. Can it be that it times out on a missing memory key?

author: bidrohini1
author_rank: Contributor
timestamp: June 13, 2023, 11:13:36 am
content: This manual has some general troubleshooting guidelines:https://int.siglent.com/upload_file/user/SDM3055/SDM3055_UserManual_UM06035-E02A.pdfYou can check if it helps.
Fluke 115 Holster / Tilt Stand - Page 1
Forum section: electronics / testgear

author: David_AVD
author_rank: Super Contributor
timestamp: June 13, 2023, 05:40:02 am
content: I have a couple of Fluke 115 meters that I'd like to get new holsters (right name? the soft molded add-on case) for. One also has a broken tilt stand piece.I'm not talking about the loose soft / hard cases used for transport. Just the molded one that grips around the meter.Surely these are items that are available as spare parts, but I can't seem to find them online. My Google skills seem to be poor today!

author: mwb1100
author_rank: Frequent Contributor
timestamp: June 13, 2023, 08:52:31 am
content: Some eBay hits - not sure what the shipping to Australia would be:-Fluke 115 Holster-Fluke 115 stand(3D printed - not OEM)You might want to try calling Fluke and asking. The115's "Calibration Information" manualhas a parts listing at the end that you can get the part number from (there are 2 variants of the Holster and Tilt Stand). It also has various phone numbers for Fluke at the beginning.

author: David_AVD
author_rank: Super Contributor
timestamp: June 13, 2023, 09:45:36 am
content: OK, from those listings it appears what I really need is just the stand part.I might see if someone has a 3D file for it and get a friend to make it. Thanks.
B&K Precision 8550 - Page 1
Forum section: electronics / testgear

author: deepfryed
author_rank: Unknown
timestamp: June 13, 2023, 08:30:28 am
content: Has anyone acquired or taken a look at B&K Precision's new 8550 Electronic Load ?Looks like an entry level / general purpose programmable load that's a tad cheaper than their 8600 series.https://www.tequipment.net/BK/8550/Electronic-Loads/

author: luudee
author_rank: Frequent Contributor
timestamp: June 13, 2023, 08:38:14 am
content: No, have not played with that one.I have a ITECH 8513C+, and am very happy with it.Here is a small showcase of what ITECH offers:https://www.tequipment.net/BK/8550/Electronic-Loads/I bought mine off AliExpress, much cheaper, lolCheers,luudee

author: deepfryed
author_rank: Unknown
timestamp: June 13, 2023, 08:45:29 am
content: Not sure how much I can trust sellers on AliExpress. How much cheaper was it ?
So what did I buy? Is it worth refurbishing? (ans'd) - Page 1
Forum section: electronics / testgear

author: metertech58761
author_rank: Frequent Contributor
timestamp: June 14, 2023, 01:39:17 am
content: So I was at a collectors' show this past weekend and this oddball piece of equipment caught my eye and the price was reasonable enough I decided to pick it up for giggles.Western Progress Installer's Test Set, p/n 8000 - searching turned up nothing except for other units that are or had been on Ebay.Is it something that could be used as a general-purpose instrument or is it too 'niche' to be of any use?It uses three batteries - Eveready 246 (big square 9-volt battery) and 2x Eveready 412 (22.5V alkaline).The wire gland holding the three leads was broken so I temporarily removed the leads (red / yel / grn, each ending in a telcom clip).If it's worth refurbishing, I would want to know where I can source fresh test lead wire (each is 4' or so), switch boots, and ideas for dealing with the remnant of the enclosure that folded over the front.Alternatively, if anyone is after a 'parts unit', I'd be willing to let this go for a reasonable price (I don't have that much into this).

author: cruff
author_rank: Regular Contributor
timestamp: June 15, 2023, 12:25:07 pm
content: Looks like a telephone installer test set for land lines.

author: xrunner
author_rank: Super Contributor
timestamp: June 15, 2023, 12:32:50 pm
content: Quote from: metertech58761 on June 14, 2023, 01:39:17 amNot in my mind.Is it worth restoring? Depends on your goals and interests. It's neat in that it represents a long-gone era of technology but other than that I don't see any use for it in today's world. However; for a museum piece or personal collectors piece to show off, if restored, would be nice.

author: metertech58761
author_rank: Frequent Contributor
timestamp: June 15, 2023, 07:50:39 pm
content: I figured it was likely phone related. Much appreciated!Follow-on edit: It turned out the detent on the main selector switch was broken, which probably explains why it was retired to begin with.At the same time, I have a lineman's phone that happens to need a new pair of telecom clips.As I need to be downsizing anyway, I'll repair the butt set and part out this piece of equipment (thankfully it was only $10).
Anyone with a Batronix discount code? - Page 1
Forum section: electronics / testgear

author: bytestorm
author_rank: Regular Contributor
timestamp: February 10, 2017, 10:43:40 pm
content: Wanna buy a new oscilloscope and thought Id ask before. please send me a pm if you have any.Thanks!

author: pizzigri
author_rank: Regular Contributor
timestamp: June 12, 2023, 11:36:58 pm
content: Well, I’ll try to resuscitate this thread! Just like the OP said, and si ce we have other esteemed official resellers in other regions already offering EEV members some discount and coupons, why not in EU? And especially Batronix which undoubtedly is a pillar of the Siglent brand? I am in the market for a SDS 2104x plus, and could sure use a good help ....

author: H.O
author_rank: Frequent Contributor
timestamp: June 13, 2023, 04:50:05 am
content: Ask them for a quote.IME they'll come back with 4-5% knocked off the list price, probably more if you step up in the product ranges. If you're not happy with that you can try pushing them and/or play them out against Batterfly.

author: pizzigri
author_rank: Regular Contributor
timestamp: June 13, 2023, 06:35:57 am
content: Hey HO, yeah! That is great advice. In any case, if anybody happens to have a coupon or code, it would be great to have it via PM!
Accidently removed the firmware in Tektronix TDS 350, can it be loaded back? - Page 1
Forum section: electronics / testgear

author: deviantlogic
author_rank: Newbie
timestamp: June 12, 2023, 11:18:10 am
content: Hi everyone,First post here in this forum. (been reading for years obv).Anyway, I really fucked up today. I recently bought a perfect condition Tektronix TDS 350 oscilloscope, and today while i was just poking around in the scope menus i accidentally removed the whole front panel software by clicking on "OK Erase Setup & Ref Memory"reference from the manual here on page 99:http://ecelabs.njit.edu/student_resources/tds320.pdf?fbclid=IwAR0IH8HTQbrhA_knptBkp25q1BKkoc0FNBehWnyATqBS47JsphjQYKT9sYYNow the scope is essentially just acting like a bad version of a analog oscilloscope, i can see waveforms when sending signals into CH 1 and CH 2 but ALL menus are gone, cant access anything.I need help guys, anyone experienced in reloading the firmware into these scopes? Or should i just give up on this and just buy a new scope and NEVER do this again.ThanksEDIT EDIT EDIT: I solved the problem. By removing a user setup the scope reverted to a setting where the display intensity and contrast was set to 0% somehow. Puh!!! the scope is still alive.
Heathkit AD-1013 Audio Oscilloscope Assembly Manual PDF - Page 1
Forum section: electronics / testgear

author: cincin
author_rank: Regular Contributor
timestamp: June 09, 2023, 09:53:56 pm
content: Couldn't find a copy online and had access to a rare hard copy, so I've scanned the Heathkit AD-1013 Quadraphonic Audio Oscilloscope Assembly Manual for posterity.Nice hand-drawn "center-fold" style diagrams and schematics!I sent it to ManualsLib, but here it is as well so it can be found:Heathkit AD-1013 Audio Scope Assembly ManualAnywhere else I should post it so it can easily be found?
Rigol MSO5074 locking up - Page 1
Forum section: electronics / testgear

author: jerryk
author_rank: Regular Contributor
timestamp: June 09, 2023, 06:45:16 pm
content: I have had a couple of events where my Rigol MSO5074 screen just locks up. Reboot seems to fix it. When I turn it on it beeps three times during the boot sequence which is something I haven't noticed before. Another observation is that it seems to run warm both in the unit and in the decoder cable attachment. I have attached an image of the temperature at the decoder cable. Are these observations normal?Jerry

author: thm_w
author_rank: Super Contributor
timestamp: June 09, 2023, 11:01:13 pm
content: Temperature is normal. Although you could try pointing a fan at it and seeing if it reduces the screen lockup.Anything you are specifically doing when it froze?Firmware is reasonably up to date I assume?https://www.eevblog.com/forum/testgear/hacking-the-rigol-mso5000-series-oscilloscopes/msg4398940/#msg4398940https://www.eevblog.com/forum/blog/new-rigol-scope/msg2552004/#msg2552004

author: jerryk
author_rank: Regular Contributor
timestamp: June 10, 2023, 12:26:36 am
content: The first event I was measuring the flyback from a starter solenoid. It's something I have done before without issues. It actually put the screen in a confused state. Reboot brought it back to normal. I was concerned that I may have done something extraordinary and have not tried it since. The most recent event was measuring a square wave output from an 8 bit pic microcontroller. In both cases the power was from a DC lab power supply. The thing that did catch my attention the most was the heat in the end of the LA cable. That seemed odd. I don't know enough about how that cable functions. I'll check the firmware currency.Thanks - Jerry
Hantek 1062B Removing PCB from Housing and a DMM Function Problem Question - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: June 09, 2023, 09:16:29 pm
content: I have a Hantek 1062B where the scope functions work properly but none of the DMM functions work. The buttons do not display the correct range (although I can hear relays click) and when the DMM function is selected the meter says it in in DC Volts but the meter reads 0.00 constantly when any voltage is applied. All of the fuses are perfectly okay and nothing in the top side of the PCB appears to have any damage.I did reload the firmware thinking that I had a firmware problem but that did not change anything, the DMM function still does not work. The instrument does pass all of the built in tests and self calibration but I suspect this is related to the oscilloscope functionality and not the DMM.I would like to investigate this further but I can not figure out how to remove the PCB from the case after removing all of the PCB mounting screws I can see. It could be that there may be some screws under the metal covers but I did not want to bend those tabs unless I have too.So has anyone removed this board that can tell me how to do it?Any hints on the DMM problem?Anyone have any schematics?Does Hantek have a USA service center?I bought this scope at a hamfest for $40.00 so just as a scope that is quite a bargain but it would be nice to get the DMM working. I had one of these scopes a while back and sold it and have regretted selling it ever since.Thanks for your help.SamW3OHM
GM328A - White screen - Page 1
Forum section: electronics / testgear

author: UltimateX
author_rank: Contributor
timestamp: June 08, 2023, 10:07:48 pm
content: Hi,I have a GM328A that has been languishing in a drawer awaiting repair for about two years that I have only just had time to get round to this week. It initially worked fine but began to fail now and again by displaying a white screen momentarily as the encoder was pressed to start it up. Now that's all it does when the encoder is pressed. I reflowed the solder on the TFT screen's pins as well as the socket into which it plugs on the main board, which made no difference. I also flexed and tapped just about everywhere to see if I could get it to come to life again, but no joy. However, during very warm weather (over 30°C) last year I thought I would try it and it worked, once, then died again. Whether this was coincidence or the increased ambient room temperature I am not sure. I have just taken it apart now and checked all the resistances of the resistors and they all measure according to their PCB stated values. Looking at the soldering of the various components under a fairly high strength magnifying eyepiece I see nothing suspect. I know this is not a unquestionable proof there are no dry joints, but I would like to avoid a full reflow of the board if I can. I removed the ATMega328P to see what happens when the chip is removed, but the fault is the same. Would this happen anyway as the chip is not installed, or is it a clue to the stage the fault must exist in?So that I can understand the stage at which the fault is likely to be, is anyone able to briefly describe the procedure the GM328A follows as it powers up and engages the ATMega328?Thanks!Ad

author: indman
author_rank: Super Contributor
timestamp: June 09, 2023, 06:25:48 am
content: For questions about these devices, there is a global topic in which you will be answered and helped. There is no need to create duplicate topics.https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/8625/

author: UltimateX
author_rank: Contributor
timestamp: June 09, 2023, 11:12:02 am
content: Okay, understood, thank you.I tried to remove this post but the board advises I cannot remove my own posts.

author: coromonadalix
author_rank: Super Contributor
timestamp: June 09, 2023, 11:38:41 am
content: You can remove some of your posts following the OP 1st thread discution(s)But not the 1st one you created when starting a topic / discution like you did
HP 8590A SA: Requesting opinions - Page 1
Forum section: electronics / testgear

author: BillyO
author_rank: Super Contributor
timestamp: June 07, 2023, 01:59:49 am
content: Are these decent instruments?I can get one tested and working with option 021 (HPIB) for $400 USD. Is it worth that much?

author: ps
author_rank: Regular Contributor
timestamp: June 07, 2023, 06:41:23 pm
content: Better get yourself an 8591A. Its time base is linked to a crystal oscillator (or an external 10 MHz reference). The center frequency of the 8590A drifts, it comes from an analog VCO.

author: BillyO
author_rank: Super Contributor
timestamp: June 09, 2023, 02:29:51 am
content: Thanks.I wonder if it could be converted.Update:From the service manual:"The First Local Oscillator Assembly is a yttrium-iron-garnet (YIG) tuned oscillator (YTO). The YIG, a ferro-magnetic material, is polished into a small sphere precisely oriented in a magnetic field. Changes in this magnetic field alter the frequency of the signal generated by the YTO. Voltage control of the magnetic field surrounding the YIG sphere allows the analyzer to be swept or tuned within the frequency range of 2.05 to 3.55 GHz used in the first LO."So I'm guessing a mod for a 10MHz reference input would not be possible. Pretty cool technology though!
Audio Precision SYS-2722 Service Manual - Page 1
Forum section: electronics / testgear

author: Evan.Cornell
author_rank: Regular Contributor
timestamp: April 06, 2018, 02:03:11 pm
content: Does anyone have Audio Precision SYS-2722 Service Manual available?

author: jipihorn
author_rank: Contributor
timestamp: April 17, 2020, 08:22:01 am
content: Hello,Even though there is a document named "service manual" for the system two range of analyzers, there is nothing available that is useful for repairing.I have this manual and it only contains the calibration and adjustment procedures. Don't be fooled by the drawings - they don't show anything. And it is difficult to get and expensive.Perhaps the end of the AP2700 series (and previous ones a long time ago) would let AP to publish actual service manuals (like for the system one devices), but I'm not very hopeful...Jerome.

author: Evan.Cornell
author_rank: Regular Contributor
timestamp: April 17, 2020, 12:22:12 pm
content: I no longer have access to the SYS-2722 anyway.. great piece of equipment though!

author: hoangduongo
author_rank: Newbie
timestamp: July 21, 2021, 06:27:25 pm
content: Hi Jerome,Is there anyway you can share a copy of this manual with me? I have a 2222A that needs some post-repair adjustments and AP is not willing to help.Many thanks,Duong

author: Evan.Cornell
author_rank: Regular Contributor
timestamp: June 08, 2023, 02:48:37 pm
content: After a couple years, just checking if anyone has SYS-2722 from Audio Precision service manuals.. AP has really seriously stopped support for this model. A unit I have just started giving connection errors:Incident code 66646 on startupError 8501: undefined DSP errorError 8611: an error has occurred, probably APIB

author: danils
author_rank: Contributor
timestamp: June 08, 2023, 05:04:51 pm
content: AFAIK Ap did not release the service manual for sys-two after IP was stolen by competitors via the sys-one service manual that was available to the public.When my SYS-2322 got broken I had to reverse engineer part of the board and thankfully it was just an op-amp to be replaced.If something containing a software (a CPLD) got broken in your device, you are basically screwed. On the auction site there are spare boards for sale. Think about that.There was a old AP box group on linkedin but I am not able to find it anymore. There is an ex AP employee checking the forum. Maybe he will step in. I know he offers repair service for the discontinued models.
Spellman Power Supply Repair - Page 1
Forum section: electronics / testgear

author: EggertEnjoyer123
author_rank: Frequent Contributor
timestamp: June 07, 2023, 04:47:32 am
content: I have a 60kV 80mA Spellman high voltage power supply that I would like to get working again. The issue is that it is missing the front panel with all the controls. All the other power components test fine with my multimeter.Does anyone have any ideas for how to get it working? It seems like there is an interface for hooking it up to a computer.
A couple of Tektronix manuals are on TradeMe - Page 1
Forum section: electronics / testgear

author: apelly
author_rank: Unknown
timestamp: June 06, 2023, 11:53:46 pm
content: Not my listing, but helping these babies go to a good home can't be a bad thing, can it?https://www.trademe.co.nz/a/marketplace/electronics-photography/other-electronics/other/listing/4166549637?bof=q29gOhZOFor those unfamiliar, TradeMe is the ebay of New Zealand.
6 channel scope on the cheap side - Page 1
Forum section: electronics / testgear

author: luis garcia
author_rank: Regular Contributor
timestamp: June 06, 2023, 06:07:05 pm
content: Is there any scope with 6 analog channels not so expensive ? I already know there are several top line scopes with 6 and 8 channels. But these are too expensive!I would need all channles on the same scope in real time, and not, I cannot use digital channels. I do not care if it is desktop or PC based.I remember of some old scope from Tek the TLS216, 16 channels, that can still be found on eBay, but it had many limitations.Does anyone knows about any scope with these characteristics ?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: June 06, 2023, 06:19:19 pm
content: What bandwidth ?Picoscope do 8 channels at 20MHz for under £2Khttps://www.picotech.com/oscilloscope/4000/picoscope-4000-series

author: bdunham7
author_rank: Super Contributor
timestamp: June 06, 2023, 06:48:13 pm
content: Quote from: luis garcia on June 06, 2023, 06:07:05 pmYokogawa made a number of 8-channel scopes, some of the older ones could be had pretty reasonably at this point. Make sure you know what you're getting, some of them have modular inputs and may not have all of the channels actually installed. These also can be isolated inputs, which is pretty extraordinary, but I have yet to see one for sale with all 8 isolated inputs installed.Otherwise, Picoscope is probably the way to go if you can't afford a Tek MSO68B-series.

author: nctnico
author_rank: Super Contributor
timestamp: June 06, 2023, 09:34:06 pm
content: Yokogawa DL708 and DL716 are such multi-channel beasts but the bandwidth is a few MHz at most. These have a wide variety of acquisition modules though like isolated 12 bit input modules. Very handy to measure across current shunts somewhere in a circuit.

author: Martin72
author_rank: Super Contributor
timestamp: June 06, 2023, 09:41:39 pm
content: We have the 16-channel scope from them, a heavy weight champion..We´ve used it for a static transfer switch to test - 3-phase source 1, 3-phase source 2, currents source 1 and 2, finally 2 trigger signals from the control electronic, so only 2 channels were left.All channel inputs are modular slot-in, the 6 channels for the voltages have the high-voltage isolated modules.