hybridfree/eevblog-posts huggingface dataset:
Seeking scope/probes recommendations - Page 1
Forum section: electronics / testgear

author: analog8484
author_rank: Contributor
timestamp: May 23, 2023, 07:56:43 pm
content: Can anyone recommend the least expensive 4-channel scope/probe sets that can provide accurate/reliable real-time analysis of IGBT/MOSFET switching/conduction losses for switching frequency up to 30KHz with AC mains voltages and current up to 30Arms?Any help would be appreciated.

author: wasedadoc
author_rank: Super Contributor
timestamp: May 23, 2023, 08:05:45 pm
content: Is this analysis to be done in situ on a prototype equipment design that will be handling AC mains? Or do you want to characterise the devices when switching the voltage levels and currents you mention?

author: analog8484
author_rank: Contributor
timestamp: May 24, 2023, 07:15:42 pm
content: It's for a live dev system.

author: tautech
author_rank: Super Contributor
timestamp: May 24, 2023, 09:01:17 pm
content: Siglent offer such for their 2000X HD series however not cheap and it includes PA license which of course is useless if you don't have one of these models.https://siglentna.com/product/power-bundle-1-5-kv/

author: analog8484
author_rank: Contributor
timestamp: May 25, 2023, 03:59:00 pm
content: Thanks. At least it's a reference point.

author: tautech
author_rank: Super Contributor
timestamp: May 25, 2023, 08:18:37 pm
content: Quote from: analog8484 on May 25, 2023, 03:59:00 pmBut not much of one as it covers nearly bases for PA which is probably far more than than normal needs.Are you starting from a clean sheet and need all of the above package ?What exactly would be your requirements ?

author: analog8484
author_rank: Contributor
timestamp: May 26, 2023, 06:09:31 pm
content: Quote from: tautech on May 25, 2023, 08:18:37 pmDon't need everything in the package. The main requirement is to accurately measure switching and conduction losses in real time to evaluate different driver and IGBT/MOSFET devices/configs in a power converter. So, channel de-skew support is a minimum requirement.
Rigol PVP3250 - Page 1
Forum section: electronics / testgear

author: Crenwick
author_rank: Contributor
timestamp: January 25, 2022, 11:19:13 am
content: Hi all,I have two probes received with my MSO5000 labeled PVP2350On the web I see two different models.MineOtherIs one an old model or ?Regards

author: BRZ.tech
author_rank: Regular Contributor
timestamp: February 19, 2022, 11:12:23 pm
content: Hi Crenwick.I recently purchased an MSO5074. And it came with 4 probes of the model PV2350, as in the photo of [ Attachment Invalid Or Does Not Exist ] .As for the probe in the photo of [ Attachment Invalid Or Does Not Exist ] , I can't say anything useful.

author: CosteC
author_rank: Regular Contributor
timestamp: May 23, 2023, 07:21:25 am
content: I also got version with fancy connector, not boxy one.https://www.eevblog.com/forum/testgear/comparison-of-oscilloscope-probes-pvp2350-vs-pvp3150-vs-lf312-vs-hv150/Can you possibly check your probes/scope?

author: tooki
author_rank: Super Contributor
timestamp: May 27, 2023, 05:01:53 pm
content: Quote from: Crenwick on January 25, 2022, 11:19:13 amIf you look at the second picture, you can see its model number is clearly NOT PVP3250.The second photo is RP3300A, a totally different model.
HP 53131A Non-USA Serial Number Cross Reference - Page 1
Forum section: electronics / testgear

author: David D
author_rank: Contributor
timestamp: May 23, 2023, 06:10:29 pm
content: I just purchased an HP 53131A counter that was made in the Korean HP facility. I'm looking for the correct manuals for it online, but everything I have found references the USA serial numbers. The prefix on mine isKR9120. How do I determine what year/build of a Korean built unit?

author: alm
author_rank: Super Contributor
timestamp: May 23, 2023, 07:09:13 pm
content: Quote from: David D on May 23, 2023, 06:10:29 pmIf the manuals reference PCB revisions, then check the markings on the PCBs. Otherwise semiconductor date codes should give you a hint of when it was manufactured. As far as I'm aware, different production regions use independent serial number sequences, so unless someone compiled a list of serial numbers for this particular units, or you find a manual for your Korean serial number, I think you'll have to do your own research. You could also look at the backdating section. For example the assembly level repair manual says that for serial number ranges 3705A-3710A to 3711 the motherboard was updated from 53132-60001 to 53132-60014. So if you find motherboard -60001, you're unit will likely correspond to US serial ranges 3705A-3710A.

author: luis garcia
author_rank: Regular Contributor
timestamp: May 23, 2023, 08:06:22 pm
content: David, where are you looking for the manuals?

author: David D
author_rank: Contributor
timestamp: May 23, 2023, 08:23:41 pm
content: Quote from: alm on May 23, 2023, 07:09:13 pmGood idea! Thank you for that!Quote from: luis garcia on May 23, 2023, 08:06:22 pmI've looked at several sites, including Keysight/Agilent.

author: David D
author_rank: Contributor
timestamp: May 26, 2023, 05:56:44 pm
content: Opened it up and it's got a 53131-68004 motherboard. The motherboard actually says "Made in USA of Domestic and Foreign components. Since this says "Made in Korea" and has a Korean s/n, I guess it was just assembled in Korea, or some replaced the motherboard at some point? The firmware rev is 3703.
IFR AEROFLEX 2975 Service manual looking - Page 1
Forum section: electronics / testgear

author: Gian2975
author_rank: Contributor
timestamp: May 19, 2019, 07:27:55 pm
content: Hi to all,I looking service manual for ifr Aeroflex 2975.Unfortunately it is no longer available from the assistance and I cannot find it.Any help would be appreciatedmy email is : iw2nxe@gmail.comThank youGianfranco

author: tautech
author_rank: Super Contributor
timestamp: May 19, 2019, 07:43:01 pm
content: Maybe contact these guys:https://aeroflex.viavisolutions.com/service-and-support/maintenance-and-calibration-programs

author: BH3TXW
author_rank: Contributor
timestamp: January 28, 2022, 12:40:41 pm
content: Hi, this is James BH3TXW, I have that, do you still need it?

author: ve2vxt
author_rank: Newbie
timestamp: March 13, 2023, 02:58:26 pm
content: Hi James, do you still have the IFR2975 service manual?Is it possible to have a copy of it?Thank you.Eric

author: picburner
author_rank: Frequent Contributor
timestamp: March 14, 2023, 09:32:29 am
content: You can find the service manual on theko4bbwebsite. There are both the Marconi and the IFR version. Search for "2975"

author: namhoang111111
author_rank: Newbie
timestamp: May 25, 2023, 03:19:09 am
content: Hello,I have a IFR2975 with a failed HDD. Anyone has made a backup it before? Could you give me one pls!Thank you!
Arduino DUE AWG - Page 1
Forum section: electronics / testgear

author: Grandchuck
author_rank: Super Contributor
timestamp: May 24, 2023, 02:43:50 pm
content: Looking through a drawer, I ran across a DUE controller board and thought I'd see if anything interesting could be done with it. I found a rather useful AWG application and thought that others might have uses for it. Other than a resistor, it requires no additional hardware.https://www.hackster.io/BruceEvans/arduino-due-arbitrary-waveform-generator-a9d180#overview

author: coromonadalix
author_rank: Super Contributor
timestamp: May 24, 2023, 04:16:31 pm
content: ive seen this project .......... the only problem is to have an ouput amplifier ...
Tektronix MDO/MSO: Very slow reading of digital channels - Page 1
Forum section: electronics / testgear

author: luis garcia
author_rank: Regular Contributor
timestamp: May 23, 2023, 07:34:05 pm
content: Hi everybody.I have observed that in my Tektronix MSO/MDO scope, reading digital channels through Visa is about 15 times slower on digital channels than it is on analog channels.It doesnt matter whether I select ascii or binary. (BTW, is there a true binary format?).It is interesting that reading is about 15 times slower, having 16 digital channels. No idea if this is connected to the problem.Of course the deeper the capture the slower ( it can take about 50 seconds to read a digital channel using 10MB depth buffer; using USB2; using Ethernet is slower).I use the command "Curve?" to read the data.My first question is for anyone having experience with Tektronix: is there any plausible reason that could explain why digital channel reading is so slow ?Second question: do you have/had a similar experience using your own Tek scope?Third question, and final: anyone of you using any other brand.. have any experience on this subject ?
ETCR 007AD AC/DC Current Clamp [AC 45Hz-400Hz & DC-100kHz] - Page 1
Forum section: electronics / testgear

author: DaneLaw
author_rank: Frequent Contributor
timestamp: May 23, 2023, 12:54:00 pm
content: I couldn't find an EEVblog-thread for this scope-based current clamp or any feedback, even though it's an older fellow, and curious if anybody had first-hand knowledge with this current clamp for relatively low amps (Max60A) or perhaps tried to optimize it, as it looks to be a very noisy fellow.Specs: ETCR 007AD AC/DC Clamp Leakage Current transducer* Function Measurement of AC/DC current, leakage current*Power Supply Zn-Mn dry battery, 6RL61, 9V. Continually using for 100 hours, connecting external power supply is also available for long time using.*Test Mode Clip-on CT, non-contact measurement*Clamp Size Φ7mm*Input Range 0mA-60.0A AC/DC*Output Voltage 10mV/A;100mV/A(corresponding)*Output Range 1V peak max*Resolution 1mA AC/DC*Accuracy ±3%FS(23℃±5℃, below 5%rh)*Phase Error ≤3°(AC 50Hz/60Hz; 23℃±2℃)*Calibration Adjust ZERO to calibrate, eliminate external electric field interference*Output Wire Core wire: signal positive output; shielding wire: signal ground*Lead length 2m*Dimension LWH: 168mm×65mm×34mm*Frequency AC: 45Hz-400Hz DC: DC-100kHz*Test Position Tested wire in the jaw center*Line Voltage AC600V*Weight 170g (Including the battery)*Working Current 5mA*Working Temperature and Humidity -10℃-50℃,below 80%rh*Limit Temperature Error -10℃-0℃ and 40℃-50℃, within 2%rdg*Storage Temperature and Humidity -10℃-60℃,below 70%rh*Insulating Strength AC3700V/rms (between the alloy of the clamp and the housing)*Applicable safety rules IEC1010-1, IEC1010-2-032, Pollution level 2, CAT Ⅲ(600V)*Accessories Sensor: 1piece; Battery(6F22,9V): 1piece; User Manual/Warranty card/ Certification.Internals:(A shutload of unpopulated pads)Any user feedback on these ETCR-007AD AC/DC (DC100KHz) current clamps.?They were around 50US back in 2019/2020, so a tad more expensive than other budget-orientated AC&DC BNC-based current clamps for scopes, like fx Hantek CC-65 (DC 20KHz).Here in 2023 - it looks like US sources like Newegg & Amazon are selling them for 3x to 3.5x their inner-price a few years back.https://www.newegg.com/p/2S7-07JP-2BCA2?item=9SIB33YJF64204&https://www.amazon.com/ETCR-007AD-Leakage-Current-transducer/dp/B017YGOWQKManual http://file.yizimg.com/492225/2016112-16458399.pdf[007AD Page+4]Vendorhttps://www.etcrmeter.com/etcr007ad-ac-dc-clamp-current-sensor-50a_p160.html//https://www.etcr-instruments.com/index.php/qxjzldlhgqjddzcsyjydzcsyzldzcsyqxdlbgdyqxdlbgyydqd/1982.html
UNI-T UT139S hangs/delay after each button pressed or mode changed / power on - Page 1
Forum section: electronics / testgear

author: BigMaxTs
author_rank: Newbie
timestamp: May 22, 2023, 01:37:20 pm
content: Hi,I own a UT139S for a year and mostly use it at home. Last time I took it to measure something I found it makes a delay after every button I press of mode change or power on. The delay is around -+11 seconds every time.Teared it down and nothing looks suspicious to be honest. Replaced batteries and probes - same story.Made a video to demonstrate this problem:https://youtu.be/iIac8be_YOEAny help or advice would be highly appreciated.Thanks.

author: indman
author_rank: Super Contributor
timestamp: May 23, 2023, 09:15:09 am
content: Cheсk and replace resonator quartz.
Sunhayato thru hole test leads - Page 1
Forum section: electronics / testgear

author: dorkshoei
author_rank: Frequent Contributor
timestamp: January 12, 2022, 03:26:14 pm
content: Has anyone used these? All my searches lead to them being only available in Japan which strikes me as odd.Are there any similar products more commonly available?https://www.sunhayato.co.jp/material2/ucb12/item_1180https://www.sunhayato.co.jp/material2/ucb12/item_548Hard to tell from the links what they do, see attached image.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: January 12, 2022, 11:12:45 pm
content: Let us know what you find out. Looks interesting!

author: tkamiya
author_rank: Super Contributor
timestamp: January 22, 2022, 08:46:32 am
content: There is a list of distributors outside of Japan:https://www.sunhayato.co.jp/dcms_media/other/SHC_agency_overseas.pdfPurpose of these leads are to insert it into through hole PCB and stay. It doesn't test the through hole itself. Very interesting...

author: dorkshoei
author_rank: Frequent Contributor
timestamp: April 26, 2023, 05:31:07 pm
content: QuoteUnfortunately none of these stock the item. There is no USA distribution.I bought some extras. I posted a link in the "Buy/Sell/Wanted" forum if anyone is interested.https://www.eevblog.com/forum/buysellwanted/fs-(usa)-sunhayato-thru-hole-test-leads/

author: TERRA Operative
author_rank: Super Contributor
timestamp: May 23, 2023, 01:50:06 am
content: I can get these in Akihabara and post them for pretty cheap in an envelope if anyone needs some.Test Wire for Through Hole (Male to Male) (TTW-200)Test Wire (Female-Male) (TTW-201)Test Wire (Female-Female) (TTW-202)Test Wire (Male/Breadboard - Male/Spring Pin) (TTW-203)

author: srb1954
author_rank: Super Contributor
timestamp: May 23, 2023, 05:43:57 am
content: Quote from: dorkshoei on January 12, 2022, 03:26:14 pmOr you could consider making some up yourself using loose contacts of a "board-in" connector e.g. Molex 50034 series contacts.

author: pope
author_rank: Frequent Contributor
timestamp: May 23, 2023, 07:57:24 am
content: These look cool
Tek DPO4000 / MSO4000 console port pinout? - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: September 28, 2018, 11:30:02 am
content: Hi,Does anyone happen to have the pinout for the console port on a Tek DPO4000 / MSO4000? I believe that it's J501.https://www.eevblog.com/forum/repair/tektronix-dpo4054-stucked-at-tektronix-splash-screen/I've PM'd him, but so far no reply...This DPO4034 doesn't even get the splash screen. Code appears to be executing from the boot flash. All internal voltages are good.Thanks!

author: analogRF
author_rank: Super Contributor
timestamp: November 05, 2019, 02:55:50 pm
content: Did you find out where the serial console port is located?I have a similar issue with a DPO4054

author: Jwalling
author_rank: Unknown
timestamp: November 05, 2019, 04:13:57 pm
content: Quote from: analogRF on November 05, 2019, 02:55:50 pmNever heard back, I ended up selling it for parts.Still would love to find out, though...

author: pcwrangler
author_rank: Regular Contributor
timestamp: February 11, 2021, 06:43:03 pm
content: Sorry for reviving this old thread but it was never officially answered and I wanted future users to have less of a headache finding the answer. This is the most straight-forward thread on the subject.Answer provided by ApertureScience in threadhttps://www.eevblog.com/forum/repair/tektronix-dpo4054-stucked-at-tektronix-splash-screen/25/Quote from: ApertureScience on February 10, 2021, 01:28:07 pmI confirmed this worked on my MSO4104.

author: martinr33
author_rank: Frequent Contributor
timestamp: May 23, 2023, 02:45:21 am
content: This post also contains an image of the connector, and documents ground as the third pin.https://www.eevblog.com/forum/repair/tektronix-dpo4054-stucked-at-tektronix-splash-screen/msg3916490/#msg3916490
Question About Peak Atlas ESR70 Measurements - Page 1
Forum section: electronics / testgear

author: TimeBandit
author_rank: Regular Contributor
timestamp: May 23, 2023, 01:16:14 am
content: I've noticed that if I test a capacitor several times in a row with the Peak Atlas ESR70, the ESR value will change (sometimes significantly) from one reading to the next. Any idea why this would be?
Which nanoVNA confused about which one is genuine - Page 1
Forum section: electronics / testgear

author: suspension
author_rank: Regular Contributor
timestamp: December 30, 2022, 06:49:24 am
content: I am thinking of buying a VNA for hobby use. I can see that there are multiple options such as liteVNA, nanoVNA, libreVNA. My budget is limited so would like to settle with a nanoVNA.There seem to be two websites claiming the ownership of nanoVNA,https://nanovna.com/andhttps://nanorfe.com/nanovna-v2.html. Which one sells the genuine one?ThanksSus

author: jasonRF
author_rank: Regular Contributor
timestamp: January 02, 2023, 10:56:56 pm
content: Quote from: suspension on December 30, 2022, 06:49:24 amI think you need to read those web sites more carefully. The nanovna2 FAQ says that it is a completely different design than the original nanovna. These are two different products with different specs and a different heritage.I am only personally familiar with the original nanovna, which satisfies my needs and works quite well. We have a few at work to use as 'emergency backups' if a FieldFox dies when doing field work, and I also have one I bought for myself. If you get one you should buy from the vendors that their site recommends to make sure you don't get a fake. I don't know anything about the nanovna2.jason

author: MathWizard
author_rank: Super Contributor
timestamp: May 24, 2023, 10:23:35 pm
content: I would also like to get a VNA, and there's lots of clones, of all prices. I found the Tindie store and see the $300 NanoVNA V2 Plus4, it says it's good up to 4.4GHz. The original was closer to 900MHz or 1.6GHz.I have FFT on my scope, so I'm not in a rush to get something like a Siglent spectrum analyzer SSA3021X plus, that can be upgraded or hacked to include the VNA functions, if I read that right. But then again I was going to upgrade my sds1204X-E scope, for about the same price. I don't really have to do that, but I don't really really need a real SA or VNA yet, it would collect dust most of the time. I guess I'd have to buy a bunch of over priced accessories too.Any other good options to consider, or is the NanoVNA V2 Plus4 good enough for most stuff under 1GHz ? It does better than 1st nanoVNA, under 1GHz too. Anything similar in price/performance but in a benchtop model with a bigger screen ? It seems the NanoVNA V2 Plus4 comes with the basic adapters/cables, so thats nice.
Symmetricom XLi : No GPS - Page 1
Forum section: electronics / testgear

author: comsec22
author_rank: Contributor
timestamp: May 22, 2023, 08:02:14 pm
content: In my unit (1510-652) the GPS boars is not recognize by F118 Option Board Configuration menu.Few led on the gps is flashing.. except D1 (always off).In the main display, time counting is not starting, seems like there is not a reference clock..I am also wondering why, the only communications is by serial port but not on the ethernet port.. really odd behavior.Any idea about the internal P2 coax plug ?Any support is really appreciate..

author: comsec22
author_rank: Contributor
timestamp: May 23, 2023, 12:32:00 am
content: Trying to remove Furuno's receiver, the GPS module become to be available from processor board. Re assembling, now SV will be recieve.Position is correct, but no way to get right time and date.I also discover, that ebay's seller, has remove one board.. the one between the rubidium and the mother board.Any diagrams to duplicate ?73's IU0CIX
Elnec Dataman based programmers Adapters pinout - Page 1
Forum section: electronics / testgear

author: coromonadalix
author_rank: Super Contributor
timestamp: May 22, 2023, 05:34:39 pm
content: hi Posted at a few places here about having some documentations ....I was contacted a few times abot them just found them lollMy programmer and What they call ODM partners (resold under other brand names)BeeProg+Dataman-48Pro+UEP 49+BK 866BMinato MODEL 1882Sorry can't recall EEVblog members posting them here
Fluke 8375A DMM manual - Page 1
Forum section: electronics / testgear

author: munorc
author_rank: Regular Contributor
timestamp: December 27, 2018, 07:55:46 pm
content: Any source for a manual for a Fluke 8375A multimeter? PDF preferred.

author: coromonadalix
author_rank: Super Contributor
timestamp: December 28, 2018, 12:01:55 pm
content: Artekmanuals seems to have it for 10$ usdThey have good scanned copies ....Ebay :https://www.ebay.com/itm/390644723998Maybe this one : serie 3000 (maybe some internal ressemblance ??)http://assets.fluke.com/manuals/8300A___imeng0400.pdf

author: GregDunn
author_rank: Frequent Contributor
timestamp: December 28, 2018, 06:14:29 pm
content: In every instance where I've been able to compare a free manual to an Artek scan, the Artek has been superior - and often containing data missing from the other. I wouldn't hesitate to buy from them.

author: RikV
author_rank: Regular Contributor
timestamp: May 21, 2023, 10:05:07 pm
content: Well, I am also looking for this manual since I acquired 2 pcs of this Fluke8375A.As suggested, I ordered (and paid for) the manual at the menetioned Artek site.They gratefully accepted my payment (for the download version) but since no sign of life. Mails unanswered...Could anyone help me out with a copy?

author: factory
author_rank: Super Contributor
timestamp: May 22, 2023, 07:05:34 pm
content: See here for info on Artek manuals;https://groups.io/g/HP-Agilent-Keysight-equipment/message/133950Dave passed away over Easter and only the ebay store is currently working, mail order CDs only ATM.David
A more convenient function for the Feeltech FY3200 - Page 1
Forum section: electronics / testgear

author: RovDan
author_rank: Newbie
timestamp: May 23, 2023, 03:20:25 pm
content: Hi,I am the owner of the FeelTech FY 3200 Function Generator. It works fine, very fine.However, I found the software built by feeltech a little poor. So, I built my own software with Visual Basic to control the serial communication Port.I found very strange the manual didn't allow to switch on/off each channel by this communication. I found very strange the engineers forgot to implement this basic and useful function. After somme tests, I succeeded to find the right sequence to switch on/on each output. The command is :bg0+LF to switch off the channel 1bg1+LF to switch on the channel 1dg0+LF to switch off the channel 2dg1+LF to switch on the channel 2LF is Line Feed character (ASCII 10)I hope this tip would help everybody who like DIY, like me ...Best regardsDaniel

author: Calambres
author_rank: Frequent Contributor
timestamp: May 23, 2023, 04:09:32 pm
content: Do you perchance know the way to reset the FY3200?Some time ago the "SINE" waveform stopped working. Just that WF, in both channels, just giving a DC offset. I'm pretty sure it is a FW problem because all other WFs work perfectly. I even imported a sine WF from the supplied control software into one of the Arbitrary WF slots and works well. I'm pretty much sure that if I'm able to reset the CPU, not just turning the unit off, the initial SINE wave will come back.Sorry for the offtopic
Enabling Options on Tektronix DPO7000C, DPO/DSA70000B/C and TDS5000B Series - Page 1
Forum section: electronics / testgear

author: calibrationfixture
author_rank: Regular Contributor
timestamp: May 21, 2023, 06:22:07 am
content: Hi,Has anybody succeeded in this? With the DPO7000 and DPO/DSA70000 Series this is no problem. But with the B and C's you didn't get the right Scope Type using validate.py. The same seems the case with the TDS5000B Series. In addition with many TDS5000B Keys you get a CRC Mismatch.Greetings,Calibrationfixture
3458a show "SELF TEST PASSED" but ERR light still on - Page 1
Forum section: electronics / testgear

author: aronake
author_rank: Frequent Contributor
timestamp: May 20, 2023, 04:02:20 pm
content: For a 3458a, if it show "SELF TEST PASSED" and the ERR light is lit up, how should this be interpreted? That the selftest did pass with no errors, but there have been some other error? Or there was an error in the selftest? Is this ERR something to be concerned about?

author: Dr. Frank
author_rank: Super Contributor
timestamp: May 21, 2023, 06:46:13 am
content: if the ERR annunciatior lights up, simply call the ERR? function and read the error code and error text.This way, nobody can't tell, what's the cause of this message.Frank

author: aronake
author_rank: Frequent Contributor
timestamp: May 21, 2023, 09:36:37 am
content: Quote from: Dr. Frank on May 21, 2023, 06:46:13 amAh! Thanks! Yes, that is of course how to deal with this!!
Can you identify this equipment? - Page 1
Forum section: electronics / testgear

author: Renzo83
author_rank: Newbie
timestamp: May 20, 2023, 04:24:45 pm
content: I don't know absolutelly nothing about this thing, other than is branded "Elcomatic".-Thank you.-

author: AVGresponding
author_rank: Super Contributor
timestamp: May 20, 2023, 06:20:13 pm
content: Looks like some sort of amp/pre-amp for a scope or chart recorder

author: TimFox
author_rank: Super Contributor
timestamp: May 20, 2023, 07:21:54 pm
content: "Volts/mm" is more likely for a chart recorder than for a 'scope.An obituary for the founder of Elcomatichttps://www.heraldscotland.com/news/19773126.obituary-jack-jardine-engineer-launched-high-tech-firm-attic-garage/It implies that early products thereof were aimed at chart recorders, since the founder had worked with Honeywell in the US before returning to the UK.Over the years, his company was involved with a wide range of equipment.
brymen 867 vs 869 with teardown pics - Page 1
Forum section: electronics / testgear

author: trent
author_rank: Contributor
timestamp: May 20, 2023, 03:26:17 pm
content: 867 always left to 869. shielding soldered in

author: trent
author_rank: Contributor
timestamp: May 20, 2023, 03:28:11 pm
content: pics

author: trent
author_rank: Contributor
timestamp: May 20, 2023, 03:31:31 pm
content: .

author: trent
author_rank: Contributor
timestamp: May 20, 2023, 03:32:03 pm
content: .

author: trent
author_rank: Contributor
timestamp: May 20, 2023, 03:33:05 pm
content: .

author: trent
author_rank: Contributor
timestamp: May 20, 2023, 03:33:50 pm
content: moderately interesting the 869 is missing some things the 867 has.

author: trent
author_rank: Contributor
timestamp: May 20, 2023, 03:34:29 pm
content: .

author: trent
author_rank: Contributor
timestamp: May 20, 2023, 03:35:06 pm
content: .

author: trent
author_rank: Contributor
timestamp: May 20, 2023, 03:42:06 pm
content: satellite pcb
Alternatives for Peaktech 6226 Power Supply (0-30V/0-10A) - Page 1
Forum section: electronics / testgear

author: Martin72
author_rank: Super Contributor
timestamp: May 19, 2023, 09:06:06 pm
content: Hi,We have more than a dozen of the mentioned power supplies in the company, they are cheap, can provide high current up to 10A and they are built very slim.Whether in the lab or test bay, they are everyone's favorite....We had bought the first ones in 2019/2020 and now some are starting to go crazy:The rotary encoder for the voltage, it is really used umpteen times a day and now seems to be at the end, if you turn slowly (because you want to increase/decrease the voltage slowly), the voltage "jumps" up and down - Very bad for sensitive electronics....New (possibly "better") encoder get and install is out of the question, much too uneconomical.Therefore, the question in the round:Are there alternatives to the Peaktech, but which are better quality, last longer ?10A and 0-30V it should be again, more voltage gladly.May also be more expensive than 120€(cost of the peaktech)...I had already googled a few times, but except the Peaktech as well as umpteen other NoNames nothing found.Gladly just post examples, I do not know when I can implement this, but would fall back on it when the time comes.Thanks in advance!

author: mawyatt
author_rank: Super Contributor
timestamp: May 19, 2023, 11:20:27 pm
content: Korad KWR102, it's a switcher tho but noise level is low for a switcher. Acoustic noise is kinda high at high currents and more expensive ~ $370, build quality seems good and small narrow footprint.Best,
8563EC shorted -15VDC in the 100MHz - Page 1
Forum section: electronics / testgear

author: tchiwam
author_rank: Regular Contributor
timestamp: May 18, 2023, 07:01:49 pm
content: Yup ....And the screen is all garbled too... even if I unplugged that board.GPIB no answerVGA no displayLCD garbled screenThinking about using MLCC instead of the orig Tantalum...I think I hear the RF switches turn on and off at boot time .... But not 100% sure...
Like oscilloscopes, can other pieces of bench test equipment create ground loops - Page 1
Forum section: electronics / testgear

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: May 19, 2023, 12:52:04 am
content: Like oscilloscopes, can other pieces of bench test equipment create ground loops?Like bench-top DMMs, LCR meters, DC power supplies, and load banks?Thanks!

author: tautech
author_rank: Super Contributor
timestamp: May 19, 2023, 01:23:22 am
content: Bench DMM's, no.Otherwise pretty much any instrument with a grounded BNC connector one must be wary how they use it.Some DC supply's need be watched too as outputs are not always isolated.

author: David Hess
author_rank: Super Contributor
timestamp: May 19, 2023, 01:44:57 pm
content: Power supplies usually have floating outputs, but not always.Most other instruments with BNC connectors will create ground loops, but there are some exceptions. For instance some function generators have a galvanically isolated output.

author: jonpaul
author_rank: Super Contributor
timestamp: May 19, 2023, 02:10:52 pm
content: Wrong assumptions, so title makes little sense.Check your def of "ground loops"j

author: David Hess
author_rank: Super Contributor
timestamp: May 19, 2023, 02:51:38 pm
content: Below shows an example of a pulse generator which makes some attempt to minimize ground loops. The shell of the output connector is isolated from the chassis.
Siglent UK - Page 1
Forum section: electronics / testgear

author: gpr
author_rank: Contributor
timestamp: February 26, 2021, 08:30:41 pm
content: Hi. I'm located in UK and going to buy siglent oscilloscope soon, probably 1104X-E. Is there some recommended "authorized" dealer, which will not have problems in case of warranty repairs, etc?I see labtronix, tester, and siglent.co.uk are listed here:https://www.siglenteu.com/how-to-buy/Also,https://www.siglent.eu/also offers oscilloscopes with best prices (after adding 20% VAT), but it is not listed as "authorized" dealer.Any thoughts/recommendations?

author: tautech
author_rank: Super Contributor
timestamp: February 26, 2021, 08:45:45 pm
content: Welcome to the forum.siglent.eu is not siglenteu but JR Special Electronics in the Nertherlands and they are along standing authorized dealer.I'm not aware if any of the UK dealers are authorized service centers so you'll need to inquire with each about that.The UK dealers are: Labtronix, PASS Ltd and Telonic Instruments and all have been appointed and supplied via Siglent's EU branch in Hamburg.

author: bd139
author_rank: Super Contributor
timestamp: February 26, 2021, 10:04:06 pm
content: Telonic are UK and well recommended. I’ve personally bought 5-6 items through them:https://www.telonic.co.uk/

author: nctnico
author_rank: Super Contributor
timestamp: February 26, 2021, 10:16:28 pm
content: Quote from: tautech on February 26, 2021, 08:45:45 pmI wouldn't recommend buying from them. My first & only experience was not good. Sold me a Siglent scope with incomplete / non-functional firmware and wouldn't take it back. Basically telling me to f*** off.They are also selling lots of other brands; basically a box shuffling operation.

author: marcosscriven
author_rank: Contributor
timestamp: May 18, 2023, 03:34:16 pm
content: Quote from: gpr on February 26, 2021, 08:30:41 pmSorry to bring up old thread, but I really do have an identical question.I wondered which supplier (you as the OP) used in the end? The list of suppliers you mentioned doesn't seem to have changed.

author: Sighound36
author_rank: Frequent Contributor
timestamp: May 18, 2023, 04:01:47 pm
content: Speak to Doug @ Telonic, company has been trading for over 40 years personally been dealing with them for over 10 years, infact this afternoon ordered SDG6000X series function genny & some Tekbox RF probes. Has been dispatched for delivery tomorrow First class serviceHave purchased also from Pass Ltd before also a good company.

author: marcosscriven
author_rank: Contributor
timestamp: May 18, 2023, 04:36:40 pm
content: Thanks - I've emailed their info email address. Hopefully Doug gets it.

author: tahinini
author_rank: Newbie
timestamp: May 18, 2023, 09:49:37 pm
content: Telonic is also siglent.co.uk and I’ve been quite pleased with their service when I’ve bought a bunch of stuff lately.
HP 3400 A6 replacement pcb at PCBWay - Page 1
Forum section: electronics / testgear

author: Qmavam
author_rank: Regular Contributor
timestamp: May 21, 2023, 10:53:34 am
content: Just letting you know, a chap has designed a pcb to replace the chopper board, especially helpful when the photo cells have went out of tolerance on your HP3400.https://www.pcbway.com/project/shareproject/HP_3400A_A6_Chopper_Board_Replacement_06465eb7.htmlIf you watch the video, keep in mind that board is REV 1,he got layout errors fixed on REV 1.1!If you watch his linked video on the PCBWay site, have your finger on the FF button, or I suggest you just start at 31:00.Mike

author: TheDefpom
author_rank: Frequent Contributor
timestamp: May 21, 2023, 05:45:58 pm
content: This was my design, I did it as part of a repair project getting a 1965 version of the 3400A working again.
Troubleshooting Sencore SC61 Oscilloscope - Page 1
Forum section: electronics / testgear

author: Electron123
author_rank: Contributor
timestamp: May 18, 2023, 12:39:41 am
content: I recently purchased an analog Sencore SC61 oscilloscope at a flea market and have been trying it out. I don't have much experience with scopes but I think this one might have some problems. Here's what I've noticed:1. The VPP measurement doesn't work on either channel (it worked once on B but only briefly)2. Sometimes the trace seems "jittery" even when it's not connected to anything. (I've heard that jitter is a technical term but I'm just using it in its normal sense)3. There's something going on with the timebase control. It seemed OK, with a sine wave and set at 2ms (aside from the jitter), then I switched it to 1 and the trace went from a sine wave to a vertical line. I switched it back to 2ms and the trace remained unchanged (vertical line). After fiddling with the knob a while, it ultimately went back to a proper sine wave.Do these problems have any connection? Any suggestions on fixing them? I've already opened it up and sprayed contact cleaner (DeOxit) on the controls, but the timebase one is pretty hard to access.

author: Grandchuck
author_rank: Super Contributor
timestamp: May 18, 2023, 04:51:05 pm
content: Maybe some contact cleaner?
USB Firmware installation quirk RTB2000 - Page 1
Forum section: electronics / testgear

author: eetechTom
author_rank: Contributor
timestamp: May 18, 2023, 12:46:43 pm
content: Answering questions that haven't been asked yet has somehow become a specialty for me. We have some RTB2002 & RTB2004 scopes where I work. When attempting to do a long overdue firmware update, I found the USB drive was not being recognized by the device. This thumb drive was successfully used to update test equipment from Keithley/Tektronix. I found this thumb drive had 2 partitions. One of the 2 was an unallocated partition. I first created a new volume for the unallocated partition. This allowed me to later delete the volume for that partition, leaving only one.The drive can now be used to update firmware on a Rohde scope.
Blown frontend of a Siglent SSA3021X Plus - Page 1
Forum section: electronics / testgear

author: wemme
author_rank: Regular Contributor
timestamp: December 09, 2022, 05:06:50 am
content: Here is another Siglent Spectrum analyzer repair post.I was doing some conducted emissions testing and noticed I was getting some rather screwy results even thought being very careful with clamping the input during power transitions of the DUT.Linking the tracking generator to the RF in port with a N - N cable confirmed that the front end of the spectrum analyzer was damaged with a large hump below ~1.5MHz and well down in level through out the rest of the spectrum. Pulling the analyzer apart I found an Analog Device's HMC1118 RF switch and some DNF diodes instead of the RF pin diodes and RF switches that are usually seen on siglent analyzers. I ordered a new chip which arrived in a few days and reworked the the PCB. The board was more difficult to rework which I put down to the rogers PCB material having a higher thermal conduction than normal FR4.Much to my delight on reassembling the unit the output was level across the spectrum at -20dBmI must say I have found the siglent to be a good spectrum analyzer packed with great features and easy to work on.RegardsBart

author: tautech
author_rank: Super Contributor
timestamp: December 09, 2022, 07:37:57 am
content: Congrats on your repair and for others to find in the future I should link this one here too.https://www.eevblog.com/forum/testgear/what-happens-when-you-blow-the-input-of-a-6500-siglent-ssa-3075x-plus!/

author: F4FEI
author_rank: Newbie
timestamp: May 17, 2023, 04:44:40 pm
content: Hi Bart,Thank you for your very interesting post.I am facing the same problem with my SVA1032x which has the same input circuit.So I will try to change the HM1118.As tools, I have a hot air gun, flux, low temperature welding, a thermocouple, antistatic gloves and bracelet.What advice could you give me to make this operation a success?Thank you in advance.Dominique
Keysight DSOX4104 Upgrade to 1.5GHz - Page 1
Forum section: electronics / testgear

author: AndrewJCS
author_rank: Newbie
timestamp: May 17, 2023, 01:59:55 pm
content: Hello!I just got a used Keysight DSOX4104 and I was wondering if there is an easy upgrade option via firmware update to unlock the 1.5GHz bandwidth or wether this would require any changes. It seems that to purchase this from Keysight the scope needs to go back to them, can't find much information about it.Cheers

author: TheSteve
author_rank: Unknown
timestamp: May 17, 2023, 03:11:49 pm
content: The main board is replaced to go from 1 to 1.5 GHz.

author: AndrewJCS
author_rank: Newbie
timestamp: May 17, 2023, 04:20:06 pm
content: Thanks, so no luck for a hacky upgrade then!
Rigol DHO4000 in standby until new firmware is released - Page 1
Forum section: electronics / testgear

author: luis garcia
author_rank: Regular Contributor
timestamp: May 16, 2023, 10:20:59 pm
content: Hi, i got a Rigol DHO4204 and after several weeks "trying" to work with it, with many crashes in between i have decided to wait for a firmware update. I was thinking it was deffective until i told to other owners, having similar problems. Is any firmware upgrade expected? Bartronix, the seller, is ready for a refund. I dont know what to do.

author: Martin72
author_rank: Super Contributor
timestamp: May 16, 2023, 11:19:20 pm
content: I had the scope in February for two weeks to test.In that short time, it crashed three or four times.In addition, many bugs in the software of a general nature.My verdict at the time was that it is not recommended in the condition.Now 3 months have passed, the bugs that I identified then and the crashes in the time suggest that rigol would have to take care of it quickly.But the last firmware update is from january...I actually like the scope and the ideas behind it are new and good, the hardware is fast.But what good is it if the software does not play along...My tip:If you don't want to play poker, hope it will get better soon, return it and get a SDS2104X HD.This is much more mature, if not quite perfect yet.Siglent is more conservative in this direction, more "serious".

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: May 17, 2023, 05:38:12 am
content: You are a patient man, if it does not work reliably out of the box, I would definitely be returning it. Crashing during daily use is a firm trigger to return, it is such a hit on productivity. You have no idea how long it will take for them to fix it.In my experience, Rigol’s maturity when it comes to managing firmware is juvenile. I hope they will release update to address the bugs, but why torture yourself in the time being. As Martin72 has stated, there are options.I have a Rigol scope, it was my first, and also my last Rigol purchase. Siglent I may buy again, I have nothing against them, they are much more mature when it comes to firmware.

author: Martin72
author_rank: Super Contributor
timestamp: May 17, 2023, 07:45:46 am
content: Hi,https://www.eevblog.com/forum/testgear/rigol-hdo1000-and-hdo4000-12bit-oscilloscopes-launched-in-china/msg4866905/#msg4866905New firmware..

author: coromonadalix
author_rank: Super Contributor
timestamp: May 17, 2023, 10:20:06 am
content: Take the refund and change brands ............ hoping for a FW as its limitThe unit doesn't work "normally" it is not good, while you can do it
Tek PS2521G in series with another PS - Max Voltage?  - Page 1
Forum section: electronics / testgear

author: CM
author_rank: Contributor
timestamp: May 15, 2023, 08:55:25 pm
content: Hello. This may be a dumb question, but I wanted to get an independent opinion on this. I am trying to generate 63V to check the maximum voltage (and maybe reform) some big old output capacitors in a power supply I am checking out. The manual for the PS2521G explains how to run the two 20V outputs in series to obtain 40V. It also goes over how to connect it in series with an "external" power supply to achieve higher voltages. However, the manual (or the front panel) does not specify an output isolating rating. If I run the PS2521G in series to generate 40V, can I safely hood that up in series to another power supply at 23V to generate 63V? The PS was build to accept a mains input of 240V, so I'm guessing the output isolating rating is also 240V. What is your opinion? Thanks

author: J-R
author_rank: Super Contributor
timestamp: May 16, 2023, 11:30:12 pm
content: I don't see how I'd have any concerns up to 72V since that is the official output rating of the sister model PS2520G, but beyond that I might on record vote for something that has documented limits.The true isolation limit is probably hard to pin down, since humidity and PCB contamination for example can change things quite a bit. The design is going to try to cover the worse case.However, assuming all supplies are floating, you may find that the maximum voltage to ground will be lower than 63V. You might measure -27V to +36V, for example. So then you might be confident in reaching quite a bit higher.You could also ground reference one of the outputs to force a result such as -23V to +40V. Doing that is a mixed bag though, especially at higher voltages. On the one hand you're trying to accommodate the isolation limit of one of the supplies, but on the other hand I think I'd rather have everything floating for personal safety reasons. If I'm floating 250V for example, would I rather have -125V to +125V with a hard reference to ground for both high voltage points, or everything floating where as soon as I touch either output it basically equalizes to my level nearly instantly? I'll solicit further discussion from the collective on that, perhaps...
121gw DC volts scale input impedance? - Page 1
Forum section: electronics / testgear

author: innkeeper
author_rank: Unknown
timestamp: May 16, 2023, 12:13:32 pm
content: 121gw DC volts scale input impedance?i am sure its documented someplace but darned if i can find itanyone knows the specs or can point me to the right place to read it.thanks

author: BILLPOD
author_rank: Frequent Contributor
timestamp: May 16, 2023, 06:22:00 pm
content: Good Morning Innkeeper, I just now measured the DC input resistance of my 121GW using my Brymen 869S and I got 11.096 Mohm.

author: thm_w
author_rank: Super Contributor
timestamp: May 16, 2023, 10:15:19 pm
content: Its not in the manual that I can see.lygte has measured and matches with Bills measurement above:Quotehttps://lygte-info.dk/review/DMMEEVBlog%20121GW%20UK.html
E4407B Frequency Response Adjustment (flatness) - Page 1
Forum section: electronics / testgear

author: mbielman
author_rank: Contributor
timestamp: May 17, 2023, 10:22:02 pm
content: Has anyone figured out how to this using SCPI? (which resisters to write to and how values are computed)I really do not want to put out the $$ for the Keysight calibration software, if you can even get a license anymore.Thanks to a post by Aiy, I was able to do a YTM (RYTHM) tune but would like to do flatness as well.regards
HP 8935 no  power up - Page 1
Forum section: electronics / testgear

author: Rik
author_rank: Newbie
timestamp: May 15, 2023, 07:41:29 pm
content: My 8935 was working fine. Passes all tests. It was powered up on my bench and suddenly shut down. It will not power up. The GFI is not tripped. If I turn on the power switch the unlock led blinks and there is a click in the speaker, this repeats over and over.I am guessing there is a power supply problem.Any suggestions here before I dig into it?ThanksRik Rasmussen
Keysight E36731A PSU, Load and Battery Emulator - Page 1
Forum section: electronics / testgear

author: EEVblog
author_rank: Unknown
timestamp: May 16, 2023, 05:21:56 am
content: Turned up on my doorstep!Unboxing video:https://odysee.com/@eevblog:7/2023-05-16-Keysight-BatteryEmulator-1280x720:7
Tektronix TDS320 preventive maintanance - Page 1
Forum section: electronics / testgear

author: Tomshep
author_rank: Newbie
timestamp: May 14, 2023, 08:23:09 am
content: Mine is a new acqisition and apart from needing a few goes to start it up it is currently fine. I don't need to hack it and all I really want to do is future proof it for my forseeable future. I understand that there are a couple of electrolytics that shoud be swapped on sight and the startup resistor needs beefing up, fine.The Dallas chips getting amnesia are the biggest potential difficulty. I would be happy to mill the top off and wire in new batteries in remote holders but before I do that, I need to extract the data from the brute. As far as I can tell, the 310-350 series are sort of orphans and although I have schematics, there isn't much else out there, well, not that I've found yet, anyway.I don't have a GPIB interface and I don't want to scramble the device whilst desoldering it so has anybody any sensible solutions, please?I am happy to do a recalibration although I lack the fast pulse generator and I am most afeared of bricking it of course.My options (I think,) are as follows.Find a firmware dump from another 320.Find out if that of another set in the range is compatible. I have seen others are trying to use the 350 data.I don't know if that requires a hardware mod to 350 spec if that is even possible.Add an interface to read the memory and rtc before pulling them out.Or some other plan. Making up boards gets expensive and parts availability is poor outside of the USA so I have discunted that for the time being.If there is any fellow sufferer out there who can fill some of the holes in my knowledge, I would be very grateful.