hybridfree/eevblog-posts huggingface dataset:
UNI-T MSO7000X 10GSa/s 2.5GHz oscilloscope? - Page 1
Forum section: electronics / testgear

author: TopQuark
author_rank: Frequent Contributor
timestamp: April 29, 2023, 04:01:16 pm
content: So I came across an advertisement banner on Taobao, the Chinese equiv of Amazon, and it caught my eye immediately. 10GSa/s 2.5GHz oscilloscope from UNI-TI thought it was a joke at first, and information about this scope is indeed very scant. The banner ad does not lead to an actual product page, and the scope is not listed on their website either. The only other reference I found to this mythical scope is from a mostly unrelated press release from themselves babbling something about a partnership with some random company.https://www.uni-trend.com/uni-t-strategically-cooperates-with-xun-xin-wei/Nobody including myself really takes UNI-T too seriously I think, especially when it comes to their scopes, but this looks to be a really serious scope. (If it exist)Let’s hope they are not hand bodging double stack resistors to the front end this time.
Cheap test equipment - Page 1
Forum section: electronics / testgear

author: artag
author_rank: Super Contributor
timestamp: April 29, 2023, 05:39:07 pm
content: There are lots of cheap test equipment modules on ebay and aliexpress, but it's hard to know much about their quality.In many cases there have been reviews, mod suggestions, schematics etc. posted but these can be hard to find.Does anyone know of a good resource for such documentation ?Unless anyone does, I'm going to suggest we create one here. We can post links and I (or a helper) will update the thread start to keep an index. If it works out, perhaps we can get the thread pinned. This thread will do for test equipment - anything from an ESR meter to a nanoVNA - but other modules such as power supplies can have their own thread.Note that this is an index, not a review site. It will link to other people's information wherever that is, it won't steal or copy it.

author: AVGresponding
author_rank: Super Contributor
timestamp: April 29, 2023, 06:37:51 pm
content: My personal experience is that the AT328 based component testers are pretty good, the 584 based references also, but the one sig gen (icr the exact model, sorry) was total garbage. Oh, there's some 4.5 digit LED meter modules, they're pretty damn accurate too.https://www.ebay.co.uk/itm/275074499660

author: nctnico
author_rank: Super Contributor
timestamp: April 29, 2023, 07:11:08 pm
content: Here are a few topics about low cost equipment I have:https://www.eevblog.com/forum/testgear/vc8145-thread-it_s-here-finally/https://www.eevblog.com/forum/testgear/xjw01-auto-lcr-meter-review-($120-bench-top-lcr-meter)/https://www.eevblog.com/forum/testgear/rek-kps6003-and-gophert-nps-1602-60v-3a-psu-hack-review/My general rule is that up to around the $100 mark you typically can't go wrong. Equipment in that price range doesn't pretend to replace any A-brand equipment but nevertheless does a good job to privde basic functionality. And if you need to upgrade, you'll still have a nice tool for occasional use.
SIGLENT SVA1032X RECTANGULAR  PLOT OF R+/-JX VS FREQUENCY - Page 1
Forum section: electronics / testgear

author: W4OP
author_rank: Newbie
timestamp: February 22, 2023, 04:22:26 pm
content: Is there any hope of new firmware supporting a rectangular plot of Z vs frequency. I know I can get the data from the Smith chart plot, but for many applications this is clumsy and does not visually yield what the rectangular plot would.Regards,Dale

author: W4OP
author_rank: Newbie
timestamp: April 28, 2023, 05:52:28 pm
content: Just renewing my plea for a rectangular R+/- JX plot capability for the Siglent SVA1032X in future firmware. Pretty basic.Dale
Alternative soldering pencil for a Goot RX-802AS station  - Page 1
Forum section: electronics / testgear

author: guswin95
author_rank: Contributor
timestamp: April 28, 2023, 07:37:28 pm
content: Hello all,I recently picked up a base station only of the Goot RX-802AS 80W soldering station. Its a 120V version.Unfortunately, it appears quite difficult to find parts in the US. Looking for an inexpensive way to utilize this base.The new set is about $250 without tips; which are about $25-30 each. I was wondering if it would take a Weller of Hakko pencil with easier and more inexpensive tips to make this economical to use. Being the upper limit a new station cost ($250).Comments online appear to be very favorably as the quality of this station and many European and South American users seem to like it.Any ideas are welcomed. Thanks

author: TopQuark
author_rank: Frequent Contributor
timestamp: April 29, 2023, 01:38:28 am
content: It is a good station, I liked mine, gave it away to a friend now that I have switched to Metcal.I think it is hard to source part anywhere in the world unless you are in Japan. I had to import the ultrafine tips and hot tweezers from amazon JP. Perhaps you can see if amazon JP ships to where you are, and if the price of the parts are reasonable.The Goot tips uses 4 pins + a earth connection, quite unconventional I'd say. I don't think it will be very easy to have it work with other tips. The station also seem quite sensitive to tip profiles, e.g. the way to detect idle and enter sleep is literally sensing the heat loss at the tip, if the heat loss is minimal (not soldering), it decides to go into sleep.
Internals of a Philips PM3580/PM3585 Pod  - Page 1
Forum section: electronics / testgear

author: SaabFAN
author_rank: Frequent Contributor
timestamp: May 10, 2016, 03:56:41 pm
content: Has anyone opened one of these Pods and took a look inside?There are quite a few of these instruments on ebay for low prices, but the pods don't come with them, so I was wondering if it is possible to build such a pod.The User-Manual talks about an RC-Network inside the pod, but doesn't give any details except that the inputs can be damaged if this RC-Network is missing.

author: SaabFAN
author_rank: Frequent Contributor
timestamp: May 13, 2016, 06:35:30 pm
content: I think I've found the answer to my question: In the Workshop-Manual I found online, the input-circuitry is shown and the PODs, at least the passive ones, contain only a RC-Network, and have data-lines from the pods near the DUT to the connector at the front of the analyzer with a 151Ohms impedance.I think with some resistors and a custom PCB, as well as a high-speed IDE-Cable it should be possible to build such a pod.Seeing the inner workings of such a pod, to verify these findings, would still be nice though^^

author: Lunasix
author_rank: Regular Contributor
timestamp: May 13, 2016, 07:47:29 pm
content: I remember I've done, years ago, terminal pods to solder on equipment under test. Cables are simple, they use twisted pairs but can be replaced by simple flat cable. In pod, each signal line is terminated by 2 capacitors and 1 resistor, if I have a good memory (not sure). I will be able to verify and to read values, I have some of these pods at home, but I'm not will be there before 1 or 2 weeks...

author: Lunasix
author_rank: Regular Contributor
timestamp: July 31, 2016, 08:07:24 am
content: Photos of pods made years ago (!) to be soldered on test equipment and to be connected directly to the flat cable.

author: Uppic
author_rank: Newbie
timestamp: April 28, 2023, 04:48:59 pm
content: hello everyone, old age (recently retired) has given me retro computing (MSX, spectrum, amstrad,...), I've always liked electronics. He has given me a PM3585, which they had in a cornered workshop, but without the pods. I would appreciate if you can help me get it working. My intention is to use it for these old microcomputers, nothing serious, I just love these old computers.If someone has a disused pod in some forgotten corner and can offer it to me at a reasonable price, I would be very grateful.I also want to do the ones that are discussed in the forum, and know if someone has done it and they work well.thank you so much .

author: SaabFAN
author_rank: Frequent Contributor
timestamp: April 28, 2023, 05:39:59 pm
content: I haven't done one of those pods, but I think I'll create one on my next electronics stream. At least the design. Should be simple enough.I'll post KiCAD-Files on Github when I'm done

author: Uppic
author_rank: Newbie
timestamp: April 28, 2023, 05:59:01 pm
content: Thank you very much for the contribution, I look forward to it.
Marconi 2024 Signal Generator power supply pin outs - Page 1
Forum section: electronics / testgear

author: dwight_talley
author_rank: Contributor
timestamp: April 23, 2023, 09:46:10 pm
content: I have a Marconi 2024 Signal Generator that has a bad power supply. I need to know what the voltages are for the connector on the supply. I plan on using another supply and want to connect everything up correctly.I have replaced a resistor, R2 since it was open but it may take me a while to find all of the issues with the old supply so I will use another power supply. I have the schematics of the 2024 but it don't show the voltage values for the connections.Any schematic of this HV160-47 supply would be appreciated.ThanksDwight

author: Andy Watson
author_rank: Super Contributor
timestamp: April 23, 2023, 10:32:24 pm
content: M2024_Page.pdf(66.62 kB - downloaded 277 times.)Taken from page 83 of IRF service manual - Issue 3 - 8-Sep-98. Hopefully, V1-V4 aligns with the legend on the PCB.

author: dwight_talley
author_rank: Contributor
timestamp: April 23, 2023, 10:40:37 pm
content: Thanks a lot. That got me in the right direction.Dwight

author: Andy Watson
author_rank: Super Contributor
timestamp: April 23, 2023, 10:48:06 pm
content: There are at least two versions of the service manual on the web - it's probably worthwhile seraching-out all versions - there are slight differences. Search for IRF 2023/2024 too.Also, there's a google-groups for Marconi instruments:https://groups.io/g/Marconi-Test-Instruments

author: George Edmonds
author_rank: Frequent Contributor
timestamp: April 23, 2023, 11:19:22 pm
content: HiPlease be aware that there was at least five different vendors power supplies used in the 2023/2025 series and that they did not all use the same type of output pins, some used screw terminals.The supply that you have is a Lambda-Coutant unit. Invariably the four 100uf 250VDC main bulk storage capacitors fail and this results in multiple problems within the supply. If it is used on 230VAC and even more nasty failure can occur. This supply is auto 115VAC or 230VAC switching, when used on 230VAC a brown out can cause it to switch to 115VAC but not switch back for 230VAC when the brown out ceases. They don’t like 230VAC when in 115VAC mode and quit with extreme prejudice.With the exception of the output pins, which are screw terminals, the MW RQ-125D is a physical and electrical direct drop in replacement.When replacing the power supply please make certain the +5VDC supply is set to 5.2VDC to allow for internal voltage drops in the 2023/2025, other wise the CPU can have a mental break down.G Edmonds. Marconi-Test- Instruments group owner.

author: dwight_talley
author_rank: Contributor
timestamp: April 28, 2023, 02:55:14 am
content: Thanks everyone for your info. I have a working 2024 sitting on my bench. It seems to be working fine. I will do some research on the menu and settings. Nice clean signal at the oscilloscope.Dwight
Motorola Service Monitor R2600  R2660 - Page 1
Forum section: electronics / testgear

author: IFMATOS
author_rank: Newbie
timestamp: April 28, 2023, 01:20:10 am
content: I just bought an Used Motorola Service Monitor R2660. It works fine but the level of Spectrum Analyzer and Modulation Scope is too high. With or without signal I can only see the botton of the wave foot.. DVM meausre OK, receiver, frequency OK, Sound, Generator. Can anyone give an idea of a probable cause ? Thank you
N5181A Agilent RF Generator - Page 1
Forum section: electronics / testgear

author: fmnardini
author_rank: Newbie
timestamp: April 27, 2023, 09:11:08 pm
content: Hello all,I am writing because we did a teardown of the N5181A Agilent RF Generator and found three Agilent attenuators (some pictures attached).The question is the following: why do they embed leds? What is the technical reason behind this choice? We do not see the point in having them emit light!Thanks in advance for your answers.best,Franco Maria and Marco (from Italy)
34410A ADC - Page 1
Forum section: electronics / testgear

author: NNNI
author_rank: Regular Contributor
timestamp: May 03, 2023, 06:58:55 pm
content: Hello,This might sound like a rather absurd request, so let me provide some context.I've been interested in integrating ADCs for over a year and have attempted to build my own, which you can find here:https://www.eevblog.com/forum/projects/(yet-another)-diy-multislope-adcI came across this rather interesting paragraph in the Art of Electronics (third edition) on page 921, detailing the operation of Agilent's Multislope IV topology:"Looking at Multislope IV waveforms with a scope, you see a much different beast. A1b has been replaced with a faster AD829 op-amp (120 MHz, 230 V/μs), with the integrating capacitor C1 reduced by 5×. A hardware engine forces the error integrator to produce consistent 10 Vpp ramps with a 2μs period, using coarse data from an 80MHz AD9283 converter digitizing the 10V ramp at 14 ns intervals, and fine data from an AD9200 10-bit converter with a limited 2V range, clocked at 75 ns intervals near zero volts. Slope changes and the counter record are made at 75 ns intervals, and the AD9200 makes starting and ending readouts with 0.02% resolution. As a result, a Multislope IV converter can measure 4.5 digits in 20μs (0.001 PLC), or 20× faster than Multislope III."I tried to figure out exactly what was going on here, but the description is somewhat vague and does not go into the details much. I was able to find a few relevant patents (US6876241 and US20050024119A1) and the schematic (https://www.dcddcc.com/blog/34410a/schematic.34410a.pdf), but once again, they don't particularly dip into the operation of the ADC itself. The only way to analyze it would be to actually probe the ADC itself, but since my means are very limited as a student, I was wondering if someone here has already captured integrator/control circuit waveforms or would be open to doing so.Regards,NNNI
Rigol DS1054: Can it freerun w/o trigger? - Page 1
Forum section: electronics / testgear

author: OhhJustPeachy
author_rank: Newbie
timestamp: April 26, 2023, 04:38:05 am
content: I'd like to use my Rigol DS1054 in a fashion that's better than a logic probe but worse than a logic analyzer by just setting the sweep frequency as near as I can to some integer dividend of the UUT's clock frequency and watching states flip around, i.e. with no trigger at all. I suppose I could hack this behavior by setting the time base mode to XY and feeding a sawtooth wave into the X channel and the probe into the Y channel but it seems like the scope ought to be able to do something like this on its own.

author: Fungus
author_rank: Super Contributor
timestamp: April 26, 2023, 07:20:47 am
content: Turn one channel's vertical range way down so you can see the background noise. Trigger off that.Quote from: OhhJustPeachy on April 26, 2023, 04:38:05 amOr feed your "sawtooth" into one channel as a trigger and you havethreemore for looking at signals.

author: ebastler
author_rank: Super Contributor
timestamp: April 26, 2023, 04:19:01 pm
content: You have not told uswhyyou would want to run the scope like this. Why don't you trigger on the edge of the signal under test (or one of the signals)? That will give you one stable reference point on the horizontal axis of the screen.If you prefer, shift the trigger time towards the left edge of the screen. You can also trigger on any (i.e. positive or negative) edge of the signal if you prefer that. If this does not work for your application, please indicate what's missing.Edit: tpyos...

author: OhhJustPeachy
author_rank: Newbie
timestamp: April 26, 2023, 10:23:23 pm
content: QuoteWhat I'm wanting to do is watch a few bits' worth of something like a RAM address line that's stable in time, like show me a trace of ten sequential bits. Even if I trigger on a risingorfalling edge like you suggest - which hadn't occurred to me; I was looking at the manual last night and I don't remember seeing that option but I'll look again - two zeroes or two ones in a row will move the line over. Maybe what I need to do is bring the clock in on another channel and make it trigger on that.

author: ebastler
author_rank: Super Contributor
timestamp: April 26, 2023, 10:43:40 pm
content: Ah, so there is a periodic process at a sub-harmonic of the system's clock. In that case I would agree with the idea that was mentioned in the other copy of this thread -- use the trigger hold-off time, which can be adjusted quite precisely. And trigger on the system's main clock for an exact sync without drift.

author: james_s
author_rank: Super Contributor
timestamp: April 26, 2023, 11:48:25 pm
content: You can absolutely trigger on a rising or falling edge, that is one of the most basic functions that every single oscilloscope made in about the last 50 years will have.
Small SA with at least 50Khz and -80db dynamic range - Page 1
Forum section: electronics / testgear

author: pfm
author_rank: Regular Contributor
timestamp: April 28, 2023, 03:56:26 am
content: I am looking for a spectrum analyzer in a small form factor (handheld or even just hardware that works with a tablet or pc), that has min input freq of at least 50khz or lower, and has a dynamic range of -80db or better.I see a few online but so far I have managed to find only with min 100khz and -70db dynamic range. and price is good too (less than $100 or $200) but I need the ranges slightly more extended.Any options ? or no such thing exists ?Budget ~$200 based on what I have seen so far.Thanks!
Racal 6103E Digital Radio Test Set Original Firmware - Page 1
Forum section: electronics / testgear

author: dosdude1
author_rank: Newbie
timestamp: January 22, 2022, 10:06:35 pm
content: About 6 years ago, I acquired a Racal 6103E digital radio test set from a friend of mine. Unfortunately, it seems that some company, "Anite", has installed some sort of custom firmware to the device, making it useless as a standalone device without their special control software and/or extra equipment. My goal was to attempt to restore the stock firmware onto the device (I did get manuals and a couple floppy disks containing firmware updates with the device), but unfortunately the Anite firmware does not allow me to put the device in firmware updating mode, at least as specified in the manual. With that said, I am posting here to see if, A, someone had any ideas on how to actually use this Anite firmware, and ultimately get the device into firmware programming/update mode, or B, would be able to dump the EEPROM(s) of a similar device still containing the original firmware so that I could simply flash the device's EEPROM(s) externally. The firmware files included with the firmware update floppy disks are not in a format that can just be simply flashed to an EEPROM, but are attached if anybody wants to take a look at them. Thanks in advance, I appreciate any input you have to offer.

author: PeterPan12
author_rank: Newbie
timestamp: August 11, 2022, 06:29:46 am
content: Hey did you can priovide my the Manuals for the 6103E. Mine have the normal Firware but my Mobile Phone wont find the BTS. Perhaps i find some hints in the Manual.And is this the Orginal Firmware or Antie Firmware ?Reargds PeterPan12

author: dosdude1
author_rank: Newbie
timestamp: April 26, 2023, 09:13:58 pm
content: I've finally gotten this all resolved, by way of buying another unit off eBay that still had the stock firmware installed, and dumping its ROMs. The ROMs in question are 4 PLCC32 29F040 512K EEPROMs located on the bottom side of the main backplane board, as shown in the attached photo. The dumps of these ROMs are attached as well. In order to restore the firmware with the dumps, simply remove each EEPROM, and flash the respective dump onto each one. Once soldered back on, the device should then boot into the original firmware. Please be aware, though, that these ROMs seems to contain calibration data (or at least a calibration checksum), so the device will complain on boot of a calibration checksum mismatch. Otherwise, it's proven to work perfectly fine. I've even been able to connect a phone and run tests on it, as shown in the second photo.

author: dosdude1
author_rank: Newbie
timestamp: April 26, 2023, 09:22:41 pm
content: Quote from: PeterPan12 on August 11, 2022, 06:29:46 amIn order to connect a (modern-ish) phone to the unit, you need to program a SIM card to the parameters of a "Test SIM", which are as follows:PIN: 0000 0000PUK1/2: 11111111 22222222Ki: 5E4AB35891375D2AEE812E67C309A629IMSI: 001010123456789Admin Field/ADM: 80I used the following SIM cards/programmer from AliExpress:https://www.aliexpress.us/item/3256805102848304.html
HP3478A DMM Calibration in Sydney. Where is best? - Page 1
Forum section: electronics / testgear

author: jhoffman
author_rank: Contributor
timestamp: April 25, 2023, 09:29:03 pm
content: Salutations !!!I recently purchased a HP3478A DMM in excellent condition.I've done an incredible amount of research into the HP3478A (Dave's HP3478A teardown video, not to mention every other YouTube video out there) and downloaded every user and service manual available.So save yourself the time and energy, by telling me trivial stuff, such as to replace the battery (and why I should do this!!!) because I know all of that.WhatI DON'T KNOWis where can I get my HP3478A DMM calibrated for a reasonable price in Sydney - Australia?Any suggestions?

author: tautech
author_rank: Super Contributor
timestamp: April 25, 2023, 09:39:20 pm
content: Let Google be your friend.Try:KEYSIGHT TECHNOLOGIES AUSTRALIA PTY LTD

author: Miti
author_rank: Super Contributor
timestamp: April 26, 2023, 01:40:31 pm
content: Quote from: tautech on April 25, 2023, 09:39:20 pmI think you missed the “reasonable price” in his question. I doubt Keysight and reasonable price can go in the same sentence.
Jumpy Oscilloscope Encoders: Another way to fix them - Page 1
Forum section: electronics / testgear

author: TomC
author_rank: Frequent Contributor
timestamp: April 25, 2023, 08:08:49 pm
content: After reading some of the other posts on encoder problems, I decided to try a different method when faced with barely usable encoders on my OWON SDS7102. This method requires removing the encoder board and drilling tiny lubrication ports on the encoder's body. Then allowing a few drops of Deoxit to go inside followed by turning the encoder back and forth a few times. It's been a couple months since I used this method and my encoders are still working as good as new.Note: If you decide to try this method, be careful when you drill, go slow and stop as soon as you go thru the plastic body. Otherwise you may damage the contacts inside.
Rigol DS1054: freerun sweep - Page 1
Forum section: electronics / testgear

author: OhhJustPeachy
author_rank: Newbie
timestamp: April 26, 2023, 04:39:18 am
content: I'd like to use my Rigol DS1054 in a fashion that's better than a logic probe but worse than a logic analyzer by just setting the sweep frequency as near as I can to some integer dividend of the UUT's clock frequency and watching states flip around, i.e. with no trigger at all. I suppose I could hack this behavior by setting the time base mode to XY and feeding a sawtooth wave into the X channel and the probe into the Y channel but it seems like the scope ought to be able to do something like this on its own.

author: Fungus
author_rank: Super Contributor
timestamp: April 26, 2023, 12:22:49 pm
content: You could mess around with the "timeout" trigger.Set it to minimum, turn the gain of one channel way up and trigger off the noise on that channel. That leaves you three channels to play with.Quote from: OhhJustPeachy on April 26, 2023, 04:39:18 amIf you're going to do that then feed the sawtooth into a channel and trigger off it. That leaves you with three other channels.I think the trigger channel can be hidden if it annoys you to see ti on screen.

author: wasedadoc
author_rank: Super Contributor
timestamp: April 26, 2023, 02:03:05 pm
content: Do not post the same question twice.https://www.eevblog.com/forum/testgear/rigol-ds1054-can-it-freerun-wo-trigger/msg4832756/#msg4832756

author: OhhJustPeachy
author_rank: Newbie
timestamp: April 26, 2023, 02:25:50 pm
content: The site threw an error the first time I tried to post. I saw that it had accepted it anyway and I tried to delete it, but it wouldn't let me. Sorry; I tried.
E.S.I model 2150 Video bridge (LCR) help needed. - Page 1
Forum section: electronics / testgear

author: Paceguy
author_rank: Regular Contributor
timestamp: January 05, 2021, 05:17:26 am
content: Does anyone here have any knowledge and experience with E.S.I 2150 / 2160 video bridges? I was given one that blows the main power fuse. I would suspect the power supply or CRT circuitry could be the culprit. To get at these involves a major teardown. Are these units known for any common failures that I should check first? Hopefully it's a common and easy to find part and not something specialized that's only available through E.S.I.

author: picburner
author_rank: Frequent Contributor
timestamp: January 05, 2021, 08:47:59 am
content: Some time ago I posted all the ESI 2150/2160 service manual on theKO4BBwebsite.Due to the big size it is divided into chapters (1 file per chapter).Chapter # 4 (Calibration and Maintenance) ended up in a different folder, I don't know why.With the schematics it will be easier for you to find the fault.

author: Paceguy
author_rank: Regular Contributor
timestamp: January 14, 2021, 12:52:58 pm
content: A bit of an update: I opened it up, went to the power supplies. I found a shorted 1N5832 schottky stud type diode and horizonal output transistor, 2N6543 is also totally shorted. Luckily I have some NOS ECG 283 horizontal output transistors since many suppliers no longer stock horz. output transistors. I checked all the other components on both boards and couldn't find anything else. Popped in a new fuse and still a problem. Fuse opens but doesn't blow as bad ( black ). Any ideas?

author: Testtech
author_rank: Regular Contributor
timestamp: April 19, 2023, 07:30:39 pm
content: I know is is an ancient post, but, did you ever resolve this?I have the same problem.

author: Paceguy
author_rank: Regular Contributor
timestamp: April 25, 2023, 05:19:40 pm
content: I put the 2150 aside for some time and ordered some replacement parts last week and they arrived today. I plan to open it up and give it another try. I will post updates shortly.

author: Paceguy
author_rank: Regular Contributor
timestamp: April 25, 2023, 05:22:25 pm
content: Quote from: Testtech on April 19, 2023, 07:30:39 pmWhat is the exact problem with your 2150 ? If it blows the mains fuse, start by checking the power supply and high voltage section.
How to enable Option AM in a Tektronix TLA7AC4? - Page 1
Forum section: electronics / testgear

author: calibrationfixture
author_rank: Regular Contributor
timestamp: April 25, 2023, 09:45:25 am
content: Hi to All,I used; SYST:CONF:OPT AM. Comparable with what to be used for a TLA7PG2 (in that case; SYST:CONF:OPT OPT1M). With this I got Extension: AMux BASIC and Analog Outputs Disabled. Option AM (AMux FULL) is still a possible Upgrade in TLA Powerflex Utility. Used also:SYST:CONF:OPT AMFULLSYST:CONF:OPT OPTAMSYST:CONF:OPT OPTAMFULLas scripts. AMux FULL is still a possible Upgrade. Anybody?Calibrationfixture

author: nctnico
author_rank: Super Contributor
timestamp: April 25, 2023, 09:59:53 am
content: Quote from: calibrationfixture on April 25, 2023, 09:45:25 amLoad the Powerflex utility exe file in a hex editor and look/search for the option strings. You'll find the correct option name for sure.
Agilent 34401A button repair - Page 1
Forum section: electronics / testgear

author: buck converter
author_rank: Regular Contributor
timestamp: March 02, 2023, 05:53:22 am
content: I have some 34401A and they all have issues with the button pads. A lot of the buttons, especially the shift needs a lot of pressure to activate. Is there a best practice for repairing this?Thank you in advance.

author: robert.rozee
author_rank: Frequent Contributor
timestamp: March 02, 2023, 07:40:46 am
content: disconnect the ribbon cable to, then carefully remove, the front panel. disassemble PCB from the rest, and (gently) clean both the conductive rubber button pad contacts as well as the PCB contacts with IPA or similar, then see if there is an improvement. i'd be a little surprised if the conductive rubber had deteriorated, but others may be able to comment further on that.cheers,rob :-)

author: coromonadalix
author_rank: Super Contributor
timestamp: March 02, 2023, 11:53:40 am
content: https://www.ebay.com/itm/362513186617?hurry loll

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: March 02, 2023, 04:19:46 pm
content: I second Robert's suggestion. If it doesn't work, perhaps some Caikote 44 may work if you don't want to change out your keypad.While you have the keypad out, it is also a good time to clean the sides and the part behind the front panel, as well as the openings around each key on the panel. It can make your 34401a keypad look new again.Good luck.

author: buck converter
author_rank: Regular Contributor
timestamp: March 06, 2023, 02:03:02 pm
content: I have attempted repair on one of my units so far. I rubbed IPA all over the pcb and button membrane, twice. It improved most buttons, leaving just one that needs to be jammed in to activate.Is there a different chemical that performs better? I have a few more units with the same issue. These are from a classroom lab and saw daily use from multiple sections a day for who knows how many years.

author: GigaJoe
author_rank: Frequent Contributor
timestamp: April 25, 2023, 03:04:54 am
content: not really chemical, rubber is conductive, need to restore conductivity, i use a soft b2 b3 pencil on membrane keyboards button. guess it the same way.

author: floobydust
author_rank: Super Contributor
timestamp: April 25, 2023, 03:36:42 am
content: The SHIFT button doesn't get pressed so much so I suspect dirt, not wear.With the 34401A, I take them right apart and the keypad out and clean GENTLY dish soapy water, use an old toothbrush and rinse.There's everything from hair to component lead clippings inside. The silicone keypad does tear apart easily so it's not easy to work on.Next I use IPA and Q-tips to clean the PC board. It doesn't have carbon print.I've tried various methods to repair keypads. I would just order the remote control/conductive rubber pads kit. That's the best IF the pads are worn out.https://www.eevblog.com/forum/repair/carbon-contact-pad-repair/msg4032652/#msg4032652https://www.eevblog.com/forum/repair/best-method-to-restore-conductive-keypads/
Tektronix 2246 pros and cons? - Page 1
Forum section: electronics / testgear

author: tatel
author_rank: Frequent Contributor
timestamp: April 23, 2023, 05:16:36 am
content: I have found a Tektronix 2246. Owner says it's working and provided pictures with traces on the screen. So at least CRT and one channel are working.However, I have read somewhere it's full of unobtanium hybrid parts.Price seems good for Europe.Would you get it?Any caveats?

author: wn1fju
author_rank: Frequent Contributor
timestamp: April 23, 2023, 12:27:02 pm
content: It does have some hybrids, but not as many as some of Tek's other models (e.g. 24xx).I have a 2246 and it is one of my favorite scopes, but at 100 MHz, it is obviously less suited for many modern applications.You didn't mention the asking price, but here in the USA, you can typically find these for less than $100 in "untested" condition. You could always ask the seller to show you pictures with the scope working on all four channels and/or with various timebase settings. That at least would verify most of the hybrids are OK.

author: tatel
author_rank: Frequent Contributor
timestamp: April 23, 2023, 03:30:58 pm
content: I'm afraid price is twice that here. But, hey, an EBay 20 MHz dual-channel Hameg would be the same price, delivered. They ask even €350 for these Hamegs! This will be almost a local pick, just some 100 kms from home. So, not that bad, I would think. Will see.I want it to do PE-connected work, so maintaining my entry-level GW Instek DSO safe. Destroying it would set me back above €500 right now.Also I want to see what's that makes analog oscilloscopes so appealing to so much experienced people. I hope it's not just nostalgia.Thank you!

author: martinr33
author_rank: Frequent Contributor
timestamp: April 24, 2023, 04:50:14 am
content: It wasn't nostalgia, but...I have a 2467B, a 400MHz scope that can catch and display a single pulse just a few nanoseconds wide. Digital scopes used to need a repeating waveform and multiple samples to get a good image.Now, though, $1k and a bit of hacking will get you an 8MS/sec Rigol with logic analyzer capability.So my analog scopes (and early digitals) are now retired.

author: tatel
author_rank: Frequent Contributor
timestamp: April 24, 2023, 11:00:40 am
content: Yep. MSO5074 and his siblings are really impressive.
How to Compare Two Recorded Waveforms on Rigol DS1054Z - Page 1
Forum section: electronics / testgear

author: reynolds087
author_rank: Newbie
timestamp: April 23, 2023, 11:23:21 pm
content: I have a Rigol DS1054Z, and I'm trying to view two waveforms on two different channels using the "SINGLE" button. Ideally, I want to capture the output from an IR transistor when I click the power button on my remote control, then capture the output from the same IR receiver when I output a signal from my microcontroller attached to an IR LED. I just want to make sure they are outputting the same signal. Is there a way to do this on my scope? Every time I get the first waveform on the screen, and I switch from channel 1 to channel 2 and press the "SINGLE" button, the capture I did on channel 1 disappears.

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: April 23, 2023, 11:33:28 pm
content: you can press the "REF" button and save the waveform on channel 1, then capture the waevform on channel two and then you can compare themThe white waveform is the reference waveform from a previous capture.

author: Martin72
author_rank: Super Contributor
timestamp: April 23, 2023, 11:41:45 pm
content: When the delay between the two signals is not too long for the display/timebase setting, it is no poblem:2 channels active, trigger on one channel.If the signal on one channel is triggered and acquisition stops, you see also what happen on the second channel at the same moment.

author: reynolds087
author_rank: Newbie
timestamp: April 24, 2023, 04:24:44 am
content: Thanks, that worked, although I do have some trouble getting the "SINGLE" button to work consistently. Sometimes I just have to turn the scope on and then off again. Is there any settings that heavily influence its ability to capture a waveform? When I just hit "RUN" I can clearly see the signal on the screen, but just for a split second and then it's gone. Then I flip to "SINGLE" and sometimes it will just sit there waiting. There doesn't seem to be any rhyme or reason to why it works sometimes and not others.

author: Martin72
author_rank: Super Contributor
timestamp: April 24, 2023, 05:51:26 am
content: It depends on the triggerlevel:Example, you want to capture a logical signal, from zero to high level.Then you could set the triggerlevel to say 2V and positive edge and press Single.Trigger is now armed and will take a shot when the signal rises above the prior levelsetting.
High efficiency bench power supply for LiFePo4 charging - Page 1
Forum section: electronics / testgear

author: rfspezi
author_rank: Regular Contributor
timestamp: April 22, 2023, 09:29:44 pm
content: I am in search of a cheap high-efficiency bench power supply (200...400 W) for LiFePo4 (12 V) battery charging.Wanptek products look interesting - however i can not find any efficiency data and fear that these devices are far below 90%?
Oscilloscope screen replacement - Page 1
Forum section: electronics / testgear

author: drakepirate
author_rank: Newbie
timestamp: April 10, 2023, 05:18:43 am
content: Hi,I’d like to know the correct screen replacement for my UNI-T UT2025C that I got without it. I see it has a 40PIN ribbon connector and looks to have FFCL retro light plug.I found one on line , the Hitachi TX14D11VM1CAA /CBA but not sure if could work.https://www.panelook.com/TX14D11VM1CAA_KOE_5.7_LCM_overview_3293.htmlAny specific model that I could order?Thanks

author: drakepirate
author_rank: Newbie
timestamp: April 23, 2023, 02:17:55 pm
content: Installed and workinghttps://www.aliexpress.com/item/1005002611605602.htmlThanks
Test Leads for UT61E - Page 1
Forum section: electronics / testgear

author: ko4nrbs
author_rank: Regular Contributor
timestamp: April 21, 2023, 10:27:45 pm
content: Can someone recommend a good set of test leads for a UT61E multimeter?Bill

author: mwb1100
author_rank: Frequent Contributor
timestamp: April 21, 2023, 10:37:04 pm
content: https://probemaster.com/- I put off buying some of these for so long because the photos made me think they'd be uncomfortable to use. I was totally wrong - they are every bit as good as people say. And you can get them however long you like and can opt for straight banana plugs instead of the right-angled ones that are usually used (and that I find more irritating than not).If you're a Fluke fan, then TL-71 leads are nice - much nicer than the TL-75s that usually come with their meters.If you're in the EU or already buying something else from welectron.com (to cover the shipping), then these Brymen leads are greatandcheap (10 EUR + shipping):-Brymen BL21S2-T4SC Silicone Test Leads

author: Martin72
author_rank: Super Contributor
timestamp: April 21, 2023, 10:43:06 pm
content: I´ve bought testleads from probemaster for my brymen by welectron and never regret it.Like them more than the ones we have at work from fluke.

author: ko4nrbs
author_rank: Regular Contributor
timestamp: April 22, 2023, 12:56:08 am
content: Quote from: mwb1100 on April 21, 2023, 10:37:04 pmWhat size do I need for the UT61E?Bill

author: Per Hansson
author_rank: Unknown
timestamp: April 22, 2023, 08:05:43 am
content: Quote from: ko4nrbs on April 22, 2023, 12:56:08 amAny 4mm standard test lead will fit.I have bought these and they work great with both the UT61E and my Flukes:Probe Master 8017S Softie Test Leads 120cm

author: skander36
author_rank: Frequent Contributor
timestamp: April 22, 2023, 09:52:54 am
content: Any 4 $ test lead is good enoug for this meter.

author: Martin72
author_rank: Super Contributor
timestamp: April 22, 2023, 02:44:47 pm
content: Boooo....
Tektronix Ths720A & power bank PW7015L & DC-DC Converter module  - Page 1
Forum section: electronics / testgear

author: PIC18F2550
author_rank: Newbie
timestamp: April 22, 2023, 11:58:44 pm
content: hello alli need help for pinout conector jack of power bank "pw7015l" or dell addapter , i try for use my power bank dell for my osclloscope THS720Ai have power bank "pw7015l" 19volt 18000mah , and dc-dc converter for using to converte the 19volt to 12volt, but the powerbank is not power ON becuse pin3 wire not connectedlink for power bankhttps://www.google.com/search?q=power+bank+pw7015l&tbm=isch&ved=2ahUKEwifm_fPzr7-AhWNvicCHf26Ac0Q2-cCegQIABAA&oq=power+bank+pw7015l&gs_lcp=CgNpbWcQAzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzoECCMQJzoICAAQCBAeEBNQmr0GWP_oB2D17QdoAnAAeACAAYoBiAGDApIBAzAuMpgBAKABAaoBC2d3cy13aXotaW1nsAEKwAEB&sclient=img&ei=-GlEZJ-_JY39nsEP_fWG6Aw&bih=704&biw=1458&rlz=1C1NDCM_frDZ1024DZ1024link for conectorhttps://www.google.com/search?q=dell+laptop+charger+pinout&tbm=isch&ved=2ahUKEwi8p-CVzL7-AhW2mycCHbmyBzkQ2-cCegQIABAA&oq=dell+charger+pinout&gs_lcp=CgNpbWcQARgBMgcIABCABBATMggIABAIEB4QEzIICAAQCBAeEBM6BAgjECc6BQgAEIAEOggIABCABBCxAzoECAAQHjoICAAQBRAeEBNQzhRYwXtg36oBaABwAHgAgAG4AogBlBaSAQgwLjE4LjEuMZgBAKABAaoBC2d3cy13aXotaW1nwAEB&sclient=img&ei=ZWdEZPzgLLa3nsEPueWeyAM&bih=704&biw=1458&rlz=1C1NDCM_frDZ1024DZ1024link for dc-dc converterhttps://www.ebay.com/itm/192208371512thinkyou in advance for help and sory for my english
Alternative switching system of Keithley7001 mainframe/7012 switch matrix? - Page 1
Forum section: electronics / testgear

author: hank780420
author_rank: Newbie
timestamp: April 22, 2023, 04:21:35 pm
content: Hi:I have a home built measurement system equipped with Keithley 7001/7012-S combination to perform DC/low frequency AC measurements.However, Tektronix told me that they stopped providing maintanance to 7001/7012-S when I found one of the 7012-S card became unrecognizable to 7001 several month ago.I did get two 7012-S cards from e-bay with relatively resonable price, and with good luck, they both work in good condition.However, I notice that it becomes harder and harder to find switch card for 7001 mainframe, I'm worry that I can't find any replacement in near future.Also, I won't consider the "awesome DAQ solution" from Tektronix as they force you to pay adittional $1000+ for a barely useless 6.5 digit DMM for a simple switch system.(That is DAQ 65XX series)I do consider Rigol as their products are siginificantly cheaper, but I'm in doubt with their equipment reliability.As I'm doing materials characterization in academic which involve a lot of low-level voltage/current measurement, I only give my trust to equipments from Keithley and HP/Agilent/Keysight.My experiments often require multiple instruments and DUT pins to be switched with high flexibility, e.g. Van der Pauw method, which requires to exchange voltage/current pins, differential configuration of 7012 card really helps.Is there any suggeted replacement to Keithley7001/7012 combination with reasonable price and adequate performance?

author: dietert1
author_rank: Super Contributor
timestamp: April 22, 2023, 04:47:26 pm
content: Recently we got a Keithley 3706 and a 3720 multiplexer (60x latching relays).Although it already has 15 years, it's like new and a nice instrument. It includes a 7.5 digit DMM with a large VFD display. Backplane and switching modules support multiple analog busses. Lots of computing power inside with Win CE and LUA script programming. With its six bays it provides up to 500 channels or so. The 3706A is a current model with improved firmware.I worked a bit on the backplane, soldering some of the press-fit socket pins. Also i moved the DMM analog bus tolow thermal EMF binding posts on the front. Yesterday i wrapped the wiring adapter to protect it from air draft. Now, while scanning in the 100 mV range the channel zero is stable with 7 nV standard deviation. Impressive.Regards, Dieter
Beckman Industrial / Wavetek DM93/95/97 multimeter schematic - Page 1
Forum section: electronics / testgear

author: seb30
author_rank: Contributor
timestamp: April 21, 2023, 12:58:13 pm
content: Hi,I am looking for DM93/95/97 schematic to fix my old DM95 !Regards.

author: coromonadalix
author_rank: Super Contributor
timestamp: April 22, 2023, 12:09:26 pm
content: If you open them and check the main Ic dmm chipset you may find useful references ...
HP 5372A opt. 040 - Page 1
Forum section: electronics / testgear

author: Capitan_Chaos
author_rank: Newbie
timestamp: December 27, 2020, 05:17:54 pm
content: Hello everybody,I would like to equip my HP 5372A with the 040 option, I believe that this option is only at the FW level (my version is 2947) but unfortunately for what I have searched on the net I have not found any information about it. Any of you have information about it?Greetings

author: mjames
author_rank: Newbie
timestamp: April 21, 2023, 08:57:07 pm
content: I have seen this option listed in various places but have never seen a machine that even had the label on the back to list it as a possibility.
LCR Meter To Measure Smd components  - Page 1
Forum section: electronics / testgear

author: elefurtronik
author_rank: Regular Contributor
timestamp: April 21, 2023, 11:19:53 am
content: Hello,I am looking for a very good quality LCR meter. I will use it to measure smd components especially the capacitors on the circuit.Please suggest me some LCR meters.

author: Grandchuck
author_rank: Super Contributor
timestamp: April 21, 2023, 11:25:38 am
content: Shannon tweezers are very good. Long thread here about them.

author: Psi
author_rank: Super Contributor
timestamp: April 21, 2023, 11:27:59 am
content: Quote from: elefurtronik on April 21, 2023, 11:19:53 amAre you sure you want an LCR meter and not an ESR meter?Some can do both but best to know what you want/need exactly.

author: elefurtronik
author_rank: Regular Contributor
timestamp: April 21, 2023, 11:41:41 am
content: Quote from: Psi on April 21, 2023, 11:27:59 amI have a PCB and there are capacitors on it and I would like to measure their values with LCR meter. I think LCR meters can also show ESR value of the capacitor.

author: pdenisowski
author_rank: Super Contributor
timestamp: April 21, 2023, 12:01:14 pm
content: Since quality is important to youhttps://www.rohde-schwarz.com/us/products/test-and-measurement/lcr-meters-and-impedance-analyzers_255440.html

author: elefurtronik
author_rank: Regular Contributor
timestamp: April 21, 2023, 12:20:14 pm
content: Thank you. I will check this device but it seems I can only measure the caps up to 40V. Or what is dc bias up to 40V?

author: pdenisowski
author_rank: Super Contributor
timestamp: April 21, 2023, 02:05:51 pm
content: Quote from: elefurtronik on April 21, 2023, 12:20:14 pmThe LCX can provide an external DC bias up to 40V (or an internally generated bias up to 10V). This is "added" to the test signal voltage, which has a frequency-dependent max value (but always < 10V)If you need to test caps at higher voltages, then the only thing we could offer is scopes and power supplies.

author: coromonadalix
author_rank: Super Contributor
timestamp: April 21, 2023, 02:57:26 pm
content: Don't forgetTesting caps in circuit has a limit, you may be influenced by other parts / circuit .... it as its limitsWhen you test some supplies or very low output impedance stuff, it get problematic, better remove the parts ...Done a few tests with the DE-5000 lcr in circuit and outside, and results differ greatly ....my 2 cents
Siglent SDS2102X plus hardware revision - Page 1
Forum section: electronics / testgear

author: Ricc
author_rank: Newbie
timestamp: April 20, 2023, 11:52:31 pm
content: Hello friends,, can you tell me the difference between hardware revision 02 and revision 04 of the siglent sds2102x plus oscilloscope?Seeing the firmware revisions speaks of a new hardware version 04.Thank you