hybridfree/eevblog-posts huggingface dataset:
JDSU JD745B mystery component - Page 1
Forum section: electronics / testgear

author: fred_
author_rank: Newbie
timestamp: March 19, 2025, 09:09:16 pm
content: Hi!I fixed a defected device by removing a 4-terminal QFN component of 2x2mm. The component has only the markings "BQ" and sits at the beginning of the signal path, right after an attenuator and before the first RF switch. It seems to have an input pin, output pin and is flanked by two internally connected ground pins and has label U52 in the photo. Any help IDing is much appreciated.Fred

author: xtech
author_rank: Regular Contributor
timestamp: March 19, 2025, 09:13:34 pm
content: SAW filter?!

author: nctnico
author_rank: Super Contributor
timestamp: March 19, 2025, 10:43:37 pm
content: My guess would be some kind of TVS diode to protect the input against ESD.

author: fred_
author_rank: Newbie
timestamp: March 20, 2025, 07:28:58 am
content: I'm going to add an overview of the complete RF in case this helps. The component sits at the top right and is marked by "?".After the connector we first have a decoupling cap, then a diode//resistor combo, then an attenuator of 2 dB IIRC and then my mystery.TVS ... makes sense.

author: picburner
author_rank: Frequent Contributor
timestamp: March 20, 2025, 06:29:23 pm
content: On the silkscreen it is labeled as "U52" so it should be an IC but for a search would need to know the type of case and from the photo I don't understand much.

author: TheSteve
author_rank: Unknown
timestamp: March 20, 2025, 08:29:33 pm
content: If you removed the device and it now operates can we assume there is a trace under U52 that connects the in to the out? If that is the case then it is a protection device most likely with diode(s) in it.

author: fred_
author_rank: Newbie
timestamp: March 21, 2025, 06:08:30 am
content: There’s a trace that connects the two ground pins (east and west). The input (north pin) and output are not connected. I bridged the gap with the decoupling cap behind it (C19) and shorted that gap with copper. This way I could measure the cap (33n) and not have to worry about that ground trace underneath it.

author: eb4fbz
author_rank: Regular Contributor
timestamp: March 21, 2025, 10:47:13 pm
content: It’s a limiter diode: Skyworks CLA4609-086LF

author: fred_
author_rank: Newbie
timestamp: March 22, 2025, 08:47:58 am
content: Quote from: eb4fbz on March 21, 2025, 10:47:13 pmYes! Thank you!
Rigol DS 5062CA - Page 1
Forum section: electronics / testgear

author: tszaboo
author_rank: Super Contributor
timestamp: March 19, 2025, 09:11:24 am
content: It's an old Rigol scope. I picked up it because I'm going to gift it to someone who is new in electronics, and it was at a very appealing price.I opened it up to see if there is anything concerning inside, bulging capacitors, rust or anything strange. None of that was visible, the scope looks like it hasn't been used for a while now. According to the date code it's from 2005. The UI reminds me of Tektronix TDS2000 series, the construction of the HP 54000 series. Big metal chassis inside, covered with plastic. Lot's of air inside.LCD is a bit washed out, the CCFL light has seen better days. One of the knobs seems to miss steps sometimes. I wanted to repair it but I found no obvious way to disassemble the front panel without breaking all the 20 year old plastic clips holding it. It gets more brittle over time.

author: tszaboo
author_rank: Super Contributor
timestamp: March 19, 2025, 09:20:01 am
content: Specifications:http://www.miko.hk/Rigol/DS5062CA.htmQuoteYeah 50GSPS sounds like bit of a marketing fail from a scope that doesn't work as a sampling oscilloscope. How did they come up with that number?Also something unique: Relays switch every time you change vertical range.

author: 2N3055
author_rank: Super Contributor
timestamp: March 19, 2025, 11:13:57 am
content: Quote from: tszaboo on March 19, 2025, 09:20:01 amThese old ones did have ETS mode. So 50GS/s is true sampling rate in ETS mode.
Anyone familiar with Anritsu MT1000A Network Master Pro? - Page 1
Forum section: electronics / testgear

author: litsnsirn
author_rank: Newbie
timestamp: March 13, 2025, 03:37:24 pm
content: I have a Anritsu MT1000A that I got some time ago for a project and then it sat in my truck. I thought I'd dig it back out when another project came up where I wanted to try and use it to help diagnose some ethernet issues. I have the MU100010A module, so I thought 'great, I finally already own something that I need, instead of constantly needing to buy something...' but it seems like maybe I've forgotten how to use it or maybe the previous owner didn't option it correctly when it was new. It looks like the only things that are functional are the OTDR portion, which is why I originally picked it up.Going off the system information, I have three modules in addition to the mainframe: MU100021A(OTDR), MU100040A(CPRI), and MU100010A(10G Multirate), but under the EEPROM Options for the MU100010A module, the only options that show up in green are MU100010A-071 CPRI dual channel up to 5G and -072 6G-10G single channel. So, that leads me to believe that I am hosed. Is there anywhere that I can still obtain options for this? I have to think that since it is obsolete, Anritsu probably will want to sell me a new piece of equipment, instead of support the obsolete hardware, at which point, I would look for a new used piece of equipment. I don't know how the licensing/options on these work, say for instance, am I likely to find someone that has unused license or option keys that I could buy and install or is that not how these systems are expanded. I haven't found a lot of information online about these and was hoping to try and run across someone that might know.TIA

author: metrologist
author_rank: Super Contributor
timestamp: March 17, 2025, 07:21:04 pm
content: Did you look at the latest product datasheet? While MU100010A has been superseded by MU100010A1, most of the options could be retrofitted later. You would have to contact a service center in your region for details.Note that the MT1000A is a Japan division product. The MU100040A module was a joint project with the US division and Japan, but did not catch on. Americas service typically goes to the California (US division) location, but is still serviced by the Japan division operatives.
Agilent 54622A continuous reset problem - Page 1
Forum section: electronics / testgear

author: Bobhert1
author_rank: Newbie
timestamp: March 16, 2025, 08:46:33 pm
content: I have a 54622A that goes through the bootup sequence until the relays start to click, then resets. The serial port is transmitting the startup status, screenshot attached. Does anyone have any idea why the reset would occur after the message "could not set ch1 gain vernier, gain=0.44"? It doesn't appear to be a software or battery issue, and I reloaded the firmware successfully. It doesn't seem to be the power supply because I powered it up with a known good supply from another unit and got the same results, just an endless cycle of resets.Executing startup sequence:I/O hardware ... okSystem services ... okCode Local build, Oct 23 2003 17:42:33Directory: /col/scopes/jediPlus2/projMuskratInstrument id instType = 0x1, a Muskrat 2 channel, 54622ALow level measurement hardware ... okSettling manager ... okChannel driver ... okTrigger driver ... okDisplay driver ... okTimebase driver ... okAcquisition driver ... okPlot driver ... okSystem scheduler ... okADC scanner ... okBattery ... okReal time clock ... okCal factors and periodic compensation ... okLocal user interface ... okControl system ... okOS services ... okOS processes ... okInterrupt service ... okFile system ... okSelf test initialization ... okText system ... okUser interface enable ... okStartup sequence is completecould not set ch1 gain vernier, gain = 0.44(this is where the reset happens and it cycles through over and over)Thanks
Two Questions about SDG1064X - Page 1
Forum section: electronics / testgear

author: watchmaker
author_rank: Unknown
timestamp: March 17, 2025, 02:58:54 pm
content: Two questions regarding the SDG1064X.Is there a mechanism to ensure the generator is at factory default?Second regards using the sweep function. I am not successful in creating an "S" signal for aligning FM. (Developing a STEM program around this).The Elenco instructions just say set the Sweep to 10.7 MHz. I tried using Ch 2 for trigger output and also just triggering off Ch 1. Played with sweep times and got a stable signal with 1Hz sweep. BUt I really am not getting this.I have no problems with FM Modulation at 10.7 MHz and can do the alignment with the kids that way; but I would like to understand how to get "S" curve.THANKS!

author: tautech
author_rank: Super Contributor
timestamp: March 17, 2025, 03:31:09 pm
content: Quote from: watchmaker on March 17, 2025, 02:58:54 pmGetting the model correct might help with getting info.SDG1062XMain thread:https://www.eevblog.com/forum/testgear/siglent-sdg1000x-waveform-generators/QuoteSure there is, 2 methods actually.P80 2.13.1 System Settingshttps://siglentna.com/wp-content/uploads/dlm_uploads/2024/08/SDG1000X_UserManual_UM0201X-E01H.pdfUtility>System>PowerOn = Default or Last (used settings)Default = All the settings return to default when power on.Last = All the settings return to the setting of last power on.ORUtility>System>Default = Set all the settings to default.
Anyone recognise this socket? - Page 1
Forum section: electronics / testgear

author: Mad Axeman
author_rank: Contributor
timestamp: March 14, 2025, 08:03:06 pm
content: Does anyone know what type of socket this is? It's used by Seaward on some of their PATesters. This one is an Apollo 600. I need to make up a lead for a specific job and can't find the plug anywhere. I'm hoping it's not something that's unique to Seaward.

author: joeqsmith
author_rank: Super Contributor
timestamp: March 14, 2025, 08:57:05 pm
content: Looks familiar.

author: artag
author_rank: Super Contributor
timestamp: March 14, 2025, 09:48:19 pm
content: Looks a bit like the power connectors on old (military ?) radios.But is it this ?https://www.jniconconnector.com/sale-11440055-outdoor-electrical-power-connectors-3-pin-national-street-lights-standard.htmlBoth of those, though, I think have a screw retention housing

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: March 14, 2025, 10:28:59 pm
content: Megger uses the same connector for theirRCD testers.But no idea who's the manufacturer.

author: Mad Axeman
author_rank: Contributor
timestamp: March 14, 2025, 10:50:21 pm
content: The Jnicon look like they may fit but depends if the screw section can be removed. Also I can't find a supplier to the UK that doesn't want a minimum order of 100 :-(The Megger leads look like the same plug but at £47 seems to expensive to buy only to chop up or to find it's a moulded on plug. If both Seaward and Megger are using them then it must be a recognised plug and not just a one off.

author: benj38
author_rank: Frequent Contributor
timestamp: March 15, 2025, 11:59:14 am
content: This one is only about 20 pounds including VAT, so maybe worth a try:https://www.tester.co.uk/megger-uk-mains-plug-leadset-3-pin-1-wire

author: Neilm
author_rank: Super Contributor
timestamp: March 15, 2025, 07:58:52 pm
content: The Megger leads are molded. Also, depending which you get some have a flat side to key it, another has two flat sides to stop you plugging it into the other socket.FYI, the pins in those are not standard 3 mm or 4 mm pins (2 mm or 2.5 mm from memory)

author: Mad Axeman
author_rank: Contributor
timestamp: March 16, 2025, 04:06:39 pm
content: The Megger lead is moulded on so making up a lead would mean chopping and heat shrinking. It wouldn't look good to the customer.I've just taken a close look at the Apollo and the plug with that does have 'Seaward' moulded into it so perhaps it's not available elsewhere. I would be happy to be proved wrong though :-)
New Tektronix Scope Leaked by Tektronix Employee? - Page 1
Forum section: electronics / testgear

author: EEgang
author_rank: Newbie
timestamp: March 15, 2025, 10:45:17 pm
content: Was posted here and then removed from the post later in the same day.....https://www.linkedin.com/posts/josephxwang_tektronix-leadership-growthmindset-activity-7302526098548928512-FcZ3?utm_source=share&utm_medium=member_desktop&rcm=ACoAABngRR4BFLxCM_IDIHBlrL4aP9G4-d2PlTw

author: coppercone2
author_rank: Super Contributor
timestamp: March 15, 2025, 11:11:58 pm
content: did they change the probes again?

author: 44kgk1lkf6u
author_rank: Regular Contributor
timestamp: March 16, 2025, 12:46:54 am
content: If you are talking about the connectors on the rightmost oscilloscope in the picture, it seems to use the TekConnect interface. It uses BMA for the signal. It is in use since at least the fast models in the TDS6000 series. They sell adapters for connecting BNC, SMA, and N to it. They have a black face and a screw in the lower left corner. The oscilloscope seems to have 5 of them installed. That is an odd number however.https://w140.com/tekwiki/wiki/TekConnect_connector

author: coppercone2
author_rank: Super Contributor
timestamp: March 16, 2025, 12:48:29 am
content: you could be right, I thought it was more of a 1 shape then the b shape in the picture
Tektronics 2430 O-scope CRT display Troubleshooting - Page 1
Forum section: electronics / testgear

author: Craftsman
author_rank: Newbie
timestamp: February 16, 2025, 12:24:14 am
content: I'm in the process of getting an old 2430 back up and running. Initially, the Keeper battery needed to be replaced so I replaced it with a Saft 14250 with a holder. But when I booted it back up after the battery replacement, the display shrank and shifted upwards so that only the top half of the CRT is being used and the focus isn't all that sharp as well.Seeing that it's an old scope and many have suggested that they need to be recapped, I was wondering if this is an indication of a need to recap this scope or is there an adjustment I missed?Thanks

author: David Hess
author_rank: Super Contributor
timestamp: February 17, 2025, 03:19:39 am
content: Make sure that a lead connecting to the CRT did not fall off.

author: Craftsman
author_rank: Newbie
timestamp: March 15, 2025, 11:47:10 pm
content: Thanks for the reply.I finally had a chance to take the scope apart again to look at the connections. All of them seem to be connected and nothing is loose.Upon powering the scope back up, I could swear that the display drifted a bit more to the upper part of the screen.

author: David Hess
author_rank: Super Contributor
timestamp: March 16, 2025, 12:34:17 am
content: After inspection, the place to start is to measure the levels and noise of the power supply voltages.
Racal 04E/9462 OCXO adjustment hole cover screws - Page 1
Forum section: electronics / testgear

author: Spike
author_rank: Regular Contributor
timestamp: March 13, 2025, 11:09:17 pm
content: Hi,I recently purchased one of these on eBay and it did not have the pan head adjustment cover screws that I have commonly seen on these units as pictured here:Does anyone have any information about these screws so that I can source some replacements?I'd be grateful if anyone could tell me at things like thread size & pitch as well as screw length and head size.

author: George Edmonds
author_rank: Frequent Contributor
timestamp: March 13, 2025, 11:26:33 pm
content: HiIt should NOT have the screws,just tape over the holes or use a calibration sticker.G Edmonds, Joint owner of the Racal Dana support group

author: edpalmer42
author_rank: Super Contributor
timestamp: March 14, 2025, 12:33:18 am
content: Quote from: George Edmonds on March 13, 2025, 11:26:33 pmWhy not, George? Those screws are very common on a variety of different brands. I've never seen anything about removing them.Spike, those screws are rather special. I don't know what the thread is, but on the underside of the head there's a rubber O-ring embedded into a groove. When you screw it down, the O-ring seals the screw hole. I've never seen those screws for sale.

author: factory
author_rank: Super Contributor
timestamp: March 15, 2025, 09:07:32 pm
content: Quote from: George Edmonds on March 13, 2025, 11:26:33 pmLooking up the part number it seems to be used in the Racal Dana 1992, the US made ones seem to have those screws (as does old Systron stuff), the one on feePay UK that claims to be UK made has a cal sticker instead.David

author: edpalmer42
author_rank: Super Contributor
timestamp: March 15, 2025, 09:48:33 pm
content: Quote from: factory on March 15, 2025, 09:07:32 pmYes, I've seen many oscillators with threaded holes, but no screws. I always assumed that the screws just got lost or forgotten. I've also seen cal stickers applied over top of the screws. I've never seen anything that said they should be removed. For example, maybe they were just for shipping. But that doesn't make sense to me. Why go to the effort of threading the holes and using special screws? It would make more sense for the factory to leave the holes unthreaded and then slap a label over the holes and print 'Remove before use' on the label. I can't think of any other possible reasons to remove them.
TL631 Pro instructions - Page 1
Forum section: electronics / testgear

author: MarkC
author_rank: Newbie
timestamp: March 15, 2025, 03:51:38 pm
content: I have repaired many older PC motherboards and found my POST code reader very useful. As I am now repairing some newer motherboards I purchased a TL631 Pro but it comes with no instructions.My old POST code reader was either PCI or ISA and just plugged it in. This new tool has multiple extra ports and flying leads to use on some motherboards but zero instructions. Does anyone have a link to a guide or a few pointers? Thanks.
DS1102Z-E Stuck on boot menu - Page 1
Forum section: electronics / testgear

author: ubata
author_rank: Contributor
timestamp: February 25, 2025, 04:32:53 pm
content: HiDSO1102Z-E stuck on boot screen. please help to fix.how can I log the boot using serial or jtag? Do I need a NAND dump to reprogramming NAND memory? Does Rigol have a download mode? I already reprogrammed a Hantek scope using download mode andsome *.bin filesthat the factory had sent it to me. Is there such a method for a Rigol?thanks

author: valcher
author_rank: Contributor
timestamp: March 10, 2025, 01:14:09 pm
content: Hi.If your request is still relevant, try this method.This method is described somewhere on this forum.1. Write the oscilloscope firmware to a clean USB-Flash (USB-Flash - 2 GB, FAT32 format).2. Insert into the oscilloscope.3. Apply power to the oscilloscope, and after a short beep, quickly press the HELP button 3 times.

author: ubata
author_rank: Contributor
timestamp: March 14, 2025, 03:29:47 pm
content: Quote from: valcher on March 10, 2025, 01:14:09 pmHi.I tried that method. but not fixed. after updating the firmware the scope still not boot.thanks

author: valcher
author_rank: Contributor
timestamp: March 14, 2025, 10:10:57 pm
content: Hi.I had a similar situation with my Rigol ds1102z-e as you, I was in complete despair, didn't know what to do, until I found these posts -https://www.eevblog.com/forum/testgear/new-rigol-ds1054z-oscilloscope/msg3608676/#msg3608676See if I missed something.
Good Function generator for alining FM and AM receivers UNI-T VS Siglent? - Page 1
Forum section: electronics / testgear

author: RiRaRi
author_rank: Regular Contributor
timestamp: March 14, 2025, 04:03:17 pm
content: Hello. As i am on my learning path to master servicing radio receivers (at least simpler ones)i would like to invest in proper function generator which could be good both for learning and in future to service. I am looking on 120 MHz Siglent SDG2122X and UNI-T UTG2122B. I know Siglent is better brand but UNI-T as far as my knowledge go, can do same things. Which one would you recommend and does Siglent one has something UNI-T does not have?

author: bdunham7
author_rank: Super Contributor
timestamp: March 14, 2025, 04:41:18 pm
content: I have the Siglent and IMO it is generally sufficient for anything other than perhaps some extreme narrowband or specialty applications that require atomic-clock level precision or some special feature set. You will need a set of attenuators because it really doesn't work below -30dBm or so. It also only displays the output in voltage, so you'll need to do the math. Specifically for FM stereo receivers, you can directly enter the pilot tone modulation at 19kHz and 6.75kHz FM deviation but I have not figured out a clever way to simulate actual L/R multiplexed signals. I suspect it could be done with a carefully constructed ARB waveform used as the modulation.IDK about the Uni-T, haven't seen one.

author: hfleming
author_rank: Regular Contributor
timestamp: March 14, 2025, 05:18:40 pm
content: Quote from: bdunham7 on March 14, 2025, 04:41:18 pmAbout stereo FM, siglent has a link to an application:https://siglentna.com/application-note/baltic-labs-generate-a-stereo-fm-multiplex-waveform-with-python-and-awg/

author: tautech
author_rank: Super Contributor
timestamp: March 14, 2025, 07:33:38 pm
content: Quote from: bdunham7 on March 14, 2025, 04:41:18 pmWhen the the output is changed from HiZ to 50 Ohm you get the option to select dB.Fact is, output is always 50 Ohm impedance and only the display/set values get changed to match the output impedance setting.

author: bdunham7
author_rank: Super Contributor
timestamp: March 14, 2025, 08:18:37 pm
content: Quote from: tautech on March 14, 2025, 07:33:38 pmNever noticed that....or I forgot about it. Either way, there it is and reasonably accurate too, maybe +/- 0.5dB. However, the radios in question likely aren't 50R input so you'd either have to use very short cables or obtain/make a set of matching pads and then do some math. Fory typical FM receivers I think a 50R to 75R pad with -6dB is easily made. IDK about a 50R to 300R balun.Also, receiver specs are often in µV anyway, so the dBm-to-volts math is needed when you are looking at your spectrum analyzer or FFT and a radio.
Hp 1660e Disc images - Page 1
Forum section: electronics / testgear

author: jbrx
author_rank: Newbie
timestamp: March 13, 2025, 08:59:42 pm
content: Can anyone help me locate disc images for the HP 1660e logic analyzer.Keysight has 1660a,1660C and 1670G but no 1660e that I can see.Thanks.

author: aeg
author_rank: Regular Contributor
timestamp: March 13, 2025, 11:36:10 pm
content: This is what was on HP's FTP site 25 years ago. I think it's V02.02. I don't know if there was a later version. I believe the files in "sysdisk1" and "sysdisk2" are each to be copied to a 1440k FAT12 floppy - not LIF.

author: jbrx
author_rank: Newbie
timestamp: March 14, 2025, 12:44:19 am
content: Thats exactly what I need.Many thanks.
Programmable resistance decade? - Page 1
Forum section: electronics / testgear

author: Per Westermark
author_rank: Contributor
timestamp: March 13, 2025, 07:55:11 pm
content: I'm looking if there are any computer-controllable resistance decade that isn't extremely expensive.I have lots and lots of measurements I need to do to create calibration curves for a number of devices, and it's very boring to test and measure 50-100 resistances per input for x inputs multiplied by y different units. But I'm not fully desperate enough to add stepper motors on one of my manual decades.I mainly need 10 ohm to 20 kohm range.Precision isn't that important - only reasonable repeatability. I can have my multimeter sample the individual resistance values beforehand.No need to handle high voltages - the equipment I will work with will not emit over 10 V.

author: NANOJOLTS
author_rank: Contributor
timestamp: March 13, 2025, 09:07:34 pm
content: There's a, IET Labs PRS-B-6-0.01-IEEE.2-D-R Programmable Resistance Substituter Decade.On flea-bay. Two units in one, GPIB control.LMK if that helps.

author: H.O
author_rank: Frequent Contributor
timestamp: March 13, 2025, 09:26:36 pm
content: Side project? Someone built one a while back, I'm sure there's a thread on here somewhere but here it is on Hackaday:https://hackaday.io/project/191969-programmable-precision-resistorVery nice looking instrument.

author: ledtester
author_rank: Super Contributor
timestamp: March 13, 2025, 09:50:32 pm
content: On Tindie there is the "QR101T" which was a Kickstarter campaign:https://www.tindie.com/products/eastwood/qr10-pocket-programmable-resistance-box-qr101t/https://www.kickstarter.com/projects/eastwoodtech/qr10-pocket-high-accuracy-programmable-resistance-boxA little cheaper is this:https://www.tindie.com/products/eastwood/rm550-005-accuracy-res-module-with-iso-rs485/Quote from: H.O on March 13, 2025, 09:26:36 pmHere's an EEVblog thread about this unit:https://www.eevblog.com/forum/projects/a-scpi-programmable-(precision)-resistor/

author: Per Westermark
author_rank: Contributor
timestamp: March 13, 2025, 10:35:26 pm
content: Both the Tindie alternatives looks very promising, and with a price that I could buy one of each.Making 50 measurements times 10 inputs could be done in just a few minutes with no intervention from me - just a relay board to automatically switch between the different inputs to calibrate. Way more fun than spending a full day of manual measurement just to verify a prototype.And even if they possibly overpromise on precision, I can self-calibrate using my Keithley DMM6500.
New DMM/DSO, Aneng AOS04, 1ch 10MHz/50MSps (March 2025) - Page 1
Forum section: electronics / testgear

author: tunk
author_rank: Super Contributor
timestamp: March 07, 2025, 06:13:16 pm
content: Are we getting fed up with all these new low end devices:- 10MHz/50MSps- 10mV - 10V/div- 5ns - 10s/div- BNC- DMM 10000 count- 3.2" screen, 320x240- size 190x91x50mm, weight 367g- price from around US$55- similar specs to the AOS02https://www.aliexpress.com/item/1005008453190582.html

author: Fungus
author_rank: Super Contributor
timestamp: March 07, 2025, 07:40:38 pm
content: Seems expensive for the specs. And big - takes up a lot of space compared to a Zeweii.

author: tunk
author_rank: Super Contributor
timestamp: March 09, 2025, 03:47:00 pm
content: Looks like it's also sold as the Winapex 810B.A generally positive video review, including teardown (GD32F407+MTX2088), no bandwidth test though:https://youtu.be/URSPrMS-_yAEdit: Scanning through this video, it does show 10MHz (a bit wobbly):https://youtu.be/Zj6M2rcAciU

author: OLderDan
author_rank: Regular Contributor
timestamp: March 09, 2025, 07:31:15 pm
content: I literally just watched that you tube video... I think Darren has the best videos and I watch them even for products that don't interest me, just for his particular style of fun!

author: ME
author_rank: Frequent Contributor
timestamp: March 10, 2025, 01:58:37 am
content: just looked this up on ali, One pic shows them probing a mains power strip, Funny tho as the trace shown is a square wave!.

author: tunk
author_rank: Super Contributor
timestamp: March 13, 2025, 02:46:02 pm
content: A screen dump of the PCB from Darren Walker's video.
Brymen 867s Display contrast - Page 1
Forum section: electronics / testgear

author: katerle
author_rank: Contributor
timestamp: March 16, 2025, 11:13:46 am
content: Hi,relating on this post:https://www.eevblog.com/forum/testgear/eevblog-brymen-bm235-lcd-issues-or-normalmy question is, ist there meanwhile a solution to make the contrast stronger, it's not good visible in the normal angles. My newer BM869s has wonderful contast, the 867s is about 8 till 10 years old.The zebras etc. I have cleand, fresh batteries, no change.Thanks!
REsistance box Biddle? - Page 1
Forum section: electronics / testgear

author: NANOJOLTS
author_rank: Contributor
timestamp: March 11, 2025, 11:36:57 pm
content: Hey there, anyone have an idea what (internal S or A) means? First photo.Third photo, Four wire and a GNDThanks

author: Fungus
author_rank: Super Contributor
timestamp: March 12, 2025, 09:54:26 am
content: That's obviously been hacked, no way to tell what's going on inside from just looking at a photo of the box.Time to take it apart...

author: Shock
author_rank: Super Contributor
timestamp: March 12, 2025, 06:44:29 pm
content: Internal Standard or Accuracy/Application/Adjustment/Alignment?
Rigol MSO5354 + BND5000  - Page 1
Forum section: electronics / testgear

author: Maurobul
author_rank: Newbie
timestamp: March 12, 2025, 12:28:22 pm
content: Good morning, I purchased a Rigol MSO5354 + full option package. I find a noise on the lines of about 2-3 mV in absence of signal, with grounded probes. Rigol Italy answers me that it is normal because it is due to the high resolution. But on none of my oscilloscopes have I ever detected this noise, not on the Tektronix, not on the LeCroy, not even on an old Rigol DS1100E.Has anyone had similar problems? I believe it may be due to a problem on the power supplies.I kindly thank you for any response.Translated with DeepL.com (free version)
TOPDON TC004 SE any good? - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: March 11, 2025, 08:35:34 am
content: Good morningJust saw that Elektor has an offer for the TOPDON TC004 SE thermal imaging camera.Anyone using this model?Price wise it is around the same as the FLIR TG165-X, but the FLIR has a much smaller IR resolution of 80x60 whereas the TC004 SE has a resolution of 256x192.Main usage will be thermal measurements of PCBs with power electronics.

author: thm_w
author_rank: Super Contributor
timestamp: March 11, 2025, 10:33:33 pm
content: https://www.eevblog.com/forum/thermal-imaging/vevor-sc240n-topdon-tc004-infiray-c200-hisilicon-hi3516dv300/
Fluke PM6304 DC bias for inductance? - Page 1
Forum section: electronics / testgear

author: murrayatuptown
author_rank: Contributor
timestamp: March 14, 2025, 01:43:36 am
content: Hello:0) I searched for this & found nothing.1) User manual discusses using internal 2 V or external (up to 40V) DC bias for testing electrolytic capacitors.Does anyone know if this function is available for measuring inductance with a DC bias (is the DC applied regardless of impedance of D.U.T.)?I would assume it is when the bias is turned on, but would appreciate hearing from someone who has measured DC-biased inductance.Thank youMurray
FieldFox License Tool - Page 1
Forum section: electronics / testgear

author: ilion17
author_rank: Newbie
timestamp: March 10, 2025, 10:24:18 am
content: I need a program that can do option hacking for R&S and Keysight.I am willing to pay someone who can provide or teach this program.

author: Halcyon
author_rank: Unknown
timestamp: March 10, 2025, 10:39:45 am
content: So you want someone to completely reverse engineer several products and develop a clone of the FieldFox tool? Good luck.

author: ilion17
author_rank: Newbie
timestamp: March 10, 2025, 10:42:18 am
content: They already did this. I saw it in a few places. I just want to get it too.
C.A. 5275 [Chauvin Arnoux] digital multimeter (teardown and minor repair) - Page 1
Forum section: electronics / testgear

author: Nifty
author_rank: Contributor
timestamp: September 27, 2022, 06:36:57 pm
content: Background: Two weeks ago, on a local FB market I saw a digital multimeter "C.A. 5275". During this time, the price was reduced from 200 to 75 eurosapparently, this brand is not very popular in our area. Comes with original probes and holster. Because the price was quite low and I never had a "Chauvin Arnoux" (or Metrix) multimeter (is anyone had?), I bought it out of curiosity.The seller was in another city, so I couldn't test the multimeter.Given the seller's strange Facebook profile, I resigned myself to the fact that I might not receive anything or something was wrong with the multimeterIn my multimeter, both fuses (630mA and 10A) were blown. After replacement, everything works. Extra 15 euros for fusesDuring disassembly, I paid attention to the rigid connection of the probe terminals to the PCB. And (surprise, surprise) the common terminal was already loose. I had to solder it more securely. You shouldn't do this, if the PCB is in the case, the plastic bushings of the terminals melt very quickly.Like:The original probes are modular, quite long (1.5 m) with silicone wires.Nice backlight."OFF" position on both sides! Yeah baby!Do not like:Not the fastest continuity measurement.Flimsy mode switch.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 27, 2022, 07:14:15 pm
content: the pic 18f used as a display driver ??

author: Nifty
author_rank: Contributor
timestamp: September 27, 2022, 08:23:05 pm
content: Quote from: coromonadalix on September 27, 2022, 07:14:15 pmYes, sir!PIC18F85J90* An integrated LCD driver module, capable of driving 48 segments and 4 commons for LCD display* Integrated LCD Voltage Boost Regulator

author: tppc
author_rank: Regular Contributor
timestamp: March 09, 2025, 01:38:02 pm
content: Hi all,Yes, I know this topic is over 2 years old.Nevertheless, to me, it seems more apropriate to keep all information about this exact same DMM model concentrated in one single location, instead of splitting it over various threads.I salvaged the same DMM from a dumpster. It is fully functional, except for current measurements.(Both fuses blown and some shunts carbonised).If need the values of the 2 resistors and the references for the 2 SOT23-6 chips.I found another picture which unfortunately does not help much...I can read 11DAF on the SOT23-6 chips.Probably a dual MOSFET, but I could not find anything about the code 11DAF.From the first picture, I can guess4.64 Ohms for the first resistor4.12 Ohmsfor the second oneFrom the second picture, I would guess4.64 Ohms for the first resistor4.02 Ohmsor 4.12 Ohmsfor the second oneCan anyone help me repairing this DMM?Kind Regards
GN Navtel RISC 9470 protocol analyzer manuals request. Where to find? 9440 maybe - Page 1
Forum section: electronics / testgear

author: wilfred
author_rank: Super Contributor
timestamp: April 10, 2018, 05:42:50 am
content: Does anyone know where manuals can be found?I went through the link thread in the repair board and found nothing. Searches don't turn up anything.

author: wilfred
author_rank: Super Contributor
timestamp: April 14, 2018, 12:26:48 pm
content: OK. Not surprising no-one has anything.I changed the title to aid any future tragic. I found a service manual for the 9440 model which may have some cross-over to the 9470 and 9460.https://www.aef.se/Instrumentmuseum/Instrumentportal_ny/Dokument/Enstaka/9440_Protokollanalysator.pdfThose who maintain FTP manuals sites might want to snaffle a copy and change the pdf name to English. Although Google still managed to find this one for me.I still can't find floppy disk images but one of the differences of the 9470 model is a HDD. So When I get it working I may be able to format a floppy from the HDD. It did work for long enough to boot up. But then the Schaffner IEC mains filter let out the stink. Probably a RIFA inside.Even with my limited experience I should have known better. Old test equipment, not powered on for 10 years (or more) Phzzzt Phzzt stink.I'm not actually going to use the thing but I thought it might make an interesting case for a Z80 computer project. It has a fold down keyboard and little built in green screen CRT, a floppy drive and a handy soft pouch for stuff on the top. And a power supply.

author: Beachgal505
author_rank: Newbie
timestamp: September 26, 2019, 07:31:53 pm
content: Hello Wilfred. I just joined this blog today. Fortunately, I DO have the Operating Guide for the GN Navtel 9470. I also have the Protocol Analyzer itself along with all the computer software floppies for operation. Are you still in need of any of this I mentioned? I realize your last post was in 2018 and your situation might have changed since then. If interested, please don't hesitate to reply. Thank you.

author: wilfred
author_rank: Super Contributor
timestamp: September 27, 2019, 12:05:32 am
content: Thanks for the reply.I'll PM you.

author: skelband
author_rank: Newbie
timestamp: June 27, 2023, 07:12:12 pm
content: Hi,I also have acquired one of these machines (9470) but it comes with no floppies or manuals. Does power up though and seems to be electronically safe (until a cap gives out at least).Would anybody be able to point me in the direction of any floppy images and/or manuals for it?The link given above seems to be dead.Cheers,skelband

author: ehobby
author_rank: Contributor
timestamp: March 09, 2025, 07:12:31 am
content: I am also looking for manuals and any software for this analyzer. I am willing to scan/OCR the manual, or other docs, if necessary. Seems there are still some people that have these.
Hioki 3166 clamp on power analyser - Page 1
Forum section: electronics / testgear

author: Squarewave
author_rank: Frequent Contributor
timestamp: March 08, 2025, 07:50:38 pm
content: I wonder if anyone here has the Hioki 3166 clamp on power analyser and the floppy disk drive unit? If so, do you have the software for Windows to read the log files which are saved to disk? Thanks.
Agilent 54622A - Page 1
Forum section: electronics / testgear

author: Bobhert1
author_rank: Newbie
timestamp: March 07, 2025, 04:19:46 pm
content: I have an Agilent 54622A that won’t boot up. It gets into what appears to be a continuous loop of resets. When switched on, I hear relay clicks, the pulse button lights, then more clicks and the “more” button lights, then it repeats on and on. If I put a floppy in the drive, it appears to access the drive for a second before the relays click, and that becomes part of the repeating cycle. Has anyone seen this before? Any thought?Thanks

author: benj38
author_rank: Frequent Contributor
timestamp: March 07, 2025, 05:06:08 pm
content: I would start by checking all power supply voltages are as expected.

author: dimmog
author_rank: Regular Contributor
timestamp: March 07, 2025, 07:29:19 pm
content: Most likely, the Flash memory is corrupted. In some cases, inserting a floppy with the firmware file in the root directory can restore it.

author: Bobhert1
author_rank: Newbie
timestamp: March 08, 2025, 04:29:49 pm
content: That was my thought as well, so I powered it up with a known good supply and got the same results. Thanks.

author: Bobhert1
author_rank: Newbie
timestamp: March 08, 2025, 04:33:07 pm
content: I tried putting the firmware file on a floppy and then turning it on. It appeared to try to read the floppy, then stopped, cycled the relays, and repeated the same thing over and over.

author: Bobhert1
author_rank: Newbie
timestamp: March 08, 2025, 06:24:31 pm
content: I found some instructions on Keysight’s site that said to press Utility and Save/recall prior to power up. This caused the scope to actually read the disk for a few minutes, and I was hoping for success. Unfortunately, after completing the disk read it just reset and continued to do so. Trying to decide if I want to kiss this thing goodbye or try to find a new system board
Test Equipment and Scripts, how do you implement them? - Page 1
Forum section: electronics / testgear

author: Nick Heidl
author_rank: Newbie
timestamp: June 29, 2022, 04:26:48 am
content: I have a Korad KEL103 Programmable DC Electronic Load and it can be controlled by scripts. However, I have no clue how to do this. Not so much how to make a script but how to implement it is what I would like to learn first. There are scripts for it already thanks to Reiner Schmidt on YouTube but I don't know what to do. I have found them on GitHub but then what?

author: ledtester
author_rank: Super Contributor
timestamp: June 29, 2022, 10:37:54 am
content: Are these the scripts?https://github.com/Mango-kid/py-koradThis library communicates with the KEL103 over ethernet/WiFi. The simplest example is the dynamicMode.py script in the examples directory. To make it work you have to change line 7 with the ip addresses of your computer and the KEL103. When you run it should print "Changing mode to dynamic" and set up a dynamic CC profile as specified on line 18.Another script which communicates with the KEL103 over the serial port is located here:https://github.com/MillicentMaina/Kel103.py/blob/main/kel103%20(5).pyIn this case you have to change line 11 to match the serial device of the KEL103. This script was written on a Linux machine but should work under Windows if you set 'device =' to the right COM port.

author: Nick Heidl
author_rank: Newbie
timestamp: June 30, 2022, 12:33:15 pm
content: Hi, yes Mango Kid are the scripts I was looking at. But how do you run a script?

author: wasedadoc
author_rank: Super Contributor
timestamp: June 30, 2022, 03:46:54 pm
content: Quote from: Nick Heidl on June 30, 2022, 12:33:15 pmScripts with a ".py" extension are python programs. Use your favourite search engine to find how to run python programs on whatever computer and OS you are using. You many need to first install Python.

author: Smokey
author_rank: Super Contributor
timestamp: March 09, 2025, 11:33:12 pm
content: If you are using ethernet, maybe this would be helpful getting that set up:https://www.eevblog.com/forum/testgear/korad-kwr102-power-supply/msg5843157/#msg5843157
New handheld 3.5" DSO/DMM, Alientek DM40, 1ch 10MHz/50MSps (March 2025) - Page 1
Forum section: electronics / testgear

author: tunk
author_rank: Super Contributor
timestamp: March 06, 2025, 03:17:54 pm
content: Deleted.And sorry, as pointed out by DaneLaw below, there's already a thread about this.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: March 06, 2025, 03:29:36 pm
content: already a thread from a few months back with all the details and videohttps://www.eevblog.com/forum/testgear/alientek-dm40c-multimeter-(dm40a-dm40b-dm40c)/msg5766389/#msg5766389
DSO2D15 - auto set - Page 1
Forum section: electronics / testgear

author: yanivf
author_rank: Newbie
timestamp: March 07, 2025, 02:12:22 am
content: I'm newbie and just got hantek dso2d15 oscilloscope. Aside of basic issues I found like it hanging during saving csv file. I am not sure if the auto-set behaving as expected. I connected both channels to the build-in signal (5vpp @ 1khz) and both are showing fine. When I click on auto-set, I expected it to align the two signals one below the other but instead it changed the scale and caused the signals to overlap. I also noticed that after hitting the auto-set, I need to go back to the horizontal menu and change the type back to rolling as it changes it to yt.Below is a link to a clip showing what happens when I click auto-set.https://1drv.ms/v/s!AoIrlVDr4zCPpoh-s4WDcQKd9zdJvw?e=VzJmh2

author: OLderDan
author_rank: Regular Contributor
timestamp: March 07, 2025, 03:59:49 am
content: prob post herehttps://www.eevblog.com/forum/testgear/hantek-dso2x1x-models-master-thread/

author: wasedadoc
author_rank: Super Contributor
timestamp: March 07, 2025, 07:24:36 pm
content: yt (not rolling) mode would be my initial choice for viewing a 1 kHz signal.
Fluke 8840a fuse holder #516039 - Page 1
Forum section: electronics / testgear

author: br4n_d0n
author_rank: Contributor
timestamp: April 30, 2023, 08:46:24 pm
content: Anyone have one of these fuse holders they can take measurements of so I can 3D print it?I'm also willing to purchase one for a reasonable price.

author: lowimpedance
author_rank: Super Contributor
timestamp: May 01, 2023, 02:43:46 am
content: Quote from: br4n_d0n on April 30, 2023, 08:46:24 pmAttached are the measurements on my 8840a fuse holder.All measurements in mm, some I'm sure you could round up/down some of them no issue.Actual pictures are on line (found one ebay seller selling various parts with a picture of one, out of stock of course!)You will have to find a way to incorporate a suitable banana socket with a cup at the rear to take the appropriate fuse.The locking lugs are part of the moulding and have a dovetail shape .If you do make a 3D model can you add it to the thread,https://www.eevblog.com/forum/testgear/replacement-knobs-feet-and-fittings-for-test-equipment/

author: br4n_d0n
author_rank: Contributor
timestamp: May 01, 2023, 04:16:55 am
content: Thank you for sharing this and if I do end up making a functional part, I'll definitely share it.

author: DeepLink
author_rank: Regular Contributor
timestamp: March 06, 2025, 11:50:53 am
content: Did you manage to make a 3D print of it?If so - will you share your file?

author: benj38
author_rank: Frequent Contributor
timestamp: March 06, 2025, 07:19:37 pm
content: @DeepLink, I am afraid br4n_d0n was last seen on this forum on October 29, 2023
New handheld DSO, Fnirsi DS215H, 2ch, 50MHz/250MSps (March 2025) - Page 1
Forum section: electronics / testgear

author: tunk
author_rank: Super Contributor
timestamp: March 05, 2025, 03:37:52 pm
content: - claimed 50MHz, 250MSps- 20ns/div - 20s/div- 10mV/div - 10V/div- not BNC- storage space 14M (for screenshots?)- signal generator, max. 50kHz, 13 waveforms- 3.5" screen- size 66x110x19.5mm, weigth 138g- around US$65 on aliexpresshttps://www.fnirsi.com/products/ds215hManual:https://cdn.shopify.com/s/files/1/0694/8310/2426/files/DS215H_Manual_ZH_EN-60p-V1.1-2025.01.07.pdf?v=1740811725

author: tunk
author_rank: Super Contributor
timestamp: March 06, 2025, 02:58:58 pm
content: A short intro in Chinese:https://youtu.be/watch?v=x2LmF3Otqbg
BSIDE 83010/84020 etc PSU Firmware - modifiable/updateable? - Page 1
Forum section: electronics / testgear

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: August 11, 2024, 01:12:14 pm
content: Bought one of the above to play about with an SMPS.Idiotic typo on the screen - 'programmalbe' instead of programmable.Any way to get in to firmware and modify?

author: ledtester
author_rank: Super Contributor
timestamp: August 11, 2024, 03:40:27 pm
content: All of the pictures I find of it on the web have "programmable" spelled correctly** so perhaps:- complain to the vendor and ask for a replacement/refund/compensation- get in touch with BSIDE - perhaps through the vendor - to see if there is a way to correct the issue- put a piece of black tape over the bottom edge of the display -- after all you know that it's a DC power supply** Just noticed this recent video (July 29th) from IMSAI Guy which still has the misspelling:https://youtu.be/lfUAsHeMiyo?t=1m55s

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: August 11, 2024, 05:09:30 pm
content: Yes seen that too.First World problem, but FFS!Will contact vendor.Meanwhile want to test output performance.

author: cybermaus
author_rank: Frequent Contributor
timestamp: March 03, 2025, 06:12:01 pm
content: Any luck with the firmware?

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: March 06, 2025, 07:35:21 am
content: No, just Banggood offering me $5 voucher or something like that!
DE-5000 Kelvin probe DIY - Page 1
Forum section: electronics / testgear

author: Silicium81
author_rank: Regular Contributor
timestamp: March 06, 2025, 08:35:27 pm
content: I designed a case to connect real Kelvin probes to the LCR meter DE-5000.I share here the case manufacturing files. Note: Note: new version with invisible screw when the case is in place (reverse screw)For the connection PCB, I used Igor78's design (see here:https://www.eevblog.com/forum/testgear/de-5000-lcr-tl-21-mod/msg5566097/#msg5566097)For high reliability of the connection, I had an ENIG type surface treatment done allowing an impeccable surface condition. This is a chemical deposit of gold.The case manufacturing files are on Thingiverse:https://www.thingiverse.com/thing:6970673I had about ten printed circuits made with the ENIG finish. If you like it, I can send you a copy for €2 + €3 for international shipping (paypal only).Link to the Kelvin Probe used (the cables will be connected directly to the connections on the printed circuit board):https://fr.aliexpress.com/item/4001017941564.html

author: ea1cyx
author_rank: Newbie
timestamp: March 07, 2025, 08:03:11 am
content: hi Silicium81I would be interested in 1 copy of the printed circuithow can i pay you the 5$ ?my addressF.Temesftemes@gmail.commany thanks in advancebest regards from Spain

author: Silicium81
author_rank: Regular Contributor
timestamp: March 07, 2025, 10:27:20 am
content: @ea1cyx: check your mailbox