hybridfree/eevblog-posts huggingface dataset:
PI Pico Oscilloscope - Page 1
Forum section: electronics / testgear

author: simba15
author_rank: Regular Contributor
timestamp: January 28, 2022, 04:57:39 pm
content: So I recently saw this very nice Android Oscilloscope for use with the Pi Pico.I plan to test if it can work in Bluestacks or other android emulator for PC and Linux.The app is simple yet user friendly. I was actually impressed.https://github.com/fhdm-dev/scoppyThe APP uses 2 channels for input and 1 channel as a function gen ( all from the Pi Pico hardware.)This is all very low cost ,Full app is $1.89!! ( Practically free) and the Pico is a whooping $4.00The only issue with this scope is the lack of front end, as the pins are limited to 0 to 3.3v.The developer has provided some designs and I hope to start a further discussion here about the best methods to get a reasonable voltage range and input voltage protection.https://oscilloscope.fhdm.xyz/wiki/front-end-design-4Special thanks to the Devloper fhdm-dev ( on GIt)

author: simba15
author_rank: Regular Contributor
timestamp: February 21, 2022, 07:45:14 pm
content: So I have built a few of the front end designs for this scope.So far all works quite well.I would like to use a standard x10 probe with the device.The input impedance would need to be 1m and the Capacitance would need to be 117pf.Any simple changes that could be made?

author: Kleinstein
author_rank: Super Contributor
timestamp: February 22, 2022, 02:40:39 pm
content: The input resistance is set by Rg1 + (Rf1 in parallel to the input impedance of the OP). So with a slightly different resistor ( ~ 330 K) one could get close to 1 M input resistance.The input capacitance needed for the standard probes is in about the 15 to 30 pF range (some probles are a bit more tolerante to one side).The usualy way is to also have small capacitors in parallel to the divider at the input, some maybe some 33 pF in parallel to Rg1 and some 15 pF in parallel to Rf1) . The ~15 pF would need to be trimmable to get a reasonable good response to a square wave (like the probe compensation).The LM324 is a rather poor choice, as it is relatively noisy and also high bias. A more suiteable OP would be a low noise CMOS rail to rail type like MCP6272.A sensible alternative may also be a programmable gain amplifier like MCP6S21.
Authorized service center for Panasonic test equipment? - Page 1
Forum section: electronics / testgear

author: Hifi Necromancer
author_rank: Contributor
timestamp: February 21, 2022, 11:12:10 pm
content: It's looking more and more like my Panasonic VP-8132A signal generator has a bad PGA on the audio source board which is not something I can fix. I think my best option is to send it in to an authorized service center, but I'm having trouble finding one that works on this type of equipment. I'm hoping someone here can point me in the right direction. Thanks for any help.

author: bdunham7
author_rank: Super Contributor
timestamp: February 21, 2022, 11:43:53 pm
content: That's a tough area--good FM signal generators are like gold and pretty obscure when you go to service them. I recently looked at a fairly large lot of used equipment and the main thing I wanted was a Kikusui signal generator that had FM Stereo and advanced functions (it didn't even include the RF generator part) but unfortunately it appeared not to work and I had to decline due to fear of unobtaniumitis. 'Authorized' service on any of these is long, long gone AFAIK.Anyway, try this link if you haven't seen it already. He doesn't have your specific manual listed, but does state that repairs are possible. And let me know what happens, I'm curious. I have an FM Stereo solution now (R&S CMU200) but it is pretty basic. I'm always looking.https://sites.google.com/site/ej25awd/home/fm-generator-manuals

author: Hifi Necromancer
author_rank: Contributor
timestamp: February 22, 2022, 12:57:33 am
content: I saw that site too while I was searching for information on my unit. It appears he just repairs the attenuators.I guess I should be glad that at least the important stuff works, and the frequency/output is accurate.
Agilent or Keysight - move NAND flash to a good scope ? - Page 1
Forum section: electronics / testgear

author: EE-digger
author_rank: Frequent Contributor
timestamp: February 21, 2022, 05:01:39 pm
content: If one had a scope headed for the landfill (I know, all hands go up), could I move the NAND flash to a good recipient and rescue the expensive application licenses? I know SN and cal data will go with it. Does the user cal satisfy all cal needs on a "good" recipient board.I also wonder if the FPGA or any other devices are serialized and would cause one more roadblock to the scheme.

author: oz2cpu
author_rank: Frequent Contributor
timestamp: February 21, 2022, 05:59:28 pm
content: save the whole unit, and put it on ebay as defective,then people who need a part will purchase it as it is,if you start to poke it apart, its value become zero

author: EE-digger
author_rank: Frequent Contributor
timestamp: February 22, 2022, 03:19:25 am
content: At the moment however, the value of the licenses + MSO + wavegen is approximately $5k (USD), ignoring MSO cabling. It would be worth recovering if you want legitimate licenses. However, the recipient unit would be what the donor unit was, unless you hack it, which sort of defeats the purpose of the "recovery".And, I don't know which package the NAND flash is in, but you better be good at removing with minimal heat. Packages are usually only specified for three times or so (one side solder, second side solder, repair).

author: TheSteve
author_rank: Unknown
timestamp: February 22, 2022, 03:43:00 am
content: Doesn't like a very fun idea, calibration would never be perfect. But I am sure it could be done if the scope was really worth that much.

author: EE-digger
author_rank: Frequent Contributor
timestamp: February 22, 2022, 04:37:21 am
content: The cal does concern me. Any analog offsets or gains are going to be off because there is no storage mechanism (IMHO) for them on a given board, other than in that board's original flash.Hate to say this but maybe the answer is having the license served like it is for many software packages. Benchvue, as an example, allows you to move the license to another machine. It's not one of the smoother systems for doing so today but it does work.You would be able to pull back the licenses from afar, without having a working scope.
HP 37204 HP-IB Extender - Serial Protocol? - Page 1
Forum section: electronics / testgear

author: TaylorD93
author_rank: Regular Contributor
timestamp: February 21, 2022, 07:52:15 pm
content: Recently I couldnt resist dropping a bid on an Ebay listing for a HP 37204 HP-IB Extender.On its own, i think its pretty useless as typically you need two, however i wondered, as it converts GPIB to Serial for two Coaxial Connections (or Fiber Optic) being TX and RX, could it be possible to interface this to another serial protocol, say RS232/485 etc, ignoring ofcourse the difference in voltage levels (I think i could easily resolve that).Is anyone familiar with the actual Serial protocol these HP-IB Extenders use?I dont have any USB to GPIB devices, but have a fair few instruments with GPIB, so wondered if it could be possible to "upcycle" these HPIB extenders to something more useful as a low cost USB to GPIB device.thanks

author: alm
author_rank: Super Contributor
timestamp: February 22, 2022, 12:03:17 am
content: I assume you've read theservice manual? It is surprisingly sparse for a HP product, I guess during this time they were already starting to put less effort in it. It does not contain a full protocol description, but it does mention it's using an alternate mark inversion encoding (page 8-17), and that the master sends a frame every 1.6 ms when no other device is connected (page 8-18). Possibly some sort of keep alive or handshaking signal. Seems like to use it in the way you intend, you'd have to reverse-engineer the serial protocol by sending it a bunch of GPIB signals using a controller, and observing the response with a scope or logic analyser.I'm not convinced that this is less effort than just using the transceivers and using the GPIB protocol documentation to build your own GPIB interface. All the 37204 is going to give you is media conversion, after all, if won't implement any of the control logic like addressing, handshaking, etc.
New Aneng looks even more like a smartphone than ever! - Page 1
Forum section: electronics / testgear

author: Fungus
author_rank: Super Contributor
timestamp: February 21, 2022, 11:36:38 am
content: It looks like a smartphone, it acts like a smartphone, it charges like a smartphone, it even pretends to have a fancy smartphone camera on the back (but it's just a 4 LED flashlight).https://www.aliexpress.com/item/1005003895399997.htmlYou can't have one yet though. It's only on pre-order.

author: Fungus
author_rank: Super Contributor
timestamp: February 21, 2022, 02:18:27 pm
content: Is it just me or is the USB charging port right where I'd put my index finger if I was holding it in my left hand?Let's hope it's properly isolated.

author: alm
author_rank: Super Contributor
timestamp: February 21, 2022, 02:22:55 pm
content: I wouldn't count on them including a proper isolated DC-DC convertor, but maybe they'll surprise us.My money would be on a note in the manual to unplug the cable and keep your fingers away from the USB socket while measuring.

author: kripton2035
author_rank: Super Contributor
timestamp: February 21, 2022, 03:38:49 pm
content: don't need it... it does not connect to any social media !

author: BrokenYugo
author_rank: Super Contributor
timestamp: February 21, 2022, 10:46:46 pm
content: I'll hazard a guess if that USB is isolated it isn't to CATIII levels.Funny thing is they could have added another stupid whizbang feature and killed two birds with one stone by making it wireless charge only.
SDM3055 Poor Autoranging and Wrong Measurements - Page 1
Forum section: electronics / testgear

author: Cam765
author_rank: Newbie
timestamp: February 24, 2022, 02:06:53 am
content: Hello,I've noticed before that my SDM3055 has had some difficulty adjusting it's autorange to the correct range but now it all together is off. It reads around 200 Ohms when nothing is connected and if I manually change the range the resistance changes to some value about halfway in the range. If I switch to 4 wire it drifts from anywhere between -100 and 100 Ohms (sometimes 0) depending on if I'm touching the front panel which is strange. I checked all the fuses and they're fine so if anyone has any helpful information that would be useful. I'll try to post some videos of it acting up if I can.Thanks

author: tautech
author_rank: Super Contributor
timestamp: February 24, 2022, 02:34:31 am
content: Some more history of this unit please.How old is it ?Have you the latest firmware version installed ?https://int.siglent.com/download/firmwares/?ProId=26

author: Cam765
author_rank: Newbie
timestamp: February 24, 2022, 03:03:31 am
content: Sorry forgot to mention that it has the latest FW: 1.01.01.25HW: 03-00-00-13-00Device is less than a year old (about 9 months)

author: tautech
author_rank: Super Contributor
timestamp: February 24, 2022, 03:21:36 am
content: Quote from: Cam765 on February 24, 2022, 03:03:31 amOK thanks.I know of no other units that behave like this so I suggest you contact your supplier with the view to claiming warranty for a faulty unit.

author: Kleinstein
author_rank: Super Contributor
timestamp: February 24, 2022, 08:28:42 am
content: This looks like faulty unit.The result in 4 wire mode is actually undefined if connection is made between the sense and drive part. Ideally the meter should give an error. In some cases it may auto range to the highest range and with some meters the high ranges are 2 wire only, even of 4 wire is selected.

author: tautech
author_rank: Super Contributor
timestamp: February 24, 2022, 08:36:37 am
content: Quote from: Kleinstein on February 24, 2022, 08:28:42 amIt is.Factory tech support requests it be returned to Siglent NA for repair.Siglent NA have also been copied in so will be expecting it.Cam765Please contact: info@siglentna.comSupply full info about the unit and a link to this thread is also a good idea.

author: Cam765
author_rank: Newbie
timestamp: February 24, 2022, 09:47:58 pm
content: Will do. Thank you all for the helpful info.
Cypress CY7C64013-PC,  Programmer hardware question - Page 1
Forum section: electronics / testgear

author: sampler1
author_rank: Regular Contributor
timestamp: February 21, 2022, 12:34:49 am
content: Hi all,Hope you are all doing well.I have a batch of hardware programmers , mostly inexpensive models. I also have a batch of Cypress CY7C64013-PC (28 pin Dip) that I need to program and none of my programmers will do the job. I went on a quest to purchase another universal programmer but all I find that can do the job requires that I take a second mortgage on my house.Does anyone know of an inexpensive way to program this IC or an inexpensive programmer that can do the job?Best regards, to all.

author: gslick
author_rank: Frequent Contributor
timestamp: February 21, 2022, 02:45:21 am
content: What is your budget for a device programmer, and how soon do you need one?The BP Microsystems BP-1200 and BP-1400 device programmers support programming the CY7C64013. If you are patient and not in a hurry, sometimes those can be found around the $100 range on eBay, including the DIP socket module. Don't see any in that range listed currently. Those are older models which need a PC with an LPT port. The newer USB interface BP-1410, BP-1610, BP-1710 models are a lot less common on eBay, and a lot more expensive. The BP-1410 and BP-1610 I have were somewhere closer to the $400-$500 range when I acquired them a while ago.If you have a final version of your firmware and won't be needing to iterate through testing and revision cycles one at a time, maybe you could also find someone who would be willing to batch program them for you?

author: sampler1
author_rank: Regular Contributor
timestamp: February 21, 2022, 05:07:31 am
content: Gslick,Thanks for the info, a Parallel programmer would be fine. I guess my budget is around $200USA as I am in Canada and the exchange and shipping is a killer. I think I just found a BP-1400but I can't locate a device list. also I have no idea what windows OS the software would work in. Cant locate the legacy software also.still searching..Stay well.
Any new hi-tec Mastech DMMs? - Page 1
Forum section: electronics / testgear

author: Bobson
author_rank: Regular Contributor
timestamp: February 21, 2022, 05:00:51 pm
content: Mastech acquired Appa previous year, adding it to MGL group (https://mgl-intl.com/about).Hope newer DMM models from Mastech, based on Appa design, could emerge somewhere.Maybe they are already available? The latest Mastech product catalog I have is 2019, there are nothing interesting (to me) yet.
Are these authentic Hakko solder iron temperature sensors?  (re: #191-212) - Page 1
Forum section: electronics / testgear

author: sofakng
author_rank: Regular Contributor
timestamp: February 21, 2022, 02:25:19 am
content: Amazon is sellingHakko 191212 Replacement Tip Temperature Sensorwhich are Shipped and Sold by Amazon.com (and not a 3rd party).I've purchased them and they came inside a plastic bag instead of the Hakko blister-pack:

author: Arts
author_rank: Regular Contributor
timestamp: February 21, 2022, 03:31:57 am
content: I have read that the river is selling fakes/knockoffs/clones of many different products. True? Who knows, but it wouldn't surprise me. Not an organization that I consider trustworthy...just my 2¢You can also buy the fake temp sensors packaged in the blister pack, so no guarantee there either. I only buy Hakko parts & supplies (including the 191-212) from an authorized Hakko distributor. You can find them on the Hakko website.
Panasonic (National, Levear) VP-8132A, no right-channel modulation - Page 1
Forum section: electronics / testgear

author: Hifi Necromancer
author_rank: Contributor
timestamp: February 18, 2022, 10:50:57 pm
content: Hello from the Pacific Northwest USA.I'm hoping I can get some assistance with my Panasonic VP-8132A AM/FM/Stereo signal generator. The issue is I get no right channel signal through either the composite output or the RF out. In every modulation mode the left signal is just mirrored to both sides when decoded. I've verified that when viewing the composite waveform directly there's no right channel information in any mode. There's no service manual available and this is a little outside my field of expertise, so any help is appreciated.The areas of interest are the "stereo" board and the "AF source" board below it, both accessed from the top of the unit. On inspection I didn't see any obvious faults. I probed the connectors linking the two boards looking for any sign of the R signal and found none. I found a left and an inverted left signal on stereo J1/source J6 and that's it (besides some logic and power supply). It seems like there's no R signal getting to the stereo board.I removed the stereo board and probed the connectors again on the source board in case something was grounding the R signal, but got the same as before. On the source board, the R signal is definitely being generated, as it's present at TP4 and I can toggle the frequency between 1k and 400hz from the front panel control. I can follow the signal to an AD7523JN but I don't see any output at Iout1 or Iout2, and I'm not sure if there should be.Does anyone here have a working model that I can compare readings with?

author: Hifi Necromancer
author_rank: Contributor
timestamp: February 20, 2022, 04:46:16 pm
content: I took a picture of the bottom of the board and overlayed it with the top so I could trace the signal a little more easily. The right channel signal takes only one path and lands on the D2 pin of an ADG433 CMOS switch, U20 on the source board. D2 and S2 form a normally open "contact" and are controlled by a bit input at In2, which if fed by one of the UPD65012 PGAs on the same board.The In2 bit never goes high, no matter what. It should at least be enabled when modulation mode is set to R, but I can "spam" the front buttons and get nothing. I checked and it's not shorted to ground, and it ties directly to the PGA, so I think that bit output is simply not working.I can't find any data on the 65012 unfortunately...
some interesting Axiomet modular probes - Page 1
Forum section: electronics / testgear

author: paulbt
author_rank: Regular Contributor
timestamp: February 18, 2022, 04:12:49 pm
content: Hi, forum colleagues!I just want to share with you a pleasant surprise that I had after ordering some cheap modular probes that I intended to use with a pair of diy long&flexible cables with 4mm bananas at both ends.I'm into hobby electronics since 2015, but I've never seen something similar anywhere: the tip is protected with spring-loaded transparent shrouds, the body is made of thick plastic which feels rather heavy and on the inside there is a fuse socket for 6x32mm. Please check the photos attached.Very useful for electrical work, or if you want some bulkier probes to fit in your hands, or to use it as on-wire fuse holder, or maybe if you regularly burn your mA fuse and your dmm needs total dismantling to change it -> then place a quicker and/or lower current fuse in the probe body.With 2A fuses installed, they add ~0.1 ohms to the total resistance of the 2x wires with 4mm bananas shorted together.Anyways, I will use them for some electrical work around my house. They fit nice into schuko wall sockets.This post is just info only, if you find it interesting or useful, hit the "say thanks" button on the top right corner.Keep on!

author: Hydron
author_rank: Super Contributor
timestamp: February 20, 2022, 10:21:30 am
content: Be careful with fused probes - never use them for safety checks; what if the fuse has blown and you measure 0V on a live circuit m

author: modoran
author_rank: Regular Contributor
timestamp: February 20, 2022, 04:40:28 pm
content: You should never buy anything from companies which does not manufacture or design anything, just rebrand from others. It is better to buy from honest chinese sellers than from them.
Tektronix TDS1000B series color LCD upgrade - Page 1
Forum section: electronics / testgear

author: Joebeazelman
author_rank: Regular Contributor
timestamp: January 26, 2022, 07:28:19 pm
content: I'm in the process of modifying my TDS1012B panel to use LEDs instead of the near dead CFL backlighting when I realized it may be possible to convert it to a color LCD. There's another model, the TDS1012C, with identical specs except for a color LCD instead of a Black and White one:https://www.mouser.com/ProductDetail/Tektronix/TDS1012C-EDU?qs=tEz3BkPb1rzlsUwmwna5fQ%3D%3DIt got me thinking it might be possible to swap out my LCD in mine for a color one. The TDS1012B LCD manufacturer part number is LTBHBTD84H10CK made by Nanya. I am not sure who makes the color one, but the Tektronix part number is 850-0115–70.https://www.eevblog.com/forum/testgear/tektronix-tds1000b-series-hacks/According to the thread, there's a firmware setting for operating in color or black and white. It flags an error if the hardware doesn't support it, which might pose an obstacle. It's unclear how it detects the differences. It could be a simple model number check, LCD test or onboard color circuitry check. There's a poster on the thread who claimed a successfully color conversion, but didn't provide details when asked.Has anyone tried or have know if it's even possible?

author: TekForever
author_rank: Contributor
timestamp: February 01, 2022, 05:17:12 pm
content: If I remember correctlyThe TDS1kB display uses a different cable to connect (the connector on the main board side is larger), and it also connects directly to the PSU for its backlight power (the HV inverter for the fluorescent bulb is on the PSU).The TDS1kC display connects straight to the main board (I believe the newer displays use LEDs so no need for HV inverter) for its backlight power and the main board connector is smaller.I don't know if it's a simple pin-to-pin for the display connection, but the power connection should be simple enough. As far as the FW goes, I couldn't tell you.

author: Joebeazelman
author_rank: Regular Contributor
timestamp: February 20, 2022, 04:36:22 pm
content: Thanks. Schucks! I have the old CCFL version. I will convert it to LED anyway. As it was once said, "Keep scope alive!"
Anyone notice the Bob Parker/Dick Smith/Blue ESR meter is now being cloned? - Page 1
Forum section: electronics / testgear

author: jayjr1105
author_rank: Regular Contributor
timestamp: February 19, 2022, 05:56:49 pm
content: I've messaged him and apparently it's a PIC16F627A replacing the now obsolete Zilog chip. As someone who owns and loves the Blue ESR kit, I'd love to see the internals of this.https://www.ebay.com/itm/133690692481

author: ataradov
author_rank: Super Contributor
timestamp: February 19, 2022, 06:12:09 pm
content: "10k uF"? If only we had some system of units that allowed us easily express values like this.

author: jayjr1105
author_rank: Regular Contributor
timestamp: February 19, 2022, 06:34:30 pm
content: Update, he actually sent me a pic of it.

author: ledtester
author_rank: Super Contributor
timestamp: February 19, 2022, 06:57:06 pm
content: More info can be found here:https://anatekinstruments.com/products/anatek-blue-esr-meter-full-kit-for-self-assembly-besr_kitSpecifically the assembly/user manual:https://cdn.shopify.com/s/files/1/0915/6622/files/Blue_ESR_assembly_manual.pdf?v=1608155660or:http://bobparker.net.au/esr_meter/Blue_ESR_assembly_manual_Jan_2015.pdf

author: PushUp
author_rank: Regular Contributor
timestamp: February 20, 2022, 09:09:31 am
content: As it is nearly impossible to get an "original" Bob Parker from USA, when living in the EU, I bought an ESR-Meter from a very nice and helpful guy from Portugal some years ago, having best prices and services, thus I can fully recommend him! You also get any info on his webpage!https://evbesrmeter.pt/index.htmNow, you can also get a new "Bob Parker" made by EVB with all the improvements:Quote:After many complications and delays, mostly caused by almost two years of the Covid-19 pandemic, here we managed to arrive and launch these two new test device concepts, developed from scratch by Bob Parker in Australia and marketed by EVB meters in Portugal. They are an evolution, very demarcated, from all previous versions where many improvements have been introduced, from the power supply, microprocessing and testing process, all this effort goes towards offering repair technicians an even more evolved and precise tool from previous versions and with a improved performance at all levels, all at a very attractive price.These were the ones I bought, which still work without an issue and are still available in different colours and models, probabaly a bit cheaper than the blue one:Cheers!

author: Shock
author_rank: Super Contributor
timestamp: February 20, 2022, 11:14:36 am
content: I own the original Bob Parker designed Electronics Australia MK I and Dick Smith/Silcon Chip MKII plus have the Altronics MKII and the Jay_Diddy_B designed ESR Meter Adapter. The old kits and the Bobs LOPT/FBT Tester took years to find at a reasonable price and condition.The EVB ones are really nice. Unless Bob Parker gets a cut avoid those Chinese gray ones.
Program for the Keithley 2450 as a fast arbitrary current waveform player - Page 1
Forum section: electronics / testgear

author: justanothername
author_rank: Regular Contributor
timestamp: February 19, 2022, 08:46:58 pm
content: Hi everybody.I wanted to share with you a project I worked on the last weekends. For those who own a Keithley 2450 SMU, with this you can use it to play arbitrary current waveform. I use it to compare LT-Spice battery models with the reality.The features are:A nice GUI with all necessary settings, logging and plotting of the resultsSources current and measures voltageThe waveform is loaded from a LT-Spice style PWL text file, so you can compare your measurements with your simulationTiming is accurately done by the SMU internallyGenerates the trigger model and trigger timer. Loads the data points as config list into the SMU.Undervoltage lockout (UVLO) optionally included into the trigger modelAbility to calculate NPLC (number of power line cycles) automatically based on the desired time stepFull program configuration can be saved and loaded with .ini filesExport results to .csvExtensive logging and failure detectionNice beep sounds (optional)The Source Code and the Binaries can be found here:https://github.com/dotmjsc/K2450_Arb_I
New Rigol scope line DS70000 Series - Page 1
Forum section: electronics / testgear

author: dmendesf
author_rank: Frequent Contributor
timestamp: February 19, 2022, 06:10:27 pm
content: https://www.rigolna.com/ds70000/?utm_source=AAC&utm_medium=eNews&utm_campaign=StationMaxWhat do you think?

author: Fungus
author_rank: Super Contributor
timestamp: February 19, 2022, 06:58:48 pm
content: I think there's already a thread on it.https://www.eevblog.com/forum/testgear/rigol-annaunces-serious-scope-ds70000/
HP 35670A options EEPROM - Page 1
Forum section: electronics / testgear

author: simone.mannori
author_rank: Newbie
timestamp: April 11, 2018, 02:58:40 pm
content: Hi,I have recently bought a second hand HP 35670A. The instrument works perfectly but some (software) options are not active. For a similar instrument (HP 35665A) I have found the files that enable ALL THE SOFTWARE options (please see the attached files).I'm looking for someone that has done the very same hack for the HP 35670A that use a similar 8 pins EEPROM to enable/disable software options. In particular I'm interested in activating options 1D0 and 1D2. Thank in advance for your help and congratulations to Dave for its video blogs :-).Simone Mannori - Frascati / Rome / Italy

author: simone.mannori
author_rank: Newbie
timestamp: April 11, 2018, 03:13:53 pm
content: For the HP 35665A the original EEPROM files can be found herehttps://ko4bb.com/getsimple/index.php?id=manuals&dir=01_ROM_Images_and_Drivers/HP_35665AAs alternative, you may buy a complete "ready to use" kit here:http://www.glkinst.com/test-equipment/Cheers

author: TimInCanada
author_rank: Regular Contributor
timestamp: December 11, 2021, 06:34:31 pm
content: In case anyone else is searching for 35670A options configuration, attached is a dump from the 85C72 configuration EEPROM of a unit with the following options:1C2 Add instrument BASIC1D0 Computed order tracking1D1 Real time octave measurements1D2 Swept sine measurement1D3 Curve fit/synthesis1D4 Arbitrary sourceAY6 Four Input Channel ConfigurationUFC 8MB RAMUFF 1 MB NVRAMHere's a hexeditor view of the file:Cheers,Tim

author: suj
author_rank: Regular Contributor
timestamp: February 15, 2022, 11:09:04 pm
content: After software upgrade it's time for a hardware upgrade. My DSA had AN2 option.To enable the UFC option, I used a 72-pin SIMM with 4 MB DRAM of this type.First I checked what type of memory is installed on the memory board. There were installed FPM-DRAM chips with 80 ns access time. I checked what type of socket is installed (standard 72-pin SIMM) and found a similar memory on a local auction site. It cost something around 1.5 EUR. It works.Profit

author: rdebets
author_rank: Newbie
timestamp: February 21, 2022, 09:46:17 pm
content: The EEPROM modification of the 35670A to enable the options doesn't seem to require a checksum adjustment, contrary to the EEPROM modification of 89410 where a checksum adjustment is required. Just put the row of v's in your own image and the options become active. Nice to have them all enabled and play around with them
Recommendation on budget IR thermometer used also for cooking? - Page 1
Forum section: electronics / testgear

author: nightfire
author_rank: Frequent Contributor
timestamp: February 19, 2022, 02:08:43 am
content: To broaden my tools collection I would like to buy a IR thermometer, that should do the following stuff/will be used for these tasks:- monitor temperature of Lithium batteries during charge/stress discharge on electronic load- troubleshooting of PCB when possible parts are overheating- cooking: As I do experiment with some things it is nice to really know how hot a pan or its content are actually- background: the magic temperature is around 140 deg. C, where the "Maillard reaction" really takes off, and where stuff actually gets a brown crust- when veggies get rid of lots of water, then basically you boil them in a pan which will not give great flavour...(And preferrably to stay clear of 180 deg C, where other nasty stuff comes out of hiding)And because I want to easily begin with this, I would like to buy some budget device, that is not utter crap, but may have some shortcomings. And if I really would need some better stuff, I will know exactly what and why I would need it when looking for some equipment from Fluke, FLIR oder Testo...This means I wold rather shell out money in the 50 €€€ region initially- and some adjustable emissivity would be nice, because I would like to measure the temp of some pans (stainless steel, got rid of all non-stick-Teflon stuff long ago) which will mean they will have some metal reflection.Are there any recommendations of some stuff that will fit into this category or maybe some more expensive stuff that maybe will be available on ebay for some decent price, like the Fluke 62 Max?
Suggestions on the software design of the signal source host computer - Page 1
Forum section: electronics / testgear

author: Junce
author_rank: Contributor
timestamp: February 19, 2022, 06:50:04 am
content: Hello everyone! Do you have any good suggestions for designing a host computer software?It is mainly a host computer software for the signal source.My own idea, I need to have an arbitrary waveform drawing function and can freely import waveform data files produced by other software.I also want to ask, do you have any better ideas?

author: nctnico
author_rank: Super Contributor
timestamp: February 19, 2022, 11:10:06 am
content: Quote from: Junce on February 19, 2022, 06:50:04 amThere are many software packages that can do this. Most manufacturers of arbitrary waveform generators supply software for free. Look at Tektronix for example.
Any experience with Vitrek DC Loads? - Page 1
Forum section: electronics / testgear

author: LaurentR
author_rank: Frequent Contributor
timestamp: February 17, 2022, 06:44:55 am
content: In my never-ending search for the perfect DL Load (currently using an Instek PEL-3031E), I bumped into these newer models from Vitrek:https://www.tequipment.net/vitrek/power-supplies/I am not familiar with Vitrek although they seem to be a legit US manufacturer of (mostly power-related) test equipment.The DC Loads themselves are fairly unusual with a single button and a color touchscreen. They are competitively priced with the likes of Instek or KS.

author: thm_w
author_rank: Super Contributor
timestamp: February 17, 2022, 11:23:38 pm
content: Good find.It looks like their main benefit is high pulsed loads:Quotehttps://vitrek.com/product/dl150/Tequipment screwed up their specifications though. They list the DL150 as "500W", implying 500W continuous, but its not, its 125W continuous.So they are not competitive in terms of continuous power rating.https://www.transcat.ca/media/pdf/vitrek-DL-series-datasheet.pdfQuote
Front panel banana jacks and remote sense terminal for electronic loads (BK8500) - Page 1
Forum section: electronics / testgear

author: toli
author_rank: Frequent Contributor
timestamp: February 17, 2022, 08:27:21 pm
content: Thought I'd share this so that anyone else who might have a need for it can assemble one for themselves.I wanted to add front panel banana-jacks as well as remote sense terminals for my BK Precision 8500 electronic load, so I've designed a small PCB to do this.It should fit on many other similar instrument that share the same front panel structure.For the banana jacks I use the CT3151V1-0/CT3151V1-2 for the black/red connectors. I'm attaching to this post a picture of a board I've assembled for my own use, as well as Gerbers for download.Another download link for the Gerbers as well as a bit more information can be found here:https://tolisdiy.com/2022/02/17/adding-banana-jack-and-front-remote-sense-terminals-to-electronic-load/
Looking for Datasheets: Newport Instruments 214-X Digital panel meters - Page 1
Forum section: electronics / testgear

author: Uky
author_rank: Regular Contributor
timestamp: February 16, 2022, 04:52:52 pm
content: Greetings forum.I am looking for datasheets (pinning!) for old Newport Instruments Digital Panel Meters "214-x".These are 3-4 1/2 Digit (LED) panel meters powered by 5V and internally usingIntersil ICL 7107, 40 pin Wide DIP panel meter chip.No hits on internet searches. The model 215-x was found but that product usesanother ICL chip (That is labelled Maxim-ICL)KO4BB Manuals has a sub-section "Newport" but only one entry (other).In worst case - I will have to re-create the schematics from the PCB which luckilyis one-sided but it does not hurt to ask the community first...Cheers

author: SeanB
author_rank: Super Contributor
timestamp: February 16, 2022, 06:15:43 pm
content: Likely an almost exact copy of the datasheet application note, with a set of pins for selecting decimal point position, and will either have an on board -5V generator, or will need both 5V rails supplied.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: February 17, 2022, 01:31:45 pm
content: What a coincidence!I just found a Newport Model 253 in a pile of stuff and turned it onIt works. It is a 199 millivolt meter that is pretty accurate.Some pins are used to turn the decimal points off when they are grounded to the digital ground.Pins 5, 14, A, are the decimal point pins.The other pins are labeled on a sticker on the module.I do not know if this is an exact pinout to the 214, but maybe...It requires 5 volt plus or minus .25 V power on pin "L" Digital Ground is pin "M" Analog Ground is pin "N"Input to be measures is pin "P"Have not opened it up, since it works. I can do that if it would help.If you want any further info on the connector pins, let me know.
"Maester PAT 5000" Hipot tester is AC? - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: February 14, 2022, 09:54:28 am
content: Hi,Does the above HiPot tester give AC or DC do you know?https://picclick.co.uk/Maester-5000-Pat-Tester-Portable-Appliance-Electrical-Test-223364845764.html

author: PushUp
author_rank: Regular Contributor
timestamp: February 15, 2022, 11:14:34 am
content: I don't know this PAT Tester, but as you always need to build up a constant pressure, in order to find a leak, it must be VDC as VAC cannot do the trick.Here is an example with 1000 Volt from my PAT Tester on the one hand and the Fluke measuring VDC and VAC in AutoHOLD at the same time on the other hand, to show it:Cheers!

author: Faringdon
author_rank: Super Contributor
timestamp: February 17, 2022, 05:19:43 am
content: Thanks, but eg most offline SMPS hipot tests are spec'd at say 3750 VAC?I thought the DC ones are just for one the product has loads of Y capacitance?....or when you dont want y capacitance to obscure any faults?
Ideal 61-340 not power on with T<20 C, how to disassemble? - Page 1
Forum section: electronics / testgear

author: ulyanoff
author_rank: Contributor
timestamp: November 17, 2017, 04:05:48 pm
content: Hello all! Strange device, works only in a warm room with a temperature above 20 ° C (68 ° F), all measurements being accurate. As soon as the temperature is low, for example, it simply does not turn on. Tried the body for bending, tapping in various places - to no avail, also replaced the battery with a new one - it did not help. Please help, can anyone know how to disassemble it? having unscrewed screws the case does not open, because it holds the central switch. Maybe a secret?

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: November 18, 2017, 12:29:20 am
content: On the backside, there are 2 screws along the bottom, and a third under the tilting stand. You have to pull the stand all the way out to access this screw.

author: beanflying
author_rank: Super Contributor
timestamp: November 18, 2017, 12:48:20 am
content: What sort of batteries are you using in the meter?Some NiMh batteries have very poor low temperature characteristics, there are specific low temp ones available. If you are using them see if you can still source NiCads which are much better even in sub zero temperatures.Even primary cells don't like low temps either or it may of course be the meter

author: ulyanoff
author_rank: Contributor
timestamp: November 18, 2017, 08:44:16 pm
content: We continue. All the same I dismantled it. for those who will do it, I want to inform you that the switch itself is not needed to be removed. I do not have this it turned out, and I thought that he was holding all the fees. In fact, simply the board is tightly "seated" in the case, and is removed separately from the switch.Then he carefully inspected the damage, washed the remnants of Chinese flux. Selectively checked capacitors on ESR / 10?f x25 v showed ESR 15 ohms.The problem has been determined. Then replaced by 10 ?f x16v, there were 4 of them. (at 25 v in was not at hand). After soldering, he washed everything off the flux. After assembling the multimeterworks in a cold room !! . While on testing. Here's a photo, it might be useful for others.p.s. I hope this helps!

author: WaldoP
author_rank: Newbie
timestamp: February 16, 2022, 07:50:18 pm
content: I know this is an old topic, but I'd like to thank you for your work here. I hadn't associated the seemingly random failure of my 61-340 with temperature, which is almost constantly in an environment of between 18 and 21 degrees. Once I saw your post, and head-slapped myself, I realized that it was temperature-sensitive, and the solution was obvious. I had one cap w/ ESR=16, and like you, I replaced all four. Meter is fully functional after an hour in a refrigerator, so it would appear that it is all good now.I cannot thank you enough.-Random cold-meter guy.
HP54600 Series BNC Connectors (54654A, 54645D, ETC) - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: February 18, 2022, 02:05:41 am
content: I am looking for a pair of BNC connectors for an HP 545600 series scope. I bought a HP54545A that has the BNC connectors sheard off. Otherwise the scope works perfectly. Perhaps someone has a dead PCB?SamW3OHMUSA - East Coast
DSO 2512G =  Broken Screen - Page 1
Forum section: electronics / testgear

author: Veton
author_rank: Newbie
timestamp: February 15, 2022, 08:29:20 pm
content: Hello to All,Does anyone know where to find replacement screen for DSO 2512G?According to manual, it is 2.8 inch, TFT. When I opened, I found 24 pin connector, (first 4 or last pins, dont know which) are cut short and not connected at all.I would appreciate if someone would be kind enough to tell me where to find replacement.Thank you all!
"Maximum Floating Voltage" - have I understood correctly? - Page 1
Forum section: electronics / testgear

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: February 15, 2022, 12:21:58 pm
content: I have three PSUs made by a very respectable manufacturer.2 are 0-30V DC, one is 0-160V DC.They have floating outputs with the usual jumper that can connect either or neither of + or - to ground, which is mains earth referenced.The 0-30V unit specs state "Maximum Floating Voltage" to be +/- 150V DC. The 160V one +/- 700V DC.Am I therefore correct that I could safely use both 0-30V in series with the 160V one, to produce up to 220V, provided that I (a) only had the earth reference on the first (or second for that matter) 0-30V unit or (b) have it all fully floating thus ensuring that nothing on the '+' end of my circuit under test is earth referenced?Therefore NOT, for example, with the 160V one 'first' and earth referenced and then one or more of the 30V ones, as the latter would exceed their max floating voltage?Hope I've explained that clearly enough...

author: PartialDischarge
author_rank: Super Contributor
timestamp: February 15, 2022, 12:52:56 pm
content: Yes, you are more or less correct. The 0-30V units go first and then the other one, so that the firsts see the lowest common mode voltage possible.Also you control which side of the output (+ or -) gets closer to ground via any necessary impedance.

author: BeBuLamar
author_rank: Super Contributor
timestamp: February 15, 2022, 01:19:33 pm
content: 30 and 160 you only have 190V not 220V. I would connect the 30V to ground so that its voltage is never 160V above ground.

author: Brumby
author_rank: Unknown
timestamp: February 15, 2022, 01:25:57 pm
content: Quote from: BeBuLamar on February 15, 2022, 01:19:33 pmAh.... You need to pay more attention:Quote from: 6SN7WGTB on February 15, 2022, 12:21:58 pm

author: Brumby
author_rank: Unknown
timestamp: February 15, 2022, 01:31:08 pm
content: Quote from: 6SN7WGTB on February 15, 2022, 12:21:58 pmYep. You've got it.

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: February 15, 2022, 02:01:01 pm
content: Thanks all.

author: Brumby
author_rank: Unknown
timestamp: February 15, 2022, 02:57:11 pm
content: Although, I would avoid having it ALL floating. I'd keep one end of one of the 30V supplies grounded.Reason: When you have a floating supply, then connection to ANY earth-referenced circuit immediately sets the supply voltage with respect to earth potential. If such a circuit were to have 1kV on it (through a fault condition, say) then you would have a bad situation - potentially without any indication.Keeping the thought of "What can go wrong" and "How bad would things be if that happens" in mind whenever working with electricity (and other things) that have the potential of causing you to have a really bad day.

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: February 15, 2022, 07:11:43 pm
content: Quote from: Brumby on February 15, 2022, 02:57:11 pmAgreed, that would be my default. Mainly for valve supplies with B+ at the HT end and C+/C- bias, so as you say one 'end' of one of the 30V supplies grounded.
OpenMetra: Gossen METRAHit communication via BD232 interface - Page 1
Forum section: electronics / testgear

author: horo
author_rank: Regular Contributor
timestamp: February 14, 2022, 06:55:41 pm
content: Hi,Get measurement data from multimeter Gossen METRAHit 29S via BD232 serial interface.I have just uploaded my projectOpenMetrato GitHub. It automates my METRAHit 29S via the BD232 interface (with USB/serial converter). The programs allows to select function and measurement rate, switch the instrument on and off and create a nice time plot as well as a spectrum. The low-level communication functions are encapsulated in a python module.Martin

author: horo
author_rank: Regular Contributor
timestamp: February 15, 2022, 10:28:54 am
content: A simple example: switch your meter to transmit mode by pressing DATA and ON at the same time and use this minimalistic Python script to print a value every second:Code:#!/usr/bin/pythonfrom openmetra import OpenMetrawith OpenMetra() as om:while True:print( om.get_measurement() )Tested with METRAHit 29S on Debian stable, but the program should also work on Windows when you adapt the name of your serial port (e.g. 'COM8'); other METRAHit meters should work too (at least the 2x series) when you supply their ID (e.g. 28S: 0x0C, 29S: 0x0E):Code:with OpenMetra( serial_device = 'COM8', known_devices = [ 0x0C, 0x0E, ] ) as om:...
How to fix this scope? - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: February 14, 2022, 03:33:48 pm
content: Hi,The below is a video of what two of our scopes are doing...https://drive.google.com/file/d/1G63XIvb5T2IrLjQpszB3dLRxDxKeN9o4/view?usp=sharingits 480kb so i though to upload a drive link.They especially do it when turned on first thing monday after they have been in the damp factory over the weekend......after a few hours of being left on....you turn them off, then on again, and they are "cured".What is the problem? How can we fix it?

author: scopeman
author_rank: Frequent Contributor
timestamp: February 14, 2022, 03:42:15 pm
content: Well first off I would have a look at the power supply and scope the supply outputs on first power up. It could also be a fault in the reset circuit.Also look at ZIF connectors. IIRC you can scope the calibrator output on these scopes and use that as a troubleshooting aid as I believe these are Tektronix scopes are they not?What happens if you leave them on 24/7?SamW3OHM

author: Faringdon
author_rank: Super Contributor
timestamp: February 14, 2022, 07:48:59 pm
content: QuoteThanks, all power to the building is turned off at nights/weekends unfortunately......i will try leaving them on all day though........i left one on all day today, and at 2pm, it started working properly

author: Martin72
author_rank: Super Contributor
timestamp: February 14, 2022, 09:45:55 pm
content: Hi,Which model is this ?

author: sicco
author_rank: Regular Contributor
timestamp: February 14, 2022, 10:14:26 pm
content: Looks like it is a Tektronix TDS3000.Problem i think is in the Display Memories. These are the two square-ish Micron SRAM chips. MT128something. In the corner, next to the largest chip on the main board. Bad solder joint or a short from corrosion/moisture on their pins.Either one of these SRAMs or that large one (MM9595 / ADG360 / ADG460c) next to it (one or two of its soldered pins, not the chip so leave it on the board!)Not to rule out: the display itself and/or the connector for it. To rule that out, if you have a plugin module for VGA (TDS3VM?) and an old VGA monitor then see if that has the same problem.

author: sicco
author_rank: Regular Contributor
timestamp: February 14, 2022, 10:27:28 pm
content: PS: assuming it is TDS3000, when it boots it will run some memory tests including a display memory test. I’d expect that one to fail when the problem shows. The output is available as a TTL level 38400,n,8,1 stream on one of the 100 pin connector pins. Details on that elsewhere in EEVBlog forum.