hybridfree/eevblog-posts huggingface dataset:
HP 66319D questions - Page 1
Forum section: electronics / testgear

author: fchk
author_rank: Frequent Contributor
timestamp: August 07, 2020, 04:22:32 pm
content: I've just picked up an HP 66319D, whcih seems to be in rather good condition. It powers up, and the display is still very bright and clear.However, the connector plugs for the outputs and the DVM are missing. What is the original manufacturer, pitch (5mm oder 5.08mm?), and part number?On the Top of the unit there is a sticker "Open Sense Lead Detection is Disabled" and two additional lines that got unreadable.Is this anything to worry? DO the sense lines still work, but there is no warning? How can I re-enable this?Thanks.Frank

author: av500
author_rank: Contributor
timestamp: August 07, 2020, 04:38:24 pm
content: Quote from: fchk on August 07, 2020, 04:22:32 pmsee page 36 in the manual (https://www.manualslib.com/download/872511/Agilent-Technologies-66111a.html)

author: pigrew
author_rank: Frequent Contributor
timestamp: August 07, 2020, 05:53:04 pm
content: The connectors are 5.08mm pitch. Based on what I posted a few years ago:Quote from: fchk on August 07, 2020, 04:22:32 pmQuoteYou may want to update the firmware to enable use of the 14565B software.The meters usually come with a huge white sticker on the top describing high capacitance/normal capacitance modes, and a few other things.I've not touched it in years, but I put together some MS Windows software to control it, similar to the 14565B software:https://github.com/pigrew/HP663xxCtrl

author: fchk
author_rank: Frequent Contributor
timestamp: August 10, 2020, 07:04:23 pm
content: Thanks. I've ordered the required connectors.The ROM seems to be 03.01. This should be the lastest one, right?I haven't found a service manual, even not on the keysight site. Does one exist?fchk

author: pigrew
author_rank: Frequent Contributor
timestamp: August 11, 2020, 01:32:44 am
content: Quote from: fchk on August 10, 2020, 07:04:23 pmThat's the latest firmware, AFAIK.I've not been able to find a service manual for it. The 66309B has a public service manual (5964-8176), but without schematics. The 66332A and 66312A have public service manuals with schematics, but are not as similar.
Siglent 1052DL+ - Page 1
Forum section: electronics / testgear

author: AdrianFu
author_rank: Contributor
timestamp: August 03, 2020, 03:22:01 am
content: Recently I did a firmware update on my 1052 which then upgraded the model to a 1202(?). Not in front of the DSO right now. Not happy with it has it causes the DSO to run slow eg changing voltage level from say 1v/DIV to 10v/DIV can take up to a minute for anything to happen. Is it possible to back pedal back to the original firmware?Adrian

author: tautech
author_rank: Super Contributor
timestamp: August 03, 2020, 03:29:25 am
content: Quote from: AdrianFu on August 03, 2020, 03:22:01 am1202(?) ??Never been such a model.Where did you source the firmware from ?QuoteSDS1000DL+ firmware page:https://int.siglent.com/download/firmwares/?ProId=42

author: AdrianFu
author_rank: Contributor
timestamp: August 03, 2020, 07:03:02 am
content: I downloaded the firmware from that site. This is what happened after updating the firmware.Adrian

author: AdrianFu
author_rank: Contributor
timestamp: August 03, 2020, 07:04:29 am
content: A better pictureAdrian

author: tautech
author_rank: Super Contributor
timestamp: August 03, 2020, 07:08:03 am
content: Quote from: AdrianFu on August 03, 2020, 07:04:29 amWOW, a 200 MHz DL+ !I'll drop tech support a line for you.

author: AdrianFu
author_rank: Contributor
timestamp: August 03, 2020, 08:03:16 am
content: Thanks. AppreciatedAdrian

author: tv84
author_rank: Super Contributor
timestamp: August 03, 2020, 08:17:19 am
content: Quote from: AdrianFu on August 03, 2020, 03:22:01 amIf you want to downgrade the BW, send me a pm.

author: AdrianFu
author_rank: Contributor
timestamp: August 04, 2020, 07:28:39 am
content: All good thanks TV84. Now (hopefully) back to normal.Should have asked the question about the firmware upgrade before I did itAdrian
Wanted: Pictures of a Toellner 8840/50 that has the analog/RS232 interface - Page 1
Forum section: electronics / testgear

author: jogri
author_rank: Frequent Contributor
timestamp: August 03, 2020, 08:07:23 pm
content: Hi guys,i am searching for pictures (schematics would be even better, but i doubt that they're available) of a Toellner TOE 8840/50 PSU that has either the analog, RS 232 or GPIB option. I have a unit (custom 8852, 40V@4A) without any options and i would like to control it either via a PC directly or via a DAC output of my 34970A.I've taken a peak inside the PSU, all PCBs are fully populated but i couldn't determine where the leads for the analog/digital (232/GPIB) outputs should be attached (hence the need for pictures of a unit that has those options). This bears the question if Toellner uses separate PCBs and extension boards for units that have those options or if i'm just too dumb to find the attachment points.I've attached a few pictures of my unit, you can see that it has three "extension cards" (two in the front and one between a transformer and the fan, since the ones in the front have 12bit ADCs i assume that those are the control boards for the two channels, but don't ask me what the little board in the back does)
hp8591 adding Option 119 (Noise-Figure) - Page 1
Forum section: electronics / testgear

author: 9H1LO
author_rank: Newbie
timestamp: August 03, 2020, 01:44:19 pm
content: I sometimes need to measure gain and NF on RF pre-amps but don't have or have access to a proper NF meterApparently my hp8591 can take option 119 which is a card for NF measurements plus you obviously need a NF generating head and some other bits and bobs, which I have found here and there at affordable prices compared to a used complete NF meterMy question is, should i buy the 119 card do I just slot it in the SA and the firmware in the SA will "find" it and add the option, as in is it that simple or would there need to be a f/w upgrade/eeprom change ect ?
Is this a valid way to change cal. battery on HP 3468A? - Page 1
Forum section: electronics / testgear

author: Dan Moos
author_rank: Frequent Contributor
timestamp: August 02, 2020, 10:28:15 pm
content: Just got an old HP 3468A in great shape for 25 bucks. I want to change the cal. battery. It reads 3V, but I know that they go off a cliff when they go.I lack an isolated soldering iron. As many know, I have to do the swap while the meter is powered so that I don't lose calibration data when I pull the old battery.I have two ideas. One is to put a ground lift plug on the meter. If it has a linear supply with a transformer, it should be floating with the ground lifted, right? (and thus no path to ground from 3V through my iron).Other idea is to wire my power supply (Rigol DP832) in parallel with the battery clip, with the meter unplugged. As long as I don't ground reference the Rigol (ignore the green lug), I am safe to use my non isolated iron right?I can't think of a problem with either method, but want to be safe This is currently my nicest meter, and I don't want to erase the calibration data!Also, any recommendations on a good battery to replace it with?

author: Miti
author_rank: Super Contributor
timestamp: August 03, 2020, 12:46:21 pm
content: I used an UPS on battery to power the soldering iron, and the soldering iron only, while replacing the battery on my two HP3478As.For HP3478A there's this program made by Lmester:https://www.eevblog.com/forum/testgear/free-hp3478a-multimeter-control-program/msg3081034/#msg3081034that can save, restore and manipulate the calibration constants. I don't know much about the HP-IL interface but from what I see, there are ways to interface GPIB to HP-IL, but I don't know if the command sets are the same between the two.
Philips PM3055 oscilloscope graticule colour - Page 1
Forum section: electronics / testgear

author: pcolbeck
author_rank: Contributor
timestamp: July 31, 2020, 07:52:02 am
content: I was watching this video of a Philips PM3055 and it looks like the graticule is orange:https://youtu.be/sf_nWoB58osIs that a modified scope or where they orange on some of them? The other videos and pictures I have seen of this range of scopes shoes them as blue/green like most scopes.I think the orange against the blue trace is a pleasing combination and leads to the question why are scopes always blue/green The graticule could be any colour and the trace could use any colour as well or be switchable. I used to work with CRT monitors that were "black and white" but you could switch them between white on black, green on black and orange on black dependant on your preference.

author: tautech
author_rank: Super Contributor
timestamp: July 31, 2020, 08:28:46 am
content: Many are red however how the appear mostly depends on the graticule intensity adjustment.If you're really interested in oscilloscope music check out the master:https://www.youtube.com/user/jerobeamfenderson1/videos

author: pcolbeck
author_rank: Contributor
timestamp: August 01, 2020, 09:20:02 pm
content: Thanks. I have just picked up a non working 100Mhz PM3065 with two probes for £50. The seller said it he's had it for years and it was working well untill recently then it broke with buzzing from the PSU.Sounds like the capacitors so that's a winter project for me. I love the look of this range of Philips scopes.
Schematic needed for Tektronix PS 2510 , also user manual if possible  Thanks - Page 1
Forum section: electronics / testgear

author: tecophil
author_rank: Newbie
timestamp: August 02, 2020, 10:17:49 am
content: I appreciate this product was made under different Names ... Information is available for the triple output variant, but to date nothing of the basic 0-35volt/ 0-3500mA model. thanks for any help.

author: siggi
author_rank: Regular Contributor
timestamp: August 04, 2020, 07:41:21 pm
content: The PS 25XX supplies are quite modular in construction as I recall from repairing mine. I'd take a look at theschematics on TekWiki, see whether they don't fit your PS quite well. I'd wager the display board and the HPIB boards are identical, the dual-channel PS board might simply have one channel populated or some such?
Testing Integrated circuits using only a Multimeter!! - Page 1
Forum section: electronics / testgear

author: kgavionics
author_rank: Regular Contributor
timestamp: August 02, 2020, 08:28:18 pm
content: Hi guysI'm troubleshooting a TV Power supply board, tested all the discrete components which were ok. Now, I think that the main SMPS main circuit is the culprit, because it's resistance between the VCC to ground is aournd 200 kohms! I'm not sure though! I used to have an oscilloscope and it would have been very easy to probe the output of the circuit and see the waveform! But now I only have a MM (Brymen BM-869S) and I'm wondering how to be sure that an IC is not working in a particular board?Thank you in advance!

author: CDaniel
author_rank: Frequent Contributor
timestamp: August 02, 2020, 08:54:41 pm
content: That resistance is very high , not an indication that the IC is bad . It could be bad but not for this reason .For repair the scope has very little use , because the SMPS controllers have protections triggered by multiple faults and in many cases won't output anything for you to see the waveforms .Usually if all parts in the secondary and primary seems good , no shorts , no dried electrolytic caps , than the logical step is to replace the controller and see if this solve the problem or you have to check more the components .
Unsecuring an HP 3458A - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: August 02, 2020, 01:41:30 pm
content: I have a 3458A on my bench that won't allow me to do an ACAL. The DMM apparently has it's security enabled.I've tried "acal_secure OFF" and "SECURE 3458A,0" and both give me an error, so it looks like someone has changed the default code.Is there any way to clear the code?Thanks!

author: sokoloff
author_rank: Super Contributor
timestamp: August 02, 2020, 01:45:56 pm
content: There’s a jumper inside to disable security. First, try 3458 as the code, though.All well covered in the manual:http://literature.cdn.keysight.com/litweb/pdf/03458-90017.pdf

author: Jwalling
author_rank: Unknown
timestamp: August 02, 2020, 02:14:12 pm
content: Quote from: sokoloff on August 02, 2020, 01:45:56 pmThat worked. Many thanks!Theprogrammingusers manual states that the default code is 3458A, not 3458.From the examples:OUTPUT 722;"ACAL ALL,3458A" !RUNS ALL AUTOCALS USING!FACTORY SECURITY CODEOUTPUT 722;"SECURE 3458A,0" !DISABLES SECURITY FOR CALIBRATION AND AUTOCALEDIT: The above was from document 03458-90014, the users guide.The 03458-90017 calibration manual you linked to is 3458!I wonder why they changed it? Or maybe a document error?

author: Jwalling
author_rank: Unknown
timestamp: August 02, 2020, 02:25:06 pm
content: I just downloaded the latest users guide from keysight:https://www.keysight.com/main/redirector.jspx?action=ref&cname=EDITORIAL&ckey=3088413&lc=eng&cc=US&nfr=-31940.1242732.00On page 340:QuoteSo it's still wrong there...

author: doktor pyta
author_rank: Frequent Contributor
timestamp: August 02, 2020, 02:40:06 pm
content: Please excuse me, Jwalling.Off topic.Are You this guy:https://www.youtube.com/channel/UC8vB_s677Des5TnGXnNsRJw?

author: Jwalling
author_rank: Unknown
timestamp: August 02, 2020, 02:50:03 pm
content: Quote from: doktor pyta on August 02, 2020, 02:40:06 pmNope. My name is Jay.
JUNTEK PSG9080 Dual channel signal generator - Page 1
Forum section: electronics / testgear

author: JOHN LEE
author_rank: Newbie
timestamp: August 01, 2020, 08:55:27 am
content: Recently I am setting up my own personal laboratory. During the browsing of AliExpress, I saw a signal generator with high cost performance. Has any friend bought it? I want to guide whether it can really reach 80MHzhttps://www.aliexpress.com/item/4001271854079.html?spm=a2g0o.productlist.0.0.7c554dc3dvNXyc&algo_pvid=a6058b69-8e87-482e-98a3-8d283c24ff51&algo_expid=a6058b69-8e87-482e-98a3-8d283c24ff51-39&btsid=0b86d80215962714919896819e2ffe&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

author: rvalente
author_rank: Frequent Contributor
timestamp: August 01, 2020, 02:08:43 pm
content: Never heard about, seems that someone wants to beat the FY6900 gens...I've seen a massive 50% off in aliexpress, would not that be to good to be true?

author: MadTux
author_rank: Frequent Contributor
timestamp: August 01, 2020, 06:36:23 pm
content: Well, someone forgot the "k" in the name
Moving coil analog panel meter, changing the needle. - Page 1
Forum section: electronics / testgear

author: Oxmstr
author_rank: Contributor
timestamp: July 30, 2020, 12:38:55 pm
content: I want to make a analog clock that some people already made, but I want to make it bigger (larger needle) and with back-light (as in car tacho / speed meter). I'm looking at 91C16 or C4 moving coil analog meters because they are cheap and I want to mod them so a mistake won't be expensive.Has anybody modified a analog panel meter? I tried looking on the interwebs, but there aren't many resources about these meters, seems like people that use them already know everything about them. Locally I can only get 10 V full range and I would need to make them 3 V, but that shouldn't be that hard.Also how to know when to use a shunt for ammeters? I didn't see any markings on the front plate that stated what kind of shunt to use. There are 50 mA full scale meters do these require shunts?

author: bob91343
author_rank: Super Contributor
timestamp: July 30, 2020, 08:32:05 pm
content: Get yourself a book on electrical measurements. Most of your questions will be answered there.Working on these is a job for a watchmaker. Adding to the problems is the strong magnet in most meters.A shunt needs to be used when measuring currents higher than the basic movement. The trap is to make it precise enough and to use special alloy that has low temperature coefficient.
USB PC oscilloscope projects. - Page 1
Forum section: electronics / testgear

author: nigelwright7557
author_rank: Frequent Contributor
timestamp: July 24, 2019, 03:11:44 am
content: My first USB PC scope was PIC18F4550 460K samples / second.Worked very well.My next version was a PIC32MX and ran at 1Mega samples / second.Next version was a PIC32mz and ran at 2 mega samples per second.This was a little more difficult as I had to get involved with fine scale SMD.With a bit of practice I managed to solder them ok.My current version is PIC32mz with AD9200 a2d and runs at 12.5 mega samples / second.The pic software is mostly USB interface and the rest grabbing data from the a2d.The PC end is the clever end with data screens and an fast fourier transform display.

author: Mechatrommer
author_rank: Super Contributor
timestamp: July 24, 2019, 04:25:08 am
content: Thanks for telling us how delicious your chocolate is.

author: horo
author_rank: Regular Contributor
timestamp: July 24, 2019, 08:48:47 am
content: To ease your job of building the next version, please think about an EzUSB from Cypress (CY7C68013A). The processor pcb comes as "saleae clone" for some bucks from the friendly Chinese and iswell documented, so you can concentrate on the analog frontend. If you look at e.g.Hantek6022it's an easy task with much room for improvement. And you get the SWfor freeas a starting point for your own experiments.

author: robert.rozee
author_rank: Frequent Contributor
timestamp: July 28, 2020, 03:18:31 pm
content: Quote from: nigelwright7557 on July 24, 2019, 03:11:44 amhi Nigel,i'm quite interested in this. for the past few days i've been mulling over ways to use a pic32MX170 as a low-end DSO, and this evening started looking into the Cypress device used in the saleae clones. my plans with the MX170 were to use the internal RAM to hold around 50kpts of samples, and send them back to the host over a serial-to-usb bridge.how adaptable would your pic32 software be for use on a pic32MX270 - with the ADX MUX controlled from the host PC? this would have potential for a single-chip (in DIP package) solution, connected via USB, with switchable input scaling via the MUX using little more than a few resistors in a chain.cheers,rob :-)

author: nigelwright7557
author_rank: Frequent Contributor
timestamp: July 30, 2020, 07:23:58 pm
content: since i started this thread i have gone onto pic32mx which runs at 200mhzi used an analogue devices external a2d and can get up to about 25 mega samples/second.great fun including trying to smd solder fine pitch ic's.
Manual for Heath 25MHz Oscilloscope, model SO-4226 - Page 1
Forum section: electronics / testgear

author: Lathe26
author_rank: Contributor
timestamp: August 09, 2020, 04:09:07 am
content: Just posted the manual for a Heath 25MHz Oscilloscope, model SO-4226. It was also marketed as theGould 25MHz Oscilloscope (RTO) 325Meguro Oscilloscope MO-1252A 25MHzEnjoy!https://archive.org/details/heath-25-mhz-oscilloscope-so-4226-manual
OWON Tablet Oscilloscope - Page 1
Forum section: electronics / testgear

author: pmaggi
author_rank: Contributor
timestamp: July 30, 2020, 03:04:34 pm
content: Hi, surfing the web I found this tablet oscilloscope from OWON... TAO3000 seriesAccording to it's characteristics, seems to be a good entry level oscilloscope.+ 2/4 channels+ Max 100MHz Bandwidth，1GS/s sample rate+ Max 14-bit high resolution ADC+ Max 40M record length; max 45000 wfms/s waveform refresh rate+ low back ground noise+ 8 inch 800 x 600 high resolution LCD, multi-touch screen, more user-friendly operation experience+ SCPI, and LabVIEW supported+ multi- trigger, and bus decoding function+ multi-interface integration - USB host, USB device,LAN, Wifi(optional)https://www.owon.com.hk/products_tao3000_series_4ch_8%7C14bit_tablet_oscilloscopeIn aliexpress the price is about USD 429 for the 4 channel versionhttps://es.aliexpress.com/item/4001162695389.html?spm=a2g0o.productlist.0.0.71b031efnOJX3d&ad_pvid=202007300803045055794387838380003503752_1&s=pSomeone has tried it? I couldn't find any review or video about itIf specifications are true, it could be a goot competitor to Micsig
Step Attenuator driver circuit for Rohde & Schwarz FSEM / FSEB / FSEA problems  - Page 1
Forum section: electronics / testgear

author: hafrse
author_rank: Regular Contributor
timestamp: July 29, 2020, 07:09:11 pm
content: Hello,I have an issue when stepping the input attenuator in my FSEM , it seems that the operating system crashes/hangs and I need to restart the analyzer. some king of surge or noise when switching to different step is generated and hangs the entire system.Any experience which board and parts/area in that board the attenuator dirver circuit are located?Thanks!
FeelTech FY6900 (250 MSa/s 14-bits) versus JunTek JDS6600 (200 MSa/s 12-bits) - Page 1
Forum section: electronics / testgear

author: pascal_sweden
author_rank: Super Contributor
timestamp: July 26, 2020, 01:07:42 pm
content: The FeelTech FY6900 seems to be the better choice of both options!Or are there specific reasons why one would lean towards the JunTek JDS6600 instead (besides a lower price)?FeelTech FY6900:https://www.aliexpress.com/item/4000012709976.htmlJunTek JDS6600:https://www.aliexpress.com/item/32867548193.html

author: pascal_sweden
author_rank: Super Contributor
timestamp: July 29, 2020, 02:35:42 pm
content: Anybody who has both devices?

author: Adrian_Arg.
author_rank: Frequent Contributor
timestamp: July 29, 2020, 03:08:28 pm
content: I had a FY6900 60Mhz, which sold it and bought a FY6900 20Mhz, it is not worth spending on a 60Mhz, it is for hobby these like the jds6600, if it is for serious work I would personally go for rigol, siglent. The fy6900 Mhz works for me because I use it for hobby in electronics and arduino.in spanishyo tuve un FY6900 60Mhz, el cual lo vendi y compre un FY6900 20Mhz, no vale la pena gastar en un 60Mhz, es para hobby estos como el jds6600, si es para trabajo serio yo personalmente iria por rigol, siglent. A mi me sirve el fy6900 Mhz porque lo uso para hobby en electronica y arduino.
Keysight DSOX1204G scope LCD display "fuzzy", diffuse scattering - Page 1
Forum section: electronics / testgear

author: afran
author_rank: Newbie
timestamp: July 29, 2020, 12:38:05 am
content: I recently purchased a Keysight DSOX1204G scope. I really like it so far. The only thing that I find quite strange and that is bothering me is the LCD display.There seems to be some kind of strong diffuse scattering in the top-most LCD layer. It almost looks like there is another protective sheet on top of the LCD (of course, I removed the factory protection sheet with the red tab, and there really is no extra sheet on top of the LCD; rather, the scattering seems to happen within the LCD itself).The problem is most apparent during the boot-up logo screen: all regions that should be a single color (like the red or blue-gray background) "glitter" in different colors, depending on the angle that I look at the display. The same effect is visible whenever there is something bright on the screen.Next to a cheap Rigol scope (which the Keysight easily beats in all other aspects) the display looks really soft and fuzzy, not sharp at all.Is this normal? Keysight support says this is how all the DSOX1204G displays look like. What would be the reason to apply such a diffuse/scattering layer to the LCD display?
Extech 382280 Calibration - Page 1
Forum section: electronics / testgear

author: Elrod
author_rank: Contributor
timestamp: September 16, 2017, 02:44:18 am
content: Does anyone know how to calibrate the Extech 382280? I have one that I bought not working. I have it repaired, however, the output is off. Such as, set it for 30.0V and get 30.1V. It works but not quite in spec. There are no pots to adjust so it must be software. It has an RS-232 interface that it will accept commands through. The manual omits any calibration commands but that has to be how it is done. Anyone have a clue?Thanks,Elrod

author: mpozna
author_rank: Contributor
timestamp: July 28, 2020, 06:30:43 pm
content: Hi,Any chance you have the FW for the PIC18C452. I have one (given to me after someone manage to fry the PIC) and cant find FW anywhere... I would appreciate any help as this can become my only bench supply.Or, if you have the time, a description of the control pins and what signals they receive - I could work an MCU/display based on that...Thank you,Marius
Paid for the SPD3303X-E, got the SPD3303X! - Page 1
Forum section: electronics / testgear

author: liamkinne
author_rank: Newbie
timestamp: August 03, 2020, 07:47:26 am
content: Bought my first proper programmable power supply recently and decided that 10mV resolution would be good enough. Was giving it a bit of a test drive after it arrived and noticed that on the display it let me use a resolution down to the millivolt. Double checked the part numbers, low and behold I just scored $250 more power supply than I bargained for!.

author: DaJMasta
author_rank: Super Contributor
timestamp: August 03, 2020, 07:50:20 am
content: Now you don't have to telnet into it to hack it up to the X versionI like mine, even if the buttons under the knob are a bit backwards.

author: tautech
author_rank: Super Contributor
timestamp: August 03, 2020, 08:28:12 am
content: Well done !You deserve this:

author: tv84
author_rank: Super Contributor
timestamp: August 03, 2020, 08:30:25 am
content: Quote from: DaJMasta on August 03, 2020, 07:50:20 amAnd he has a more appropriate sticker!
PCIe Protocol Analyzer - Page 1
Forum section: electronics / testgear

author: gnif
author_rank: Unknown
timestamp: July 28, 2020, 03:38:40 pm
content: Hi All,TLDR: I am looking for some advice on a PCIe Protocol Analyzer that won't cost a fortune (no budget for this, it's for FOSS) and will allow me to capture the PCIe transfers. The link speed (Generation) doesn't matter, but it will need to physically be compatible with a x16 PCIe device even if only running at x4.Over the past few years now I have been working to fix bugs with the AMD Vega and Navi generation of GPUs when used for Linux VFIO passthrough (giving the GPU to a Virtual Machine for bare metal access and use). The issue we have with this is resetting the GPU into a power-on state so the Virtual Machine can properly initialize and post the GPU inside the VM, and then if the VM crashes or is a hard reset, we need to recover the GPU into a good known state for re-use.With a ton of reverse engineering and a little help from AMD's engineers, I have a method that gets the GPUs working, but it's not reliable and as such without getting my hands on confidential details of the GPU I am stuck. About the only thing I can think of is to capture the GPU traffic in progress at the time of the reset to see what exactly the GPU was doing to get an idea of the state the GPU is in when we can't recover it.This entire project is open source and goes hand in hand with my open source projectLooking Glass.
Intriguing CRT issue with a Tektronix 2225 oscilloscope - Page 1
Forum section: electronics / testgear

author: oldwhitelodge
author_rank: Newbie
timestamp: July 27, 2020, 12:50:43 pm
content: I have days on looking at the the horizontal output amplifier of this scope due to an issue. The x scan works absolutely fine at slow scan rates, but as the picture shows. RHS X output becomes highly distorted at higher scan rate as if there was low-pass filter operating, hence me susprecting that it was a capacitor problem. I disconnected the inputs and found that the drive from the attenuator board was perfect.I could not find a problem even after changing capacitors. I never thought to disconnect the CRT itself at the output until the end. I used a tube from a working 2225 and got a perfect X scan! The amount of time I've wasted on this!Anyway, I have no idea why the CRT would cause this type of distortion - has it gassed. I cannot work it out as I would have though the X-plates would have a very high resistance! I inspected the tube quite closely but could not see anything wrong.The picture attached shows the distortion on the x-plates of the 2225.Any ideas?Chris
Siglent 1104XE hardware update 6.1.35R2 issues - Page 1
Forum section: electronics / testgear

author: sharktank1
author_rank: Newbie
timestamp: June 06, 2020, 01:05:14 am
content: I just did this update and it did fix a few things (Auto setup used to brick the scope). But now I've lost my impedance settings per channel and the frequency filtering per channel. Where did they go?

author: mroek
author_rank: Contributor
timestamp: June 11, 2020, 10:40:10 pm
content: Surely you didn't do a hardware update...I've also noticed that the impedance setting is gone in this firmware, but I guess it's because you couldn't really change the impedance anyway. It's fixed at 1 M for this scope, so having a menu item for it makes no sense. What do you mean by frequency filtering? The channel bandwidth limit (to 20 MHz) is where it used to be.

author: Coyote
author_rank: Contributor
timestamp: July 26, 2020, 03:59:42 pm
content: Don't you think that impedance could be also 50 ohm if you use a terminator?

author: MathWizard
author_rank: Super Contributor
timestamp: July 27, 2020, 03:43:24 am
content: OP do you mean you can no longer set 1x, 2x, 5x 1Meg, etc probe imp?And you can't choose 20MHz or full BW ?

author: TK
author_rank: Super Contributor
timestamp: July 27, 2020, 04:10:28 am
content: SDS1104X-E never had 50ohm input impedance option, only 1M

author: tautech
author_rank: Super Contributor
timestamp: July 27, 2020, 04:13:30 am
content: Quote from: MathWizard on July 27, 2020, 03:43:24 amNo, very early SDS1*04X-E SW had a 50 ohm input selection yet the X-E models have never had the HW installed to accommodate such.AFAIK this was a SW carryover from the earlier SDS1*02X models that share the same UI.As it was confusing and 50 ohm inputs are not supported the option was removed from the X-E channel menu.

author: rf-loop
author_rank: Super Contributor
timestamp: July 27, 2020, 08:26:47 am
content: But, in BodePlot menu and in FFT meny there need be impedance selection and afaik there is and if user do not change default value is 50ohm. And this impedance setting mean EXTERNAL impedance (load) in scope input terminal. Impedance setting must be there and it is there. Other case it is impossible to select power scale for vertical (usually dBm). So, all places where need be 50ohm selection there is. (there is more, user can select also of course some other values just arbitrary or mostly used standard values like 75, 120, 300, 600 ohm etc)In SDS1x04X-E models have never been internal 50ohm (but as @tautech told in scope input menu it have been in very old FW but without any effect as residue from other model).And when user set these values in FFT or BP settings user is responsible about impedance matching in scope end of test setup, so if your transmission line is 50ohm need add external feed tthru terminator to scope input and select 50ohm in scope settings. In SDS1104X-E there is not this setting in normal xt scope setup menu. But there is also not power scale. This setting is with operating modes where user can also select power scale instead of voltage (or current). In this scope BP and FFT.
EDC Electronic Development Corp VS111N - Page 1
Forum section: electronics / testgear

author: Lifeborne
author_rank: Contributor
timestamp: July 24, 2020, 04:07:31 pm
content: Hello All, I am searching for an EDC VS111N schematic or similar. It is .001V to 111.11 VDC, with a Null indicator. Any info will be helpful, thanks.

author: Lifeborne
author_rank: Contributor
timestamp: July 27, 2020, 01:25:03 am
content: EDC has various makes and models, but has anyone seen or may perhaps own this model?
update the firmware on fluke 289 - Page 1
Forum section: electronics / testgear

author: oktay50000
author_rank: Newbie
timestamp: July 20, 2020, 02:50:12 am
content: hi guys, i got a fluke 289 and firmware on it is 1.12, is there any way to update it without that fluke cable???(dont wanna buy the cable for $70 and use it once)i have all chip programer adaptors,is there any way to update the chip itself directly

author: coromonadalix
author_rank: Super Contributor
timestamp: July 20, 2020, 08:02:07 am
content: The safest method is the usb cable ...You have some pcb clones on ebay for under 30$ ...https://www.ebay.com/itm/USB-optoisolated-IR-adapter-for-Fluke-/182450421884Or build on yourself ? you have some tutos on the web ..https://www.eevblog.com/forum/testgear/fluke-187-making-an-ir-cable/

author: oktay50000
author_rank: Newbie
timestamp: July 20, 2020, 05:47:11 pm
content: Awesome,thanks mate

author: Trader
author_rank: Frequent Contributor
timestamp: July 25, 2020, 07:45:02 pm
content: I wonder what will be the difference between an older Fluke 289 with the firmware 1.16 and a new Fluke 289 with the firmware 1.41 (and maybe new future versions).Is there any difference in the accuracy, precision, or anything related to the quality of measuring?

author: coromonadalix
author_rank: Super Contributor
timestamp: July 26, 2020, 01:58:52 pm
content: You should ask fluke directly, cant find any docs about this fw change vs boards revisions ??
Max average power of WILTRON 3620-D-15825 0.5-40GHz Directional Coupler - Page 1
Forum section: electronics / testgear

author: Tuxgvf33
author_rank: Newbie
timestamp: July 26, 2020, 01:03:59 pm
content: Hi all,I'm looking for any info (max average power in cw) of the coupler wiltron of the 360b version 40ghz and eventually the 65GHz version too.Many thanks for your help
MOVED: Cap blows cooling fan transistor in power-supply unit.  - Page 1
Forum section: electronics / testgear

author: paul8f
author_rank: Regular Contributor
timestamp: July 25, 2020, 09:43:09 am
content: This topic has been moved to: Projects, Designs, and Technical StuffProjects, Designs, and Technical Stuff.(as it's a general question, not specific to a particular model).https://www.eevblog.com/forum/index.php?topic=248272.0
SRS PS300 Series HV Power Supply Schematic?? - Page 1
Forum section: electronics / testgear

author: rodorr
author_rank: Newbie
timestamp: July 28, 2020, 01:16:09 am
content: Hello everybody,I'm looking for a schematic for a Stanford Research Systems SRS PS300 Series High Voltage Power Supply. I found a link to what supposedly is the correct file in another message on this forum but I was unable to decipher the URL,"http://www.electronicsandbooks.com/eab2/manual/Hardware/S/Stanford%20Research%20www.thinksrs.com/Product/PS300%20PS310%20PS325%20PS350%20Power%20Supply/Schematics%20A3%20c20120517%20.pdf"It's from 2017 so it might not be there even if I could decipher the URL.Does anyone here happen to have the schematic. If you do I would sure appreciate a copy.Thanks to everyone.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 28, 2020, 01:55:04 am
content: Only thing ive got is this (attached file) no schematics, parts numbers and values%20 is a space

author: edpalmer42
author_rank: Super Contributor
timestamp: July 28, 2020, 02:41:03 am
content: Quote from: rodorr on July 28, 2020, 01:16:09 amWhy are you having trouble deciphering the URL? I see that the site has been reorganized, but it's not that hard to navigate, particularly with the clues provided by the URL i.e.electronicsandbooks.comeab2manualHardwareSStanford Researchwww.thinksrs.comProductPS300 PS310 PS350 Power SupplyThe actual path turns out to be:electronicsandbooks.com(click on Downloads which is eab3/manual rather than eab2/manual)HardwareSStanford Researchwww.thinksrs.comProductPS300 PS310 PS350 Power SupplyThere are multiple files in the directory.

author: rodorr
author_rank: Newbie
timestamp: July 28, 2020, 10:47:45 am
content: Thanks, that's what I needed. Sometimes the internet tubes get a bit plugged and all they need is a good plumber. I was able to get to the "electronicsandbooks.com" site but went in the wrong direction when I got there and ended up down the wrong rabbit hole.

author: edpalmer42
author_rank: Super Contributor
timestamp: July 28, 2020, 04:15:48 pm
content: I'm actually surprised that the phrase 'rabbit hole' hasn't been replaced by 'web links' in regular conversation!
Blatant Keysight design knock-off - Page 1
Forum section: electronics / testgear

author: WattsThat
author_rank: Frequent Contributor
timestamp: July 15, 2020, 12:50:05 am
content: Stumbled upon this no name Chinesium dc programmable load on Amazon today. I cannot find dimensions anywhere but wow, talk about a total image rip-off, right down to the rubber bumper design sculpting.https://www.amazon.com/Hanchen-Programmable-Electronic-Channel-Protection/dp/B07T2BDXC4/ref=redir_mobile_desktop

author: WattsThat
author_rank: Frequent Contributor
timestamp: July 15, 2020, 01:19:19 am
content: There is a saying in English: “Imitation is highest form of flattery”I agree that copying a well known design might get you noticed but it does not drive sales. I would buy a Rigol or Siglent before I would buy a no-name brand, regardless of the look. Especially something like that load that is overpriced, IMO.

author: elantric
author_rank: Contributor
timestamp: July 23, 2020, 10:37:14 am
content: ^ its rebadged CKT8003http://www.cz-ckt.com/pd.jsp?id=180https://www.amazon.com/CKT8003-150V-300W-Programmable-Electronic/dp/B07YR3HMND/ref=sr_1_118?dchild=1&keywords=Programmable+DC+Electronic+Load&qid=1595500448&s=hi&sr=1-118https://www.aliexpress.com/item/4000219387764.html?spm=a2g0o.productlist.0.0.5dee3fb5UTtWlI&algo_pvid=f11500b1-05d2-4e19-b0a0-c4f27a58cb0c&algo_expid=f11500b1-05d2-4e19-b0a0-c4f27a58cb0c-0&btsid=0be3769015955006091728620e8125&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

author: HighVoltage
author_rank: Super Contributor
timestamp: July 23, 2020, 10:54:55 am
content: Does Keysight have a DC load that looks like this?

author: Villain
author_rank: Regular Contributor
timestamp: July 23, 2020, 01:42:17 pm
content: Quote from: HighVoltage on July 23, 2020, 10:54:55 amNo.
Save samples directly to usb on Rigol dm3058e  - Page 1
Forum section: electronics / testgear

author: andrew_salinas_
author_rank: Unknown
timestamp: July 25, 2020, 05:27:45 am
content: The internal storage is limited to 2000 samples and I couldn't seem to find a way to save unlimited samples to a USB drive as it takes the measurements. The only way seems to save it after it has finished recording and that isn't very useful at all. Anyone figure out how to do this or any viable work around?https://www.eevblog.com/forum/testgear/datalogging-questions-about-rigol-dm3058e-bench-meter/This is exactly what I want to do but there is no reply.
advice for purchasing oscilloscope - Page 1
Forum section: electronics / testgear

author: Ricc
author_rank: Newbie
timestamp: July 20, 2020, 06:31:24 pm
content: hello everyone, I want to buy an inexpensive digital oscilloscope and I wanted to ask for advice.I see:Siglent SDS1202X-EOWON XDS 3202EGw instek GDS1102-BRigol DS1202z-ereading the various posts I'm thinking of the siglent, but I wanted advice from those who are experts and have tried them.I will use it to test and repair car audio and home audio components.

author: espenfjo
author_rank: Newbie
timestamp: July 20, 2020, 06:40:34 pm
content: All of these will work for what you described.

author: Fungus
author_rank: Super Contributor
timestamp: July 20, 2020, 07:04:34 pm
content: All of those will show audio signals, no problem.Do you own a decent multimeter and soldering iron? If not, factor that into your budget even if it means not buying the Siglent.(and for car audio you might want something more portable...)

author: Ricc
author_rank: Newbie
timestamp: July 20, 2020, 07:24:12 pm
content: I have keythley 2015, weller wr3000 Soldering station, i had owon sds7102v but now i sold it.I need a good scope at budget price

author: Ricc
author_rank: Newbie
timestamp: July 22, 2020, 11:19:36 pm
content: I will buy a siglent,Sds1102x or sds1202x-e?

author: tautech
author_rank: Super Contributor
timestamp: July 23, 2020, 12:28:36 am
content: Quote from: Ricc on July 22, 2020, 11:19:36 pmSDS1202X-E is better featured and has much faster processor than older SDS1102X.The SDS1102X do offer a 8" display and 50 Ohm inputs if they are important however the 7" display SDS1202X-E is a better all round DSO.Carefully check the datasheets here:https://www.siglenteu.com/digital-oscilloscopes/

author: pidcon
author_rank: Contributor
timestamp: July 23, 2020, 10:42:25 am
content: Hi Ricc. I can only speak about my own GW-Instek GDS-1054B, which is just a lower end model of the oscilloscope you considering. I'm very happy with it, since it does the job very well and having four channels is useful. I needed its large memory record depth 10 Mpts. The scope apparently can be installed with apps from GW-Instek. Size is rather larger than other lower end scopes.You should also consider the Keysight InfiniiVision 1000 series, particularly the DSOX1102A or the newer DSOX1202A.

author: tv84
author_rank: Super Contributor
timestamp: July 23, 2020, 10:56:14 am
content: Quote from: Ricc on July 20, 2020, 06:31:24 pmThisthread would have helped you a lot. But it fell apart... Maybe you still can read something interesting besides the typical scope advices.

author: uargo
author_rank: Regular Contributor
timestamp: July 23, 2020, 01:30:59 pm
content: of these oscilloscopes that you put I would choose the siglent.If you can spend a little more, around € 500 you have the 4 channel Siglent SDS1104x-e:https://www.batronix.com/shop/oscilloscopes/Siglent-SDS1104X-E.htmlOr around 600 € you have the Micsig 4-channel portable and with battery:https://www.batronix.com/shop/oscilloscopes/Micsig-TO1104.htmlhttps://www.batronix.com/shop/oscilloscopes/Micsig-STO1104C.html
R&S SMIQ03B - Clearing the calibration flash EPROM - But How ? - Page 1
Forum section: electronics / testgear

author: teknut
author_rank: Newbie
timestamp: July 17, 2020, 02:43:20 pm
content: I think I may have a problem with the calibration memory slots in the R&S flash EPROM of my SMIQ being full. I get an "unable to save" message when I try store a new calibration value for the OCXO as explained in the manual. Reading the SMIQ R&S Manuals I also see:"The flash EPROM does not permit the deletion of individual data. Thus new memory space is occupied for each calibration. If there is no memory space available any more, the EPROM must be cleared by an authorized service shop and be written into anew. Thus a calibration should only be made if necessary"Well ... my one is necessary but don't have the money to have it cleared by an authorized service shop hence I need to use one that is not authorized but hopefully free!Can anyone in the know please help explain what is necessary to complete the flash EPROM initialization? Do I need software running on a PC or is done using the keypad and numeric codes?Thanks,A

author: SMB784
author_rank: Frequent Contributor
timestamp: July 18, 2020, 04:48:06 am
content: From my own thread on the R&S groups.io feed, it looks like reprogramming that EPROM is really difficult without the special (and apparently unobtainium) softwarehttps://groups.io/g/Rohde-and-Schwarz/topic/smt_03_error_311_memory/75186948?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,75186948

author: james_s
author_rank: Super Contributor
timestamp: July 18, 2020, 04:54:02 am
content: Can't you just use something like a TL866? What kind of EEPROM does it use? Maybe dumping a copy of the data first and then erasing it?

author: teknut
author_rank: Newbie
timestamp: July 22, 2020, 03:48:37 pm
content: OK ... hum!!! This sounds harder than I thought it should be. I will take the front out and disassemble it so I can find out what chip is used then report back. This coming weekend and I will take pics to upload.

author: james_s
author_rank: Super Contributor
timestamp: July 22, 2020, 05:49:47 pm
content: It's obviously harder than it should be. I can think of no reason they would make it so that the ROM can't simply be cleared out if it becomes full, or even automatically overwrite the oldest data.
E4407B spec an help - Page 1
Forum section: electronics / testgear

author: gab_au
author_rank: Contributor
timestamp: January 27, 2020, 12:55:54 am
content: Hi,I have an E4407B here that has a fault that I am unable to find any info on.When turned on the screen is white. Most times it will not boot correctly with some instances taking a couple minutes before the boot LEDs light and it attempts to load firmware from floppy. When it gets there DS7 and DS13 are alight, a combo not discussed in the manual.When it boots, it will then either read the loader disk and prompt for disk 1 or sometimes will stop 3/4 way through the loader. If it does get all the way through it fails a few tracks into disk 1. The floppy doesn't step and the screen remains white with the disk access light on.Has anyone seen this sort of behaviour before, and any hints - short of a replace the cpu board? Would faulty flash do that?If it does come to cpu board replacement, can I use an E4401-60059 rather than the E4401-60206 if I swap the personality eeprom?ThanksGreg

author: scopeman
author_rank: Frequent Contributor
timestamp: February 19, 2020, 11:13:18 pm
content: I would make sure that all of the power supply voltages are in spec and with low ripple. Also look for flaky tantalum capacitors.I would also bet that the electrolytics in the power supply are probably suspect.SamW3OHM

author: smgvbest
author_rank: Unknown
timestamp: July 09, 2020, 04:07:59 am
content: Did you get anywhere with your repair?I have the same symptom, DS1/DS7/DS13 is firmware checksum error

author: RecursiveLogic
author_rank: Newbie
timestamp: July 22, 2020, 05:30:18 pm
content: I've been wrestling with another issue (keypad not responsive), but have had a similar issue... screen is white, and DS7/DS13 lit. I did not have exactly the same floppy drive symptom, but I did have an issue where the firmware did not work correctly on the floppy. I reformatted the floppy, reinstalled disk 1, and was able to see the firmware continue screen, and DS7/DS13, cleared. There is also a green light on the board near the back. That light should should blink on and off every second or so. In my case, it was solid until disk 1 successfully booted to firmware continue screen.
Replacement screen lens for Brymen BM235 - Page 1
Forum section: electronics / testgear

author: Corner
author_rank: Regular Contributor
timestamp: July 22, 2020, 06:48:55 am
content: Hi guys,Do you know where I can get a new screen lens for my Brymen BM235? Dave doesn't seem to have it on his store and I can't find it anywhere.Has anyone gotten a replacement lens?If Dave happens to see this, can you point me in the right direction?Thanks.

author: Hydron
author_rank: Super Contributor
timestamp: July 22, 2020, 08:27:14 am
content: If your existing screen lens is merely scratched rather than broken, then you might be able to polish it using plastic polish (apparently Brasso can also be used, though I've never tried that).

author: Corner
author_rank: Regular Contributor
timestamp: July 22, 2020, 08:36:19 am
content: Quote from: Hydron on July 22, 2020, 08:27:14 amIt is just scratches. The plastic is not broken. I'll give it a try, thanks.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 22, 2020, 10:15:09 am
content: Ask Dave jones the eevblog owner for a spare part, or sent him a pm ??You see him on many threads here ..

author: Corner
author_rank: Regular Contributor
timestamp: July 22, 2020, 12:25:14 pm
content: Quote from: coromonadalix on July 22, 2020, 10:15:09 amYeah I'll do that. I looked at plastics polishing products and PlastiX costs $27 and it looks like it costs at least two plastic screen lenses.
HP- 66000A Keyboard surrogate/clone - Page 1
Forum section: electronics / testgear

author: rubidium
author_rank: Regular Contributor
timestamp: July 24, 2020, 06:56:02 pm
content: I have an opportunity to acquire a 66000A modular power system mainframe including a complete fill of assorted power supply modules in great shape and at a low price. However, the dedicated keyboard for it is absent. Of course I can just control each module via GPIB, but it would be nice to punch up output voltages and perhaps CC limits more directly. Has anyone attempted to create a surrogate for the keyboard that can do this, or have a schematic for the actual HP keyboard?At the end of the day I can probably simulate such a thing in MATLAB, but would first like to assess if there's a more direct hardware solution that I can have on the bench.Thanks,Jim