hybridfree/eevblog-posts huggingface dataset:
siglent sds2202x-e (firmware) - Page 1
Forum section: electronics / testgear

author: grumss
author_rank: Contributor
timestamp: February 04, 2021, 12:08:32 pm
content: Hi again,Ive just received a new siglent sds2202x-e, so far looks to be a good scope!Just giving all you guys a heads up, my firmware is 1.1.20 (or there abouts- without firing it up at 11pm)This firmware looks to be later than the upgrades on the website...cheers VK3XDK

author: tautech
author_rank: Super Contributor
timestamp: February 04, 2021, 07:31:58 pm
content: Quote from: grumss on February 04, 2021, 12:08:32 pmYep certainly later than any publicly available version which is V1.1.19R5 released March 2020Here's the thread for these scopes FYI:https://www.eevblog.com/forum/testgear/siglent-sds2000x-e/
VK3BHR LC meter inductance measurement problem - Page 1
Forum section: electronics / testgear

author: ashok.das81
author_rank: Contributor
timestamp: February 03, 2021, 03:46:03 pm
content: Hi all,I am making the LC meter V2 designed by VK3BHR Phil RIce.https://sites.google.com/site/vk3bhr/home/index2-htmlI have seen many have done this and it works fine, but in my case it is not measuring inductance properly. For example a 90uH coil shows 52uH, 3.3uH shows 0.3uH. The measurement is completely wrong. Capacitance measurement is looking OK. Calibration was done using a 1% 100pF NP0 capacitor. I checked F1 and F2.F1=00042879 (little lower than recommended value of 00050000 +- 5%)F2=00032223 (within 71% of F1)I have used all new components and L is a 100uH +/-20% toroid. C and Ccal are 1000pF NP0 +/-5%. I am using the PCB designed by VK3BHR. The relay is driven by a BC548B transistor as I cannot find a low current relay and I have checked the RELAY its clicking and contact resistance is less than 1 ohm. I am thinking that the +/-20% tolerance for the 100uH toroid is too high. What else could be wrong ? I will provide any other info that is useful for troubleshooting.Can anyone help me to find out the problem.ThanksAshok

author: ledtester
author_rank: Super Contributor
timestamp: February 03, 2021, 04:24:59 pm
content: You might try building the oscillator section from the AADE LC meter design:https://pe2bz.philpem.me.uk/Comm01/-%20TestEquip/-%20Tester-NonActiveDevice/Cl-251-IndCap-MeterKit/lc-meter-project.htm(search down to "The Oscillator")It uses a LM311 comparator. Then you could verify the frequency of the various LC tanks involved.

author: ashok.das81
author_rank: Contributor
timestamp: February 06, 2021, 02:46:47 am
content: Thanks for the reply. Yes I am trying to do this. Then I will measure the frequency wing a separate counter to see how the LC tank oscillating
Genrad Digibridge Test Fixture Hack - Page 1
Forum section: electronics / testgear

author: home_listening
author_rank: Contributor
timestamp: February 04, 2021, 01:35:38 am
content: Picked up one of these recently, more specifically a sanctioned Taiwanese build by Topward. Dates to '83 based off ICs. Works fine but the built in test fixture is an issue for anything but larger capacitors, The legs need to enter at least 10mm or so before they make good contact with the kelvin jaws. On top of this (could be old springs in my unit) but the jaws weren't usually opening such that they didn't touch toward the other end of the component lead.I had it open to satisfy curiosity and noticed that A: there was plenty of room at the front for a sortie of BNC connectors and B: the built in test fixture is screwed into the PCB, so I could potentially tap into these points without and soldering on the main board.I decided to add a BNC 4 wire kelvin IO, spaced on a 1" pitch as thats what the older HP et al units appeared to have.Will say right off the bat that I'm sure this has metrology implications with this unit, but I'm mostly going to just be sorting capacitors to 1% and am not that worried about actual value, usually done with tape over the panel so you can't see all the superfluous digits, so for my needs any potential degridation in quality is certain to be made up in practicality.Holes were drilled, BNCs were fitted and some bus wire was used to bridge the shields of the connectors, Getting everything screwed in was a bit of a dance but it all went together fairly quickly. Since the jaws are designed to short the force and sense terminals, a plastic separator has to be used to avoid this when using the external 4 wire hookup. This is actually quite neat, as without the separator installed the front panel BNC terminals work perfectly in 2 wire mode.I'm awaiting a package with some kelvin clamps to actually test this, so it I haven't been able to actually run it through it paces just yet, but I did measure a few bits and pieces and everything is in order. Residual capacitance is 1pF after the modification, I didn't measure it before unfortunately. I've been thinking about the potential for the dielectric constant of the separator to affect the readings, but I suppose as long as its consistent it shouldn't affect the validity of the relative results.These are cheap LCR meters that are a pleasure to use, the precision resistors are stable ceramic substrate cadock units and there is no calibration whatsoever. The EEPROM program is available online and as its mostly 4000 series logic there isn't any great reason why you couldn't keep this going forever. This took an hour and should add more flexiabiliy to it. Mine seems to be ex Australian Army, The faded sticker on top reads "Developmental Investigation Laboratory".

author: MegaVolt
author_rank: Frequent Contributor
timestamp: February 04, 2021, 02:23:32 pm
content: All pictures are dead
used Keithley 2001, does it worth ? - Page 1
Forum section: electronics / testgear

author: metebalci
author_rank: Frequent Contributor
timestamp: February 04, 2021, 02:26:51 pm
content: Hi.I found an offer for Keithley 2001, probably an old one, cosmetically not in a great condition but ok, last calibration was less than a year ago, it is around 1200 usd. I am looking for a better than average 6.5 or maybe 7.5, and I was thinking 34465A or 34470A new. What do you think ? Thanks.Mete

author: nightfire
author_rank: Frequent Contributor
timestamp: February 04, 2021, 02:51:26 pm
content: Well, here in germany a brand-new Keithley 6500 DMM is 855.46 Eur. excluding VAT- and a Keysight 34465A is 1,318.49 EUR excl. VAT- from a reputable seller that is also allowed to carry the new Brymen 786/EEV edition...So for 1200 USD for used hardware, you can probably get new equipment, and for around 150 extra, you get a fresh calibration.For me the price difference would be an indicator to buy new with guarantee, especially when the used device seems to be somewhat heavily used.

author: Kleinstein
author_rank: Super Contributor
timestamp: February 04, 2021, 03:09:32 pm
content: The Keithley 2001 is a rather old design with still only a LM399 ref. and kind of noisy.It was quite expensive when it was new, but technology has improved since than. Many units would need new caps - or may allready have them.It may have a few good spots with high resistance, but I don't see many good points compared to a modern 6 digit meter, like 34465 (or 34461) or DMM6500.

author: metebalci
author_rank: Frequent Contributor
timestamp: February 04, 2021, 03:18:03 pm
content: Thanks for the quick feedback.

author: 2N3055
author_rank: Super Contributor
timestamp: February 04, 2021, 03:21:06 pm
content: I would get Keysight 34465A in that price range..While Kethley DMM6500 looks like a very good deal for a very modern meter, there have been many problems with it, and later calibration is more expensive than Keysight....Keysight 34465A is very solid and just works...
Lecroy ScopeExplorer MacOS - Page 1
Forum section: electronics / testgear

author: iopq
author_rank: Contributor
timestamp: February 02, 2021, 03:18:47 am
content: hello my friends. i want to share my very simple macos app with you. app can take screenshot and save to file

author: dcarr
author_rank: Regular Contributor
timestamp: February 02, 2021, 05:38:01 am
content: That looks very cool!

author: iopq
author_rank: Contributor
timestamp: February 04, 2021, 01:55:12 pm
content: i updated the app.
8753C GPIB freezing and FW update - Page 1
Forum section: electronics / testgear

author: jadam
author_rank: Newbie
timestamp: August 20, 2020, 04:39:09 pm
content: I have a HP 8753C running 04.02 FW.I have a few issues where if I try to download S parameters of more than 200 points, or logarithmic sweep, I can crash the GPIB interface on the instrument.It continues working fine from the front panel, but no longer responds to commands via the GPIB interface. This happens both with my custom python scripts, and with the KE5FX VNA tools, so I think it is an instrument problem.I was contemplating trying to upgrade the FW to 4.12, (with files fromhttp://ftb.ko4bb.com/getsimple/index.php?id=manuals&dir=HP_Agilent/HP_8753_Network_Analyzer) however I was made nervous by this post on the Agilent/Keysight forumhttps://community.keysight.com/message/1539which suggests that I can't do that without upgrading the HW.However the official FW bug list (http://na.support.keysight.com/8753/firmware/history.htm#53c413) reads (to me) as if the newer FW will work with the old LO boards, but the newer LO board requires the newer FW. Does anyone have any insight?Are there any issues with loosing calibration if I try upgrading?Are there any guides to a FW upgrade that I've missed?Thanks!

author: hendorog
author_rank: Super Contributor
timestamp: August 20, 2020, 08:45:39 pm
content: I think you want to first determine which version of the phase lock board you have in your unit.According to the bug list 4.02 is the version the new board was introduced. Since you have that FW already then I guess you have the new phase lock board too.Should be as simple as whipping the top off and looking for 08753-60207 on one of the boards.

author: jadam
author_rank: Newbie
timestamp: August 24, 2020, 08:58:36 am
content: Oop - I actually have the 4.01 FW at the moment, so I'm relatively sure I have the old phase lock board.

author: justin010306
author_rank: Newbie
timestamp: February 04, 2021, 02:58:30 am
content: I just got an 8753C, the firmware version is 4.01, but I found that the phase lock board is 08753-60207, I don’t know if I can upgrade to 4.13
Good used tektronix tds3012b or siglent/rigol - Page 1
Forum section: electronics / testgear

author: rauldm
author_rank: Regular Contributor
timestamp: February 03, 2021, 04:15:11 pm
content: Hi, i have a dsox2002 agilent, hacked(thanks eevblog) i see a good used tektronix tds3012b, for 450 USD with original probes, is same price for new rigol/siglent, is good option today the tektronix? I worked 2 years with tds3054, is an incredible tool, i like the sample rate is not interleaved like siglent/rigol and My agilent. Regards
Fluke/Philips PM2260 Oscilloscope Signal Processing Software request - Page 1
Forum section: electronics / testgear

author: idrenth
author_rank: Contributor
timestamp: February 01, 2021, 06:23:37 pm
content: Hello everyone,I am trying to get the old software for the PM33xx series. I want to control PM3320, PM3323, and PM3340 with it.I can already control it with the commands, but I also want to see what the old software does with it and sniff what kind of command they send out. I would like to make a nice remote control that including the plots in the software, but not sure how they did that in the past to convert plot info again + get the original raw data from the memory so I can do maybe on my own signal processing on it.I know in the manual they talk about the PM2240 Test Team Software and the PM 2260 Oscilloscope Signal Processing Software.So far the original Philips training manual is talking about the PM2260 software and BINPROG to use with this scope I listed.I can plot the information to my screen but I would like to make maybe a new software to control the pretty good old scope.Would like to know that maybe others already made some software or know where I can find the original software and pdf manuals?Already thank you for the reply.REQUEST:PM 2240 Test Team Software + ManualPM 2260 Oscilloscope Signal Processing Software + ManualBINPROG softwareHow to convert Raw data from the memory to plot screen.

author: idrenth
author_rank: Contributor
timestamp: February 03, 2021, 06:16:44 pm
content: So, finally have some more info. I have a part from the PM2260 and saw they had 5 floppy disks. 4 only for asyst asystant dos software.I see now they use Asyst asystant+ dos. ASYST by Software Technologies, INC. (Macmillan Software Company) that also had a connection withKeithley in the past.So does someone has the software still and can arrange a copy for me because the company doesn't exist anymore and is abandonware now.also image from the PM2260 manual.
Viking TKP12-P-TS-100 connector for 33320 step attenuator - Page 1
Forum section: electronics / testgear

author: goaty
author_rank: Regular Contributor
timestamp: February 03, 2021, 01:18:47 pm
content: Anyone got a source for the 12 pin connector for the HP Agilent 33320 series programmable step attenuators ?Or a 3D-Printer model ?I think I need to make a model as cables seem to be unobtainable.Got cheap ones of ebay which work great after a bit of cleaning.Now I want to make a small box with battery and BCD switch and some electronicsc to select attennuation.Update: Made a crude plug from precision contact strips and a 3D printed housing. Works ok after some work with a 1.5mm drill on it.(Free metal contact from plastic of the contact strips and sand down the thicker end in Dreml)OpenScad:Code:$fn=50;module tr(x=0, y=0, z=0, X=0, Y=0, Z=0){translate([x,y,z]) rotate([X,Y,Z]) children();}module pin(){cylinder(d=1, h=7.5);cylinder(d=1.6, h=7.25);}difference() {cylinder(d=9.5, h=7.5);tr(-4.0, -4.0) cylinder(d=3, h=10);tr(-4.0, 4.0) cylinder(d=3, h=10);tr(5.3, z=5, Z=45) cube([3,3,10], true);d=2;tr(Z=45) tr(x=-d/2, y=d/2)union(){tr(x=0, y=0) pin();tr(x=0, y=-d) pin();tr(x=d, y=-d) pin();tr(x=d, y=0) pin();tr(x=d, y=d) pin();tr(x=0, y=d) pin();tr(x=-d, y=0) pin();tr(x=-d, y=-d) pin();tr(x=0, y=-d*2) pin();tr(x=d, y=-d*2) pin();tr(x=d*2, y=-d) pin();tr(x=d*2, y=0) pin();}}Thomas
Unit-T UTP-1305 - Page 1
Forum section: electronics / testgear

author: FrankyRC
author_rank: Newbie
timestamp: February 02, 2021, 08:45:23 pm
content: HyHow I had the need to purchase a low-cost bench power supply in best buy.My choice fell on the Unit-T model UTP-1305.Does anyone have experience with this model, or better yet have it in possession?I am interested in its disadvantages and advantages in practice, and of course the quality.I opted for it because of the appropriate characteristics, low prices, and the possibility of purchasing in local stores due to the possibility of warranty claims.
update SDS 2104X to SDS 2104X Plus - Page 1
Forum section: electronics / testgear

author: stefkpl
author_rank: Newbie
timestamp: February 01, 2021, 03:14:55 pm
content: Hi,Is it possible to "upgrade" the SDS2104X to SDS2104X Plus firmware ?I do a mistake when I buy my oscilloscope. I take the wrong decision.I need bode plotter for exempleThanks

author: tv84
author_rank: Super Contributor
timestamp: February 01, 2021, 05:08:41 pm
content: Totally different machines!

author: stefkpl
author_rank: Newbie
timestamp: February 01, 2021, 10:50:01 pm
content: No chance.I'm a burden!!!Thanks
Failed fan on Keysight DSO6000A scope - Page 1
Forum section: electronics / testgear

author: jayk
author_rank: Regular Contributor
timestamp: February 01, 2021, 07:47:22 pm
content: The fan on my trusty 12yo DSO6034A failed yesterday. The fan is already pretty quiet and there's apparently no thermal monitoring build into the scope so I didn't realize there was a problem until all four traces went out and I noticed the BNC connectors on the front were getting really warm. Luckily I had a replacement on hand - a Panasonic FBA09A12H - and it's super-easy to replace. Hopefully Keysight has added a temperature sensor (or has at least started monitoring the fan RPM) on newer scopes.
Hopi HP-9800 Power meter - Australian GPO modification. - Page 1
Forum section: electronics / testgear

author: aargee
author_rank: Frequent Contributor
timestamp: February 01, 2021, 02:41:07 am
content: Hello all,I've modified my HOPI meter to make it a bit safer (in my opinion) and give it a three-pin AUs GPO socket. I used a 3D-Printed adaptor block and a Jaycar panel-mount socket, I also removed the speaker terminals.Details herehttp://www.engineershed.com/3D Model herehttps://www.thingiverse.com/thing:4744289- Rob (yes, absolutely crap at keeping an up-to-date website.)

author: tautech
author_rank: Super Contributor
timestamp: February 01, 2021, 03:36:57 am
content: At the top of the TE board is a sticky thread that you should also post your HOPI mod in:https://www.eevblog.com/forum/testgear/replacement-knobs-feet-and-fittings-for-test-equipment/

author: aargee
author_rank: Frequent Contributor
timestamp: February 01, 2021, 05:33:21 am
content: Thanks Tautech, done.
Iso-Tech Idm 305 Calibration - Page 1
Forum section: electronics / testgear

author: dseyst
author_rank: Contributor
timestamp: March 10, 2020, 11:25:10 am
content: I recently got this multimeter on ebay. It's in great shape and all functions except dc volts appear to be in calibration. I searched but could not find the calibration/adjustment procedure. Does anyone have this information?

author: Tjuurko
author_rank: Regular Contributor
timestamp: March 11, 2020, 11:39:14 am
content: This device is very similar to the "APPA 305".There is a closed calibration program (I haven't seen it in the public domain, everyone sends it to a service center).You can try to writehttp://www.appatech.com/

author: JFJ
author_rank: Regular Contributor
timestamp: March 11, 2020, 11:22:30 pm
content: Your meter also looks like an "Ideal 61-635". The following line appears on page 20 of that meter'sTechnical Manual:Calibration is performed with the use of "CalWin 300" Software...You may be able to download CalWin300 fromHERE, but it's necessary to register and pass some sort of electronics knowledge test (in Russian).

author: Tjuurko
author_rank: Regular Contributor
timestamp: March 12, 2020, 04:18:59 am
content: http://files.remont-aud.net/schematics/45044_CalWIN300.zip

author: dseyst
author_rank: Contributor
timestamp: March 12, 2020, 04:37:39 pm
content: Thanks for the software. I got it installed and as soon possible I will attempt the calibration.

author: JuOOLs
author_rank: Contributor
timestamp: January 22, 2021, 12:23:42 pm
content: Hi, any chance you could re-post a link as I can't seem to download from that link anymore?

author: Tjuurko
author_rank: Regular Contributor
timestamp: January 25, 2021, 06:37:43 am
content: https://file.remont-aud.net/schematics/45044_CalWIN300.zip

author: JuOOLs
author_rank: Contributor
timestamp: January 31, 2021, 08:07:36 pm
content: Tjuurko - many thanks!!!!
Looking for PPM inc AVM-100 Null meter manual - Page 1
Forum section: electronics / testgear

author: Kosmic
author_rank: Super Contributor
timestamp: January 28, 2021, 02:17:57 am
content: Hello,I recently acquired a second hand AVM-100 null meter made by PPM inc. It's pretty much a modern version of the Fluke 845AB (same specs). Unfortunately it didn't came with the manual­. I contacted PPM inc (now Tegam) but unfortunately they don't have it either.If anybody has the manual for that instrument, that would be very helpful.Thanks!

author: MegaVolt
author_rank: Frequent Contributor
timestamp: January 29, 2021, 08:47:29 am
content: Are you planning to look inside?

author: Kosmic
author_rank: Super Contributor
timestamp: January 30, 2021, 05:27:54 am
content: Quote from: MegaVolt on January 29, 2021, 08:47:29 amYes I already did. To check the battery. And ... they were leeking a little bit. No damage though.

author: doktor pyta
author_rank: Frequent Contributor
timestamp: January 30, 2021, 09:55:54 am
content: QuoteWrong question.Kosmic, could You please share some photos of internals of the AVM-100?

author: Kosmic
author_rank: Super Contributor
timestamp: January 31, 2021, 01:10:14 am
content: Quote from: doktor pyta on January 30, 2021, 09:55:54 amSure. I was planning to do a deep cleaning and maybe change the input binding post (they are slightly broken). Will be taking picture at the same time.Will start a new thread when it's done and I'll let you guys know.

author: TheSteve
author_rank: Unknown
timestamp: January 31, 2021, 03:45:37 am
content: A thread showing before/after and all the details of it would be great.I assume replacement posts need to be low thermal.

author: Kosmic
author_rank: Super Contributor
timestamp: January 31, 2021, 04:07:35 am
content: Quote from: TheSteve on January 31, 2021, 03:45:37 amLook like they used Pomona 3770 (my unit is a bit different than the one on the picture). I'm deliberating if I should replace with the same or simply use what I have at hand.I got a lot of old low thermal binding post.

author: TheSteve
author_rank: Unknown
timestamp: January 31, 2021, 06:19:08 am
content: The 3770 is pretty crap. They like to crack and are just delicate overall. So if you have a better quality post I'd go with that.
Hantek 2000 Series Or IDSO1070A Software? - Page 1
Forum section: electronics / testgear

author: Bluegizmo83
author_rank: Newbie
timestamp: January 31, 2021, 05:06:31 am
content: Looking at the official PC software available for these two Hantek devices (2000 series and IDSO1070A), both software versions seem extremely bare bones and even missing needed features. I think it's weird that Hantek releases a standalone version of it's software for each scope model instead of just a single software with support for multiple models, but that's beside the point I guess...Does anyone know if there is any third party or open source software that will work with either of these two scopes?Hantek's software for some of their other scope models looks like it has some of the missing features (like x20 attention and CC65 settings for their current probe) but I'm assuming you have to use the software that's specifically for the model scope you have... For example, I doubt I could use their 1008C PC software with a IDSO1070A scope...
OWON B35T+ Multimeter - erratic temperature reading - Page 1
Forum section: electronics / testgear

author: jhyland87
author_rank: Newbie
timestamp: January 30, 2021, 02:10:28 am
content: I have an OWON B35T+ Multimeter that seems to have worked OK until now. I know it's not the best multimeter on the market, but I wanted something that could have basic multimeter functions, plus temperature, plus bluetooth. I use it a lot for nerdy chemistry stuff (which is when the temp/BT comes into handy) and sometimes when I'm playing with Arduino, or just diagnosing random electrical stuff.Like I said before, the temp feature has worked fine until now, but when I went to use it a few days ago, I noticed it mostly hovered around 25C, regardless of if I put it in boiling water or the freezer. I figured it was the actual thermocouple/sensor (since I only had 1 and abused the hell out of it), so I got a pack of 5. When they came today, I went to test it out and lo and behold... still the same odd readings.Heres a list of the odd characteristicsMostly hovers at 25C, but sometimes shoots up or down, then usually settles back at 25C againSame odd behavior even if the thermocouple is removedI don't know if it's in my head or not, but when I pick it up off the table and move it around, it shoots way above 100C down to below 0C, then back to 25C (almost like there's something loose inside... not sure)It doesn't seem like any other functions are out of wack, I just used it to debug a parasitic drain on my moms suburban evenReplaced the batteries, no differenceMaybe my Google-fu just isn't what it use to be, but when I searched for keywords related to this, I didn't find much (except for this thread on the forums here:https://www.eevblog.com/forum/testgear/owon-multimeters-opinions-likesdislikes-problems-hacksmods/)I know this forum isn't specific to OWON multimeters, but looking through some of the threads here, and noticing that some users on here do in fact have the same one, I figured it was worth a shot.Thanks in advance!-JEdit:This absolutely should have gone under the Repair section... I apologize. I can't find a way to move it though. Mods - Feel free to move it :-)

author: jhyland87
author_rank: Newbie
timestamp: January 30, 2021, 10:31:42 pm
content: Now that I think about it, when I was testing my moms battery on the SUV, I accidentally plugged the positive lead into the temp plug instead of the 20A plug... It looks like that may have fried the fuse. I just popped it open to verify.I assumed this wasn't the case since the other features worked fine. In my naïvety, I assumed there was only one fuse for the whole multimeter - silly thought now that I think about it.Ordering a new fuse now, will update once I receive it.Edit: I wrapped the fuse in aluminum foil to verify it was just the fuse, and it works just fine. It's a "1 A/250 V, fast-acting fuse", according to the manual.So anyone else who has this problem - Just replace the fuse :-)
Transformer symbol - Page 1
Forum section: electronics / testgear

author: mandor
author_rank: Regular Contributor
timestamp: January 24, 2021, 11:07:29 am
content: Hello!What exactly this symbol on a transformer means?Two vertical circles divided by horizontal line.Is this transformer suitable for galvanic isolation for power supply testing?Regards

author: gf
author_rank: Super Contributor
timestamp: January 24, 2021, 12:04:40 pm
content: "Trenn"-Transformator is basically the German word for isolation transformer.Still I would first check with an isolation tester whether the isolation is still intact.

author: mandor
author_rank: Regular Contributor
timestamp: January 24, 2021, 05:18:43 pm
content: I know about trenn word, but I'm being careful, especially because it is adjustable.I don't have anything better than a multimeter to test it with.Was hoping someone knows what pictogram o/o means. I can't find that one online, but the other ones that have a line mean isolation.

author: bdunham7
author_rank: Super Contributor
timestamp: January 24, 2021, 05:31:34 pm
content: Take it apart, you'll likely find a second transformer separate from the variac. It certainly appears to be an isolation variac unit, but you should test it before using it. A physical inspection of the innards (post a photo) would be a good place to start.

author: mandor
author_rank: Regular Contributor
timestamp: January 24, 2021, 05:34:18 pm
content: I will as soon as I buy it :-D

author: ledtester
author_rank: Super Contributor
timestamp: January 24, 2021, 11:02:21 pm
content: fwiw, here is a view of a RTT 2, at 1:51, which is described by the presenter as a isolation transformer and necessary if you want to work on power supplies:https://youtu.be/RaV_s4WgTxI?t=1m51sIt also has the "O|O" designation on the front.

author: mandor
author_rank: Regular Contributor
timestamp: January 25, 2021, 05:36:35 pm
content: Oh, I love that guy. I'm also into amateur radio, so I'm subscribed to his channel.So i bought the transformer. Paid 66 €.It looks hardly used and never opened to me.I think I'm going to be happy.There is no continuity between primary and secondary windings, says my multimeter.

author: S. Petrukhin
author_rank: Super Contributor
timestamp: January 30, 2021, 07:28:18 pm
content: This is a conventional autotransformer connected to an isolation transformer. The numbers on the disk are the voltage transfer coefficient as a percentage. A good purchase is a very useful thing.
Siglent SDS1204 save single shot data to PC ? - Page 1
Forum section: electronics / testgear

author: MathWizard
author_rank: Super Contributor
timestamp: January 30, 2021, 09:07:58 am
content: I'm looking at a broken HDD and saving screenshots in win10 of the browser interface, but that's really tedious. Is there actual software that I could be using like Labview that works with this ?Or is there a known way to transfer the data of a single-shot capture, over wi-fi, and save it on PC, so it could be plotted ? That's what I'd really like to do right now, save the whole single shot, so I could zoom in and look it all over, rather than taking a pile of seperate win10 scrnshots

author: tautech
author_rank: Super Contributor
timestamp: January 30, 2021, 10:23:35 am
content: Exactly which model do you have, SDS1204X-E ?Here's the programming guide:https://siglentna.com/download/17013/Normally one would set a slow timebase and either set a trigger type with a Single or STOP the scope and then zoom and pan through the capture however if you know what you're looking for in terms of a waveform maybe the Search feature can help.History can be useful too in that its memory is somewhat larger than the scopes memory depth and you can play back the record or view it frame by frame.Edit to add:Labview driver:https://int.siglent.com/upload_file/zip/Upper_computer/siglent_sds_1000_2000_series.zip

author: MathWizard
author_rank: Super Contributor
timestamp: January 30, 2021, 02:12:29 pm
content: Ok thanks TT, its a hacked 1104X-E S. So is it possible in the command line thing ? Or is it something a software engi/hacker would have to do because it's not supported then ?I forget about that playback thing on the actual scope, I need to figure it out.

author: tautech
author_rank: Super Contributor
timestamp: January 30, 2021, 07:47:51 pm
content: You can tackle problems in various ways with these DSO's, some dependent of the record length you need to capture where files can get large real quick.For post processing save files as BIN then convert to CSV as/if necessary.In Siglent NA's site you might want to have a scan through the many pages of operating tips, App notes and videos:https://siglentna.com/operating-tips/digital-oscilloscopes/sds1000x-e-series/https://siglentna.com/application-notes/sds1000x-e-series/https://siglentna.com/videos/sds1000x-e-series/
S-Parameter Test Sets 35677A and B: What are the practical differences? - Page 1
Forum section: electronics / testgear

author: Calvin
author_rank: Regular Contributor
timestamp: November 29, 2020, 10:42:07 pm
content: Hi,the HP 35677A and B are S-Parameter Test Sets in 50Ohms, resp. 75Ohms flavour.It appears to me that the only differences between both versions are two pairs of 6dB minimum loss pads (housed in the directional bridge casing??) together with their respective N-Type connectors for Ports 1 and 2, and a 12dB, resp. 24dB attenuator (seemingly within the power splitter casing)!??!Are the differential bridges as such exactly the same?See also the pics of user sixtymesseven athttps://www.flickr.com/photos/154275690@N07/albums/72157699120602134From the attached block diagrams it looks, as if one could build a 50R A-version from a 75R B-version by simply replacing the two directional bridges (63504, 75R) by the 65302, 50R types and to change the 24dB attenuator in the power splitter subassembly to a 12dB one.If on can´t get the 50R 63502 bridges it should then be possible to omit with the 2xpairs of 6dB pads within the 75R 65304 bridges and to replace the Port´s 75R N-connectors by 50R types.Is this assumption correct?Does anybody happen to have inside pics of the bridges and the power splitter?regardsCalvin

author: wn1fju
author_rank: Frequent Contributor
timestamp: November 30, 2020, 12:04:21 pm
content: For me, the practical differences between the two are, unfortunately, moot since I can't afford either! These things seem to go on eBay for several hundred dollars. Tack on a bunch more dollars to make up the necessary cables. Funny, because I only spent $69 to buy the HP 3577A network analyzer that these s-parameter test sets feed. Granted, the 3577A had a malfunctioning display, but it was an easy fix.

author: Calvin
author_rank: Regular Contributor
timestamp: November 30, 2020, 06:23:09 pm
content: Hi,compared to the huge effort that went into the Analyzer the Test sets are vastly overpriced, yes.B-versions typically go for considerably less than the A-versions though.I just ebayed one for 50€ (wo shipping) while the cheapest A-version start around 200€.So, besides the pure interest about what's inside of these items, it'd be a actually helpful information.regardsCalvin

author: Calvin
author_rank: Regular Contributor
timestamp: January 16, 2021, 04:27:20 pm
content: Hi,finally received the 50R directional Bridges (35677-63502) and installed them into the Test Set.50R:vers. 75R:Still to change is the Power Splitter/Attenuator from 24dB to 12dB attenuation.and the LTSpice Simulation of 75R-24dB resp. 50R-12dB version.Simulation shows good similarities in amplitude response and quite precise 12dB difference.Do you think the circuit would be useful7practical as simmed?regardsCalvin

author: Calvin
author_rank: Regular Contributor
timestamp: January 30, 2021, 11:48:52 am
content: Hi,really no one wanting to comment about the simulation results?regardsCalvin
Where to order 1x-10x probes in Canada ? - Page 1
Forum section: electronics / testgear

author: MathWizard
author_rank: Super Contributor
timestamp: January 28, 2021, 07:44:08 pm
content: I only have the 1 good set of Fluke probes, and 1 set of cheap probes just broke already, I should be hanging the probes over something, not letting them twist up in a box.What sort of price should I be paying for a few 200MHz probes in Canada/US? I have a few oscilloscopes, and only 4 working probes, and my Fluke 1 was 2nd hand (at least) and missing most the stuff for it.

author: Algoma
author_rank: Frequent Contributor
timestamp: January 28, 2021, 08:46:25 pm
content: What was the model of the existing probes?I often go with Mouser, Newark or digikey just to keep it simple. At least use their searches to narrow down available current model numbers and data sheets. Then search around for the best prices from there.Some of those "cheap" probes are just fine, you can abuse a whole box of them for the cost of a good set. Depends on your requirements. I'd be interested in a good quality 200Mhz set too if you come across a good deal somewhere.

author: Roger Need
author_rank: Regular Contributor
timestamp: January 28, 2021, 09:34:27 pm
content: Joeqsmith, who is a member of EEVblog, did a review of the Hantek PP-150 probes and found that they worked up to 350 MHz. even though they are sold as 100 Mhz. probes. You can see his YouTube review at this link.You can find them on Amazon Canada for $22 Cdn. eachhttps://www.amazon.ca/Hantek-PP-150-100MHz-Oscilloscope-Passive/dp/B07GNH99ZT/ref=sr_1_1?dchild=1&keywords=pp150+hantek&qid=1611869527&refinements=p_89%3AHantek&rnid=7590290011&s=industrial&sr=1-1Roger

author: MathWizard
author_rank: Super Contributor
timestamp: January 30, 2021, 04:55:48 am
content: It was 1 of my Siglent probes, under a year old. I need to play around with it see if its the cable, or connection. Eitherway even if I can't fix it, I can still re-use some of it at least.Yeah so this time I want heavy more durable probes, so probably more expensive.I have a parts order I was putting together on Newark, I should check there too.
Scope Tuner - Page 1
Forum section: electronics / testgear

author: IanJ
author_rank: Unknown
timestamp: January 29, 2021, 01:54:03 pm
content: Hi all,Was watching a few YT vids of Jerry Reed live on stage 1982 (great guitarist) and spotted something on stage in front of the bass drum I thought worthy of posting here.Looks to me like a Conn Strobotuner ST-11 Tuner and was used by a lot of the top bands of the 70's/80's era. A great bit of kit for it's day.Info:https://www.radiomuseum.org/r/conn_instr_conn_strobotuner_st_11.htmlIan.

author: cruff
author_rank: Regular Contributor
timestamp: January 29, 2021, 07:12:30 pm
content: Wow, it's been decades since I've seen one of those as a student, brings back fond memories.

author: DaJMasta
author_rank: Super Contributor
timestamp: January 29, 2021, 10:29:24 pm
content: Strobe tuners are still great for sensitivity, but they're so much more expensive to make and the difference is insignificant enough that most musicians just opt for digital ones now. You can actually get LCD digital tuners that emulate a strobe tuner to show finer variations in pitch than a needle would.
Peak Atlas wall brackets - Page 1
Forum section: electronics / testgear

author: cowasaki
author_rank: Frequent Contributor
timestamp: January 29, 2021, 10:15:26 am
content: Just in case anyone wants to hang their Peak Atlas testers on the wall I have created 3D printable wall brackets.The brackets are in twos or fours but they go together so you could print 3x twos for six in a line or a two and a four for 2x3 etcUploaded to thinyverse for storage.https://www.thingiverse.com/thing:4741886

author: Fraser
author_rank: Super Contributor
timestamp: January 29, 2021, 04:42:30 pm
content: Nice design. Thank youFraser

author: tautech
author_rank: Super Contributor
timestamp: January 29, 2021, 07:22:03 pm
content: At the top of this TE board is a sticky thread you should also post about your 3dp creation:https://www.eevblog.com/forum/testgear/replacement-knobs-feet-and-fittings-for-test-equipment/
If you could only power 1 device ? - Page 1
Forum section: electronics / testgear

author: MathWizard
author_rank: Super Contributor
timestamp: January 28, 2021, 08:20:58 am
content: If you could only have 1 piece of 'factory grade' test gear for the rest of your life, what would it be ? A DMM? An oscilloscope ? A PSUI'd want the scope

author: Specmaster
author_rank: Super Contributor
timestamp: January 28, 2021, 08:40:57 am
content: I'd go with a DMM as it would be used far more than a scope.

author: tautech
author_rank: Super Contributor
timestamp: January 28, 2021, 08:47:28 am
content: A DSO for sure.

author: MathWizard
author_rank: Super Contributor
timestamp: January 28, 2021, 07:52:20 pm
content: You know I forgot about resistance measurements and stuff, a scope would be pretty, a scope way more work, to measure stuff.

author: rstofer
author_rank: Super Contributor
timestamp: January 28, 2021, 10:52:15 pm
content: In my view, of conventional tools, the scope! Once signals start wiggling, we get interested in how they wiggle. Signals that don't wiggle aren't interesting. The DMM is useful, no doubt, but it is useless for SPI decoding or making an FFT. I'll concede that it is possible to get a Bode' Plot out of a DMM but you would have to have a signal source and that breaks the rules of the game.Only one gadget and allow for non-conventional? Definitely the Digilent Analog Discovery 2 (if they ever become available again). I have one and for 'learning' electronics, they are the best tool for the task. It gets far more use than my bench instruments.

author: Brumby
author_rank: Unknown
timestamp: January 28, 2021, 10:56:37 pm
content: A scope is pretty and nice and useful (and impressive to visitors) - but how many times do you reach for a multimeter versus the number of times you use a scope?

author: tautech
author_rank: Super Contributor
timestamp: January 28, 2021, 11:37:06 pm
content: Quote from: Brumby on January 28, 2021, 10:56:37 pmWell you can have both in a single device:

author: Fungus
author_rank: Super Contributor
timestamp: January 29, 2021, 04:53:19 pm
content: There's not much point in having any of those without a power supply to power the DUT.
interfacing TENMA 72-7730 to pc with V3.00 - Page 1
Forum section: electronics / testgear

author: FrankT1965
author_rank: Newbie
timestamp: January 28, 2021, 02:30:23 pm
content: Hi,anybody here who tried to connect the TENMA 72-7730 multimeter to a windows 10 pc running the pc interface software V3.00?I am still trying to get it connected - no luck so far.I need to record an electrical current for a few days with on off periods of 90min an 270 minkind regards

author: Kean
author_rank: Unknown
timestamp: January 29, 2021, 11:22:36 am
content: Yes, I have it working - at least on a 72-7730A.Did you enable the SEND mode by holding down MAX/MIN button for 2 seconds? Pressing EXIT will turn it off again.The one bug I see is if data reception times out, then you may have to click "USB Disconnect" to reconnect again.

author: HKJ
author_rank: Super Contributor
timestamp: January 29, 2021, 04:14:44 pm
content: Not all software will log for a few days, you may also have have problems with the battery lifetime.TestController can easily do that (can also do a few weeks) and I do support 72-7730 (I hope, it is based on another meter that is supposed to be the same).https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/

author: Kean
author_rank: Unknown
timestamp: January 29, 2021, 04:26:35 pm
content: Quote from: HKJ on January 29, 2021, 04:14:44 pmExcellent - I've been meaning to try it out myself.
Rohde & Schwarz ZVK Network Analyzer won't boot - Page 1
Forum section: electronics / testgear

author: paul@yahrprobert.com
author_rank: Regular Contributor
timestamp: June 14, 2020, 09:52:09 pm
content: Got the unit off of ebay about a year ago, worked fine. Then one day it won't boot. Nothing on the main screen or on either VGA ports. Don't see the floppy light or any other sign of power on self test.Power supply lines all have proper voltage and no AC as seen on an oscilloscope. Hard disk reads fine when plugged into my usb to IDE adapter. As far as POST, I don't hear any beeps but then I don't see a PC speaker anywhere. Found 4 smt fuses on the processor board but all read good. The lithium battery reads 3.6 V.Is there a jumper somewhere that I could look for POST beeps? There's a J1 and a JP19 near the CPU that are open.This is a pentium processor model. Disk is 6 Gig, Windows NT.Any ideas? Thanks!

author: paul@yahrprobert.com
author_rank: Regular Contributor
timestamp: July 03, 2020, 05:43:11 pm
content: Update: managed to find the main cpu board, 1043.4691 on Ebay. It was from a different R&S product, not the ZVK. When I put it in it booted but everything was wrong and then hung. There's one removable chip, U26, an AM29F010B flash chip, so I swapped that with the old one and presto! the thing boots up perfectly. It wasn't the Pentium chip, but something else on that board had failed.I'm gonna get a device programmer and copy that flash chip - I think it has all the personality and license information for my analyzer.Also, I tried to upgrade the HDD to an 80Gb Western Digital spinning disk, but it won't boot. So then I got this SD card to 44pin PATA adapter:https://www.amazon.com/gp/product/B07QNB6QLC/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1copy the disk image off of the hard drive with dd, then copy it onto the SD card, and it runs just fine.

author: zcabc
author_rank: Newbie
timestamp: January 28, 2021, 05:16:15 am
content: Hi Paul, I have a ZVK that won't do anything after pushing the power on button. The button does feel loose, so I suspect it could be the power button or the power supply itself. Do you know if you have to remove all the plug in cards to get to the front panel? I remove the screws in the front, but it seems the panel is held from back side with some screws too. I also removed the power supply, but not sure how to emulate the motherboard to try powering on. Any tip would be greatly appreciated.

author: zcabc
author_rank: Newbie
timestamp: January 29, 2021, 02:00:42 am
content: Managed to get to the front panel power button. That checked out fine. So back to something else - possibly power supply or the motherboard. Power supply fuse is fine. The power supply is Ascom 77-953-0300.
Extending the range on a late model E8285A CDMA Test Set - Page 1
Forum section: electronics / testgear

author: Tony_G
author_rank: Super Contributor
timestamp: August 01, 2017, 12:56:39 am
content: Hi All,Apparently the earlier models worked from 0.4 to 1000 MHz and at some point later in the production cycle, Agilent decided to save money by not calibrating the input module below 800 MHz (see the page onAmtronix E8285A). I received one of these in the great auction score of 2017 but apart from a project in the 900 MHz ISM band, I can't see the use for the limited frequency one.Does anyone know if there is a way to extend the range? I'm pretty sure I have everything I need to calibrate the attenuator myself (VNA, Sweepers, Calibrated Power Sensors, Cal Kits, etc) but I cant find any information on anyone ever doing this. I've sent an email to Amtronix but thought Iask here as well.Any suggestions or pointers?Thanks,TonyG

author: TheSteve
author_rank: Unknown
timestamp: August 01, 2017, 04:07:12 am
content: I believe you need older firmware which enables the lower frequency range. I have never seen anyone sharing the older firmware though - you're looking for 2.04 from what I remember when I researched them. I recall seeing someone selling the firmware downgrade on ebay a year or two ago.

author: ZL1CVD
author_rank: Regular Contributor
timestamp: May 03, 2018, 01:33:44 am
content: https://www.ebay.com/itm/123112056163

author: Tony_G
author_rank: Super Contributor
timestamp: May 03, 2018, 01:37:57 am
content: Interesting - Thanks for posting.Have you tried this? The biggest issue is that the calibration data won't match the actual attenuator and signal generator values (which is mentioned in the posting). Can these be user calibrated or is it a matter of getting a calibrated rom chip (so I'd need to measure myself and then write the rom).TonyG

author: Tony_G
author_rank: Super Contributor
timestamp: May 03, 2018, 01:39:13 am
content: BTW Amtronix did get back to me but then life intervened and I didn't get them the information required to work out the parts delta for my machine. Quality company they are.TonyG

author: ZL1CVD
author_rank: Regular Contributor
timestamp: May 24, 2018, 07:06:00 am
content: Not aware of any user cal procedure for E8285A down-converter. And it does work.

author: tabajaralabs
author_rank: Regular Contributor
timestamp: January 29, 2021, 06:32:29 am
content: Does anyone has the A.02.04 bin card images (the firmware)I'm looking for that for AGES, but no one has (or will to share) these.If you bought the firmware on the net and has the two PCMCIA cards, and a PCMCIA capable laptop, I can guide you to copy the cards and make it avaiable to the comunityThanks in advance
Development menu on TDS 5xx/6xx/7xx Scopes - Page 1
Forum section: electronics / testgear

author: dxl
author_rank: Regular Contributor
timestamp: January 28, 2021, 10:00:06 pm
content: I'm not sure whether i have ever shared that information. About 10 years ago when reverse engineering the tektronix firmware and writing tekfwtool, i noticed that there's a 'Development Menu' built-in in the Tektronix Scopes. I did a repair of a scope these days, and couln't remember how it was activated, so i did take a look again.In fact it's just a:_libManagerWordAtPut(0x2009b,1)on the debug console. The same will likely work via GPIB.This gives you an additional 'Devel' Menu in the Utility Menu. See the attached picture how it looks like. You can manipulate a lot of DACs, peek & poke memory. And *never* press the coldstart button, as this will erase your calibration data in the NVRAM. You have been warned.EDIT: i'm not sure whether 'Cold start' would also erase cal data with the calibration switch in the disabled position. I don't want to try it on my scope. If anyone feels like trying, let me know what the result is.