hybridfree/eevblog-posts huggingface dataset:
Connecting a laptop to an instruments web interface: "This site can't be reached - Page 1
Forum section: electronics / testgear

author: Sören_Marodören
author_rank: Contributor
timestamp: January 19, 2022, 09:02:28 pm
content: Hi,At home I easily connect my laptop to e.g. my oscilloscope via LAN so I can control the instrument and even see information on its screen. Both the laptop and the instrument is connected to the same hub. I just use the IP address the instrument got from the DHCP server in the hub and type that into a web browser on my laptop. Usually it is a 192.168.x.x address.At work at do the same, connect the oscilloscope to the LAN (via cable) and then use the IP address it was assigned to in a web browser.Here the address is a bit different and can be something like 124.44.x.x. (I don't remember exactly.)It works very good every time.But if I bring my job laptop home and try to connect it to the oscilloscope on my network, it most often don't work. (I have got it to work a few times as a first attempt after restart or so. But it only work for a couple of minutes.)Instead I get a message in the browser saying "This site can't be reached". See attached picture.I can use my printer at home without any issue.I suspect that it is related to security settings in the laptop. My work take security very seriously.Does anybody know how to get my job laptop to work with my instruments at home?Due to Covid I do a lot of job related work in my home lab. It would be nice to be able to do everything that I'm used to do with the instruments.Can I change settings in my hub or do I need help from my IT department to change settings in my laptop?Cheers,/Sören

author: tv84
author_rank: Super Contributor
timestamp: January 19, 2022, 09:25:06 pm
content: Quote from: Sören_Marodören on January 19, 2022, 09:02:28 pmNothing you can do in your hub will solve the problem. If your company "takes security very seriously" then you should present the problem to your IT dept and ask for their help in changing the laptop settings, if possible.

author: Whales
author_rank: Super Contributor
timestamp: January 20, 2022, 12:03:00 am
content: Your company might be running a fullfunnel VPN on your laptop. This means it tunnels all traffic to your company, rather than letting it go over your LAN (with a few exceptions). Check the IP addressed on the laptop itself when it's at home, see if it has more than just an IP in your LAN range.If so: yep, gotta talk to your company. It's their setup, I wouldn't recommend working around it without their consent.
DSA832E-TG - Page 1
Forum section: electronics / testgear

author: Armando1989
author_rank: Contributor
timestamp: June 01, 2021, 09:17:03 am
content: Hi everyoneDoes anybody know if dsa832e-tg can be hacked same procedure as for 815?, im not sure the actual board is same when it comes to th fram.thanks in advance guys

author: Armando1989
author_rank: Contributor
timestamp: January 19, 2022, 09:09:14 am
content: And the answer is yes... Same rtc chip part and same solder link to be done between pin 7 and 8Tried myself. Pity is i did modification when 30 mins for license expiration, thus using these trials last just 30 mins then need to restart analyzer to reset the license and use again.Thanks
Tektronix 468 GPIB output - Page 1
Forum section: electronics / testgear

author: WaveyDipole
author_rank: Frequent Contributor
timestamp: January 03, 2022, 09:31:35 am
content: Does anyone by any chance have any information on the format of the output from the Tektronix 468 GPIB option? I have so far not been able to find any information online or any program that will process the data and display the output screenshot.

author: WaveyDipole
author_rank: Frequent Contributor
timestamp: January 03, 2022, 06:21:21 pm
content: It turns out that the information I am looking for is in the user rather than the service manual which I now have a copy of. NX-1997 also pointed me to a Python program here:https://github.com/silverchris/Tektronix-468-GPIB-PlotterHopefully this is all I will need.

author: jrseattle
author_rank: Newbie
timestamp: January 19, 2022, 02:19:22 am
content: I was able to talk to a Tektronix 468 (with GPIB option) using the micro-pro version of AR488 (thanks so much for this design).The program I used was the Prologix Configurator from KE5FX (this means I had to change the AR488 version string to match prologix).The 468 was configured as device 3 and the TALKONLY option was DISABLED.Commands I issued before turning the 468 on:++addr 3++srqauto 1++eor 7The 468 (which is ONLY a talker, not a listener) issues an SRQ value 1 on startup (called Power On SRQ). the AR488 handles this SRQ using these settings.To get a WF from the 468, you need to push the "Transmit" button on the side, followed by a ++read command (in the Prologix configurator). The 468 will then send a large parameter string in ascii, followed by the WF binary data (512 bytes if 1 channel, 256 bytes if 2 channels active). If SAVEREF is active, the saved WFs will also be sent.Of course, the above can be done with a terminal program too, but I hope to add 468 support to the 7470A program in the KE5FX bundle.Has anyone tried to use the Python program listed above? My python skills are currently minimal.Is there anyone interested in how the digital portion of the 468 works internally? I have decoded most of the 8085 code and am able to debug the scope using MON-85.
Load buzzing - Siglent SSA3021X Plus / SVA1032X - Page 1
Forum section: electronics / testgear

author: eloso
author_rank: Regular Contributor
timestamp: January 18, 2022, 07:16:02 pm
content: I haven't used my SSA/SVA for a while but it has been in standby mode i.e. power connected, and on/off button illuminated. The unit suddenly started buzzing extremely loudly. Loud enough not to be just a nuisance but to be cause of real alarm - like something is about to go bang inside there. I was three rooms away when it started and I came to the lab to investigate.I pulled the mains cable out the back and the buzzing continued for say, 5 seconds then stopped.It sounded like 100hz. Certainly not much higher.The unit is 9 months old.This is the worst kind of happening of course - it seems dine now on reapplying power. I could send it back and it could sit on some tech's bench for another 9 months and the problem not occur again. I shall conitnue to use it but may not leave it powered when I am not with it.Anyone else ever had this fault ? I am guessing it is some kind of smps happening, so even if it wasn't with an SSA, experience of this kind of problem with any kit might be interesting. Or perhaps just some ideas about what could cause it ? The switcher will operate at much higher frequencies than what I heard, but did the frequency of the switcher drop to 100hz or so ?Its all a bit of pain, expecially as the unit has been upgraded so I don't want to send it back.I have asked this before, but no-one ventured to reply - I have a full memory backup of the machine state when it was purchased - done with a script kindly provided through this forum. I have not seen how to recover this backup and really don't want to start playing around manually trying to restore mtd partitions without some insight into how everything is structured. Anyone know how to do the restore ?Kind RegardsEloso

author: nctnico
author_rank: Super Contributor
timestamp: January 18, 2022, 07:19:16 pm
content: Just send it back for repair under warranty. If you didn't open it, then there is nothing to worry about. Trying to undo the hack is only going to make things worst by the look of it.

author: tautech
author_rank: Super Contributor
timestamp: January 18, 2022, 07:35:55 pm
content: Interesting. PSU problems are not unknown but rare.Do you have a variac by any chance to check what it does with a 110VAC supply ?AFAIK these use the 4ch X-E DSO PSU and reducing the input to 110VAC did shut up a much older one but it's hardly a long term solution.https://www.eevblog.com/forum/testgear/siglent-ssa3000x-spectrum-analyzers/msg3619647/#msg3619647Later discussion post 1683 and on.Your local reseller should be able to perform the warranty PSU swap.
GPD-3303S  Encoder Acceleration Firmware - New Version - Page 1
Forum section: electronics / testgear

author: rfdes
author_rank: Regular Contributor
timestamp: January 18, 2022, 06:44:44 pm
content: Hi -I've owned a used GPD-3303S power supply for several years and have never been happy with the rotary encoders and what appeared to be contact bounce issues. Quickly setting the voltages/currents seems troublesome and frustrating. I discovered that the problem is not de-bouncing issues (at least in my case) but the algorithm used to implement the encoder acceleration. When tuning the encoder quickly, the value would increase so rapidly that I would typically overshoot the value. Very annoying in my opinion, so the goal was to eliminate this annoyance.To my knowledge, V2.11 is the latest firmware version for this supply. If others have a more recent version I would be interested in getting a copy. In any event I took on the task of reverse engineering the acceleration algorithm firmware and want to share my results. The attached file is a new version of V2.11 that can be loaded using the Microchip Boot loader per the user manual. I modified the algorithm such that a quick turn of the encoder will increment the display by either 1V/1A (Course) or 10mV/10mA (Fine). A slow turn of the knob retains the 0.1V/0.1A (Course)/1mV/1mA (Fine). In addition, a fast turn will zero out the 100mV/100mA (right 2 digits). I find this modified firmware much more user friendly.I've also attached a copy of the V2.11 firmware in case you need/want to revert back to the original firmware. If anyone has any other ideas I would be interested in hearing from you.ThanksJim
UTD 2052 Oscilloscop: Read data from .sav file - Page 1
Forum section: electronics / testgear

author: SebNik
author_rank: Newbie
timestamp: January 18, 2022, 05:41:45 pm
content: Hi,I just recently got an oscilloscope and was happy to try it out. Now I have a problem with reading the data. The model I am using is the UTD2052 50Mhz scope.I can save the data to a USB drive in the format .SAV (file is in drive linkhttps://drive.google.com/file/d/19wGKD6tpcHn-gJO2bQ3vKli09ajNdcbZ/view). Now I can't seem to find any software to convert this file into Excel or CSV. The only software that works is a WaveAnalyzer (image).But I need the raw data. Any ideas how to open the file?Thanks
Velleman K7103 Compatible Software? - Page 1
Forum section: electronics / testgear

author: Chris56000
author_rank: Frequent Contributor
timestamp: July 19, 2021, 10:06:02 am
content: Hi!Does anybody know of any good full versions of DSO Software Compatible with the Velleman K7103 please?I won a K7103 kit n.o.s. but the software was missing and Velleman have long deleted it!There used to be something called Scope-IT Professional fromhttp://scope-it.nl/which was compatible that wasn't too expensive, but the website is dead and long gone - the Wayback Machine archived the setup file but I can't buy the activation code any more!Searching for "PC oscilloscope software" only gets me useless animated demo rubbish or soundcard-type rubbish, both of which are useless with this kit!Chris Williams

author: Damien9062
author_rank: Newbie
timestamp: January 09, 2022, 04:02:13 pm
content: Hello, if you are still interested I can send you the winDSO application which is the original software working with the K7103 kit. You can contact me by mail.To the pleasure

author: simba15
author_rank: Regular Contributor
timestamp: January 18, 2022, 02:47:12 pm
content: If you can find it please post for others.Not alot left in the world for DOS applications.

author: simba15
author_rank: Regular Contributor
timestamp: January 18, 2022, 03:28:30 pm
content: So found a few links here but seem to never download. ( tried all browsers and logging in)https://www.box.com/s/071af3526c4e5ec4427bhttps://forum.whadda.com/t/k7103-pc-scope/5838I think this is the Windows software is here:velleman.eu/images/tmp/WinDSO_FG32_v123.zip

author: simba15
author_rank: Regular Contributor
timestamp: January 19, 2022, 03:36:33 pm
content: So managed to get this a new link from Velleman.https://app.box.com/s/071af3526c4e5ec4427bI got the Schematichttps://app.box.com/s/1dhdp74if8eopep08e1ic66vicmhbuk2I really like the idea of an DOS PC scope! I have many of the parts on hand (still need the A/d converters (8703, Or could upgrade)Any real experiences with it?
SMTmax CA18303D power supply turn-on spike - Page 1
Forum section: electronics / testgear

author: TD-Linux
author_rank: Contributor
timestamp: January 18, 2022, 02:23:53 am
content: I have had a CA18303 30V/3A dual linear power supply for a while. However it's burned me enough times that I thought I'd warn people about it. There's not many search hits for it, but I suspect it's the same internals as many other cheap linear power supplies.The main issue with it is a massive turn-on spike when in parallel mode - I've measured it at 18V when set to 5V, though it probably sometimes goes higher as I've blown up chips rated for 28V with it. In theory, I can remember to attach and detach the load before turning it on, or always turn it from 0V to the setpoint. In practice, I've forgotten one time too many, and I'm about to replace it with a much nicer switchmode supply.I've also previously managed to fuse the serial/parallel relays and replaced them. I also broke the handle at one point and replaced the cracked plastic with a 3D printed part.Bums me out a bit to waste such a nice toroidal transformer and otherwise decent construction on a flawed design.
UT39E+ - Page 1
Forum section: electronics / testgear

author: metan
author_rank: Newbie
timestamp: January 17, 2022, 08:00:16 pm
content: Hi I've bought UT39E+ from aliexpress (Official UNI-T store) and did some measurements to check the precision. The results are disappointing, as far as I can tell it's outside the specified precision due to non-linearities at least in the 200mV range and of course the seller denies it. It seems that there are several voltages around which the measurements jump up, then meet at the center and jump down.I've did a summary of the findings athttp://metan.ucw.cz/UT39E/UT39E.htmlTLDR; Do not buy UT39E+ I should have probably bought the AN870 instead.
Tektronix TDS3000 schematics including power supply - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: January 17, 2022, 05:39:57 pm
content: For anyone on Tekscopes they are probably aware of this.......https://groups.io/g/TekScopes/topic/schematics_for_a_tds_3052/88295382?p=,,,20,0,0,0::recentpostdate/sticky,,,20,2,0,88295382,previd=1642440761430914151,nextid=1642291891044616596&previd=1642440761430914151&nextid=1642291891044616596
How to unlock keys on PLZ153W electronic load? - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: January 17, 2022, 02:54:35 pm
content: Hi,How to unlock keys on PLZ153W electronic load?tried everything..nothing works..manual says shift and stop keys, but there is no stop keyhttps://www.atecorp.com/atecorp/media/pdfs/data-sheets/kikusui-plz303w_manual.pdf

author: Johnny10
author_rank: Frequent Contributor
timestamp: January 17, 2022, 04:16:23 pm
content: The stop key is in the flip down compartment at the bottom of the keypad
BRYMEN BM857S or other multimeter - USB connection & own JAVA program - Page 1
Forum section: electronics / testgear

author: bipolunipol
author_rank: Contributor
timestamp: January 17, 2022, 06:34:42 am
content: Hello,I am looking for a multimeter that can be connected to the computer. I would like to write an application (e.g. in JAVA) that will take readings from the meter and then process it appropriately.I am interested in measuring, in addition to the standard parameters, capacitance of capacitors (and maybe inductance, but it is not necessary).I read a bit on the Internet about meters and the BRYMEN BM857S multimeter is very often recommended. It has the ability to connect to a computer - you can use the attached application after connecting. However, it can be problematic to connect this meter to your own program...So I would like to ask what kind of meters you recommend (price range of this BRYMEN and with similar accuracy), so that such a meter could be easily operated via serial interface in e.g. JAVA language?

author: HKJ
author_rank: Super Contributor
timestamp: January 17, 2022, 08:06:30 am
content: New Brymen meters uses a HID interface, that is very tricky to use from Java, older meter uses a serial interface. In both cases the transmitted data is display segments, not ascii format.You can also check out:https://lygte-info.dk/project/TestControllerIntro%20UK.htmlthat program can log and do some data processing with a lot of different multimeters.

author: Fungus
author_rank: Super Contributor
timestamp: January 17, 2022, 11:02:54 am
content: Quote from: bipolunipol on January 17, 2022, 06:34:42 amIt's a good meter.Quote from: bipolunipol on January 17, 2022, 06:34:42 amThe meter appears as a serial port. You can open it and read the data, no problem.This thread discusses the programming:https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/
Micsig ATO1104 clicking noise - Page 1
Forum section: electronics / testgear

author: wiki38andy
author_rank: Newbie
timestamp: January 15, 2022, 10:41:57 pm
content: Hi,I bought a month ago a Micsig ATO1104 and recently a clicking sound like a relay one comes from inside when switch the voltage range between 200mV to 500mV or from 2V to 5V on any channnel. It looks like it came after I connected CH1 to AUX OUT channel to see what kind of signal it is. I am pretty sure I never heard this sound before or maybe I did not noticed. That is why I open this tread to find out if this relay click is normal or something got wrong and what this is for.Thank you.

author: electr_peter
author_rank: Unknown
timestamp: January 16, 2022, 10:53:37 am
content: Clicking sound comes from input range switching relay (separate for each channel) when input range is changed between low/high ranges. Sound is normal and expected in Micsig as well as in most digital scopes.

author: Fungus
author_rank: Super Contributor
timestamp: January 16, 2022, 11:55:52 am
content: Quote from: wiki38andy on January 15, 2022, 10:41:57 pmIt's always done it, you just never noticed.PS: All 'scopes do it.

author: wiki38andy
author_rank: Newbie
timestamp: January 17, 2022, 12:00:13 am
content: Thank you everybody very much for the answers.
Any experience with UNI-T UTD2102CEX-II DSO? - Page 1
Forum section: electronics / testgear

author: edovis
author_rank: Newbie
timestamp: January 16, 2022, 08:24:49 pm
content: Hi, everybody!I'm looking forward to buy this oscilloscope. Despite it was released a few years ago, I haven't found much info/reviews about it. All I found out is that this scope is a better (really better) version of the well-known UNI-T UTD2102CEX.Do you have any experience with it?Cheers!
HP/AGILENT 70950A OSA - Page 1
Forum section: electronics / testgear

author: jfphp
author_rank: Regular Contributor
timestamp: December 22, 2016, 09:04:56 pm
content: Hello,Did anybody try to repair this optical Spectrum analyzer plug in for the MMS/70K system ? Is there any CLIP available ? I have a slit failure. Thank you

author: Paul B
author_rank: Contributor
timestamp: January 15, 2022, 03:45:03 pm
content: Dear SirI haven't managed to find a clip or service manual for the optical spectrum analyserbut there are 5 user manuals on the groups io HP 70 K siteregards Paul
BBC Goerz Metrawatt M6003 oscilloscope manual? - Page 1
Forum section: electronics / testgear

author: Axtman
author_rank: Regular Contributor
timestamp: January 16, 2022, 01:55:50 am
content: Hello,I have a BBC Goerz Metrawatt M6003 60 MHz oscilloscope that I needs calibration adjustments. Does anyone have the manual? (I have heard that this could be the same as the Hameg M6003 oscilloscope.)Thanks.

author: TaylorD93
author_rank: Regular Contributor
timestamp: January 16, 2022, 05:49:23 am
content: That Is a rebranded either HAMEG 604 or the 605 model.I have a 605 which does look identical to the photos I've found online of your 6003 model.Note that for the 605 there are a few copies of the service manual I think one is dated 1983 the other is 1985.Have a look here, the guy who runs the site is Ex HAMEG.https://www.sky-messtechnik.de/Think there is a downloads tab somewhere for memory
AC and DC Hi Pot testing - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: January 14, 2022, 11:46:29 pm
content: Hi,Suppoisng your test instuctions for an offline SMPS say flash test at 2100VDC for 10 Seconds. (input to output)...but you only have an AC flash tester.-What AC voltage do you use for the 10 seconds?

author: Martin72
author_rank: Super Contributor
timestamp: January 15, 2022, 12:17:23 am
content: Hi,Appx. 1500Vrms.Sometimes we have the opposite situation, a DUT should be testing with an AC voltage of xyz Vrms for say 1 minute.We use a DC highvoltage tester with adjustable testing time.So we calculate the value Urms*SQR2 = DC value.Remarks:-When the hipot test is a repeatable type (was already done, was not the first one), testvoltage should be reduced to 80% to avoid damage - A highvoltage test stresses the components.-Using AC instead DC voltage could make problems when you test against earth/gnd (possible capacitors against gnd for emc reasons)-Could also fail when testing input vs output - Some smps got a cap between input and output, when testing with dc, cap will be loaded once, when testing with ac, cap will be loaded permanently, a current will flow permanently.-Do not exceed the test-current, hopefully this current is mentioned.

author: TaylorD93
author_rank: Regular Contributor
timestamp: January 15, 2022, 05:39:34 am
content: BS EN 61010 for example does State certain test conditions for safety testing and does include some options depending on the circuitry and type of equipment.But obviously if the psu you are testing is compliant with another standard its best to read up on the requirements of why a DC hipot test is used.I know at my work our products have alot of filter caps (3Ph inverter drives) so we do DC hipot at 2kVDC used to be 2.2kVDC

author: Faringdon
author_rank: Super Contributor
timestamp: January 15, 2022, 01:01:10 pm
content: QuoteThanks, i always took it that anything over 500VAC will stress the components and cause cumulative damage?

author: coromonadalix
author_rank: Super Contributor
timestamp: January 15, 2022, 03:24:27 pm
content: lollWe have to test MeanWell medical stuff ast 4000 vac for an smps ac adaptor, and they must suffer and pass 1 minute of testAt 4010 vac they blow loll, only 6 in 2 years have failed, BUT we've seen some spikes could pass thru themhad to add some surge/spike suppressor diode in a revised citrcuit designOther stuff say with an xformer etc ,,, have to be tested at least at 1600 vac and doesn't go over 5 ma current test for 5 second period of timeIso related stuff loll
Electronic dynamic load - what to get? - Page 1
Forum section: electronics / testgear

author: FriedMule
author_rank: Frequent Contributor
timestamp: January 15, 2022, 06:15:32 am
content: I'd like to be able to make "arbitrary" load profiles, either via a graphical GUI on the PC or the unit. I need about 150W (5A 30V) or better. I would love 60A 40V, but this is properly insanely expensive!?

author: LaurentR
author_rank: Frequent Contributor
timestamp: January 15, 2022, 06:35:41 am
content: How quickly do you need the changes to happen?

author: FriedMule
author_rank: Frequent Contributor
timestamp: January 15, 2022, 02:18:00 pm
content: I would like for it to be within 10-20 ms from 0 to the voltage / current I select.
Autotransformer maximum current - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: January 14, 2022, 10:58:44 pm
content: Hi,This 240VAC caroll & Meynell Autotransformer is obselete now.Does anyone know what maximum current it can provide?

author: tszaboo
author_rank: Super Contributor
timestamp: January 14, 2022, 11:06:55 pm
content: However much is written on it.

author: bob91343
author_rank: Super Contributor
timestamp: January 14, 2022, 11:43:04 pm
content: I would weigh the unit and look in catalogs for similar sizes. That should give you a fairly close estimate of its rating.

author: Martin72
author_rank: Super Contributor
timestamp: January 15, 2022, 12:22:11 am
content: QuoteLook at it´s type shield...

author: cdev
author_rank: Super Contributor
timestamp: January 15, 2022, 01:33:23 am
content: I usually abbreviate the name to "Variac" as here in the US that was the main manufacturer of them.From the pic I would guess 500 to 1000 watts, but I see a label on there and bet that label carries the info you want.Better to err on the side of caution. Put a thermometer on it if it seems to be getting too hot at what you are using it for and then back off if its getting too hot inside (starts smelling like burning plastic, probably) That one looks fairly robust as they go.A variac is very useful thing to have when using old equipment for the first time in awhile - to prevent old, dried out capacitors from blowing up. (bring the voltage up gradually to reform" them. ) Pays for itself, IMHO.That one looks large enough for 95% of the electronics I use. If you do a lot of electronics, its super useful. I would keep it. One good thing to do if you have electronics you rarely use is this, once every two or three years plug equipment in, and then slowly apply power up to rated voltage bit by bit.; Then leave it there for a while. Then assuming nothing has failed, you're done. The variac should be fused.
Teardown of Siglent SDG810 (and some questions) - Page 1
Forum section: electronics / testgear

author: nunoavic
author_rank: Newbie
timestamp: January 15, 2022, 01:03:45 am
content: Hi everyone, this is my first post here and after reading some of the reviews here and comparing the specs and price, I decided to buy a Siglent SDG810 signal generator to complete my home lab. Bought at 224 euros with shipping and tax from siglent.eu.Overall the unit is very nicely built, but has 2 small issues: sometimes the generator glitches and the green output light goes off and instead the trigger green light comes on. Whenever I press the output button, the trigger green light button switches (and one of the relays clicks) but not the output light button as it should. The solution is everytime that happens, I have to factory reset the generatorThe second problem is more concerning as it demonstrates some issue at a hardware level. When set to DC output mode (via Utility menu), or very low output frequency (<30Hz) and the output is shorted, the backlight screen blinks at the configured frequency, or in the DC case, gets dimmer and dimmer as the output voltage gets more negative. This effect is more pronunced at voltages lower than -3V through -10V (minimum voltage) at which the screen is almost impossible to see. It has been shipped with the latest firmware: 1.08.01.15If anyone has experienced these issues please message me or write here. Thanks!P.S.: I have also managed to open the chassis without voiding the warranty sticker (don't tell Siglent) and have attached some pictures of the internal construction and electrical components. I guess this is Rev. E hardware:

author: nunoavic
author_rank: Newbie
timestamp: January 15, 2022, 01:08:44 am
content: Sorry for another post, I didn't know there was such a short storage limit on attachments. Here is the linear regulators part of the circuit:
Setting particular resistance value on PLZ303W Eload? - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: January 14, 2022, 10:50:16 pm
content: Hi,Ive been using the PLZ303W eLoad. Trying to set, say 2.88R of resistance is a nuisance...you have to twiddle the dial, and its difficult to do it exactly.Is there some trick for this?PLZ303W manualhttps://www.atecorp.com/atecorp/media/pdfs/data-sheets/kikusui-plz303w_manual.pdf
Keithley 2302/2306 Battery Simulator unexpected oscillation - Page 1
Forum section: electronics / testgear

author: Nevada
author_rank: Contributor
timestamp: January 14, 2022, 07:26:19 pm
content: I have a Keithley 2302 power supply, which has a strange behavior: I use a 2 metres long, 4 core cable (sense +/-, out +/-) instead of battery to powering a low power unit with a 1uF input cap and a 3V LDO, but the 2302 output start oscillating when I put it ON. The output bandwidth setting is in LOW. There is no problem if I use a Keithley 66321 Battery Simulator or a conventional power supply.Additionally I find a similar mention on the nethere.What do you think? Is Keithley not so good design, or just too fast even in the LOW bandwidth mode?

author: 2N3055
author_rank: Super Contributor
timestamp: January 14, 2022, 08:39:16 pm
content: Quote from: Nevada on January 14, 2022, 07:26:19 pm2 meters long cable?? With a capacitor at the end ? Low ESR capacitor (ceramic by chance?) And basically no load...Connect a scope. Add more capacitance(try 10uF alu electrolytic).. observe... Add a capacitor in series with 10 ohm resistor (so it has large , not low ESR) in parallel. Observe.

author: Nevada
author_rank: Contributor
timestamp: January 14, 2022, 08:48:28 pm
content: Yep, it is not the best case, but there is no problem with other PS model, and that's why the sense pins are there. By the way, the problem doesn't exist when I use local sense jumpers at the backplate connector directly.The cap is an MLCC.I'll try your suggestions.

author: 2N3055
author_rank: Super Contributor
timestamp: January 14, 2022, 09:19:28 pm
content: Yep I know but all PSU are different.Also make sure to twist sense cables and power cables but separately, sense together and power together.See manual.
Wilton 6NF50 SWR Bridge - Option 1 Vs. Option 2? - Page 1
Forum section: electronics / testgear

author: AJ3G
author_rank: Regular Contributor
timestamp: January 15, 2022, 07:43:49 pm
content: All:I managed to get my hands on a Wiltron 6NF50 SWR/Return Loss Bridge. I have managed to open it up, and repair it as when I received it the RL response was about 21dB. This turned out to be from cracked solder joints around the two 50 Ohm Resistors, so I assumed it was dropped. I also noted two of the response flatness tuning adjustment set screws had been removed (used for altering capacitance), so I have ordered some from McMaster.On the case there is an indication of Option 1, which guarantees 40dB of RL Response Minimum. There is yet another check mark for Option 2 on the case which would would be for 46dB of RL Response Minimum.Does anyone know what they did to increase the RL in this SWR Bridge to make it an Option 2 device? I do not think it’s more tuning, or time spent tuning, so I am left with either more turns on the chokes inside, or better 50 Ohm Resistors (matched to 50 ohms closer), with better temp coefficient.Rich
Borked Agilent ESA Firmware Upgrade **SOLVED** - Page 1
Forum section: electronics / testgear

author: veedub565
author_rank: Frequent Contributor
timestamp: January 14, 2022, 02:28:48 pm
content: I have an Agilent E4411B ESA Analyser. It worked perfectly, but only had 16mB flash memory and small RAM. I decided to do the memory and firmware upgrade. I bought a used, but known good, 32mB flash stick and RAM from another ESA.I put the new flash and RAM in and powered on my ESA. I just got the blank white screen.I have a set or original OEM discs for the firmware upgrade. So I put the first disc in and re-booted. The drive LED briefly lit up but still white screen of death.I erased the dynamic and flash memory following the procedure in the manual, tried the firmware disc again, still same white screen of death.I refitted the original flash memory and RAM... surprise, white screen of death!The heartbeat LED is on continuous as is two of the boot LEDs. This combination indicates a checksum error I think.So, it should have worked and I'm not sure why it hasn't. I'm not sure why the original flash and ram no longer work. I would say it's not reading the disc properly, but I have tried a 2nd disc and still no good**SOLVED**The disks I had were old and no good. Tried again with a fresh download and new disks and it worked. Firmware now installed.
HP 8904A Firmware EPROM image 08904-87010 - Page 1
Forum section: electronics / testgear

author: octillion
author_rank: Contributor
timestamp: March 07, 2020, 05:33:43 am
content: I'm looking for an HP 8904A firmware image from A2U12 with label 08904-87010. I currently have firmware 08904-87007 (the EPROM is AM27256), and have issues with HP-IB stalling after a number of commands are sent. As per HP's service manual page 7-2, this is a known issue that is resolved by upgrading to 08904-87010. An image of the newest firmware (08904-87011) is available online, however this is incompatible with hardware having a serial number prefix below 2948A.There is also an EPROM in A2U13 labeled 08904-87008, but this part does not need upgrading (per page 7-9). I can post binary dumps of both if anyone is interested.

author: DeepLink
author_rank: Regular Contributor
timestamp: March 09, 2020, 08:40:30 pm
content: Same problem hereI also need 08904-87010Mine is a series 2822A with 08904-87007

author: Atlas85
author_rank: Newbie
timestamp: January 14, 2022, 12:26:05 pm
content: Hi there,I have the HP 8904A at hand, unfortunately the power supply is no longer there with mine. I read out the EEPROMS and added them to the ZIP as *.BIN and *.HEX. The HP number and reference is 08904-87007 REV27887A.Good luck, and if anyone still has a power supply, they can offer it to me.Best regards
Israeli prices of test equipment - Page 1
Forum section: electronics / testgear

author: PartialDischarge
author_rank: Super Contributor
timestamp: January 14, 2022, 07:38:08 am
content: I know Israel is an expensive country, with higher average salaries than other countries, specially in tech.So I'm wondering, due to interest from my job, how are test equipment prices there compared to the EU or the US, also higher?
Tenma power supply: using the serial port - Page 1
Forum section: electronics / testgear

author: Mike1
author_rank: Newbie
timestamp: April 12, 2017, 08:20:31 am
content: I have recently bought a Tenma 72-2635 triple-output power supply from Element14. It works correctly when I use the front-panel knobs, but I cannot get any response to commands that I send into the RS232 port. The instructions are very sketchy, and I don't know whether there is an actual fault in the supply, or whether I am doing something wrong in sending the commands. For example, the manual claims that sending "OUT1" (without the quotes) should turn ON the output. I start up Microsoft's Hyper Terminal (Windows XP), set the baud, stop bits etc as specified, then type OUT1, and nothing happens. If I unplug my serial cable from the power supply and terminate it withy a loop-back plug (pin2 connected to pin 3 on a DB9 plug), then OUT1 is reflected to the screen, as it should be -- so the command is atleast getting to the power supply. In case my typing is too slow, I tried putting OUT1 in a .txt file, then sending the file. I was able to send that by selecting Kermit protocol and "send as text file". But the power supply ignored it.I have also tried replacing Hyper Terminal with the MTTTY communicartions programme, without success.Am I doing something wrong, or is it the supply?

author: halexa
author_rank: Regular Contributor
timestamp: April 12, 2017, 08:50:17 am
content: Hi I have a 1 port Tenma power supply that i got working over serial with Python.Don't know if the protocol is same but could be worth a tryCode:ser = serial.Serial('COMxx') #depending on used serial portser.write(b'VSET1:12.00') # set voltage to 12Vser.close()

author: Mike1
author_rank: Newbie
timestamp: April 13, 2017, 11:22:48 am
content: Thanks, Halexa. I prefer not to use python if I can help it, but I will keep your comments in mind. The 'VSET1:12.00' is the same protocol as mine.

author: cowana
author_rank: Frequent Contributor
timestamp: April 13, 2017, 11:33:22 am
content: Have you tried sending a carriage return and line feed (CRLF) after the command?

author: Andreas
author_rank: Super Contributor
timestamp: April 13, 2017, 01:51:44 pm
content: Quote from: Mike1 on April 12, 2017, 08:20:31 amYour typing speed is too slow so you run into a time out.I copy the commands with "CTRL-C" and "CTRL-V" from a text file into the terminal program.(using a KORAD KA3005P which is a unbranded version of the TENMA)with best regardsAndreas

author: Mike1
author_rank: Newbie
timestamp: January 14, 2022, 12:18:30 am
content: Thank you all for your help, and my apologies for this late response. I eventually sat down, learnt some Python and bought a USB to RS232 dongle. Initially nothing worked, then I found that inserting a 0.1 second pause ( time.sleep(0.1) ) between commands solved the problem. Now it works well.
Build another OWON HDS200 PC Software from scratch - Page 1
Forum section: electronics / testgear

author: BetterAndBetter
author_rank: Contributor
timestamp: December 14, 2021, 11:52:06 am
content: Hi guys，I want to try to implement a PC Software for HDS200, the idea is that get picture directly from the HDS200, send the key value to control HDS200 when click one of the buttons.Are there any other functions that need to be implemented?

author: BetterAndBetter
author_rank: Contributor
timestamp: December 17, 2021, 01:12:03 am
content: I have two ideas：Set diy color to HDS200；Support simulation and real;

author: BetterAndBetter
author_rank: Contributor
timestamp: December 21, 2021, 09:51:07 am
content: This is the program that displays the UI of waveform generator.Simulator:https://sim.lvgl.io/v8.1/micropython/ports/javascript/index.html?script_startup=https://raw.githubusercontent.com/lvgl/lvgl/a3b22128adb9754a775ddf3aca2bf562f9543739/examples/header.py&script=https://raw.githubusercontent.com/hunt-bao/hds200_pc/main/waveform_generator_ui.pywaveform_generator_ui.py:https://github.com/hunt-bao/hds200_pc/blob/main/waveform_generator_ui.pyYou can see wg_ui_buf variable from source code, the wg_ui_buf that received from HDS200. One byte from wg_ui_buf represents index of two pixels color.Feel free to modify the code and click the Restart button.Check out this link for more technical documentation:https://docs.lvgl.io/master/examples.html#get-started

author: simba15
author_rank: Regular Contributor
timestamp: December 21, 2021, 01:53:30 pm
content: This is a great Idea.Especially as the latest model is 100Mhz!If this was implemented well it could make the HDS2XX As useful as a USB oscilloscope.

author: BetterAndBetter
author_rank: Contributor
timestamp: December 22, 2021, 01:18:38 am
content: 100Mhz model of HDS200 is further enrich the product series.It would be lots of work to do As a useful USB oscilloscope. As the starting point, Each type of instrument has different application scenarios, and I hope that this software can implement the features that users care about more. while users can participate in discussion, design, and even programming.

author: eti
author_rank: Super Contributor
timestamp: January 14, 2022, 02:32:49 am
content: Quote from: BetterAndBetter on December 21, 2021, 09:51:07 amTo what end, this script? Is this a simulation of the function generator, or does it interact with the *actual* function generator circuit inside the scope, allowing the user to interact with it?A thorough, extremely detailed explanation would be good. Thanks
Siglent SDS1104x-e sample rate during pulse testing - Page 1
Forum section: electronics / testgear

author: cncjerry
author_rank: Unknown
timestamp: January 13, 2022, 08:52:06 am
content: I put Leo's pulser on my brand spankin new SDS1104x-e with the upgrade to a SDS1204x-e. Looking at the pulse in the upper right with one channel on, I see 1.00GSa/S as expected.I then hooked up the trigger output of the pulser and fed it into CH2 thinking I would see if the scope did better or worse with a 2nd channel triggering it. Both channels dropped to 500MSa/S.I then wrote some complaints in this space before thinking of trying CH3. So CH1 and CH2 share one ADC and CH3 and CH4 share the other. It makes sense.I'm seeing 1.79ns rise time triggering on the pulse and 1.80 when triggering on CH3, that which has the pulser trigger output. I suspect the 1.79 vs 1.80 are essentially equal. My 11801c measures the pulse as 28ps though it should be closer to 40ps. I'd be curious to hear if others see much different than the ~1.80ns risetime from Leo's pulser on this scope.ThanksJerry

author: 2N3055
author_rank: Super Contributor
timestamp: January 13, 2022, 09:58:26 am
content: 1.7-1.8 ns sound about right and is consistent with a performance of an average 200 MHz scope...

author: blurpy
author_rank: Regular Contributor
timestamp: January 13, 2022, 05:45:15 pm
content: This is from an original SDS1204X-E:
Fluke 289 service manual - Page 1
Forum section: electronics / testgear

author: tgwena
author_rank: Newbie
timestamp: April 24, 2016, 05:53:38 am
content: I was watching the eevblog Fluke 289 video (number 15 part 2). He say that he obtained the service manual for the 289. Is there anywhere where I can obtain it? A pdf preferred, but paper will do if it is reasonable.

author: tgwena
author_rank: Newbie
timestamp: April 24, 2016, 01:22:41 pm
content: Hi Robert. You pointed to the USER manual. I am looking for the SERVICE manual.

author: G0WZB
author_rank: Regular Contributor
timestamp: April 24, 2016, 04:21:01 pm
content: Calibration manual is just below the user manual if thats any help.

author: okw
author_rank: Frequent Contributor
timestamp: January 13, 2022, 02:31:23 am
content: Any luck getting the service manual for 287 or 289?

author: coromonadalix
author_rank: Super Contributor
timestamp: January 13, 2022, 02:48:38 am
content: There is none available for the 287 289 that i know ofIf he did It must be under an non disclosure agreement, if not i think it would have been shared, ask dave in a personal email ??

author: mqsaharan
author_rank: Regular Contributor
timestamp: January 13, 2022, 05:24:40 am
content: I did see a link for pdf of service manual for Fluke 189 II here on the EEVblog forum. I don't remember at the moment in which thread. If you search for it, I'm sure you'll find it. Fluke renamed 189 II to 287.

author: coromonadalix
author_rank: Super Contributor
timestamp: January 13, 2022, 11:43:43 am
content: oh yesss i remebmber it, it was on an chineese forum i even liked some threadslike this linkhttps://www.eevblog.com/forum/repair/fluke-187189-repair/Check post #4 and #9 for 2x downloadable pdfon salehttps://www.ebay.com/itm/Fluke-189II-AN-Multimeter-Service-Manual-User-Manual-Combo-/133647090721

author: okw
author_rank: Frequent Contributor
timestamp: January 13, 2022, 12:10:24 pm
content: Oh, that's good. Thanks.Would there be any differences between the two? I know for example 77 and 177 are identical. 77 IV PCB even say 17x.Mine is 287, so 187 could be identical?

author: BeBuLamar
author_rank: Super Contributor
timestamp: January 13, 2022, 02:20:53 pm
content: I have both the 189 and 289 and they are vastly different. I don't think they can share the same service manual.

author: coromonadalix
author_rank: Super Contributor
timestamp: January 13, 2022, 03:19:11 pm
content: they are not the same187 and 189 are 50000 countsthe 87 IV and 89 IV are mostly the same as 187 189, but it seems they had (87IV and 89IV) a bug in the 5v auto range, slugginess ??287 289 are 60000 count sorry confused the threadthe 187 II and 189 II are mostly the same as 287 289If i recall ''cough'' the 189 II is a 289 .... with an higher pcb and FW revision(s), same for the other models
Rohde Schwarz DVSG Digital Video Signal Generator other uses - Page 1
Forum section: electronics / testgear

author: hcglitte
author_rank: Regular Contributor
timestamp: January 13, 2022, 09:38:29 am
content: Hi,Got hold of a Rohde Schwarz DSVG 2113.0008.02.I have no use for it, as I do not work with video etc.Wondering if it could be used for other things?If anyone knows about more "normal" lab use for this equipment, please let me know!
JUNTEK JDS6600 Signal generator - Page 1
Forum section: electronics / testgear

author: Silvio
author_rank: Newbie
timestamp: January 12, 2022, 09:06:59 pm
content: Hi All, I have a problem with my signal generator (jds6600 60Mhz). I accidentally shorted the output of channel 2 which now is giving off a DC signal. I followed the signal path before the output relay and ended up with the 2 ICs under the small heatsink Unfortunately the markings on these IC are erased. I also checked the other channel but these are also erased. Can anyone that has a similar generator tell me the number of these two ICs so that I can change them. I am quite positive that these must have failed during the short circuit at the output.
Looking for an inexpensive portable oscilloscope recommendation - Page 1
Forum section: electronics / testgear

author: PartyLikeAVulcan
author_rank: Newbie
timestamp: January 10, 2022, 05:28:35 am
content: Newbie here… looking for a portable scope for basic vehicle diagnostic use. Things like checking crank position sensors, ignition pickup coils, etc. I see a number of inexpensive options available like Owon and Hantek offerings. Any recommendations?

author: Fungus
author_rank: Super Contributor
timestamp: January 10, 2022, 06:28:50 am
content: Get something designed for the job, complete with automotive cables and connectors, etc.http://www.micsig.com/html/31.html

author: PartyLikeAVulcan
author_rank: Newbie
timestamp: January 10, 2022, 08:39:05 pm
content: Looks cool but given I don't do this for a living was hoping for something "adequate" in the 200.00 to 300.00 (US) range...

author: Fungus
author_rank: Super Contributor
timestamp: January 11, 2022, 02:19:13 pm
content: There's this:https://www.eevblog.com/forum/testgear/owon-hds-200-handheld-oscilloscope-w-builtin-dmmawg/It's nowhere near as good, but it might do the job. Try asking the owners in that thread what they think.

author: PartyLikeAVulcan
author_rank: Newbie
timestamp: January 12, 2022, 11:32:44 pm
content: That's what I ended up ordering after I saw the owon thread. Even with its flaws I should suffice for my purposes.
HP Agilent 856xx SA Marker Signal Generation - Page 1
Forum section: electronics / testgear

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: January 11, 2022, 12:02:47 am
content: Anyone know where the marker display signals are generated in these spectrum analyzers? My guess is that they are digitally generated on the controller board.

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: January 12, 2022, 04:15:35 pm
content: ...and the correct answer is:Yes! Marker display is generated on the Controller Board A2. If you are having Marker display issues (tail on marker), bring up the CRT adjustment screen. It should look exactly as the manual shows. Mine had the Digital X lines in a pretty big X, they are supposed to be parallel. The DGTL X GAIN pot was misadjusted AND intermittent. Cleaned, and adjusted again, problem resolved.