hybridfree/eevblog-posts huggingface dataset:
Rigol DP2031 web password? - Page 1
Forum section: electronics / testgear

author: Per Westermark
author_rank: Contributor
timestamp: September 21, 2024, 02:48:47 pm
content: Anyone know what the password is to access the web pages on the Rigol DP2031 power supply?The manual claims user: admin and password rigol. Doesn't work.Some other documentation claims password is RIGOL - uppercase. Doesn't work.I seem some other Rigol power supply claims password 2012. Doesn't work.I have a support ticket to Rigol about another issue - and that one has been zero-answer for over a week...More interesting. My instrument has the web pages.The most recent manual from August this year have removed the text about any web interface. So no way to check if any password correction has been incorporated.

author: Tjuurko
author_rank: Regular Contributor
timestamp: September 21, 2024, 04:09:47 pm
content: In "Quick Guide Dec.2022" there is no longer any mention of a password.In "Quick Guide Apr.2022" it says: When youfirst login to the Web Control, the user name is "admin" and password is "rigol".

author: Per Westermark
author_rank: Contributor
timestamp: September 21, 2024, 11:31:20 pm
content: Yes I know the text mentions "first log in".You can visit the web pages without needing any password at all - no need to login.But some of the links on the page does require you to login. And that's where 'rigol' or 'RIGOL' or '2012' doesn't work. That's the different password I have seen in some mixed Rigol power supply manuals.I have uploaded a screenshot showing the places where a login is needed.

author: xjordanx
author_rank: Contributor
timestamp: September 25, 2024, 10:50:29 pm
content: I hate to say it but...ME TOO!Only in my case it's the DL2031. There are no mentions of web admin passwords anywhere, and I believe this is the only way I can change the device's network hostname by accessing the Network Settings page.Don't have this problem with the scopes...Did you ever hear back from Rigol about this?

author: Bryn
author_rank: Regular Contributor
timestamp: September 26, 2024, 05:55:21 am
content: I would assume that you contacted Rigol regarding password recovery.Or, should it be the last resort, a factory reset would be the trick, which would reset the password to any of the three that you tried.

author: thm_w
author_rank: Super Contributor
timestamp: September 28, 2024, 12:27:58 am
content: It was posted here:https://www.eevblog.com/forum/testgear/rigol-dp900-dp2000-series-hack/msg4942744/#msg4942744Username is left blankPassword is "Rigol1998"
FLUKE 289 all measurements are wrong - Page 1
Forum section: electronics / testgear

author: czullo
author_rank: Newbie
timestamp: December 13, 2023, 01:59:00 pm
content: No matter what mode of measurement I choose, be it voltage or current, resistance or even temperature, all measurements are heavily skewed and unstable. Has anyone had a similar problem with this meter and knows how to fix it? I am the second owner so warranty repair is not likely to be an option.

author: armandine2
author_rank: Frequent Contributor
timestamp: December 13, 2023, 03:10:24 pm
content: deleted post - not relevant

author: J-R
author_rank: Super Contributor
timestamp: December 13, 2023, 11:26:08 pm
content: The two photos posted so far don't appear to show a problem in my opinion. Mine does the same thing in VAC mode if I'm near it with no leads connected. Do you have more examples of the issue but with test probes connected to something?

author: BeBuLamar
author_rank: Super Contributor
timestamp: December 13, 2023, 11:44:14 pm
content: If you don't have the probes connected or connected and not shorted together or connect to a voltage source then the display is normal. Also if you live in the USA you can still have the 289 repair under warranty even if you're the second owner. Fluke doesn't ask for proof of purchase when you send it in for service.

author: Kim Christensen
author_rank: Super Contributor
timestamp: December 13, 2023, 11:50:35 pm
content: Quote from: czullo on December 13, 2023, 01:59:00 pmGetting a reading on AC volts like that isn't too surprising.What does it read when measuring current with no leads attached?

author: tonycstech
author_rank: Regular Contributor
timestamp: September 28, 2024, 04:27:35 am
content: My 289 has an issue with resistance.I am reading 1.2K circuit (semi conductors BGA chips and micro processors) with any chinese meter i get 1.2K.Fluke gives me some 200-300 ohms.It does read other circuits normally.I noticed that it uses different voltages for different range of resistance measurements but they say the same thing.

author: parawizard
author_rank: Regular Contributor
timestamp: September 28, 2024, 07:54:16 am
content: Quote from: tonycstech on September 28, 2024, 04:27:35 amAre you saying you are measuring in circuit? Probably you are turning on something in the circuit which gives you a different result than other meters?
Rohde & Schwarz FSH3 unsuccessfull fairmware uppgrade - Page 1
Forum section: electronics / testgear

author: hafrse
author_rank: Regular Contributor
timestamp: August 13, 2019, 12:26:54 pm
content: Hello,Tried to uppgrade the fairmware of my FSH3 to version 1.40 through the optical cable but the uppgrade program crashed after 37% and now the instrument is dead, only beep one when I press the power on , no display, no communication is possible anymore. NAy clues what can be done?Thanks

author: Gian2975
author_rank: Contributor
timestamp: August 14, 2019, 08:42:27 am
content: Hi,please contact Mirko Badiali (Rf Shop).Best regardGianfranco

author: Ksi
author_rank: Newbie
timestamp: September 27, 2024, 04:31:28 pm
content: Hej!Jag har samma problem med min Fsh3, försökte köra in V,14 men efter uppdateringen är skärmen svart. Hur löste du de?Mvh ksi
Rigol DP811 remote sensing - Page 1
Forum section: electronics / testgear

author: terrance
author_rank: Contributor
timestamp: September 27, 2024, 05:36:45 am
content: I got my DP811 calibrated, and the voltage output and measurement is within spec now.but, when I toggle "sense", voltage output (externally measured) jumps between 2 values, is 1.8% lower when "sense off", but internal readings are the same. There's 0 load, and sense+ sense- is short to output +/- at the terminal.- set: 1.000 V, meas 0.982 V- set: 10.000 V, meas 9.819 V- set 40V. meas 39.284V

author: terrance
author_rank: Contributor
timestamp: September 27, 2024, 06:43:44 am
content: this drives me nuts, I did a "sense off" calibration, and now, it is 1.8% lower when "sense on" than "sense off"And the "ADC cal" (page 2) fails, and "sense cal" has only 1 calibration point.I'll try a "sense" calibration in script.
Looking for documentation on Zentro ELA electronic load around 2008 - Page 1
Forum section: electronics / testgear

author: Wollvieh
author_rank: Contributor
timestamp: September 26, 2024, 08:20:13 pm
content: I have an electronic Load from Zentro, year 2008, type ELA 1500/75/100. Seems that despite its young age there is no documentation out there. It has GPIB and RS-232-Interface, so it would be nice have an overview of how to control it.

author: Martin72
author_rank: Super Contributor
timestamp: September 26, 2024, 08:29:01 pm
content: Have you already contacted them directly?They are supposed to be very service-friendly.https://www.zentro-elektronik.de/kontakt/
Iwatsu SC-7205 Universal Counter - Page 1
Forum section: electronics / testgear

author: Thomas
author_rank: Regular Contributor
timestamp: September 22, 2024, 03:49:20 pm
content: Just got this counter from eBay. It seems to have the one thing I'm missing on my Racal Dana 1992: Statistics.So I thought this could be a replacement for the 1992. I was wrong. For the same gate time, the 1992 provides 2 extra digits of precision. That's not gonna work.Anyway: Does anyone have any documentation on this thing?User/programming/service manual?I have searched the internet and found very little, just some specs and a datasheet.I have sent an email to Iwatsu Europe and asked, but I don't expect an answer from them.

author: Thomas
author_rank: Regular Contributor
timestamp: September 26, 2024, 05:55:17 pm
content: Iwatsu Europe answered my email and sent me Operating and Service manualsDidn't really expect that, nice.In the meantime I have found some Visual Basic ver.6 example code using wayback machine:https://web.archive.org/web/20060101021233/http://www.iti.iwatsu.co.jp/download/index.htmlGot RS-232 communication up and running with the help from that.Manuals:https://drive.google.com/file/d/148efMXNAAjdB4YqXybHc8BlwW6d9qC9b/view?usp=sharinghttps://drive.google.com/file/d/12_YmLaSxrFt8j6Vo2lhqsvIVqDbBKiAB/view?usp=sharing
Brymen 869s with BU86X does not connect under Win11 - Page 1
Forum section: electronics / testgear

author: Harm314
author_rank: Newbie
timestamp: September 26, 2024, 06:32:06 pm
content: Hi, I have a Brymen 869s + BU86x (bought together in jan-2017), that work reliably under Win 10 on two different computers (an aging self-built desktop built around an i7-2600K, and an ancient Acer Aspire 1810tz).However, on twodifferentWin11 laptops this combination will not run (with a one-time exception, below).The main (test) Win11 laptop is a HP Elitebook G7- i5 with Win11 Pro. As alternative I tried my wife's Surface Pro 7.The datacable shows up with VID 0820 and PID 0001 in Device Manager, and identifies under devices --> other devices as 'Superior DMM'.Note: I see two device IDs:USB\VID_0820&PID_0001&REV_8603USB\VID_0820&PID_0001In the Brymen Bs86x software (downloaded from the site, version 6.0.0.3s) I get error  USB Data Cable not found.I have also tried Test Controller. It seems to find the cable but fails to communicate with it (Test Controller works on a Win10 computer with this hardware). From the debug mode:;; HIDv0820p0001-81727: Found usb device: \\?\hid#vid_0820&pid_0001#6&27b953b7&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030};; HIDv0820p0001-81727: Comm failed;; HIDv0820p0001-81727: RxHID:;; Stopping thread for: HIDv0820p0001-81727 - Brymen BM869sOther things I tried:- run as admin (I normally run in a user account)- set compatibility mode (to Win7)- switch off 'Allow the computer to switch off this device to save power'One-time exception: Earlier tonight the Brymen software was able to connectone timein the Brymen Bs86x software. After I took out and reconnected the USB plug I was no longer able to connect, also not after a restart.I've already gotten feedback on a Dutch forum that this combination works for other people under Win11.I'm not much of a Windows troubleshooter, and out of options. Help very much appreciated.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 26, 2024, 06:39:46 pm
content: some talk therehttps://www.eevblog.com/forum/testgear/logging-data-using-brymen-bm867s-with-sigrok-on-windows-10-(bu-86x-usb-cable)/

author: Harm314
author_rank: Newbie
timestamp: September 26, 2024, 07:41:12 pm
content: Thanks for the link.The plot thickens: With Sigrok (version 0.7.2) it works (both with and without admin rights).Any thoughts?

author: KungFuJosh
author_rank: Super Contributor
timestamp: September 26, 2024, 08:14:18 pm
content: Sounds like bad drivers. Try uninstalling from device manager, then reinsert to reinstall.

author: Harm314
author_rank: Newbie
timestamp: September 26, 2024, 08:24:42 pm
content: The drivers are the standard Windows drivers for HID devices. Screenshot attached, but I don't have high hopes this will solve the issue, especially since a second Win11 PC has the same issue.I'll try anyway over the weekend.
(Old) Hioki 7010 DC Signal Source - Any information? Schematics? - Page 1
Forum section: electronics / testgear

author: kblue
author_rank: Regular Contributor
timestamp: June 20, 2024, 12:23:03 pm
content: Hello there!Found this "little" thing and its a bit "off-spec". For example 5.000 V Output is reported as 5.012 +/- V. Tested with different Meters. So far no luck with any useful information. However, i was able to find some pictures with similar looking units with up to 10 VDC output (my one stops at 8.000 V for V-DC and 80.00 mA-DC) at japanese auction sites. Mayhaps someone here has more informations available? It does look like a rather nicely made unit and it would be nice to check some simple metersBest wishes from germany!

author: Overspeed
author_rank: Frequent Contributor
timestamp: June 20, 2024, 01:03:04 pm
content: HelloFirst step is to recap the PCB , all electrolytic Caps shall be changed for fresh one's and PCB inspected for corrosionRegardsOS

author: kblue
author_rank: Regular Contributor
timestamp: September 25, 2024, 10:16:01 pm
content: Hello again!No luck after changing the caps. Most of them also measured completely fine. Guess without schematics or something similar, this will be on hold for a long time. (possible eternity)Best wishes!

author: coromonadalix
author_rank: Super Contributor
timestamp: September 26, 2024, 01:17:13 am
content: best would be to measure each trimpot center wiper to each side, note them and on a function try to fiddle with it ?you need to decipher on witch function the circuitry worktry to find data on some of the ic's, some must be switches ...upd7514 is the mcuad7541 is an 12 bit DAC ??lm301 = op amplf411cn = JFET-input op ampSN74HC540 = Octal Buffers and Line Drivers With 3-StateNJU7301D = Analog Switch ICs CMOS Quad SPST that would be the ones ??M5218 = Dual Low Noise OpAmpfound that japaneese documentation onhttps://www.hioki.co.jpand english athttps://www.hioki.com/download/30540

author: mawyatt
author_rank: Super Contributor
timestamp: September 26, 2024, 01:57:18 am
content: If all else fails and you decide to risk a pot adjustment to bring the output level in-line, VR2 seems a likely candidate to tweak the output level. Say this because it's a 10 turn pot and would expect any kind of fine tuning the output would rely on a 10 turn pot, and it's near the DAC which would seems logical.As mentioned above carefully take note of the pot position, so you can return to that position if this doesn't have the proper effect.Hopefully you'll get a schematic from someone and be able to better understand the circuits and what the various adjustments represent. Of course you could attempt to trace out the circuits and create your own schematic, that would be what we would attempt before "blindly" attempted any adjustments, but this likely will entail a lot of time and effort.Anyway, just a guess at what to adjust if you decide to try.Good luck!!Best,
sst49lf160c - Page 1
Forum section: electronics / testgear

author: sagias
author_rank: Newbie
timestamp: September 24, 2024, 06:27:09 am
content: Hello guys i want to programm an sst49lf160but my tl866ii plus dont support the ic,i want to know if i can find a suitable programmer i googlebut nothing foundthanks

author: stj
author_rank: Super Contributor
timestamp: September 24, 2024, 09:21:07 am
content: firstly i think you got the part number wrong or it was changed,i can only find references to 49lf016cT48 supports it.but if it's a parallel flash then you may be able to program it as a 49lf080 in 2 banks by manually manipulating the highest address line.

author: ftg
author_rank: Frequent Contributor
timestamp: September 24, 2024, 11:48:51 am
content: The -f160 Flash chips seems to be a weird in-between model that was not often used.So older and newer chips with different cases and pinouts are often supported, but f160's not.
Alternative for Siglent SDS814X HD - Page 1
Forum section: electronics / testgear

author: eTobey
author_rank: Super Contributor
timestamp: September 24, 2024, 09:05:47 pm
content: I am wondering, if there is a comparable scope (or two that have these features together, if they are in the same price range combined - used).I dont really need the FFT, Bode and Mask test. The 12 and the zoom function bit is not really a must have, but it should function properly.One should be a 4 CH scope (color display). And it would be really nice to have a way to sync them both somehow.

author: tautech
author_rank: Super Contributor
timestamp: September 24, 2024, 09:14:03 pm
content: Budget ?

author: eTobey
author_rank: Super Contributor
timestamp: September 24, 2024, 09:18:49 pm
content: If it (those) has some nice/better features, let it be 800, if not, then less.
Tek TAS 465: How to fine-tune Volts/Div  - Page 1
Forum section: electronics / testgear

author: allenwp
author_rank: Contributor
timestamp: September 13, 2024, 06:57:31 pm
content: Hi there,I have aTektronix TAS 465. I can easily adjust the Volts/Div at a coarse scale, such as 1 V, 500 mV, 200 mV, 100 mV, 50 mV, etc. How do I have more fine control of the Volts/Div? I noticed there is a "VAR On/Off" setting in the Vertical Menu, but turning that on doesn't change the behaviour of the Volts/Div dial.I've tried searching through the manual that I've linked, but I can't seem to find instruction on how to set the Volts/Div to something like 735 mV, for example.Is anyone here familiar with this line of oscilloscopes or is able to find instructions on how to do this?Thanks!

author: tautech
author_rank: Super Contributor
timestamp: September 13, 2024, 09:42:01 pm
content: Quote from: allenwp on September 13, 2024, 06:57:31 pmIt won't.The fine Var will however change the amplitude of the waveform.A DSO OTOH will display the V/div when in Fine mode and measurement cursors can provide accurate values....within the limits of what a scope can resolve.

author: allenwp
author_rank: Contributor
timestamp: September 27, 2024, 04:55:29 pm
content: Alright, I finally figured it out!When in the vertical or horizontal menu, there is the option to turn VAR on or off. When this is turned onandwhen the option to turn it on or off isselected, you can use the main smooth dial at the top of the scope (the one that has a line beside it that leads to the "TOGGLE" button) to fine-adjust the Volts/Div!The thing that really tripped me up is that you need to be in the menu with the VAR On/Off setting selected for this top dial to actually adjust the Volts/Div. The moment you have anything else selected in the menu, you can no longer fine-adjust the Volts/Div.
Aligent 34401A LCD characters Shorted - Page 1
Forum section: electronics / testgear

author: simba15
author_rank: Regular Contributor
timestamp: September 23, 2024, 03:19:14 pm
content: Hi there All,I feel this is the only place I may find a reasonable answer for my issue.I have 1 (Out of 50) 34401a that will not display the units correctlyThe display seems like characters 10/11 are shorted. Lets say for voltage should be mVDC but it will show VVDC with small m shown under the V. If I use freq mode then it reads HHZ not HZ.Any ideas what i could do to resolve this? I don't want to buy just the lcd and have it be the same. I could do a display card swap.

author: Kleinstein
author_rank: Super Contributor
timestamp: September 23, 2024, 03:34:07 pm
content: The display is VFD, not LCD. This looks like an odd problem at the display PCB. If lucky this would be something like a solder ball or tin wisker (hard to see) causing the short at the display driver or near the display itself. Some cleaning with a brush could help.The error will move with the display PCB, so little need to move it to another unit.AFAIK there are newer and old display PCBs that are not interchangible.There are service manuals available, that may show which pins are the suspects ( digit select for digit 10 and 11).

author: coromonadalix
author_rank: Super Contributor
timestamp: September 23, 2024, 04:00:16 pm
content: 50x 34401a ?? wowit depends on the serial numbers, old one ... have the non available vfd driver ic .... unless you put a cloned vfd, you wont be sure if it is the ic of the vfd itselfand more recent, have other vfd driver chip that can be found or subbed, and too this cloned vfd can be found ... prices have gone upyou must be very careful if you remove the lcd and put a new one, legs can be much longer and may kick on the front panel and you may damage it while sliding it into placeand yes check all voltages going on the vfd / front pcband one more advise, you can not switch old vfd driver board into the more recent one, and the other way, the display firmware is not the sameif i recall < 7 display fw is the old vfd ic and >7 is the newer ... others members may chime inyou have to find Keysight notes about the SN ...

author: simba15
author_rank: Regular Contributor
timestamp: September 23, 2024, 05:40:45 pm
content: Quote from: Kleinstein on September 23, 2024, 03:34:07 pmWow you were bang on!!! A quick brush and it is working perfect now!Thanks! I will be sure to keep this in the notes for the future.Yes we have about 50 34401a and 50x 33210a for student use. Keeping them working for another 20 years will be interesting. ( I wouldn't dare replace them with 34461a).

author: coromonadalix
author_rank: Super Contributor
timestamp: September 23, 2024, 06:06:00 pm
content: good advice Klein ill keep this one, ok i've slightly gone too farthe 34410a and 34411a are very good replacement too for the venerable 34401a, schematics exist too, after theses ones ... nothing
Please help for strange problem with Fluke 867B DC measurement - Page 1
Forum section: electronics / testgear

author: marcaurell
author_rank: Newbie
timestamp: July 02, 2020, 06:38:50 pm
content: on my Fluke 867B, which otherwise works perfectly, DC shows a level of approx. 14v in the view window. Does anyone have a solution for this ?? See Photos. Thank you very much!

author: shakalnokturn
author_rank: Super Contributor
timestamp: July 02, 2020, 08:57:04 pm
content: Main display is handled by RIC (1727P) the graphing/scope comes through RIC too but the ADC is done separately by U10 (MP87L75).My first suspects would be U14 (74HC4053) and U9 (MC34081D) check concerned power supplies first of course.

author: CDaniel
author_rank: Frequent Contributor
timestamp: July 02, 2020, 10:48:16 pm
content: For processing the waveform ( scope mode ) there is a DC bias to shift the input of the fast ADC U10 to half range ( so it can go up and down with the alternating signal ) , maybe this is wrong . First you should check if with the probes shorted or not connected , VIN pin16 is at VREF/2 . The reference is 1,2V if i'm correct , so at 0,6V .U10 is the 8bit fast ADC used only for scope , the precision ADC for meter is inside U30 RIC2 and both go in separate way to the display processor .

author: Analogdevice
author_rank: Contributor
timestamp: November 06, 2020, 06:17:04 pm
content: Hi there,I'm repairing this device for marcaurell.I don't have so much time this weekend, so very quickly:Measured between TP29 (non-inverting input of U9 before R31) and signal ground, DCV, auto-range.Shorted input: 1,18VOpen input: 1,18V300mVDC to input: 1,19VIt should be 1V at shorted or open input and 1,3V at 300mVDC at input.It comes from RIC2, because this voltage is present also if I remove R31 or U14 and U9.I checked Z6 (feedback resistors at COMP. AMP and feedback resistor at summary amp) - OK.Can someone measure for me input to the comparation amplifier? Pin 1 of Z6 between signal ground (COM input)? I'm very suspicious that there will be problem, because comp. amp is working and it comes from RIC2 (it's a pity that I don't know what and where drives the switches inside RIC2).Thank you very much!Greetings from Slovakia.

author: Analogdevice
author_rank: Contributor
timestamp: November 13, 2020, 08:16:15 am
content: Hello,nobody have 867? Please, take off 6 screws and some other 6, apply 300mVDC (e.g. from calibrator or power supply) and measure for me pin 1 of Z6 between COM input.It will help me so much! Thank you!

author: coromonadalix
author_rank: Super Contributor
timestamp: September 24, 2024, 04:31:32 pm
content: be patient and don't push the forum ...
About HP8903A. Other version of output attenuator A6 board. - Page 1
Forum section: electronics / testgear

author: Blanc
author_rank: Newbie
timestamp: September 23, 2024, 12:22:54 pm
content: I need someone's help to resolve my long-standing frustration.A few years ago I acquired a used HP8903A.Completely restored except for output the attenuator board A6. Because my HP8903A has a different version of the A6 board. Looking at the service manual, the A6 board has two large relays. However, my A6 board has three large relays.If anyone has a service manual for the 3-relay version A6, please provide the A6 circuit diagram and troubleshooting steps page in PDF or other format.My HP8903A is working very well up to 60mV rms output. However, if the value is lower than that, the output amplitude will be 10 times the specified value. For example, if you specify 6mV rms, the output will be 60mV rms. So if you want to get 1mV rms, specify 0.1mV rms. It's not that serious, but it's annoying.The service manual I have has detailed instructions on how to repair the A6 board. Unfortunately, this explanation doesn't work for my other version of the A6 board.
Years manufactured ? Kikusui COS6100M - Page 1
Forum section: electronics / testgear

author: ClifS
author_rank: Newbie
timestamp: September 12, 2024, 02:21:52 pm
content: Does anyone know when the Kikusui COS6100, A and M were produced.Thanks

author: coromonadalix
author_rank: Super Contributor
timestamp: September 12, 2024, 04:47:44 pm
content: some manuals show 1998 so it should be around this year but precisely .... haven't found anything yet

author: ps
author_rank: Regular Contributor
timestamp: September 15, 2024, 01:50:31 pm
content: Quote from: ClifS on September 12, 2024, 02:21:52 pmI bought mine in 1992 as surplus from the US Army. It was sold by Rosenkranz Elektronik in Germany, this company is still in business. The US Air Force Field Service Manual is dated April 1, 1985.

author: ClifS
author_rank: Newbie
timestamp: September 22, 2024, 08:28:14 pm
content: Thanks guys. I was figuring mid 80s.

author: Bryn
author_rank: Regular Contributor
timestamp: September 23, 2024, 05:13:35 am
content: They were actually produced in the late 1970s... don't know what year exactly but that's what I found following a bit of research I did.
VIMU MSO41 4 channel 12 bit osciloscope - Page 1
Forum section: electronics / testgear

author: radeko
author_rank: Newbie
timestamp: September 23, 2024, 02:22:10 am
content: This osciloscipe has better parameters than picoscope 4425A . It has 50MS/s in streaming mode. picoscope 4425A has only 20MS/s in streaming modehttp://en.vimu.top/index.php?m=home&c=View&a=index&aid=55https://pl.aliexpress.com/item/1005007698044288.html
VIMU oscilloscopes -please remove this topic. ( i made it twice) - Page 1
Forum section: electronics / testgear

author: radeko
author_rank: Newbie
timestamp: September 23, 2024, 02:17:53 am
content: VIMU MSO41 4 channel 12 bit osciloscopehttp://en.vimu.top/index.php?m=home&c=View&a=index&aid=55https://pl.aliexpress.com/item/1005007698044288.html
You'd expect keysight to know a think or 2 about displaying voltage, seems not - Page 1
Forum section: electronics / testgear

author: Psi
author_rank: Super Contributor
timestamp: September 22, 2024, 11:23:21 pm
content: You'd expect KeySight to know a think or two about displaying voltage, seems not.Their official PATHWAVE software is showing me this from the 34461A Meter

author: floobydust
author_rank: Super Contributor
timestamp: September 23, 2024, 12:28:48 am
content: I've never used the Pathwave S/W but for full effect try report the bug to KeySight. The demoralizing website that assumes you are in error and needing support and can you pay for that with your account?I like how it became extra digits, like 9? The 4Hz sample rate does not agree with the displayed trace steps.And the ground symbol? It's part of their stock ticker lol.
Hioki 7020 - looking for service manual - Page 1
Forum section: electronics / testgear

author: DavidKo
author_rank: Frequent Contributor
timestamp: October 25, 2021, 08:50:47 pm
content: Hello,I'm searching for service manual for Hioki 7020. Hioki official statement is that it is long time unsupported device. Some frequencies are out of the range. There is lot of trimpots and test points inside, but the marking does not give a hint.At least I have dumped the FW 1.20 if someone can have a use for it

author: DavidKo
author_rank: Frequent Contributor
timestamp: November 17, 2021, 11:05:27 pm
content: To my surprise the device uses universal transformer. After some measurements I have changed the "jumper" to from 100V to 240V one (one cable is not necessary, but I do not waste him, so I have only doubled the connection that is already there).I have also replaced the input filter before doing this. I have bad experience with X2 caps in old devices

author: DavidKo
author_rank: Frequent Contributor
timestamp: November 17, 2021, 11:17:54 pm
content: Some picturesThe picture of the first board is missing. During the first repair I have dumped the FW, but I forgot to make a picture. It cannot be removed without removing the front panel.

author: DavidKo
author_rank: Frequent Contributor
timestamp: November 18, 2021, 10:14:16 am
content: It looks that service manual is unobtainium. I have tried to ask for it, but the reply is that they will not calibrate it and it is unsupported device.At least the user manual is still available online on their sitehttps://www.hioki.com/download/29153

author: alex-kv
author_rank: Contributor
timestamp: September 22, 2024, 02:10:34 pm
content: The low current output stage had failed on my 7021, so I reverse-engineered to better understand what I was doing during repair.Here is the partial schematic of the motherboard

author: alex-kv
author_rank: Contributor
timestamp: September 22, 2024, 02:15:48 pm
content: Also, my 7021 needed readjustment, so I made again a bit of reverse-engineering of the REF/DAC board. The schematic is not complete, the whole part around the AC-to-RMS AD536A and the Voltage-to-Frequency Converter AD654 is absent.

author: alex-kv
author_rank: Contributor
timestamp: September 22, 2024, 02:25:59 pm
content: ... and now the main analog board part, still partial. The digital part and most of the stuff around the relays and the power resistors is missing.I have made some notes next to resistors leads, which was THT radial mounted: C means "short lead" and L means long lead. There is also some notes B and H for Bottom and Top respectively.The Excel file shows what can be adjusted by turning most of the pots.

author: alex-kv
author_rank: Contributor
timestamp: September 22, 2024, 02:27:45 pm
content: And to finish, here is the EPROM V1.20 of the 7021 (7020 without the AC option)
First scope for vehicle  - Page 1
Forum section: electronics / testgear

author: Alessss
author_rank: Newbie
timestamp: September 20, 2024, 09:42:48 pm
content: Hello everybody,I'm an automotive technician and I'm looking for my first oscilloscope to measure can and ethernet lines.The transmission speed varies between 100 MBit/s ethernet and 100 - 500 kBit/s for can.I have seen the Fnirsi 2C23T but I do not know if it can do its job properly, alternatively a Rigol DS105AZ but please recommend other manufacturers and models.I am an apprentice and I do not know how to use an oscilloscope well but I am still looking for a reliable product with which I can experiment at home.I have no preference whether in the form of a multimeter, "desktop" or usb, I would like it to cost a maximum of $ 400Thanks in advance

author: BillyO
author_rank: Super Contributor
timestamp: September 21, 2024, 11:54:10 pm
content: To do a decent job of monitoring and looking for problems on 100Mbit Ethernet you would need at least a 200MHz scope, The FNIRSI won't be effective for Ethernet.What is it you will be looking for? There are better tools for looking at Ethernet than an oscilloscope. Some scopes have the ability to decode CAN signals, as well as looking at the waveforms. In both Ethernet and CAN you can have "healthy looking" signals in the cable but at the same time not have any kind of viable communication.

author: ADT123
author_rank: Regular Contributor
timestamp: September 22, 2024, 04:45:55 am
content: As BillyO says 100MBit ethernet / BroadRReach is going to push you to a faster / more expensive scope and not many scopes can decode it (other than the higher end PicoScope oscilloscopes it is a paid for option which will cost more than your budget for a scope). Given this protocol is only used on a few vehicles for a few systems (ADAS and in somecases video infotainment) you might want to consider compromising here and focus for your first automotive scope on choosing a scope that can capture and decode the majority of automotive signals (CAN, LIN, FlexRay, CAN FD etc) as well of course all the other sensors / actuators (ABS, injectors etc).Dont forget that as well as the scope you will probably need current clamps, ignition pickups (unless EV only) and HV diff probes etc.As I work for Pico I am of course going to recommendhttps://www.picoauto.com/products/automotive-oscilloscope-kit/overviewas the right tool for the job but this will take you over budget
AWA Low Distortion Oscillator G232 - Teardown - Page 1
Forum section: electronics / testgear

author: sean0118
author_rank: Frequent Contributor
timestamp: September 22, 2024, 07:56:15 am
content: Just some teardown photosedit: Pretty sure this is the main oscillator? or at least part of it? It's potted so can't see much:Frequency counter:Level control:Oscillator:Power amp:Output attenuator:Power supply:Front panel connections:

author: Kleinstein
author_rank: Super Contributor
timestamp: September 22, 2024, 04:09:29 pm
content: The big gray box may be a kind auf audio transformer for the output. At least it looks like it is connected near the power amplifier output.The actual oscillator is very likely a Wien bridge of similar RC oscillators with pairs of capacitors near the switches for the rages. So likely the osciallator with the discrete transistors near the capacitors.It is quite some time since I saw a 4 digit frequency counter. I would have expect the frequency to be a bit more stable, at least for a short time.

author: trobbins
author_rank: Frequent Contributor
timestamp: September 22, 2024, 08:10:08 pm
content: The oscillator is a two RC phase-shift type around two stages, with one of the stage gains controlled via an LDR-LED, and was all BC550.I have the previous G231 oscillator from 16 years earlier (1970), which does use a Wien bridge format. I am about to get that on the bench again to see what distortion benefit can be gained from better matching of the bridge parts (even though AWA matched their capacitors pretty well).The G232 has significantly lower harmonic distortion specs than the G231, and at the time AWA relied on their vintage F240 noise and distortion meter to confirm those specs. The F240 (which uses an active twin-T notch filter) can't really measure down to such a low distortion level, so they had to use an additional custom passive twin-T notch filter jig to confirm spec.

author: Gyro
author_rank: Super Contributor
timestamp: September 22, 2024, 09:21:37 pm
content: The manual, including schematics is readily available on the web. Just search AWA G232.
Instructions / wiring diagram for "Xiao Ni" Oscilloscope Clock Controller Board? - Page 1
Forum section: electronics / testgear

author: pdenisowski
author_rank: Super Contributor
timestamp: September 21, 2024, 10:27:43 pm
content: I recently came into possession of a Chinese-made semi-clone of the Dutchtronix oscilloscope clock board, but there were no instructions / wiring diagram with it. Does anyone happen to have these?As you can see from the picture, I did get it working and was able to access the menus (which seem pretty self-explanatory), just curious as to what the other pins do, etc. I've also looked at all the Dutchtronix docs, but it's very different hardware.You can find them on AliExpress, etc. as "Oscilloscope Clock Controller Board LED Display for 8SJ31J/7SJ32J/5SJ38J/3SJ1J Oscilloscope Tube" I did some pretty extensive searching but nothing came up.Thanks!

author: KungFuJosh
author_rank: Super Contributor
timestamp: September 21, 2024, 10:34:16 pm
content: Looks like the other header is for a tube:https://www.aliexpress.com/i/3256805387984307.html
Recommedation need : Siglent SSA3075X-R or Siglent SVA1075X or Rigol  RSA5065N - Page 1
Forum section: electronics / testgear

author: wma
author_rank: Newbie
timestamp: September 21, 2024, 05:32:04 pm
content: Which product is more stable and have good functionality (especially VNA part)- Siglent SSA3075X-R- Siglent SVA1075X- Rigol RSA5065NThanks

author: tautech
author_rank: Super Contributor
timestamp: September 21, 2024, 07:28:16 pm
content: Quote from: wma on September 21, 2024, 05:32:04 pmWelcome to the forum.3075X-R are 1075X have similar HW except for the RTA module.They work to spec and just fine as a single port VNA.Can you share your requirements for maybe a better recommendation ?

author: tv84
author_rank: Super Contributor
timestamp: September 21, 2024, 07:37:10 pm
content: Quote from: wma on September 21, 2024, 05:32:04 pmNo brainer.
OWON XDM2041 55,000 count bench DMM - Page 1
Forum section: electronics / testgear

author: BillyO
author_rank: Super Contributor
timestamp: September 20, 2024, 11:51:23 pm
content: Hi all,I have a personal acquaintance that is asking about this meter. It's currently available for ~$170 (USD) and he has little desire/ability spend more. Foolish me, I said I can probably find out whether it is any good and give him a report back. There is really nothing here I can find about it and there are few very skimpy video about it on YT that seem to have a positive outlook on it. Looking at the specs and form factor it seems like a good choice for the price if it actually does what it says.I don't mind other suggestions for similar items under $200, but I'm really looking for first hand experience on this DMM.Can anyone help?

author: coromonadalix
author_rank: Super Contributor
timestamp: September 21, 2024, 12:25:32 am
content: seehttps://www.eevblog.com/forum/testgear/owon-xdm1041-the-unknown-multimeter/msg4276255/#msg4276255based on handheld dmm chiphave some quircks toohttp://essentialscrap.com/owon_fix/https://hackaday.com/2021/07/14/fixing-noisy-measurements-on-an-owon-xdm2041-bench-multimeter/fw could or has glitchesand your "personal acquaintance" needs are ?i would go on a good handheld insteadmy 2 cents

author: Muttley Snickers
author_rank: Unknown
timestamp: September 21, 2024, 02:53:00 am
content: I picked up a rebadged Owon XDM2041 a few months ago during an Element 14 Clearance Sale for $175 AUD or around $120 US.I haven't done much with it since but am certainly satisfied with its appearance as it definitely looks the part, looks count too you know.

author: BillyO
author_rank: Super Contributor
timestamp: September 21, 2024, 04:20:46 pm
content: Quote from: coromonadalix on September 21, 2024, 12:25:32 amHe already has a decent hobbyist handheld - a Kaiweets HT118E. He got the idea for this from seeing my SDM3055. He asked why I'd have a bench DMM and I told him, so now he wants a bench DMM too. His needs are just a general hobbyist level. He's not very experienced but wants to do more.Those problems seem to be associated with aliasing against the 50Hz. Not that it would disappear completely but it would be a bit less evident @ 60Hz. Plus, I don't think he'll need to measure resistors exceeding 10MΩ very often.Anway, there are things about it that are significantly different than the XDM1041 - form factor, front accessible 10A fuse, 4-wire resistance measurement, full auto-ranging. For the additional $25, it seems to me to be worth it. However, there are lots of videos about the XDM1041 on YT and it seems to be well liked.

author: BillyO
author_rank: Super Contributor
timestamp: September 21, 2024, 04:21:40 pm
content: Quote from: Muttley Snickers on September 21, 2024, 02:53:00 amLet us know what you think of it when you get a little time with it.
RIGOL DG800-ARB8M Memory Depth Upgrade Option - Page 1
Forum section: electronics / testgear

author: steve420
author_rank: Newbie
timestamp: September 20, 2024, 06:21:29 pm
content: Hey, does anyone know if theRIGOL DG822 is hackable for the upgradable mem depth option?

author: thm_w
author_rank: Super Contributor
timestamp: September 20, 2024, 11:11:52 pm
content: Yes, can search and find threads here:https://www.eevblog.com/forum/testgear/new-rigol-16-bit-function-generators-dg800900-series/msg5589301/#msg5589301

author: steve420
author_rank: Newbie
timestamp: September 21, 2024, 10:13:29 am
content: Ive done all the steps but im missing the rigol ultrasigma software? its nowhere to be found?
HP 6205B Power Supply - Page 1
Forum section: electronics / testgear

author: sneily
author_rank: Contributor
timestamp: September 13, 2024, 06:13:07 pm
content: Has anyone replaced the indicator lamp within the power-on/off pushbutton on this particular HP Power Supply? (the 6205B)It appears to me that the entire switch assembly would need to be removed IF the lamp is replaceable. (it's not an easy removal)If you have attempted this lamp replacement, please let me know.Thanks(the picture is not of my unit, but mine is the same model with the same on/off pushbutton. (It was just easier to grab a pic off the internet)

author: sneily
author_rank: Contributor
timestamp: September 13, 2024, 06:42:19 pm
content: I managed to get the pushbutton out of the faceplate. See pics. Indeed the pushbutton shows a printed schematic of a lamp.But there are no visible clues that the lamp is replaceable.

author: factory
author_rank: Super Contributor
timestamp: September 13, 2024, 07:20:20 pm
content: Your too impatient, the button pulls out of the switch, no need to remove the entire switch.See pictures attached, it contains an A1H flanged neon lamp, exactly the same as printed on your switch.David

author: sneily
author_rank: Contributor
timestamp: September 16, 2024, 01:36:33 pm
content: Brilliant! Thanks!I did try removing the plastic button/cover but was too afraid of breaking it since I did not know if it separated or not.I will get more aggressive and try again and report back when I have achieved victory.I appreciate your photos and education on this

author: sneily
author_rank: Contributor
timestamp: September 16, 2024, 02:31:42 pm
content: It took a strong squeeze and tug to separate the plastic cap.I have ordered the replacement bulb.By the way, for anyone interested, Electro Switch still makes this switch. Although by a different part number.Thanks again to this forum and to factory David for the knowledge sharing and advice.Cheers!

author: sneily
author_rank: Contributor
timestamp: September 16, 2024, 03:40:04 pm
content: For the benefit of anyone wanting to replace this illuminated pushbutton switch, I have attached an image of the Electro Switch Corporation product and it's relevant data sheets.Cheers!

author: sneily
author_rank: Contributor
timestamp: September 20, 2024, 08:43:31 pm
content: Illumination has been restored.Yes, it's a small thing,,,,, but I like keeping my tools well maintained.
Tektronix 2712 Spectrum Analyser nvram data lost - Page 1
Forum section: electronics / testgear

author: jemoa
author_rank: Newbie
timestamp: September 24, 2024, 03:38:54 pm
content: Hi,I recently changed the back up battery to the gpib board and stupidly replaced battery on the display storage board. I have now lost the nvram data.I need to do a flatness test which requires software which is unobtainable. Does anybody have access to this software. Many Thanks

author: tautech
author_rank: Super Contributor
timestamp: September 24, 2024, 03:49:01 pm
content: Welcome to the forum.Have you had a look around in the Tekwiki ?https://w140.com/tekwiki/wiki/2712
Rigol DP811 USB dead? - Page 1
Forum section: electronics / testgear

author: terrance
author_rank: Contributor
timestamp: September 16, 2024, 08:21:38 am
content: Insert any UFD, USB2, USB3, SD Card reader... nothing works. Tested the connector, has 5V supply, D+ D- appears ok, with 20k resistance to V-.Insert UFD when powered up, no D: appears.Removed LAN cable, still not working.Am I doing something wrong? Or is there a known working UFD list, or what?

author: terrance
author_rank: Contributor
timestamp: September 16, 2024, 03:04:22 pm
content: My USB2 UFD has an LED, It does not blink at all, so the DP doesn't even try to enumerate it?

author: _Wim_
author_rank: Super Contributor
timestamp: September 16, 2024, 07:35:35 pm
content: Did you use FAT32 formatting? What memory size where they? I believe (not sure) they should be <8GB.

author: terrance
author_rank: Contributor
timestamp: September 20, 2024, 09:12:59 am
content: absolutely, usb 2, fat32, 4GB, and my DM3068 can use it....

author: _Wim_
author_rank: Super Contributor
timestamp: September 20, 2024, 05:54:18 pm
content: Quote from: terrance on September 20, 2024, 09:12:59 amThat does indeed sound like the USB port has issues in that case. Do you see any traffic on D+ and D- when you plug a stick into the port?
Anyone faced ADC/Initialization Errors with a Sorensen power supply? - Page 1
Forum section: electronics / testgear

author: LoveLaika
author_rank: Frequent Contributor
timestamp: September 02, 2022, 10:05:49 pm
content: I was asked to have a look at a Sorensen DHP programmable power supply. It's for high voltage, and we use it for lab experiments. However, recently, it fails to work. When you turn it on, it says something about the ADC not calibrated or something. From what I can tell, it gets stuck at this point, so it doesn't finish some initialization sequence. It's the first time we've experienced this; generally, when we turn it on, it works normally. Anyone faced anything like this before?

author: jmurray
author_rank: Regular Contributor
timestamp: September 18, 2024, 02:53:30 am
content: Quote from: LoveLaika on September 02, 2022, 10:05:49 pmCurious if you got anywhere with this?This sounds like an NVRAM failure. The DHP uses a Dallas DS1230Y NVRAM for configuration data and calibration constants. We have one at work that recently stopped working and are kicking ourselves for not backing up the NVRAM IC sooner.Contemplating sourcing a parts unit to try and reverse-engineer the NVRAM but it might be a (very expensive) shot in the dark.

author: LoveLaika
author_rank: Frequent Contributor
timestamp: September 19, 2024, 10:07:36 pm
content: Sorry to disappoint. We just bought a new power supply to replace it rather than spend a really long time troubleshooting the issue. I wish I could say more about it, but it just wasn't worth the time to spend hours to try and look for the cause, especially since this is way out of my depth.
Fluke 196C Battery charger BC190/808 - Page 1
Forum section: electronics / testgear

author: vmendes
author_rank: Newbie
timestamp: September 19, 2024, 05:36:22 pm
content: Hello guys,Today I measure the voltage of charger (21.2Vcc), with load and without load. But the nominal voltage for this charger is 17.8Vcc.The scopemeter 196C works fine with this voltage, but that’s aren’t correct.Could I use another charger like a notebook charger ? With same voltage 17.8vcc.Regard
FNIRSI oscilloscope 2C53P - Page 1
Forum section: electronics / testgear

author: Deltatango
author_rank: Newbie
timestamp: September 19, 2024, 05:06:21 pm
content: Bought one of those 2C53P combo test equipment's from their web store on AliExpress is there an issue with its Y input over a probe set on x10 showing a frequency restricted 1 KHz square wave.Probes are fine on other machines just wondered if I had not been able to work it correctly yetDavid