hybridfree/eevblog-posts huggingface dataset:
Free service manual & user manual, schematics etc. - Page 1
Forum section: electronics / testgear

author: ciasteczkowypotwor
author_rank: Contributor
timestamp: September 22, 2013, 01:10:46 pm
content: Hello,Publish a set of service manuals for free. All available materials were acquired free of charge. If anyone has an objection to a document, please report it and it will be removed.Home page:http://bee.mif.pg.gda.pl/Oktoda/index.php/Strona_g%C5%82%C3%B3wnaLINK DELETEDFTP:http://bee.mif.pg.gda.pl/ciasteczkowypotwor/

author: amyk
author_rank: Super Contributor
timestamp: September 22, 2013, 02:18:46 pm
content: Not everyone here speaks Czech...I find no trace of service manuals on that 2nd site, is it hidden or something...?

author: SeanB
author_rank: Super Contributor
timestamp: September 22, 2013, 02:20:47 pm
content: FTP works well........

author: Stonent
author_rank: Super Contributor
timestamp: September 22, 2013, 02:22:09 pm
content: Looks like Polish to me.

author: Fsck
author_rank: Super Contributor
timestamp: September 22, 2013, 02:35:52 pm
content: Quote from: SeanB on September 22, 2013, 02:20:47 pmit definitely does.

author: BravoV
author_rank: Super Contributor
timestamp: September 22, 2013, 03:07:15 pm
content: Quote from: amyk on September 22, 2013, 02:18:46 pmIt Polish, not Czech.Quote from: amyk on September 22, 2013, 02:18:46 pmSomething you mean like this that I found ? Not bad at all.... and a lot others.

author: ciasteczkowypotwor
author_rank: Contributor
timestamp: September 22, 2013, 08:22:44 pm
content: Link deletedYes, i'm from Poland.

author: perdrix
author_rank: Frequent Contributor
timestamp: December 07, 2023, 10:26:48 am
content: Yes, I know this is "necro-posting".If anyone downloaded the Bee archive as a torrent, then I'd been grateful if you'd start seeding it again (I just lost a RAID array).ThanksDavod

author: ZigmundRat
author_rank: Regular Contributor
timestamp: December 07, 2023, 02:34:46 pm
content: FTP link still works. wget should suck it down with no issues.
The RTB2000 scope lacks a 50-ohm input - Page 1
Forum section: electronics / testgear

author: Sariel
author_rank: Regular Contributor
timestamp: December 07, 2023, 07:34:06 am
content: Hey everyone,I've been really impressed with the RTB2000 series of scopes, but I couldn't help but notice the absence of a 50-ohm input—they only have 1 Megohm inputs.My workaround idea is to use a T-splitter with one arm connected to a 50-ohm termination.Has anyone tried this method, and are there any drawbacks or disadvantages I should be aware of?This way, we could still make the most of this scope even when measuring devices that require a 50-ohm load.Thanks!

author: pope
author_rank: Frequent Contributor
timestamp: December 07, 2023, 09:13:52 am
content: I believe this is what is done on all scopes that don't have 50-Ohm inputs.Also, here's a very nice videohttps://www.youtube.com/watch?app=desktop&v=4GyCAe34N0k

author: pdenisowski
author_rank: Super Contributor
timestamp: December 07, 2023, 01:22:23 pm
content: I just use a 50 ohm feedthrough with the RTB. They are relatively inexpensive and work fine.
Acquisition mode "average" showing different waveform on the second channel. - Page 1
Forum section: electronics / testgear

author: Aldo22
author_rank: Super Contributor
timestamp: December 06, 2023, 10:26:45 am
content: I noticed something strange with my new Hantek yesterday.The situation is this: I have 2 active channels and the second channel has a slightly higher frequency than the first (+0.1Hz), like if you want to create a slowly rotating Lissajous figure.The trigger is on Ch1 (yellow).All good, in "normal" acquire mode.But if I switch to "average" and set the "average count" a little higher to e.g. 32, then the moving square becomes a trapezoid on screen.However, as soon as I press "Stop" or want to take a screenshot, it becomes a square again.That's why there are photos in the attachment and not screenshots.Is this normal or a Hantek "specialty"?Thank you!

author: 2N3055
author_rank: Super Contributor
timestamp: December 06, 2023, 11:44:42 am
content: In short it is artefact of how Averaging acquisition work.Something similar would happen on all scopes with Average acquisition.It is sometimes useful, but very limited mode, that needs to be applied in specific way to work well.Try reading in manual on how Average works... If Hantek manual does not explain it use any manual from Keysight, Tek, Siglent, R&S ... They all work similarlyIf you still have problem understanding come back here and we'll try to explain it in more detail..

author: Aldo22
author_rank: Super Contributor
timestamp: December 06, 2023, 01:13:29 pm
content: The Hantek manual does not go much into depth:Quote from: Hantek User Manual DSO2000But it is described quite wellhere:QuoteThank you!

author: 2N3055
author_rank: Super Contributor
timestamp: December 06, 2023, 02:23:06 pm
content: Quote from: Aldo22 on December 06, 2023, 01:13:29 pmYou are welcome.As you know now, second channel was not correlated with triggered channel. So "sampling point" was moving on 2nd channel on different places with time and it was averaged like that.Play with a frequency a bit, you can get all kinds of funny shapes...

author: Aldo22
author_rank: Super Contributor
timestamp: December 06, 2023, 03:36:30 pm
content: Quote from: 2N3055 on December 06, 2023, 02:23:06 pmYes!The other thing to note here is that the Hantek DSO2000 never shows an "average" screen when you press "Stop" or take a screenshot.I haven't checked the other modes, but with "average" it always seems to save a "normal" screen.So if you turn on "average" to get a smooth waveform on a screenshot, you're out of luck.It does however save the "ghost lines" in "persist" mode.Thank you!
SDS 1204x HD on Aliexpress...legit? - Page 1
Forum section: electronics / testgear

author: roy_eedreku
author_rank: Contributor
timestamp: December 06, 2023, 11:21:30 am
content: Seems like SDS1202X HD and 1204X HD have popped up on Aliexpress -https://www.aliexpress.com/i/3256805212875769.html?gatewayAdapt=4itemAdaptThe images do show the correct model number but they are white as opposed to black mentioned in the post on SDS1000X HD release. Price also seems higher than predicted but that's all they were, predictions.Does anyone have information if these would be legit or not? I'm leaning towards a "no".

author: tautech
author_rank: Super Contributor
timestamp: December 06, 2023, 11:34:45 am
content: Quote from: roy_eedreku on December 06, 2023, 11:21:30 amEarly China model 1 GSa/s ADC.Western models will be 2 GSa/s.

author: 2N3055
author_rank: Super Contributor
timestamp: December 06, 2023, 11:53:42 am
content: Quote from: roy_eedreku on December 06, 2023, 11:21:30 amIt is literally irrelevant.These scopes are expensive enough that it is not really smart to buy them without support and multi year warranty...

author: pope
author_rank: Frequent Contributor
timestamp: December 06, 2023, 12:01:04 pm
content: White is so much prettier....

author: Antonio90
author_rank: Frequent Contributor
timestamp: December 06, 2023, 12:48:08 pm
content: That product was posted already in another thread. It is grossly overpriced, as is the old version with only two channels.It won't have any warranty on top of that.Unless you have money to burn, don't buy it.

author: coromonadalix
author_rank: Super Contributor
timestamp: December 06, 2023, 01:00:48 pm
content: Aliexpress is no longer a good place to buythey say they give you good deals with impressive rebates percentage numbers lolll cyber monday niet, black friday niet, the deals where not good at allbut when you check the real product sources, or the maker prices, you pay a lot more than neededand yes warranty ......... i would not take chances on any electronic equipment over 60$ usd

author: KungFuJosh
author_rank: Super Contributor
timestamp: December 06, 2023, 03:09:21 pm
content: Quote from: coromonadalix on December 06, 2023, 01:00:48 pmI got a couple great deals on there. aliexpress is a marketplace, you have to find the right people to buy from. Cloudray had some great laser supply sales in the past month. I personally wouldn't get any serious TE on there for the warranty reason, but I got a couple small things like voltage refs and a TC3 on there. All good. You can't blame ebay either for sellers price gouging.
Fluke A3001FC strange battery drain problem. - Page 1
Forum section: electronics / testgear

author: BeBuLamar
author_rank: Super Contributor
timestamp: December 10, 2023, 05:01:34 pm
content: The Fluke representative gave me this simple AC current clamp meter with Fluke Connect. It works OK but I found it drains the 2 AA batteries when not in use. So today I checked the current draw and found initially when I just connect the power it only draws 0.3 µA so it's no problem there. Turning it on it draws from 7 to 15 mA. OK that's fine. Turning it off with its power button the unit went off but now it draw 300µA which is significant. And it continued to draw the 300µA until I disconnect the power source and reconnect it then it draw 0.3µA again.So basically I would have to remove the battery and reinstall the battery whenever I am done using it.Anyone has any idea what is the problem?

author: bdunham7
author_rank: Super Contributor
timestamp: December 10, 2023, 05:41:13 pm
content: Is it capable of being turned back on via the remote app? How long does it take to drain the batteries? If they are AA, I'd expect that to take a few thousand hours?

author: BeBuLamar
author_rank: Super Contributor
timestamp: December 10, 2023, 06:38:19 pm
content: I don't use it much and noticed that the battery drained after a few weeks. No it can't be turned on via the remote app. I know what you meant if it drain 0.3 mA it would take a year to drain them.

author: floobydust
author_rank: Super Contributor
timestamp: December 10, 2023, 07:06:10 pm
content: I had a device behave like this and it was a firmware bug. The MCU and peripherals did not properly go to sleep- under certain shutdown sequences.You might try a few things and see what makes it shutdown properly, if that is possible or if Bluetooth activity is part of it staying at a higher drain etc. Or it might draw higher current just for a few minutes after shutdown.Sometimes a programmer is a bit sloppy with the 'go to sleep' path and forgets to turn something off.In my case, the manufacturer issued a recall because it caused batteries to go dead and then leak. I had to laugh, the replacement product changed over to a hard on/off switchinstead of fixing the firmware bug.
Rigol MSO7034 vs MSO5354 price - Page 1
Forum section: electronics / testgear

author: Morazan
author_rank: Newbie
timestamp: December 05, 2023, 07:59:15 pm
content: I'm trying to buy an oscilloscope and narrowed it down to the MSO7034 and MSO5354. The 5354 is $1,999 USD and the 7034 is $5,099. Both are the 350MHz BW version. I don't know why the price difference is so large. The 7034 has a bigger screen and a few more features but I can't believe that alone makes it more that 2x the price of the 5354. Most of the specs between the two are identical. I don't care about a bigger screen since I'm going to connect external monitor anyways. So I can't justify spending so much on the 7034. Heck, I can buy two 5354 and still have money left over for more equipment.Does anyone know why the 7034 is so much expensive? I'm just asking out of curiosity.Thanks!

author: Martin72
author_rank: Super Contributor
timestamp: December 05, 2023, 08:43:22 pm
content: A few things are already different.More memory, more sample rate, higher DC-gain accuracy, higher timebase accuracy, larger screen, 50 ohm inputs, connection for active probe...Whether this is worth 3000$ more, I cannot judge.But how did you come up with this older scope series from rigol?If it doesn't have to be MSO, but has to stay rigol, I would rather get a DHO4204 and hack it to 800Mhz.
ROHDE SCHWARZ - SFU - Page 1
Forum section: electronics / testgear

author: OliverWirthg
author_rank: Contributor
timestamp: December 07, 2023, 07:21:48 am
content: I bought an older SFU unit from ebay, which I managed to get working. But it has two bugs that I would like to fix.1. After unplugging it at boot time, it prints: CMOS checksum error - Defaults loaded. Is the DC battery on the mainboard faulty? Or something else? Where is the battery? I have cleaned the unit, but the battery is nowhere to be found.2. A rubber button just below the screen is not working. Is it possible to buy a new set of buttons or an old front panel somewhere? I have had no success on eBay!Is there any *pdf service documentation for this unit? If so, I would be grateful if you could send it to me by post: oliverwirthg@aol.comThank you very much!

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: December 07, 2023, 01:31:23 pm
content: The CMOS battery on these R&S units is on the FMR Module. It's right behind the front panel/screen.

author: OliverWirthg
author_rank: Contributor
timestamp: December 08, 2023, 06:46:02 am
content: Thank you so much for your help! I found the battery in the place you posted. Standard CR2032, I replaced it immediately. If anyone knows of a rubber keypad for RS SFU, let me know!
Looking for ROM image of Fluke 8860A control board - Page 1
Forum section: electronics / testgear

author: LazyJack
author_rank: Frequent Contributor
timestamp: November 19, 2023, 06:41:19 pm
content: Hi,I'm working on a Fluek 8860A benchtop multimeter and based on the tests, it very much looks like a case of bit-rot in the control board (A3 board) ROM (U9). I have not been able to locate a ROM image at the usual places, so if anyone has or willing to make a dump of this ROM, it would be a great help.

author: LazyJack
author_rank: Frequent Contributor
timestamp: December 04, 2023, 05:13:14 pm
content: To answer my own question. After further examination it turned out that the port expander was faulty (it handles memory chip select also) and the ROM is ok. So attached is the ROM image in Intel hex format.
Measuring capacitance using UNIT UT139C - Page 1
Forum section: electronics / testgear

author: winkot
author_rank: Newbie
timestamp: December 04, 2023, 10:34:35 am
content: When measuring capacitance up to 300 pF, the UNIT UT139C shows 0. In the range from 300 pF to 6800 pF, the device shows values, but with an error of 30-10%. And only after 0.01 µF does it show the correct values. Why is this happening ? This is normal?

author: Caliaxy
author_rank: Frequent Contributor
timestamp: December 04, 2023, 01:13:06 pm
content: Low capacity measurements are challenging on most multimeters... Are you measuring in relative mode?

author: winkot
author_rank: Newbie
timestamp: December 04, 2023, 01:35:06 pm
content: No, I don't use relative mode because the multimeter shows 0.
Mastech HY3005D-3 Power Supply - Page 1
Forum section: electronics / testgear

author: Randy222
author_rank: Frequent Contributor
timestamp: December 03, 2023, 11:02:37 pm
content: I have one, Mastech HY3005D-3 Power Supply, from many years ago.Never really tested the noise of the thing.But it's kinda big & clunky. Dual outs with a fixed 5v too. The output selection is good for my needs, I often run low level control ckt's along with higher power stuff, and sometimes do need the fixed 5v too.That said, I am looking for a replacement in effort to downsize the footprint on my bench. And yes, I prefer simple dial wheels for adjusting. Any suggestions for $250(US) budget?

author: electr_peter
author_rank: Unknown
timestamp: December 04, 2023, 10:29:15 pm
content: You can get two new Korad KA3005P or new/used (depending on deals) Siglent SPD3303C for that budget.
count rising edges between cursers - Page 1
Forum section: electronics / testgear

author: snarkysparky
author_rank: Frequent Contributor
timestamp: December 03, 2023, 04:18:25 pm
content: Would love to be able to dial my cursors to position and count rising edges between them.I really need that capability in my oscope. Using a sig 1104xe. Now i export the waveform and open in octave and run a script i wrote.Does any scope in low cost range do it?thanks

author: csuhi17
author_rank: Frequent Contributor
timestamp: December 03, 2023, 04:57:01 pm
content: Rigol DHO900 and maybe the 800 also contain several types of counters.you can find it in the description.you can set two sources, one is zoom and the other is main.I did not find an option for counting between two indicators.I made a small video, in the process I managed to find a bug.DHO900 series.]

author: alm
author_rank: Super Contributor
timestamp: December 03, 2023, 08:13:59 pm
content: My most modern scope is about 20 years old, so I can't comment on which entry level scope you should look at, but what you're looking for is a scope that can gate a measurement between two cursors, and then a measurement like count number of edge transitions (just divide by two and add uncertainty of +/- 1 for just the rising edges). My 20 year old mid-range Lecroy scope can do it as part of thejitter & timing analysis option, and I think Siglent has taken a fair number of features from Lecroy, so it wouldn't surprise me if some modern Siglent scopes supported it, but I'm sure others will chime in for that.

author: 2N3055
author_rank: Super Contributor
timestamp: December 04, 2023, 12:14:30 am
content: SDS1000X-E has measurement gates. But no edge or pulse count measurements.Scopes SDS2000X+ and up have both...

author: TurboTom
author_rank: Super Contributor
timestamp: December 04, 2023, 12:15:35 am
content: Rigol's DHO1k can easily do that and I'm pretty sure the DHO800 / 900 models as well since they untilize the same basic software package. Even the venerable DS1000Z was / is capable of this, though IIRC, the pulse / slope counting function had been added with some firmware update as the instrument matured. Whatsoever, now it's there.

author: csuhi17
author_rank: Frequent Contributor
timestamp: December 04, 2023, 04:50:37 am
content: Quote from: TurboTom on December 04, 2023, 12:15:35 amHow were you able to set the DHO1k to count between the two CA-CB indicators? I can't find it in the description, and I couldn't set it on the DHO924 either, I can only select main and zoom as Region.

author: TurboTom
author_rank: Super Contributor
timestamp: December 04, 2023, 11:06:41 am
content: Oh that comes unexpected! Another detail where the venerable DS1000Z performs better than the DHO800 / 900. The DHO1k offers three choices for measurement region: Main, Zoom or Cursor, see screenshot.

author: ebastler
author_rank: Super Contributor
timestamp: December 04, 2023, 12:39:01 pm
content: Quote from: csuhi17 on December 04, 2023, 04:50:37 amDefining a measurement region via the cursors was added to the DHO1000 and 4000 family with firmware 02.07, released in April, according to the release notes.
Agilent DSO7014A power switch - Page 1
Forum section: electronics / testgear

author: artag
author_rank: Super Contributor
timestamp: December 03, 2023, 04:05:06 pm
content: I'm starting to have a problem with the power switch on my Agilent DSO7014A scope.It appears to not stay latched on, but actually what's happening is that clicking it from the on state to the off state doesn't always quite complete and it sticks in a state where the power is off but the toggle hasn't completely cycled, so turning it on doesn't latch. Usually several attempts at pushing the button in and then releasing it so that it clicks out FAST will fix it for a while.I shall strip it down soon and see if I can grease it back to life, but has anyone else encountered this on a 7000 series or, probably it's close 5000 and 6000 relatives ? If it it needs a new switch, are they a commonly available item ? I know HPAK have recently killed the excellent parts availability which helped build their reputation and desirability.
General Resistance DAS 45 CC, Manual Please - Page 1
Forum section: electronics / testgear

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: December 01, 2023, 12:41:46 pm
content: I have looked in the usual places but have not found a service manual for this specific General Resistance instrument. The company is now Prime technology.The DAS 45 has more adjust points than the instruments for which I can find schematics. It has three ranges 10 V, 1V and 100 mV.The schematics for lots of other similar units are available, but I cannot find this specific model.Thanks in advance Wally

author: Vgkid
author_rank: Super Contributor
timestamp: December 01, 2023, 04:23:52 pm
content: Try emailing prime technology. They were helpful in the past.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: December 04, 2023, 11:58:01 pm
content: I did email Prime but no response so far, so does anyone have any info?
P5104 40kV 20MHz oscilloscope probe - Page 1
Forum section: electronics / testgear

author: Plow
author_rank: Newbie
timestamp: December 02, 2023, 03:18:15 pm
content: I'm curious about the P5104 HV/HF oscilloscope probeshttps://www.alibaba.com/product-detail/20MHz-P5104-1000X-40KV-High-Voltage_1313156951.htmlIt looks like the only HV/HF probe that's even moderately affordable.I've never used anything but standard passive probes that come with cheap oscilloscopes. Is there anything to know about using probes like that above? is it as simple as set to 1000x and plug and play? Will it function on any 1000x scope? I have a Rigol DS1102E, probably will upgrade to the DHO804.

author: PartialDischarge
author_rank: Super Contributor
timestamp: December 02, 2023, 03:23:20 pm
content: The only caveat with these probes is that the pulse compensation is important and not something that will be plug and play, it has to be adjusted for each scope. This said mostly everyone uses this probes for 50Hz not for pulses so few ppl care.

author: bdunham7
author_rank: Super Contributor
timestamp: December 02, 2023, 03:27:12 pm
content: It looks plausible, but the compensation box has "20kV 100MHz" printed on it, so who knows what you're getting. It also lists an input impedance of 1000M and 0.5-1.5pF, implying there is just a 999M resistor with the scope in series. That's not a plausible, IMO. So I doubt anyone will know exactly what you are getting until someone opens up a package and does some testing.

author: tggzzz
author_rank: Super Contributor
timestamp: December 02, 2023, 04:28:10 pm
content: Quote from: bdunham7 on December 02, 2023, 03:27:12 pmIf that's the case and you set the scope to AC (cf DC), then the entire 20kV would be across the scope's input capacitor. Oops.The other point is to beverycareful of the maximum voltage vs frequency. If you can't find that spec, then don't buy the probe. Hint: what's the current from a 20kV 100MHz signal flowing through a 1pF capacitorThe Tektronix P6015, (and P6013) are properly specified.

author: S57UUU
author_rank: Regular Contributor
timestamp: December 03, 2023, 06:17:27 am
content: The tek HV probes have 6 (six!) compensation adjustments on the box, so there is definitely more than a series resistor there. They are not as hard to compensate as that might suggest, I did it several times. (I used them to see HV pulses on magnetron radar transmitters).I suggest you look for an used tek probe, just be careful to get the new, "dry" one, the freon liquid for the old type is extremely hard to get.
New Fnirsit multimeter: DMT-99 - Page 1
Forum section: electronics / testgear

author: RAPo
author_rank: Super Contributor
timestamp: December 02, 2023, 10:15:07 am
content: Fnirsi seems to be on a roll with new products.After the oscilloscope/multimeter/awg FNIRSI-2C23T, there is now the DMT-99.See this video:I've ordered one, just for the upcoming holiday fun. The price is about Eu44

author: csuhi17
author_rank: Frequent Contributor
timestamp: December 02, 2023, 02:04:41 pm
content: perfect, 1 more waste on the market.So I understand why I don't see another update for the DPOX180h.I wonder what the "DIY boot interface" could be, I can't see it in the user manual.
Agilent 6612C "Opt 760" board - Page 1
Forum section: electronics / testgear

author: gamalot
author_rank: Super Contributor
timestamp: November 21, 2023, 12:11:55 am
content: Today I took my 6612C apart and did some cleaning. I also took some pictures for those who are curious about what the "Opt 760 Isolation and Reversal relays" board looks like.

author: guenthert
author_rank: Frequent Contributor
timestamp: November 22, 2023, 11:17:49 am
content: Iiuc, the 6612C (and 6632B) service manual refers to it as"A6 5063-3434 1 Relay Board (Optional)". Sadly, no further hints.Is a schematic available?

author: gamalot
author_rank: Super Contributor
timestamp: November 22, 2023, 01:04:02 pm
content: Quote from: guenthert on November 22, 2023, 11:17:49 amYes, I just found it!

author: gamalot
author_rank: Super Contributor
timestamp: November 22, 2023, 01:13:02 pm
content: It's hidden in the 6632B's service manual.

author: Swake
author_rank: Frequent Contributor
timestamp: November 24, 2023, 08:34:49 pm
content: Links to the open source version of this board made by Bateau020 for 6632B power supplies (and some others):https://www.eevblog.com/forum/testgear/agilent-6632b-binding-posts/msg4466458/#msg4466458https://github.com/hb020/HP6632B_relay_boardAlso front binding posts with additional sense and ground.https://github.com/hb020/HP6632B_binding_post:

author: gamalot
author_rank: Super Contributor
timestamp: November 25, 2023, 01:47:10 am
content: Quote from: Swake on November 24, 2023, 08:34:49 pmThis design seems to have been simplified so that it is only compatible with 66xxB and will not work with 661xC.

author: gamalot
author_rank: Super Contributor
timestamp: November 29, 2023, 08:06:37 am
content: I removed the two larger relays from the board to get more layout details under them, and I noticed that the silkscreen of the relays' outline actually covered part of the guard rings.

author: gamalot
author_rank: Super Contributor
timestamp: December 02, 2023, 07:06:11 am
content: I have made some progress on opt-760 clone, schematic diagram, gerber files, and BOM are attached.
Mixed domain oscilloscopes-Any alternatives to Tektronix MDO4K series? - Page 1
Forum section: electronics / testgear

author: djsb
author_rank: Super Contributor
timestamp: December 02, 2023, 11:01:04 am
content: I recently watched the video on the Tektronix MDO4K series oscilloscopes. The video was made quite a while ago. Are there any alternatives to this series (maybe a newer model) from Tek or does another manufacturer make anything the same or better? Thanks.
OWON FDS1000 4-in-1 DSO - Page 1
Forum section: electronics / testgear

author: Randy222
author_rank: Frequent Contributor
timestamp: December 01, 2023, 04:18:56 pm
content: Interesting DSO. The move to a all-in-one model seems to be the thing these days.DSO+AG+Power supply + Multi-meter 4-in-1Not sure all the specs are good or not, but it's interesting. Directly run your dev Python code on the scope.100MHz, 1Gsa/s, 14bit ADC.https://www.owon.com.hk/products_owon_fds1000_series_multifunction_dso
Micronta 22-220 FET multimeter calibration? - Page 1
Forum section: electronics / testgear

author: BeBuLamar
author_rank: Super Contributor
timestamp: November 30, 2023, 12:46:01 pm
content: I have this old Radio Shack Micronta 22-220 which kind of a Simpson 260 wanna bee. It does have the FET front end to provide 10 MOhms input impedance for the DCV. There are a couple of potentionmeter inside which I believe for calibration. Does anyone know how to do the calibration on this thing? Besides I couldn't even find a user manual for it. I am sure I have the user manual somewhere but I can't find it. I bought it new sometime in the early 80's.

author: xrunner
author_rank: Super Contributor
timestamp: November 30, 2023, 01:47:41 pm
content: All you have to do is Google your question and you will find the answer to this. I just did and in a matter of 30 seconds it was solved. No I'm not going to give you the link because you will benefit more from doing it yourself.I don't understand why people don't do that first before limiting their search to one forum on the internet.

author: BeBuLamar
author_rank: Super Contributor
timestamp: November 30, 2023, 04:19:00 pm
content: I've spent hours searching the web and find nothing but a schematica diagram. No service manual or user's manual. Thank you very much for nothing.

author: AVGresponding
author_rank: Super Contributor
timestamp: November 30, 2023, 05:49:00 pm
content: Elektrotanya and RadioMuseum are the places to look for things like this

author: BeBuLamar
author_rank: Super Contributor
timestamp: November 30, 2023, 06:03:54 pm
content: I looked both and none was found except that is the schematic diagram.

author: Oilngas
author_rank: Contributor
timestamp: December 01, 2023, 04:07:34 am
content: Here are the voltage cal pots.

author: BeBuLamar
author_rank: Super Contributor
timestamp: December 01, 2023, 01:26:44 pm
content: Thank you for the picture and the manual.I checked it out and it's in specs so there isn't much need to calibrate but it is good to know.
Disgustado con un usuario de youtube  La J de JOA-KING - Page 1
Forum section: electronics / testgear

author: Adrian_Arg.
author_rank: Frequent Contributor
timestamp: December 01, 2023, 03:58:18 pm
content: This man shows a video about a modification of the LCR GM328, several users asked him if he could share that firmware, to which he posted a link, but it is from an older version, a navigator makes the comment that it is not the same one in the video that it shows, to which I proceeded to download and install and I saw that the lady was right. so I told him this"I just downloaded the one from the link above, or we are doing something wrong or I don't know, the octaclopator option, servo tester, temper ds18b20 and other options from the menu that you show in this video do not appear, I agree with Olga, It is not the sameI just downloaded it from herehttps://mega.nz/file/woRVnIwB#RmrIJbdS1G4DSkQk9EZeSsLU3wR04D1fzR8HOH8Ad7g"This man, displeased with my comment, repeatedly deletes it, because he doesn't say that he doesn't share it and that's it.in spanisheste señor muestra un video soble una modificacion del LCR GM328, varios usuarios le preguntamos si podia compartir ese firmware, lo que el colgo un link, pero es de una version mas vieja, a todo eso una navegante lo hace el comentario de que no es el mismo del video que muestra, a lo que procedi a descargar e instalar y vi que la señorita tenia razon. entonces yo le comente esto" Ja acabo de bajar el del enlace que esta mas arriba, o algo hacemos mal o no se, no aparece la opcion de octoaclopador, probador de servo, temper ds18b20 y otros opciones del menu que tu muestras en este video, coincido con Olga, no es el mismolo descarge recien de acahttps://mega.nz/file/woRVnIwB#RmrIJbdS1G4DSkQk9EZeSsLU3wR04D1fzR8HOH8Ad7g"este señor disgutado con mi comentario me lo borra reiteradamente, porque no dice que no lo comparte y listo.
EMCO 7122 EMC probe manual  - Page 1
Forum section: electronics / testgear

author: g4dbn
author_rank: Newbie
timestamp: November 05, 2023, 12:48:44 am
content: I have an EMCO 7122 remote EMC head unit and 7120 controller, but no fibre optic link to RS232 interface. Does anyone have a scan of the manual for the 7122? I now have the manuals for the 7120 and the associated 7140 RS232 controller and fibre link. If I can't find an RS232 interface, I'm going to try to reverse-engineer the fibre protocol. I need to know what sort of fibre connector the 7120 needs.

author: elee
author_rank: Newbie
timestamp: November 30, 2023, 11:29:41 am
content: While searching for something else, i probably found what you look for:https://www.ets-lindgren.com/get-manuals/7121-399111-F.PDFand link to all old manuals:https://www.ets-lindgren.com/support/archived-manuals?page=Literature-Manuals-Page
Help figuring out my 8648C Signal Generator?.... - Page 1
Forum section: electronics / testgear

author: TERRA Operative
author_rank: Super Contributor
timestamp: November 29, 2023, 11:25:28 pm
content: I recently picked up a HP 8648C Sig Gen and am trying to figure out exactly what it is...It had the serial and option stickers removed (A semi-common thing here in Japan when companies liquidate old gear, because reasons) so I'm trying to figure out just what this unit is fitted out with.Luckily the instrument stores the serial number in its memory, so I was able to use GPIB to read it out: 3426A00711The three plug-in modules inside are a little strange when checking their part numbers... The part numbers don't seem to exist in the service manuals for later serial numbers that I have found for download (Although ebay has some paper manuals that cover my serial prefix), but they do exist when checking the Keysight Parts Finder website.Details as follows:A4: 'OPT REFERENCE' P/N: 08647-61046 -> Described in Keysight Parts Finder as 'Replaced by 08648-60042', which is 'MOD Assembly REF - 1E5' so I guess I scored the option 1E5, high stability time base.A5: 'SIG GEN SYNTH' P/N: 08647-61050 -> Described in Keysight Parts Finder as as 'RF Synthe Assembly For 8648B' (I assume the B designation isn't exclusive to the B model as there are many parts shared between B, C, and D models?)A6: 'RF OUTPUT' P/N: 08648-60116 -> Described in Keysight Parts Finder as as 'MOD AY-OUTPUT'.Does anyone know why these part numbers are different to the manuals (Both Agilent and HP branded manuals)? Maybe I have an older unit and they are just older part numbers?Also, does anyone know what 'Mod AY' is?
Hakko fx-950 analog edition. - Page 1
Forum section: electronics / testgear

author: riyadh144
author_rank: Unknown
timestamp: February 07, 2021, 05:59:20 pm
content: So I am really attracted to the analog fx-950, I really like it being analog.I can buy it of ebay, but it says it is rated for 100V, it looks close enough to the 120V in the USA, but I am not really sure it will do it without a transformer.Does anyone have any experience with that?https://www.ebay.com/itm/HAKKO-FX-950-Soldering-iron-station-100V-2-pole-grounding-plug-FX950-01-Courier/313377231401?epid=1740121009&hash=item48f6bd1229:g:q~oAAOSw6bNf~D8JThanksRiyad

author: Mikek400
author_rank: Regular Contributor
timestamp: November 29, 2023, 12:28:13 pm
content: Replying to old post just for reference in case someone else wants to know the answer to this.Short answer is: Without modifying, no but it is easy to modifyWho doesn't like hacking?I recently bought a 100V Hakko FX-950. Wanted a FX-951 but after using one a lot at work don't like the controls so decided to go for the analog and cheaper FX-950Seemed to work ok on 120v at first. Then after a few minutes it shut off. Taking out tip etc didn't make it wake back up. Power off/on and it worked for a few minutes. Best guess is volt regulator is overheating, something is overcurrent or IC is deleting an error in how much it is heating up. This was quite a surprise to me since I've used plenty of 100V devices on 120V without issue or in some cases improved performance.Measured voltage on transformer inside and was at 32VAC which is a bit high. Connected the FX-950 to a 100V step down transformer(105V measured) and got 28V. Put back together and works great on the step down transformer.Not wanting to have to use my step down transformer all the time with this thing I decided to fix it. Thought about replacing the transformer but before investing another $30 on that (available from Hakko) I tried some properly sized magnet wire and wrapped it around the existing transformer about 15-20 times. Connected it such that it is subtracting voltage and got it to 28V same as connecting it to my step down transformer.Anyhow it works now without the step down transformer and it is a pretty easy mod. Although many might say it isn't a good solution. In that case you can buy the $30 transformer for 120V that Hakko sells. Don't have the P/N ready but found it before.Suppose you could remove part of the winding in the existing transformer as well. That was my first thought but I wanted to keep 100V capability since this iron may travel back to 100V land again with me.If there is any interest I might post more detailed instructions although there isn't much to it.

author: Mikek400
author_rank: Regular Contributor
timestamp: November 29, 2023, 07:29:22 pm
content: There was another thread where "Attorney" went through the same problems I did with 120V on the FX-950,He replaced the transformer with the Hakko OEM part it seems. Hakko part number B2836.https://www.eevblog.com/forum/beginners/hakko-fx-950-line-voltage/Quote from: Attorney on January 05, 2021, 01:47:52 am
163 A - 400 Hz CT Testing For Aviation Generator Application - Page 1
Forum section: electronics / testgear

author: SteveR
author_rank: Newbie
timestamp: November 28, 2023, 09:16:48 pm
content: Hi All,What power supply equipment could I use to provide a 400 Hz, 163 A rms supply to support the testing of a wound Current Transformer installed to an aircraft power generator?The test requirements are as follows:"The assembly should provide a voltage of 3.45 as measured across a 10 ohm, 3 watt burden resistor, when a single turn primary current of 163amps rms 400Hz is flowing."Thanks in advance for your inputs!

author: bdunham7
author_rank: Super Contributor
timestamp: November 28, 2023, 09:30:27 pm
content: You could use two Fluke 52120A transconductance amplifiers in parallel driven closed-loop by a Fluke 5730A calibrator. Or they can be driven open-loop by any calibrator with the result of a little less accuracy. If you need this level of accuracy, then it won't be cheap. What level of accuracy do you actually need here?

author: rvalente
author_rank: Frequent Contributor
timestamp: November 28, 2023, 09:35:59 pm
content: Check chroma and itest AC power supply, they often go up to 1KHz.Maybe... using a big ass AB 10KW audio amplifier with an external current loop?

author: SteveR
author_rank: Newbie
timestamp: November 28, 2023, 09:45:42 pm
content: Many thanks for your reply, full requirements with tolerances attached.

author: rvalente
author_rank: Frequent Contributor
timestamp: November 28, 2023, 11:08:11 pm
content: Quote from: SteveR on November 28, 2023, 09:16:48 pmProbably these specs was written in the time where big electrical machines were used. I'd says its a suggestion for a GPU (ground power unit) + transformer.

author: floobydust
author_rank: Super Contributor
timestamp: November 28, 2023, 11:38:26 pm
content: You can spoof the high current to test CT's.I'll take a mains power transformer like MOT or big toroid and put a few turns of heavy wire on it like #6 or #4AWG to make a low voltage secondary. What you need is around 2VAC at say 200A (~400VA). Then run that through the CT under test.The primary could be energized by 50/60Hz and 400Hz with a Chroma to see if the burden resistor etc. is reasonable for meeting the spec. Watch the CT's phase might be important too for the protection module.

author: TurboTom
author_rank: Super Contributor
timestamp: November 29, 2023, 06:06:39 pm
content: if the current transformer is to be tested separately and the single high current (primary) conductor can be removed, you could put a test winding there with 163 turns and just feed in a current of 1A which should be easily possible with an average audio amp.Otherwise, my approach would be making a step-down transformer with approximately a 163:1 turn ratio on a decently large, low-loss core and some copper sheet metal as the single or two turn secondary. A clamp type current meter should do for checking the test current is within tolerance.
Hanmatek Ho52 scopemeter - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: March 01, 2023, 02:28:54 am
content: Got to be too good to be true:https://www.amazon.co.uk/HANMATEK-HO52-Digital-Oscilloscope-Multimeter/dp/B08VRDG94Nhas anyone get one to test/deconstruct?David

author: coppercone2
author_rank: Super Contributor
timestamp: March 01, 2023, 05:23:13 am
content: Maybe it fell off the back of a Ha'tak

author: catforalice
author_rank: Newbie
timestamp: November 29, 2023, 04:16:08 pm
content: I have such. if you buy it for $100 like me, then it’s a good deal in my opinion... It's good as an oscilloscope (if you need wide screen & 2 channel). At least it is quite suitable for repairing power supplies. Externally it looks high quality inside and outside, the wires are good. But the multimeter is not very good: it is slow, it does not measure capacitance above 2mF, and the readings twitch when measuring resistance. The oscilloscope menu is stupid and ill-conceived. The oscilloscope has a couple of software errors related to the measurement of rms values. I will say this: I had a Fnirsi 1C15 and I coped with it perfectly well. I miss them.P.S. I work old soviet analog oscilloscope such like C1-94, C1-112, C1-64 all my life, after that Hanmatek / Fnirsi - dam good!
Scope recommendation for SCA - Page 1
Forum section: electronics / testgear

author: zzattack
author_rank: Regular Contributor
timestamp: November 28, 2023, 11:18:55 am
content: Apologies for probably yet another one of 100 similar topics, although I have a somewhat specific use case in mind.I'm looking to do some side channel analysis where two specific scope properties are highly beneficial:- high frequency since we must typically oversample an unknown asynchronous clock- excellent facilities to get the traces onto desktop PC for post-processing; up to 1M traces is not uncommonTwo candidate series are under my consideration and I'm looking for some advice on which way to go.1) is a USB3 picoscope which excells in the PC interfacing but budget limitation would not stretch beyond the 200MHz 5444D or 300MHz, perhaps the 500MHz 6424E if I really _really_ stretch it2) a higher-end Chinese like the 800MHz Rigol DHO4804, allowing for an affordable 800MHzI do not believe 12-bit resolution is a necessity since it comes at cost of sampling frequency, but this is mostly unfounded.Features like picoscope's rapid block acquisition seem very very useful for SCA. On the other hand, with 'only' 200/300MHz within budget, we hit limitation in the range of devices where we can apply 10x oversampling.Can anyone recommend one over the other for my intended purpose?

author: alm
author_rank: Super Contributor
timestamp: November 29, 2023, 01:36:57 pm
content: Another option if you want to consider used it to buy an older Windows-based scope that allows you to do processing directly on the scope. I know for example that Lecroy WavePro 7000(A) series and WaveRunner 6000 series and their later scopes allow you to write software in a number of programming languages that can directly interact with the acquisition system and sample memory. SeeXDEV Advanced Customization Package. The advantage is likely lower latency / higher throughput and more bandwidth for your buck. You might be able to find a 3 GHz WavePro 7300A for $1000-2000 plus shipping from the US. Downside is generally no warranty, the front panels are flimsy and will likely have cracks in them, and you'll be developing for Windows XP or maybe Windows 7 for more modern scopes in that range, like the WavePro 7 series. For at least the WavePro 7000 series there aresolutions for getting the XDEV option.I don't know if other Windows-based scopes like Tek and Agilent/Keysight offer similar features. I'm guessing not since they do a lot more processing in ASICs instead of on the main CPU.New scopes that do the same will likely require you to take out a second mortgage on your house.
Siglent SVA1015X - Page 1
Forum section: electronics / testgear

author: robkar02
author_rank: Newbie
timestamp: November 29, 2023, 07:49:00 am
content: Hello,I just bought a new SVA1015X and are new to this equipment, iam a ham radio operator and would like to learn more about it. But my question now is, is it possible in a simple way to stop the trial clock, so i can keep all the options permanent, with the possibility to go back as i still have warranty on the unit.Best RegardsRobert

author: tautech
author_rank: Super Contributor
timestamp: November 29, 2023, 08:09:58 am
content: Welcome to the forum.The only improvement for SVA1015X are getting options permanent and you should do some study in the SVA, SSA and SSA hack threads.https://www.eevblog.com/forum/testgear/siglent-sva1015x-1-5ghz-spectrum-vector-network-analyzer-(coming)/https://www.eevblog.com/forum/testgear/siglent-ssa3000x-spectrum-analyzers/That should keep you busy for a bit.

author: robkar02
author_rank: Newbie
timestamp: November 29, 2023, 09:52:56 am
content: Ok thanks for the advice tautechBest regardsRobert
Handheld LCR Meters – Dimensions of PCB - Page 1
Forum section: electronics / testgear

author: hatte
author_rank: Contributor
timestamp: November 29, 2023, 02:14:06 am
content: I am in the process of attempting to design two adapter PCBs for handheld LCR meters that provide:Four in-line BNC connectors, allowing attachment of cabled kelvin clips and component probe fixturesA ZIF socket and a series of SMD footprints for easy measuring without cables taking up spaceTypes of probes and fixtures that can be connected to 1. above:I know that similar adapter designs exist, but none of them provide "standard" spacing, they are designed for specific LCR meter models and some of them require too much hand soldering to my taste.I will attempt to make my design (riser-PCB, probe-PCB and 3D printed enclosure) universal, so it will fit as many handheld LCR meters as possible.To achieve that, I will need to know the order and dimensions of the "kelvin PCBs" for the various handheld LCR meter models currently marketed, and this is where I could really use you guys' help in providing me with information about handheld LCR meters you have access to.The order of the slots vary, with the DER DE-5000 being the "odd man out". In the following list "H"/"+" are synonymous as are "L"/"-" and "Guard"/"G":East Tester ET43x: H, L, GHantek 183x: H, L, GKeysight U1733C: H, L, GUNI-T UT622: H, L, GBK PRECISION Model 8xx: H, L, GGW-INSTEK LCR-91x: H, L, GDER DE-5000: G, L, HThe information that I require to design a universal "riser" PCB are (see illustration):LCR Meter Brand and ModelOrder of slots (e.g. H, L, Guard)Height of PCB edge fingers beyond any enclosure (H)Width of PCB edge fingers (Aw, Bw, Cw)Position of PCB edge fingers (B0, C0)Thickness of PCB edge fingersExample:Meter: Hantek 1832CSlot order: H, L, GuardHeight (mm): H=13.5Widths (mm): Aw=14.2, Bw=14.2, Cw=12.2Position (mm): B0=18.8, C0=39.6Thickness (mm): 1.0Thank you in advance for any assistance you can provide to make this project possible.PS: I will be making the adapter PCBs available for sale (possibly on Tindie), as well as making PCB Design Files (KiCad) and Enclosure 3D Models available on GitHub once I have verified the functionality and fit.

author: DeepLink
author_rank: Regular Contributor
timestamp: November 29, 2023, 06:09:48 am
content: I had the same idea, and made some alreadyMine is designed for the Hantek 1833CDon't have the dimmensions here, but will find them later todayI had them produced with black soldermask (for the aesthetics) and gold plated surface (for durability)Works like a charm, for both tweezers and my SMD fixtureMade 2 different versions, one "low" for tweezres and one "high" for SMD fixtureAnd I have some spare PCB's

author: DeepLink
author_rank: Regular Contributor
timestamp: November 29, 2023, 06:34:27 am
content: Meter: Hantek 1833CSlot order: H, L, GuardHeight (mm): H=12Widths (mm): Aw=14.5, Bw=14.5, Cw=12.5Position (mm): B0=19.0 C0=41.0Thickness (mm): 1.6Spacing between BNC's are 7/8" = 22,225mm and fit's my HP fixture
Siglent SHA850a Handheld Series - Page 1
Forum section: electronics / testgear

author: Dave89
author_rank: Newbie
timestamp: December 03, 2023, 04:33:56 pm
content: Hi all,I'm looking at purchasing a Siglent SHA852a handheld Spectrum Analyser with all options enabled but I can't find much in the way of reviews, I wondered if anyone has experience with this model? I.e. any known issues/ bugs, do any of the specs not measure up in real life, anything to be aware of etc.If I've missed a post/ review/ teardown of this unit elsewhere, apologies and please point me in the right direction!Thanks!Dave

author: tv84
author_rank: Super Contributor
timestamp: December 03, 2023, 04:38:00 pm
content: https://www.eevblog.com/forum/testgear/siglent-sha800a/

author: Dave89
author_rank: Newbie
timestamp: December 03, 2023, 04:52:01 pm
content: Thanks very much!