hybridfree/eevblog-posts huggingface dataset:
QL564 TTi power supply - Page 1
Forum section: electronics / testgear

author: RogerThat
author_rank: Regular Contributor
timestamp: October 23, 2021, 07:31:18 pm
content: I couldn’t find any post on this power supply so here comes some pictures and impressions.The mechanical construction is nothing special, bent steel(no sharp corners) with self taping screws on the lid. Plastic feels like ordinary cheap plastic. Buttons has a bit soft click but the rotary is fine. The rotary can be spun fast using the indent. It can step either 1/10/100mV and 1/10/100mA per step. Voltage and current limit can be set using the numerical keypad also.The unit starts in a few seconds and the output is off by default. The output on/off is via a transistor and not relay. When turning the unit on or plugging the unit in with power switch set on, there are a few short spikes, see scope pictures.I tried measuring noise using my Rigol 1054z. Probe set to 1x, BW limit to 20Mhz. Scope noise is 3mVPP and connected across my resistor it shows around 8mVPP.I was surprised to find guard traces on the PCB. The main DIL package with guards is a 1 to 8 MUX(HEF4051BP) with the 1 connected to a 16bit DAC(MAX5441).And, the pictures.

author: RogerThat
author_rank: Regular Contributor
timestamp: October 23, 2021, 07:34:09 pm
content: And scope picturesThis shows power on spikes, out put off.Current limit over my 15ohm resistorNoisePower on directly to current limit.

author: arvidb
author_rank: Newbie
timestamp: November 07, 2022, 11:42:08 am
content: How are you feeling about your supply, now one year later?How's the acoustic noise - is the fan loud when the supply is idle or not working hard?Do you know if there's any energy in those power-on spikes - are they still there with a load attached (say 10 kΩ)?

author: RogerThat
author_rank: Regular Contributor
timestamp: November 24, 2022, 02:26:19 pm
content: Hi,I haven't tested the energy in the spikes so can't say, but been having no problem with that. Sound is quite loud I would say, I turn it off when not in use. Fan speeds up under load....it is not regulated by temperature but by the power output...as soon as power goes up, the fan increases.Only real complaints I have is with the remote control. I've been in contact with their service dep but haven't been able to get it to work(it some issue with the windows software).When I don't need the higher voltage/current I always use my HP 3610A since it is silent...
OWON HDS272s eerom dmm please help - Page 1
Forum section: electronics / testgear

author: vozertolai
author_rank: Newbie
timestamp: November 24, 2022, 09:47:07 am
content: i have 1 hds272s device which is having eeprom 24c08 error, when i removed the eeprom chip the power supply to the dmm chip increased to 3.3 volts so i need a copy of the eeprom can anyone provide 1 copy of it thank you very much, sorry my english is not good
Any other affordable data logging multimeters? - Page 1
Forum section: electronics / testgear

author: JenniferG
author_rank: Frequent Contributor
timestamp: November 23, 2022, 07:30:59 am
content: I really like the UT61E with it's DB9 RS-232 interface. Reading data from it on my Arduino Mini Mega 2560 -- which sports 4 serial ports (UARTS)I was thinking about getting another to read two different things at same time; I can get another for $50.. so affordable.But.. I was wondering is there another meter I should get that would perhaps complement the UT61E better? Like perhaps some features or accuracy (etc) the UT61E might not have?I've read that the Brymen multimeters can data log with an add on module. Is the add on module USB or DB9? I really like the DB9 interface as it plays well with MCU's which usually don't have ability to be USB host (at least built in). How much is the data logging add on module for Brymen? Is there a EEVBlog Brymen available in the USA?I wish I knew how to hack my Gwinstek GDM-8251A. It has an RS-232 port but it only sends out TRUE or FALSE (PASS/FAIL) for comparison tests, from what I read from the manual. This Gwinstek has both USB and DB9/DB25 .. all the connectivity is there, they just couldn't be creative enough to send packets of information over serial like the UT61E does -- sigh.EDIT: Link to my Arduino C++ class library I am working on for UT61E & DB9 :https://github.com/JenniferGDev/ArduinoUT61E

author: BillyO
author_rank: Super Contributor
timestamp: November 23, 2022, 02:22:29 pm
content: There is the Yi Hua V&A VA18B. (Under other names too)https://www.va-multimeter.com/autoranging-digital-multimeter-with-relative-measurement-trms-function-va17-va18b/Very plasticky feeling meter, but decent features and performance as long as you are not looking for 5999 counts. It is compatible with Sigrok if you use that.Sells for around $50.
Looking for a portable ( 230/400V 50Hz ) power measuring device. - Page 1
Forum section: electronics / testgear

author: The Soulman
author_rank: Super Contributor
timestamp: November 22, 2022, 08:20:01 pm
content: As the title states, I'm looking for a portable device that could measure and log real power in three-phase systems/distribution panels.Ideally it would record up to a weeks worth of data (1 sample per 5 minutes = +- 2000 samples).Goal is to monitor power "consumption" for several three phase distribution panels, all in a 230/400V 50Hz environment ranging from 50 to 400 Amps.Obviously the ability to use (different) current clamps is mandatory, so is a cat IV input rating.Anybody has any suggestions for aportabledevice that would be suitable?I am aware of the different din-rail and panel-mount devices, for this instance a portable solution is required.

author: Martin72
author_rank: Super Contributor
timestamp: November 22, 2022, 09:26:21 pm
content: Hi,One of the cheaper models is the peaktech P4145, with CAT III 1000V/CAT IV 600V.Integrated Logger, but the recordlenght could be a little bit too short ( up to 1week)https://www.peaktech.de/uk/PeakTech-P-4145-Power-analyzer-with-RS-232-C-interface/P-4145But this is the direction where you could look at.Of course Fluke is "top of the pops" ( we got actually one on loan here...beast with integrated report function..), but also top of price.Although....not really - Gossen is more expensive.
Easy free hack to increase 1x probe bandwidth?  - Page 1
Forum section: electronics / testgear

author: TopQuark
author_rank: Frequent Contributor
timestamp: November 22, 2022, 03:54:10 pm
content: For working on low level signals, I like using 1x probes, but the BW of these probes are quite low, often limited to around 10MHz or so. Reason being the distributed R, L, C in the lossy coax cable used in scope probes.Today I had a silly thought: If the distributed loss in the cable is attenuating the HF contents, why not just make the cable shorter? I mean most of the time the probe cables are longer than I need anyways.So I took a x1/x10 probe that I don't use anymore, snipped half of the cable length off, and terminated the cable with a crappy screw terminal to BNC adapter (terrible, but I don't have anything better on hand), and what do you know, the rise time decreased from 32.6ns to 19.6ns, giving us roughly 66% more bandwidth.Halving the cable length didn't quite give us double the BW, probably because of the input capacitance of the scope channel being held constant. Signal fidelity looks fine. The 10x mode doesn't work properly anymore, but I have enough dedicated 10x probes anyways, I don't really care, I'll just glue the switch to x1.So yeah, what do you think? Am I missing something? Or is it really that easy to get a better x1 probe (besides the listed drawbacks) ?

author: alm
author_rank: Super Contributor
timestamp: November 22, 2022, 04:03:17 pm
content: This is a valid technique. If you look at the specifications for the oldTektronix P6101 1x probe, which was offered in 1m, 2m and 3m lengths, you see the bandwidth halve for every extra meter of length. I don't see a down side other than the obviously shorter length, and the need to modify the probe since I don't think anyone sells 1m probes anymore.For 10x and higher probes this would also improve their bandwidth and input capacitance, but it would require changing components in the tip and possibly compensation box to match the lower cable capacitance.

author: noisyee
author_rank: Contributor
timestamp: November 23, 2022, 01:47:54 am
content: That actually works fine. I don't see any drawback.I like to use a short coaxial with a damping resistor directly solder between the test point and the center conductor. So I always keeps some low value axial resistor in hand.

author: jasonRF
author_rank: Regular Contributor
timestamp: November 23, 2022, 07:58:16 am
content: Nice hack - especially since you had extra probes laying around!For small signal measurements I picked up one of the Cal Test ge2501 x1 probes. It is 1.2m long and rated for 55 MHz, although if I recall correctly mine seems to be about -6dB at 55 MHz (-3dB at 35). The longer (2m) ge2502 is supposedly 35 MHz.
HP3478A Display problem - Page 1
Forum section: electronics / testgear

author: davebutler
author_rank: Newbie
timestamp: November 12, 2022, 03:02:36 am
content: Help sought from the brains trust please.I picked up this HP3478A for a song knowing it had a display problem.It flashes up part segment & sometimes th full display for a few seconds the nothing for about 30 sec to min then another quick flash.(See pics)Any help or suggestions would appreciated.Thanks in advance.CheersDave B.

author: PixieDust
author_rank: Frequent Contributor
timestamp: November 13, 2022, 02:01:22 am
content: I'm far from an expert but from what I've seen on the HP3478A, the display is impossible to get anywhere from other than another unit with a working display.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 14, 2022, 07:13:08 am
content: The symptom makes me think it is not the display itself, but more likely to be a power supply or LCD driver problem.

author: Oldtestgear
author_rank: Regular Contributor
timestamp: November 24, 2022, 03:29:13 pm
content: The display used in the HP 3488 switch unit does fit the 3478A. The only issue is one of the Ohms indicators (2 or 4 wire) is displayed as a marker rather than the correct symbol. It was possible to buy the 3488s very cheaply a while ago, especially without the modules. Been there, done that & rescued a 3478A from scrap.FWIWPhil

author: AVGresponding
author_rank: Super Contributor
timestamp: November 24, 2022, 04:51:28 pm
content: The 3468A uses the same display as well, afaik? You might find a broken one with a good display. A 3478A is a much more worthy destination for the display anyway...
[Question] Oscilloscope Probe Bandwidth - Page 1
Forum section: electronics / testgear

author: PixieDust
author_rank: Frequent Contributor
timestamp: November 23, 2022, 06:55:40 am
content: Hi, I watched this video:In it, there's mention of a rule of thumb that oscilloscope probes should be x1.5 the bandwidth that you're testing. There's talk of "System Bandwidth". It's all fair enough.What I don't understand is why are oscilloscopes of say 100MHz sold with 100MHz probes then? Shouldn't they come with 150MHz probes? Or are 150MHz probes simply marketed as 100MHz, but in reality they are 150MHz probes? But in the video, it specifically says that if you need say a 1GHz scope, you should be using a 1.5GHz probe! Confused.

author: tautech
author_rank: Super Contributor
timestamp: November 23, 2022, 07:12:38 am
content: Probe BW doesn't roll off a cliff and can easily do 50% beyond rated BW.A few years back there were concerns if 100 MHz probes were still suitable to be used with a 200 MHz hacked DSO.A member swept a few probes and graphed them and the 100 MHz one was barely 1dB down on the 200 MHz rated one.As the industry determines frequency rating by a -3dB rolloff there is a generous margin before any part of the measurements system fails to meet its BW rating and then there's also instrument accuracy rating to also consider......some+3%.

author: PixieDust
author_rank: Frequent Contributor
timestamp: November 23, 2022, 07:46:17 am
content: Many thanks.

author: noisyee
author_rank: Contributor
timestamp: November 23, 2022, 08:15:16 am
content: It's meaningless to specify bandwidth alone for a high impedance passive voltage oscilloscope probe. In fact, they are already specified as system bandwidth.A specific oscilloscope probe will only fit certain oscilloscope. Passive probe relay heavily on compensation to achieve target bandwidth, which is related to a certain front end circuit.Here is how LeCroy said on their website:QuoteFor most brand, you can find a probe compatibility list on their website or probe datasheet.To my own experience, a keysight compatible 500 MHz probe will have strange frequency response above 50 MHz on a LeCroy, Tek, or Siglent.

author: PixieDust
author_rank: Frequent Contributor
timestamp: November 23, 2022, 08:56:06 am
content: I have a 2 channel analog scope that didn't come with probes. Ended up going for two pairs of CalTest x1 and x10 probes. I had no idea probes were so finicky!
HP 8640B - OPT 323 Service Manual - Page 1
Forum section: electronics / testgear

author: SuperMario
author_rank: Contributor
timestamp: November 16, 2022, 03:04:27 am
content: Hi,I am looking for the service manual for HP 8640B - OPT 323. This is a military version of HP8640B. The problem is in the frequency counter circuit, it displays 60% of set value. RF output is at correct frequency. I have manual for the 8640B but counter part is different. If anyone can help with this issue please let me know.Thanks.

author: sbrom
author_rank: Contributor
timestamp: November 16, 2022, 04:31:43 pm
content: Quote from: SuperMario on November 16, 2022, 03:04:27 amDon’t know if this is real, but here’s a manual listed for sale, $65. I’ve not seen a free pdf with the option 323.https://fairradio.com/?s=Usm-323

author: alm
author_rank: Super Contributor
timestamp: November 16, 2022, 04:40:57 pm
content: It might be worth emailing Dave atArtek Manualsto see if any of the 7 different scans he sells cover option 323. Not free, but not $65 either. The 8640B-AN/USM-323 manual sounds like it might be the right one.

author: joeqsmith
author_rank: Super Contributor
timestamp: November 16, 2022, 04:41:21 pm
content: https://antiqueradios.com/forums/viewtopic.php?f=8&t=252760

author: SuperMario
author_rank: Contributor
timestamp: November 17, 2022, 02:44:32 am
content: Ordered one from ArtekManuals for $12.50. Still waiting for download link.Thanks for the suggestion.

author: LazyJack
author_rank: Frequent Contributor
timestamp: November 17, 2022, 09:05:07 pm
content: They usually send the link in a day or two. It seems to be a somewhat manual process. They are very helpful and responsive, should there be any problem.It is well worth the waiting, they are very high quality scans.

author: SuperMario
author_rank: Contributor
timestamp: November 19, 2022, 03:06:49 am
content: Got my manual and fixed the unit. Thanks everyone for the suggestions.

author: Dave Wise
author_rank: Regular Contributor
timestamp: November 21, 2022, 08:16:08 pm
content: Yay! So what was wrong?
FSP30/40 embedded windows xp for spectrum analyzer. - Page 1
Forum section: electronics / testgear

author: g7kbr67
author_rank: Regular Contributor
timestamp: November 11, 2022, 09:18:33 am
content: Hi AllAfter following a previous message on the group regarding a failure of a drive in a Rohde and Schwarz FSP40.I have a FSP40 which when boots saying, I have a missing file (Windows boot-up). I took the top off and I have a Compact Flash drive with the following information on it.Part No. 1303.0417.07, Flash Disk for R&S FSP with Windows XP.Can I purchase a standard compact flash drive? Is it a 32GB one?Also Is the build the same ISO available for download on this site? From K04BB's website.http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=Rohde_Schwarz/Rohde_Schwarz_FSP?See photos below.RegardsPaul

author: g7kbr67
author_rank: Regular Contributor
timestamp: November 17, 2022, 09:02:42 am
content: UpdateHi have tried using the image on this original message, I am using a USB stick as the boot device with the image on. But I get a blue screen when it boots, " A problem has been detected and windows has been shut down to prevent damage to your computer"I have attached the jpg to the message.RegardsPaul

author: coromonadalix
author_rank: Super Contributor
timestamp: November 18, 2022, 03:37:06 pm
content: how did you extract this iso ?? power iso, ultra iso have settings for boot device iso sources ...or you could re-install from scratch if you have mobo bios access and put an bootable device like an cd-romrecover the missing drivers afterwards

author: g7kbr67
author_rank: Regular Contributor
timestamp: November 21, 2022, 07:55:59 am
content: HiI used Rufus to build the USB stick, when you say install from scratch. I could use a CDROM drive and build the Embedded Windows OS. But I am not sure what version and where to get it from? I have the original Compact Flash drive which I hope has the calibration data on it ok. Can the firmware still be download from a site for the build on a fresh version of embedded XP.RegardsPaul
Marconi 2955 parts - Page 1
Forum section: electronics / testgear

author: johngp
author_rank: Newbie
timestamp: November 19, 2022, 11:05:43 am
content: Hi All,Recently obtained a Marconi 2955. It's in extremely good condition but has one rather large problem....... it came without an AB4 processor board!So, if ANYONE has one spare and would like to sell it, I'm interested. I know the board holds all the calibration data, but I can get over that.Thanks.
Hantek 6074BC:  Surprising results - Page 1
Forum section: electronics / testgear

author: BillyO
author_rank: Super Contributor
timestamp: November 22, 2022, 04:42:25 pm
content: Hantek should just stick to making cheap USB scopes. They seem do a decent enough job at that.Here is a screen shot from a ~$200 6074BC, supposedly 70Mhz 4ch. USB scope, with a sweep time of 5ns/div.It shows a 10% to 90% rise time of 2.3ns!According to this page at Tektronix:https://www.tek.com/en/support/faqs/how-bandwidth-related-rise-time-oscilloscopes#:~:text=Historically%2C%20oscilloscope%20frequency%20response%20tended,Bandwidth%20x%20rise%20time%20%3D%200.45.That equates to a bandwidth of .45/2.3 GHz or ~ 190MHz!Did I get something wrong or are these cheap scopes highly underrated?

author: thm_w
author_rank: Super Contributor
timestamp: November 23, 2022, 12:58:00 am
content: As you noticed here:https://www.eevblog.com/forum/testgear/hantek6074bc-hack-to-250mhz/Its the same hardware as in the 250MHz model, and sample rate is 1GS/s, so its not too surprising.

author: BillyO
author_rank: Super Contributor
timestamp: November 23, 2022, 01:10:54 am
content: I guess with Hantek's apparent quality control it's not such a stretch to have a few that are software configured for 200MHz to 'leak' out as a 70MHz units.
Tek DPO7000 and TDS7000 bandwidth upgrades  - Page 1
Forum section: electronics / testgear

author: vexorg
author_rank: Newbie
timestamp: November 18, 2022, 11:15:15 am
content: Is there a method for upgrading the bandwidth on these scopes?They are long obsolete now, and if memory serves, the bandwidth was limited by firmware, not hardware.
BK Precision 1801 Frequency Counter...what is missing on the back? - Page 1
Forum section: electronics / testgear

author: W3KW
author_rank: Contributor
timestamp: November 17, 2022, 11:14:40 pm
content: The back panel of the BK Precision looks like there are two options that are not installed. There appears to be a slider switch punch out and possibly a BNC knock out. They are pre-pressed but not open. Does anyone have a version that has something in those knock-outs? I may add a rear BNC and use the counter with ham radio. I don't really care if the addition pulls the frequency of the counter off a bit. I'm in the thing now and have replaced the electrolytics, so while it's torn apart, why not? These are cheap and I own two anyway.Anyone know what the knock-outs are for? Anyone add a rear BNC?WesW3KWManual with Schematic is attached.

author: W3KW
author_rank: Contributor
timestamp: November 18, 2022, 02:06:27 am
content: Photos attached.

author: W3KW
author_rank: Contributor
timestamp: November 18, 2022, 02:07:47 am
content: Front.I don’t know how to post multiple photos using my iPad.

author: Gertjan
author_rank: Frequent Contributor
timestamp: November 18, 2022, 06:35:28 am
content: The answer to your question is in the manual you posted.In the introduction, page 4: "Provision has been made for the user to convert the instrument to operate from an external time base when extreme accuracy is desired."See also page 11, under the header "E Modifications".The details are in the schematic, drawn under the power supply.The internal / external switch is drawn under the power transformer, with A,B and C. Ext Ref output is F, and Ext Ref input is D.Regards, Gertjan.

author: W3KW
author_rank: Contributor
timestamp: November 18, 2022, 02:11:07 pm
content: Wow. Humbled. I studied the schematic fairly thoroughly and did see A-D and 1-4 but didn't put 2 and 2 together. A and B are linked by a trace on the board. I assumed were a switch an option there, a jumper would have been used. I assumed poorly. I merely scanned the photos for I/O on the front and rear panels in the manual, thinking the answer would be there. READ the manual man! Sorry. Thanks for pointing out all my laziness! Ha.I will reach out to BK and ask if the Modification Instructions are still available and post them here if I can get my hands on them.Thanks for the help.Wes
USRP2920 Teardown Pics - Page 1
Forum section: electronics / testgear

author: Electro707
author_rank: Contributor
timestamp: November 17, 2022, 06:52:18 am
content: I was able to get my hands on a USRP2920 thru my university (University of New Haven), and I decided (with prior permission of course) to tear-down the SDR and have a look what's inside, as well as take (what I hope are) decent quality images of the inside.The picture dump can be found in this Google Drive folder:https://drive.google.com/drive/folders/16ghueGa5GzQUGbBPaUof810jEpiQ5hHx?usp=sharingI would have written a blog post about it and post-processed the pictures (I have the RAW files), but it is 2am as I am typing this and am too tired to do so.If you are interested in seeing what is underneath the input PCB where the FPGA lives, let me know. I didn't go that far in this teardown...yet.Here are a couple of things that I found that are interesting so far, not a complete list and not in any particular order:- The RF input is attached to the input PCB with coax instead of a direct-connection. This probably makes sense for the high speed we are dealing with, maybe. Makes it look like a heart- Some inductor porn- The TX/RX1 input has a filter in series before the connector, but RX2 doesn't- One of the jumpers is a genuine marked M3 jumper, which I have never seen before neither did I know that M3 made jumpers
Tek TDS3034B escope suddenly unreachable over ethernet - Page 1
Forum section: electronics / testgear

author: bschwand
author_rank: Contributor
timestamp: November 16, 2022, 10:30:23 pm
content: Hi all,I have a Tek TDS3034B scope that was working fine with escope, the web-based GUI. Suddenly I can not reach it, even though the network is good (I can ping the scope) and I can even still print scope screenshot to my network printer. So I am puzzled, the network is clearly still configured correctly. I tried to run nmap, and I see two ports open , 80 and 111. But any connection attempt to port 80 times out.Any idea what is going on ?I also tried erasing the NVRAM through the config menus, did not help.I saw some posts here about 3014 having network issues (losing MAC address) because of some battery backup ram going bad. But the MAC seems fine and unchanged... should I try to change that nvram ? how hard is that and which part would be appropriate to replace with ?Any help appreciated.Edit: this scope has a very low runtime (50 hours). I can see the MAC address is valid according to what is posted on this forumhttps://www.eevblog.com/forum/testgear/tds-1000-2000-3000-bw-hack/msg4046458/#msg4046458and time is kept running although has a very slow drift

author: sicco
author_rank: Regular Contributor
timestamp: November 17, 2022, 05:10:29 am
content: https://www.eevblog.com/forum/testgear/tds3012b-ethernet-configure-failure/
Rigol MSO5000 AWG question - Page 1
Forum section: electronics / testgear

author: jeffjmr
author_rank: Regular Contributor
timestamp: November 17, 2022, 12:12:30 am
content: I find the documentation on the AWG a bit lacking.Perhaps someone more familiar can tell me if it can do this;For aligning an old FM radio, the specified signal is 10.7Mhz FM, modulated with a 60hz sine wave, and 450khz sweep. Modulating the signal is no problem but I can’t figure out how to add the sweep into the mix. I know there is a sweep function available but it doesn’t appear to be available simultaneously with modulation.Edit: It might be better to share the instructions because the nomenclature does not translate well to the Rigol AWG menus.“Use frequency modulated signal with 60 (then there is a sinewave symbol) modulation and 450 khz sweep.” Then under Signal Generator Frequency it says “10.7Mhz (unmod.)”??The instructions don’t make sense to me as they call for modulation and unmod. in the same context. Either way, I don’t see a sweep setting available unless the Rigol “Deviation” is equivalent, but still no joy as 1khz is the max.Can someone educate me?Thanks,Jeff

author: thm_w
author_rank: Super Contributor
timestamp: November 17, 2022, 02:04:40 am
content: https://beyondmeasure.rigoltech.com/acton/attachment/1579/f-0905/0/-/-/-/-/MSO5_users_guide.pdfQuoteNo the manual is not that clear. But if it greys out when you turn on modulation then its not going to be possible.If its greyed out prior to that, could be some other setting you have.
EDU33212A generator stuck importing data file - Page 1
Forum section: electronics / testgear

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: November 16, 2022, 04:42:28 pm
content: I've previously imported csv files to this generator and after a few seconds, or a couple of minutes of the "importing data file..." message, I'm prompted to either load the newly produced arb file, or do something else. The generator supports up to 1Mpt per user arb file. Today I'm trying to import a file with 380k points to play a short sound clip, and it's been importing for over two hours now, but it still is somewhat responsive, at least bringing the display's brightness back to 100% after a button press. The longest it was stuck in that message before was about 10 minutes with 22k points file. I'm going to leave it on for now while i do some other things i need to do, but in the meantime I would like to know if anyone else has experienced such slow data imports on their waveform generators. Thank you!

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: November 16, 2022, 07:36:38 pm
content: almost 6 hours later! it definitely wasn't frozen but wow!what other waveform generators take so long to import data from a csv file with 300k points?
Amazon won’t deliver this meter to my address - Page 1
Forum section: electronics / testgear

author: iXod
author_rank: Frequent Contributor
timestamp: November 15, 2022, 01:39:32 pm
content: Any idea why a CO tester would be restricted to be delivered?Amazon is clueless. “There must be some restriction…”. Can’t tell me why.Thanks.

author: BILLPOD
author_rank: Frequent Contributor
timestamp: November 15, 2022, 01:58:35 pm
content: I've run into that 'Amazon can't deliver to your area', with a pair of magnifier eyeglasses. What makes it even more mysterious is that I am an Amazon Prime member, and buy things from Amazon all the time.

author: Stray Electron
author_rank: Super Contributor
timestamp: November 15, 2022, 02:06:54 pm
content: Are you buying the itemdirectfrom Amazon and is it being shipped by Amazon? My thinking is that somebody might be testing the market to how much demand there is and that they don't actually have the product for sale.Years ago it wasn't unusual for companies to advertise and product and sell thousands of them and collect the money and then use the money collected to go and build the item. That's why many ads used to say that deliver might take "up to sixteen weeks" or other disclaimers.

author: iXod
author_rank: Frequent Contributor
timestamp: November 15, 2022, 03:04:25 pm
content: Quote from: BILLPOD on November 15, 2022, 01:58:35 pmI too am a Prime member.Changed delivery address to nearby cities—and even tried another state—(in case it’s my municipality that asked Amazon to restrict this item for some reason): same “Can’t deliver” alert.

author: iXod
author_rank: Frequent Contributor
timestamp: November 15, 2022, 03:05:57 pm
content: Quote from: Stray Electron on November 15, 2022, 02:06:54 pmYes, From and By Amazon.

author: mwb1100
author_rank: Frequent Contributor
timestamp: November 15, 2022, 08:52:03 pm
content: For whatever reason, I get message like that when I try to buyClorox disposable "ToiletWand" scrubber pads. Other brands of similar products aren't a problem.QuoteI always figured it was some sort of restriction due to a chemical in those things. But maybe there's just some flag set by mistake in one of the zillion databases in one of Amazon's dark, dank basement server farms?

author: bdunham7
author_rank: Super Contributor
timestamp: November 15, 2022, 08:55:57 pm
content: Quote from: iXod on November 15, 2022, 01:39:32 pmCan you link it? And where are you?

author: thm_w
author_rank: Super Contributor
timestamp: November 15, 2022, 10:31:40 pm
content: A seller can decide not to ship to certain locations if they want.As bdunham7 says, you need to link the item in question.

author: LaurentR
author_rank: Frequent Contributor
timestamp: November 16, 2022, 12:15:47 am
content: If you are in California, there are all types of products that can't be sold there for various reasons. Unfortunately, the filter is not necessarily very accurate and some sellers take no risk. I never found a way to figure out for what reason they won't ship.Light bulbs, cleaning products, automotive products... you name it.When that happens, I always try to ship to Nevada and that tell me if it's a California issue.
sigrok an Rigol DS1000Z series: good and bad - Page 1
Forum section: electronics / testgear

author: DiTBho
author_rank: Super Contributor
timestamp: November 15, 2022, 10:56:44 am
content: So, Sigrok seems to have support for the Rigol DS1000Z series, seehere.Unfortunately I don't have a Rigol DSO on hands to verify.I would like to buy a DS1104Z (100MHz), but only if I can control it from an embedded linux board over ethernet.I need to dump two channels, as fast as possible.Feedbacks? Comments?

author: Fungus
author_rank: Super Contributor
timestamp: November 15, 2022, 02:06:24 pm
content: Just open an IP connection and send commands to it.https://www.rtelecom.net/userfiles/product_files_shared/Rigol/Oscilloscopes/MSO1000Z/DS1000Z_Programming%20Guide_EN.pdf

author: thm_w
author_rank: Super Contributor
timestamp: November 15, 2022, 10:37:31 pm
content: You might want to determine what "as fast as possible" is as a minimum requirement.It could be multiple seconds to complete over USB:https://www.eevblog.com/forum/testgear/ethernet-transfer-speed-for-rigol-ds2072a-and-ds4014/If faster data is required, look into picoscope or DScope, etc.

author: switchabl
author_rank: Frequent Contributor
timestamp: November 16, 2022, 12:09:20 am
content: I tried PulseView (which is based on Sigrok) with a DS1054Z a few months ago and it was not really usable. The timescale was wrong and changing the memory length didn't work. It is possible that this was a specific problem with my setup or that it has been fixed in the meantime.But of course, you could just control it directly using SCPI. If you just want to target one specific device using Sigrok is probably not worth it.
Stupid MSO4104 Question - Page 1
Forum section: electronics / testgear

author: daveyk
author_rank: Frequent Contributor
timestamp: November 14, 2022, 07:08:44 pm
content: I might being dumb, but I cannot find the answer in the manuals:When I remote control the MSO4104 with my software, some command is disabling the front panel controls and only some of the buttons work.It there a button to hold to regain local control? Right now, I have to power it off and back on to get the front panel controls to work again.I have to carefully trace through my program as one errant command may be corrupting the scope, but that's going to be a pain in the butt, but I am starting. I was wondering if anyone knows a button to be held in to regain menu control.

author: daveyk
author_rank: Frequent Contributor
timestamp: November 14, 2022, 07:35:40 pm
content: If anyone is interested with the programming of the Tek scopes, silly things like this:For the Tek TDS3000 series and TDS5404:strProg = "TRIG:A:EDG:SLO RIS" is the command to set the trigger to Channel two Rising edge.It also sends the MSO4104 in to lala land. The MSO4104 wants:strProg = "TRIG:A:EDGE:SLO RIS"That f'ing missing "E" causes it problems. Just about every other command from the TDS3000 series workes fine.I love this MSO4104 but it can be aggravating as hell at times. It's almost as it wasn't quite finished, marketed and sold and they never went back to fully clean up its code.

author: thm_w
author_rank: Super Contributor
timestamp: November 15, 2022, 12:35:17 am
content: https://download.tek.com/manual/MDO4000-MSO4000B-and-DPO4000B-Oscilloscope-Programmer-Manual.pdf"LOCk This command species the front panel lock state" ?

author: daveyk
author_rank: Frequent Contributor
timestamp: November 15, 2022, 04:13:47 pm
content: I did not try that, but thank you.Any front panel buttons to get out of a lock state? I'm not sure the front panel was locked but in some lala state. Some controls worked (knobs) but none of the buttons. I held everyone several seconds trying to regains control. I had to power cycle the scope to regain control.I think I found the command that was doing it and after adding that extra "E" the issue did not re-occur. For the future, I think I will add and LED control (great fokes on the Visual Basic forum wrote a wonderful new control for that) to my various programs just to add an indication of the panel lock.With some instruments, like the Agilent E3632A Power Supply, I have to Assert Remote control for full control to work. With the Tek Scopes, I do not do that and they work well. In fact, I don't think the assert remote command even works with them (I would have to review).The other tek scopes, if you send a bad command to them, they respond in kind, stating a bad command was sent. The MSO4104 does also, unless the command is damn close, then it just goes in to lala land - lol. Its brain locks as (as does mine when this happens).
RF Millivoltmeter questions - Page 1
Forum section: electronics / testgear

author: Crambone
author_rank: Frequent Contributor
timestamp: November 15, 2022, 04:01:10 pm
content: I acquired a MILLIVAC MV-823B-S1 RF Millivoltmeter and have a few questions.1) does anyone have any info on this unit? Instructions, schematic….?2) How can I verify that say 100mV RF is actually 100mV RF?Any help appreciated.
Pickup Coil for Frequency Counter - Page 1
Forum section: electronics / testgear

author: ko4nrbs
author_rank: Regular Contributor
timestamp: November 14, 2022, 10:32:53 pm
content: Wanted to use pickup coils with my Frequency Counter for different frequencies (80 thru 10-meter Ham Bands) but couldn't find anything on the web. Any suggestions on how to construct them?Bill
HP 98200A DC100 belts / Athana out of business? - Page 1
Forum section: electronics / testgear

author: Scrapcollector
author_rank: Newbie
timestamp: November 13, 2022, 04:24:52 pm
content: Dear readers,I was suprised that there was no search result in this forum about the topic.Question: Did anyone buy more replacement belts for their HP tapes than needed? Or found a working replacement from another drive belt manufacturer?The always ripped belt is exactly 24cm long 2mm wide and very thin (have to edit this in later). AccuPrint seems to have had some tapes, but replied: not anymore.Athana's website is so old and they did not respond to me yet that I have to suppose they're out of business.Why do I need them? I have the 8510B Operating System with TDR Option 010 on a set of two tapes, and wanted to send them to a HP computer collector (after baking the tape coating) who has working tape drives (I don't know who can do it yet) to save them. Otherwise I have to rely on the old eproms to last (didn't fire up the beast after it was sitting in some basement the last ~10 years), or get them out and copy them with the associated risk.If a source for the belts was avialable, it would theoretically be possible to wind music casette tape (both .15") back in to play around with the tape drive. The old tape, as you know, is too brittle. The question to solve before is, what kind of tape coating works. I remember reading on a label it being a 300(?) Oersted tape, but what kind of coating would that translate to in music casette industry - if this was referring to the coating or just the erasing field, I don't know.Some links:http://www.hp9825.com/html/dc100_tape.htmlHistoryhttps://www.hp9845.net/9845/tutorials/savetapes/index.htmlSave Tapeshttps://www.radioworld.com/industry/baking-magnetic-recording-tapeBaking Tapeshttps://community.keysight.com/s/question/0D52L00005Ie1xFSAR/8510b-operating-system-tapes8510B Operating System (apparently tied to serial number in case you wonder)https://patents.google.com/patent/US3692255A/enDC100 Patent (only mechanical, not referring to tape coating it seems)Best regards,SC
DSLogic U3Pro32 - Page 1
Forum section: electronics / testgear

author: slugrustle
author_rank: Frequent Contributor
timestamp: November 12, 2022, 11:42:55 pm
content: Does anyone on here have experiences with the DSLogic U3Pro32 logic analyzer that they'd be willing to share? I have a DSLogic Plus that works pretty well and am tempted to upgrade, but I would like to hear others' experiences first. There aren't very many reviews online.The product page is:https://www.dreamsourcelab.com/shop/logic-analyzer/dslogic-u3pro32/
LNA Amplifier gain - Page 1
Forum section: electronics / testgear

author: ko4nrbs
author_rank: Regular Contributor
timestamp: November 12, 2022, 03:00:45 pm
content: If using one of these with a Frequency Counter with a pickup coil how much gain would be needed? Unfortunately, the gain is not adjustable of these.Bill

author: _Wim_
author_rank: Super Contributor
timestamp: November 12, 2022, 03:26:23 pm
content: You can put multiple of these in series if gain is not enough. What are you trying to achieve exactly?

author: ko4nrbs
author_rank: Regular Contributor
timestamp: November 12, 2022, 04:01:26 pm
content: Quote from: _Wim_ on November 12, 2022, 03:26:23 pmJust want to be able to use a pickup coil on my Frequency Counter to read the frequency of the VFO externally.Bill

author: TimFox
author_rank: Super Contributor
timestamp: November 12, 2022, 05:29:37 pm
content: Do you have any estimate of how much voltage you will get from your search coil in this application?(I am sure none of us can estimate that for you.)If not, try one of these amplifiers and see how much you get from it to continue your design.

author: ko4nrbs
author_rank: Regular Contributor
timestamp: November 12, 2022, 06:49:48 pm
content: I may buy a few of them and test to see how much gain I will need.Thanks,Bill

author: ch_scr
author_rank: Frequent Contributor
timestamp: November 12, 2022, 08:16:07 pm
content: About 30dB(+-10dB) should be in the ballpark for a pickup coil? You could also check with a scope (with 50R termination on) how much signal you get "bare", then check the specs of your counter and go from there?
Applied Kilovolts module K9/70 and HP5/136 datasheet or pin-out - Page 1
Forum section: electronics / testgear

author: SPAZIONICA
author_rank: Newbie
timestamp: November 12, 2022, 04:46:07 pm
content: Hello Everyone,I'm looking for the datasheet or pin-out of 2 obsolete high voltage modules produced by APPLIED KILOVOLTS,these are the models:K9/70HP5/136I tried asking the manufacturer, but he told me they are obsolete,a few days ago I asked him which new models I can replace them with, and which pins I need to connectbut to date I have not gotten an answerI hope someone can help meThanks in advanceFrancesco
THS720 sytem error diagAcq_dspFifo - Page 1
Forum section: electronics / testgear

author: macfly
author_rank: Contributor
timestamp: November 12, 2022, 12:11:02 pm
content: Hello,I was gifted with a THS720 (no 'A') scope. So far, it seems to work, but it shows a 'power up fail' at startup.Taking a look into the error log, I found one repeating error, which seems to be there since a long period (see below).Firmware version is 1.03 from 1. sept. 1995.Can somebody please tell me, what are the consequences or what causes these error?Regards,macfly
GW INSTEK GDS-2074E oscilloscope hackable - Page 1
Forum section: electronics / testgear

author: ptluis
author_rank: Frequent Contributor
timestamp: November 10, 2022, 06:19:02 pm
content: Hello friends, is this oscilloscope hackable? model GDS-2074E from GW INSTEKI'm able to buy it used for 350€. Do you think it is still decent in 2022?Thank you

author: nctnico
author_rank: Super Contributor
timestamp: November 10, 2022, 07:50:12 pm
content: Yes and yes. You can hack this up to 300MHz but I recommend to stick to 200MHz. At 350 euro it is a no-brainer.

author: ptluis
author_rank: Frequent Contributor
timestamp: November 11, 2022, 11:10:28 am
content: thanks my friend
Continuity Tester Idea - Page 1
Forum section: electronics / testgear

author: PixieDust
author_rank: Frequent Contributor
timestamp: November 10, 2022, 03:53:13 am
content: Found this little nifty device on YouTube:Refer to video description for additional references.

author: Gyro
author_rank: Super Contributor
timestamp: November 10, 2022, 10:06:43 am
content: Its main problem is that it puts out a fair amount of voltage and current, enough to turn on semiconductor junctions and potentially damage the sensitive ones (and exceeds most IC protection diode limits). An ideal continuity tester should put out less than about 400mV max to avoid turning on Schottky junctions and with reasonably low test current.It's still possible to do this, and achieve <1R resolution by using a bridge circuit.

author: threephase
author_rank: Regular Contributor
timestamp: November 11, 2022, 10:50:28 am
content: Whilst I understand the comment, in the design criteria in the video, he stated that he wanted it to test LEDs and diodes, which I presume is why he opted for a higher test voltage and current. Even at the test voltage it operates at, it might not be able to test all LEDs.I do find it a good video, well explained in how he built the design up.
Help with Symmetricom DTI Signal Generator - Page 1
Forum section: electronics / testgear

author: sinuspl
author_rank: Newbie
timestamp: November 09, 2022, 06:18:51 pm
content: Hello fellows!Bought an Symmetricom DTI Signal Generator via eBay, has X72 Rubidium Standard inside and serial (RS-232) interface on the front side. Can't set any good parameters in terminal to view and write text. Have tried all speeds, 8 bits, 7 bits, stop bits, etc. Nothing works. Seems to use binary format? Has someone seen and/or configured this unit before?Please help, want to correct the frequency, is slightly off by 6mHz to GPSDO.best regardsGregor

author: sinuspl
author_rank: Newbie
timestamp: November 10, 2022, 10:52:03 pm
content: More info: this is a DOCSIS timinig generator, but has 10MHz ref in and out. It seems, that the rubidium oscillator is not connected to the ref in. There is a CPU inside, connected to all other parts, also to the X72 via serial.I think I could input 1PPS from the GPSDO and feed it directly into X72. Also could re-wire the front serial connector directly to the X72 module.best regardsGregor
3D print model for HP 8563e spectrum analyzer handle pivot covers? - Page 1
Forum section: electronics / testgear

author: E63S4Me
author_rank: Contributor
timestamp: November 12, 2022, 12:55:43 am
content: Hi All,I have an HP 8563e that I purchased used which works great but needs new covers for the handle pivots. Right now the pivots are naked and work fine, but I would like to cover them up with something resembling the factory pieces.Before I take the time to design and print my own I thought I would reach out and see if anyone knows of an existing model in the public domain.Thanks!
Beckman Industrial PPS1000 Power Supply - seeking service / ops docs - Page 1
Forum section: electronics / testgear

author: ChuckDarwin
author_rank: Regular Contributor
timestamp: November 09, 2022, 07:54:13 pm
content: Cleaning off more "someday" shelf space. Beckman Industrial power supply PPS1000 (from 1989+). Hefty 40+ kg unit (18x18x18cm transformer), 60VDC, 16-17 amps, GPIB. Was marked "no output" which turned out to be mechanical issues -- stuck output enable relay and loose connections. Snugged things up and got all 10 relays (9 tap, 1 output) responding, presently cleaning off very heavy flux deposits on relay board. Could use some adjustment to bring the reported and actual output values closer together if possible, off by some 10ths, not big. Transformer is under the brown board at left, relay board at top, controller/logic at centre. Board mfr was kind enough to grind off many of the chip identifiers and ROM dump wasn't useful.Basic operation is easy enough to determine, but I would like to locate a service manual for adjustments and possibly an an ops manual for completeness. If anyone has this unit, any tips to pass on? Internet & archive, arteck, boat anchor, bitsavers and an image search only turned up a data sheet. One GP PPS series manual on ebay for $50 (nope). The main logic board is from Lumen Electronics 1989 and I expect this is a rebrand or generic design--haven't found something similar under a different brand yet. There are several smaller models in this series PPS600, 100.
Frequency Counter Buffer Project - Page 1
Forum section: electronics / testgear

author: ko4nrbs
author_rank: Regular Contributor
timestamp: November 09, 2022, 02:32:28 pm
content: Has anyone built this?https://www.nutsvolts.com/magazine/article/build-an-rf-frequency-counter-buffer-for-hfThanks,Bill

author: nctnico
author_rank: Super Contributor
timestamp: November 09, 2022, 02:52:22 pm
content: Wouldn't a standard 1:100 oscilloscope probe with a BNC adapter do the trick?

author: ko4nrbs
author_rank: Regular Contributor
timestamp: November 09, 2022, 02:57:27 pm
content: Quote from: nctnico on November 09, 2022, 02:52:22 pmYes. Wanted something I can use to monitor the VFO frequency of my old AM transmitter while operating. I have used a commercial demodulator and sampler to view the transmitters output while modulating the output.Bill

author: mag_therm
author_rank: Frequent Contributor
timestamp: November 09, 2022, 03:32:01 pm
content: I made a buffer from vintage sw receiver vfo to a PLJ_0802-C frequency display (with IF Offsets).It is just a FET- Bipolar HiZ to 50 Ohm with a RG 174 coax to the display in another chassis.input level 50 to 200 mV.

author: ko4nrbs
author_rank: Regular Contributor
timestamp: November 09, 2022, 04:48:03 pm
content: Quote from: mag_therm on November 09, 2022, 03:32:01 pmWhich FET- Bipolar HiZ did you use?Bill

author: mag_therm
author_rank: Frequent Contributor
timestamp: November 09, 2022, 05:16:50 pm
content: Quote from: ko4nrbs on November 09, 2022, 04:48:03 pmHome-brew 2n4416 into a 2n3904 as emitter followerEdit :Fet_Bi_Buffer qucs circuit with bias voltages:https://app.box.com/s/74j8faqyjbk1xsjudkw7ngy9s4q5jnyi