hybridfree/eevblog-posts huggingface dataset:
SOLVED: SDS2202X-E 350MHz hack not working anymore? - Page 1
Forum section: electronics / testgear

author: nicolad
author_rank: Newbie
timestamp: January 13, 2024, 01:17:59 pm
content: Hi,I recently bought a new Siglent SDS2202X-E scope. Using the scripthttps://replit.com/@wgoeo/siglent-keygen scriptI successfully installed all the available options...But when I try to upgrade the bandwidth to 350MHz something goes wrong and the device enters an "unknown" status showing an empty Instrument Model, Serial Number and Software Version. After restarting the scope, I'm able to revert back to the 200MHz model using the MCBD string generated by the script (so, I can tell the script is working properly)...Is it possible that some measures to prevent upgrades have been introduced? I tried to downgrade the firmware to version 1.1.19R5 but still the unlock was unsuccessful...Do you have any advice?Thank you!

author: nicolad
author_rank: Newbie
timestamp: January 13, 2024, 01:24:03 pm
content: Ok, looks like that I should have used the MCBD key from the 300MHz line and NOT the one on the 350MHz line... Even though the upgrade is to 350MHz...

author: tautech
author_rank: Super Contributor
timestamp: January 13, 2024, 01:34:06 pm
content: Quote from: nicolad on January 13, 2024, 01:24:03 pmExactly this ^^^Yes a trap for the unwary.
sigrok - Getting started questions - nightly vs. release questions - Page 1
Forum section: electronics / testgear

author: NickyDoes
author_rank: Contributor
timestamp: January 13, 2024, 01:52:18 pm
content: I'm using the ubiquitous 8 ch, 24 MHz logic analyzer with sigrok on Windows. Only the 0.4.2 64-bit release captures data. My steps to reproduce:1. Install PulseView (sigrok) release (0.4.2 64-bit) on Windows 11.2. Plug in the super cheap logic analyzer.3. Run Zadig. Select the new 'unknown device' and install the WinUSB driver.4. Run PulseView.5. Choose 'Run'6. Observe data (I'm using this nice sketchhttps://github.com/quirxi/arduinoLogicAnalyzerTestto generate some data).Now, with the nightly release:1. Uninstall PulseView 0.4.2.2. Install PulseView nightly (0.5.0-git-105ecff)3. Run PulseView.4. Choose 'Run'5. Observe no data.Note: In both cases the device dropdown shows the same logic analyzer.I'm developing a protocol decoder for Renesas' ZMID4200 and similar one-wire interface, so I'd like to be as current as possible on sigrok. Yes, I could just use 0.4.2. I would like to participate in finding the problem and fixing it.

author: mwb1100
author_rank: Frequent Contributor
timestamp: January 13, 2024, 05:07:35 pm
content: I'm by no means knowledgeable about sigrok/pulseview, but thepulseview manualmentions a command line option (--loglevel) that enables debug logging. I'd start by setting that to 4 or 5 with both versions of the software and see what's different.
Wanted Leader LSG-231 - Page 1
Forum section: electronics / testgear

author: DGSanders
author_rank: Newbie
timestamp: January 12, 2024, 09:07:43 pm
content: I am looking for a Leader LSG-231 FM Stereo Signal Generator in working condition.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: January 12, 2024, 09:15:53 pm
content: If you wanna by something with a "wanted" headline, maybe you should give it a shot from the bow in the appropriate forum section called "wanted"https://www.eevblog.com/forum/buysellwanted/
Vintage Oscilloscopes need repair - Page 1
Forum section: electronics / testgear

author: GIORGIOEEV
author_rank: Newbie
timestamp: January 12, 2024, 04:36:10 pm
content: Hello,I leave near Vancouver and own 3 vintage Tektronix oscilloscopesthat would need repair. Would you know of anyone around Vancouverwho could help? I have two of Type 503 and one Type 564 scopes. Thank you.Kind regards,Giorgio
Juntek JDS6600 signal generator - Page 1
Forum section: electronics / testgear

author: MarkMLl
author_rank: Frequent Contributor
timestamp: November 09, 2022, 01:51:28 pm
content: I've put some time over the last few days writing a control program for this to run under Linux, output functions are now OK although I've yet to do a waveform editor.I cannot get it to either measure or count the signal on the "Ext. IN" connector. I sometimes see the counter flickering between 0 and 1, but it refuses to make any effort to go beyond that or report voltages etc.Has anybody actually got this working reliably, and if so what "special magic" is involved?I know that various people have reported failures on the output channels, but fortunately those appear OK since they're what I actually want (subject obviously to the capabilities of an instrument this cheap).MarkMLl

author: MarkMLl
author_rank: Frequent Contributor
timestamp: November 09, 2022, 08:03:12 pm
content: Answering my own question: you need a separate signal source (don't expect to be able to use one of the instrument's own outputs) and this needs to have an adequate voltage swing (an Arduino is fine, a 'scope's 1V calibration signal isn't).I hope to have Linux console and GUI (GTK2) programs on Github in a few days time.MarkMLl

author: snickers
author_rank: Contributor
timestamp: November 26, 2023, 07:58:24 pm
content: I'v made GPSDO for this generator and testing it.Since we have no access to "magic" tuning menu to eliminate internal offset of manufacturer it is needed to fine "tune" 24.0MHz reference.

author: MarkMLl
author_rank: Frequent Contributor
timestamp: November 30, 2023, 03:13:15 pm
content: Thanks for letting us know what you were doing, it's always interesting.I got as far as having software control of sweep+pulse so that a scope could get a reference. That was useful to allow me to tune a ferrite frontend, but I didn't get much more work done on the software, in particular no waveform editor.MarkMLl
How good is a Hantek DSO 8060 compared to other cheap hand held scopes? - Page 1
Forum section: electronics / testgear

author: Guy1000
author_rank: Newbie
timestamp: January 11, 2024, 01:01:27 am
content: I have been looking for a decent budget scope for a while and a Hantek DSO 8060 popped up recently for $300 CAD. I looked around and couldn't find any recent reviews for the scope. I was wondering if this is a good price and if it is worth it over something like a Hantek 2D72 which is much cheaper. I don't plan on doing anything too crazy, just need something good enough for a hobbyist. Thanks

author: coromonadalix
author_rank: Super Contributor
timestamp: January 11, 2024, 02:33:11 am
content: it's declared discontinued on Hantek sitenot sure i would buy theses, no further support of FW upgrades, you'll have to live with it ... i would choose the 8060, way over the otheri would not even compare them at allif you snatch a very good 8060 at low price ... but can you do some tests on it before purchase ??

author: Aldo22
author_rank: Super Contributor
timestamp: January 11, 2024, 11:57:41 am
content: It is difficult to compare.First of all, it wouldn't be a handheld for my hand, at 24.5cm x 16.3cm and 1.2 kg.Then it's probably been on the market for 13 or 14 years and as coromonadalix said, it's discontinued.Then it depends on what you mean by "decent budget scope". 250 MSA/s and 60MHz are not exactly outstanding these days.If I wouldn't really need it in the field, for this price I would buy a benchtop scope and a separate multimeter, which doesn't take up much more space.If you are looking for a mobile scopemeter, there is e.g. Owon HDS2202S for about the same price.https://www.owon.com.hk/products_owon_hds200_series_digital_oscilloscopeBut yes, apparently there are fans of this Hantek Model:https://youtu.be/TkMj3aZyPek

author: csuhi17
author_rank: Frequent Contributor
timestamp: January 11, 2024, 03:14:21 pm
content: The Owon HDS series is very limited, at least in terms of function.I think the HDS2202 is a bit overpriced.Have you looked at the OWON TAO3074?Or if you need a combined one, then TAO3072.
Searching for Hitachi VC-6050 oscilloscope manual - Page 1
Forum section: electronics / testgear

author: cyberfuzzy
author_rank: Contributor
timestamp: September 21, 2018, 08:44:12 am
content: Hi,I bought a Hitachi VC-6050. It is a nice vintage oscilloscope. Everything works fine but it needs to be calibrated. I can't find a manual for it online. I would like to have- an owner's manual / operation manual- a service manual with calibration procedure- schematicsI found this thread with a file called "VC-6050-Operation_Manual.pdf", but the link is down.http://www.edaboard.co.uk/hitachi-oscilloscope-operation-manual-found-t261938.htmlThe site is still there on archive.org but the PDF is not saved:https://web.archive.org/web/20040607001247/http://www.hdeg.tzo.com:80/004%20%20%20%20%20%20%20%20%20OscilloscopesCan anybody help me?

author: selcuk
author_rank: Frequent Contributor
timestamp: January 11, 2024, 09:00:13 am
content: I bet you've already found the operation manual. These may help others looking for it.
8591A Display do not work - Page 1
Forum section: electronics / testgear

author: BenKarNeu
author_rank: Newbie
timestamp: January 10, 2024, 05:00:08 pm
content: Hello Community,my dad gave me an HP 8591A.One to the other day the display do not work.But if you turn of the device, the display lights shortly and then powers off.I checked the voltages an they are OK.Does anyone know what the problem could be?
Sencore probe wiring diagrams for 39G235, 39G236, 39G298, 39G299 - Page 1
Forum section: electronics / testgear

author: cmulcihy
author_rank: Newbie
timestamp: May 12, 2023, 05:45:23 am
content: Looking for help with a wiring diagram for 4 different Sencore probes, for 2 different pieces of Sencore test equipment.First one is a Sencore VC93 all format VCR analyzer, need wiring diagrams for1. Performance Test Lead, part number 39G2352. Servo Troubleshooting Test Lead, part number 39G236The front of the VC93 has one female plug for these 2 test probes, can only plug in one probe at a time. The plug has 5 inputs and a ground. Each test lead uses 2 inputs and ground. Therefore, there may be a left over, unused input on the front of the machine. Have studied the schematics, and the labels do not adequately provide enough information to unravel the mystery of how these two test probes are wired.Second test equipment is Sencore TVA92 TV Video Analyzer, need wiring diagrams for1. Ringer/Load Test Leads, part number 39G2982. Dynamic Test Leads, part number 39G299Any help, especially with the VC93 probes would be very appreciated. Plan to use this equipment to maintain VCR’s for archiving video tapes.

author: KG7AMV
author_rank: Frequent Contributor
timestamp: January 09, 2024, 08:12:15 pm
content: I seek also..
Capturing pulse sequences across multiple channels on an Siglent SDS6000A scope - Page 1
Forum section: electronics / testgear

author: Lateralleap
author_rank: Newbie
timestamp: January 08, 2024, 04:50:29 pm
content: Hi,Apologies in advance if this is a very basic questionOn a Siglent SDS6000A scope. I understand how one can use Sequence mode to capture a specified number of pulses on one channelHowever what I want to do is use pulses on one channel as the trigger event to capture pulses on two other channels as well so that I can review their relative timingCan this be done with Sequence mode of should I just set the memory depth very low and use normal History mode to revew the pulses across the three channels?Thanks

author: rf-loop
author_rank: Super Contributor
timestamp: January 09, 2024, 04:38:48 am
content: Quote from: Lateralleap on January 08, 2024, 04:50:29 pmIn sequence mode, all active channels are stored in the memory simultaneously in time with the trig channel. So you can observe and measure their relative timing (just like in normal operation).Of course, for full time resolution it requires that the detail to be compared on the time scale of each channel is located in the same segment.The time correlation between channels can also be checked across segments because each segment has a time stamp. However, the resolution of the timestamp is only 1us.In addition, the condition is that the comparable details are not located in the blind time between the segments.When comparable events occur in the same segment, full-time resolution is naturally available.

author: Lateralleap
author_rank: Newbie
timestamp: January 09, 2024, 11:22:14 am
content: rf-loop,Thank-you so much for this!!!All of the example videos I watched on Sequence mode only showed one channel being recorded so I (wrongly) assumed that's all one could doMuch appreciated :-)

author: rf-loop
author_rank: Super Contributor
timestamp: January 09, 2024, 04:08:27 pm
content: This is not SDS6000A but Sequence works same (in all Siglent models where is this feature, same principle)Also I have used SDS6000 other version so I also know it instead of only believing.Here very simplistic example.I take single shot 5000 segment sequence. (in this case I use it in single shot mode)image a1After 5000 segments captured it have stopped and all segments are stacked to this image after sequence ready and processed for image. But because repetitive signal they are overlaid.If there is some anomaly in some individual segments it can also see here. But here not anomalies, just continuous signals from generator..image a2I want go to history for look these individual segmentsimage a3Individual segment (no 4995)Here in history can of course use automatic measurements, math, cursors... even serial decode.And in history data is real ADC data... there can also change interpolation and also look only sample dots if want.Siglent save full data to segments, just same as in normal oscilloscope use.Time stamps can look in delta time or real time mode.Also there can use full window pan and zoom and split window zoom when look segments in History.
Yokogawa WT1030M Digital Power Meter - Page 1
Forum section: electronics / testgear

author: zener
author_rank: Contributor
timestamp: December 19, 2023, 11:58:48 am
content: I picked up this 3 phase power meter, which seems to work OK. I have taken pictures of all the boards and copied the EPROM's. The manual is available on the Yokogawa website. I want to try using the GPIB interface. If anyone in interested in any of the images or photos, let me know.

author: zener
author_rank: Contributor
timestamp: December 19, 2023, 07:06:32 pm
content: My goal with this device is to build a single phase to 3 phase converter. A necessary part of that is to tune the capacitors to balance the generated phase. That is tricky, and this should help.

author: coppice
author_rank: Super Contributor
timestamp: December 19, 2023, 07:22:01 pm
content: Interesting. I've never seen a Yokogawa power meter with a printer in it before. What sort of things can you print with it?

author: zener
author_rank: Contributor
timestamp: December 19, 2023, 07:35:06 pm
content: I don't know what I can print, and I don't know if the printer even works. Without the front door, the paper would not even stay in place. I just picked the unit up, and so I have not done much with it other than my usual collect all the information that I can about it.

author: aeg
author_rank: Regular Contributor
timestamp: January 08, 2024, 09:10:54 am
content: I have this unit's cousin, a WT2010. Here is a sample printout from a few years ago when I was measuring a power supply's no-load consumption. It prints whatever you have selected on each of the displays.
Rare Philips PM9267 data hold probe - Page 1
Forum section: electronics / testgear

author: Nexrem
author_rank: Newbie
timestamp: January 07, 2024, 08:13:49 pm
content: Hey, new around here.Recently I obtained a Rare Philips PM9267 data hold probe. There is practically no information on it anywhere on the internet. There is one seller selling it for 169 EUR (which is quite exorbitant). I got mine for < 15 EUR from some nice elderly person here in Bulgaria who was happy it was going to a new home.I have a Philips PM2534 DMM that's compatible with it. It works well. Since there is practically no info about these I thought I'd post pictures and maybe ask some questions as I'm not sure what one of the indicators does.When connected to the DMM you can make any measurement using the Volt/Ohm input. This means you can measure resistance, AC and DC volts and caps. Pressing the button toggles the LED on the probe and "holds" whatever value on the display on the DMM.There is a ground passthrough on the plug to the DMM as well as a single pin sticking out on the front of the probe marked "0". This is connected directly to ground and is used to connect for example a local crocodile clip or another probe for ease of use.The probe has really nice build quality and is great to use. However I still havent figured out what the = speaker icon is for. I thought it was some continuity tester but it doesn't do anything. I thought maybe it lights up when the value being hold "equals" another measured value for quickly probing relative grounds for example, but it doesnt seem to be that either. Maybe my DMM doesn't have this feature?

author: AVGresponding
author_rank: Super Contributor
timestamp: January 08, 2024, 06:27:29 am
content: I'd have guessed it's a visual continuity indicator. I'd further guess that if it doesn't light when it should, that it has been popped by someone applying too many angry pixies...
Has anyone heard of Kokusai test equipment? - Page 1
Forum section: electronics / testgear

author: johntitor
author_rank: Newbie
timestamp: January 08, 2024, 01:27:33 am
content: Went to an estate sale and got this counter solely because of the tubes, but I can't seem to find information about their test equipment besides the odd ebay post. Looks like they mostly make semiconductor manufacturing equipment. Any help?Edit: BTW. The model number is HR-3131

author: damien
author_rank: Contributor
timestamp: January 08, 2024, 01:52:41 am
content: Looks like this is their website:http://digitro.jp/At least there's an email address.A quick check on Yahoo Auction (Japan) did not return any hit :-(

author: salvagedcircuitry
author_rank: Regular Contributor
timestamp: January 08, 2024, 06:11:21 am
content: The front panel alone is worthy of shelf space in my labNice score.

author: pickle9000
author_rank: Super Contributor
timestamp: January 08, 2024, 06:27:55 am
content: Wow, nice
FNB58 reboots - Page 1
Forum section: electronics / testgear

author: PlainName
author_rank: Super Contributor
timestamp: January 07, 2024, 04:31:02 pm
content: Had a chance to try this now to my Nothing (which is allegedly 33W capable). I'm using a GMM 120W charger and typically get 24W as shown on a cheapo USB cable-with-display. Insert the FNB58 into the chain and after an initial restart when the phone is attached, it goes as expected: climbs to 24W and stays there.Then I unplug the phone and the FNB58 show no current but 9V still. Plug the phone in and I get about 3W for a short while, then the FNB58 reboots and comes back up showing 5V, 10W. After a few seconds, the voltage drops to 4.7V and then the FNB58 reboots and repeats the 5V, 10W, reboot thing. Seemingly forever.If I disconnect and reconnect the charge the same thing happens (the FNB58 sucks power from the phone in that case). The only way out is to disconnect everything and start again from scratch.I tried connecting a second power source to the micro-B (PC) connector, and that prevented the initial reboot-on-connect, but on disconnecting and reconnecting the phone it went back into the 5V, 10W, reboot loop.With the FNB58 out of circuit, no problem: phone always ends up at 24W.Is this normal behaviour for the FNB58 or do I have a borked one?[Edit: added video]

author: electr_peter
author_rank: Unknown
timestamp: January 07, 2024, 10:10:22 pm
content: Is "PD COM" switch on FNB58 set to ON or OFF? It should be in OFF position for it to be transparent to USB negotiation. If it is ON, it can interfere.

author: PlainName
author_rank: Super Contributor
timestamp: January 07, 2024, 10:41:03 pm
content: I don't have (or can't find) a PC COM switch. Settings-wise, it's factory defaults.

author: Kean
author_rank: Unknown
timestamp: January 07, 2024, 10:44:26 pm
content: Quote from: PlainName on January 07, 2024, 10:41:03 pmThe "PD COM" switch is on the front edge to the right of the Type-C connectors.

author: PlainName
author_rank: Super Contributor
timestamp: January 07, 2024, 11:00:56 pm
content: Duh! Yes, it was set to ON. Changed to OFF and appears to be OK now.Thanks very much. Don't know how I missed that - after electr_peter's post I checked all 6 sides of the thing and still missed it

author: Kean
author_rank: Unknown
timestamp: January 07, 2024, 11:06:44 pm
content: This is useful to know. I only just got mine, and have only had a quick play so far.
Marconi 6204B, 10 MHz - 46 GHz, Scalar network analyzer - Page 1
Forum section: electronics / testgear

author: mattko
author_rank: Contributor
timestamp: January 09, 2024, 11:33:21 am
content: Hi all,our lab has this piece of equipment, but we don't really need it. Does anybody know if this kind of equipment is still useful for somebody? On ebay it is priced at around 4000 $. It comes without power sensor.Useful links:https://www.testequipmenthq.com/datasheets/Aeroflex-IFR-Marconi-6204B-Datasheet.pdfhttps://www.testequipmenthq.com/datasheets/Aeroflex-IFR-Marconi-6230-Datasheet.pdf
HP 5359A - VCO drift issue? - Page 1
Forum section: electronics / testgear

author: Raindog
author_rank: Contributor
timestamp: January 07, 2024, 02:59:40 am
content: I have a HP 5359A Time Synthesizer that I'm not sure if I am having an issue with or not. I can set a pulse width, period and when observed on an oscilloscope the pulse train seems fine. But when measured on a frequency counter the pulse train frequency drifts +/- 200-300 Hz, pressing the "CAL" button sometimes fixes it but begins to drift after a few seconds. Changing the pulse to a symmetrical or near symmetrical shape seems to fix the issue. The service manual suggests performing the realignment procedure for the multiplier and VCO boards. However I have done this procedure only to see little to no improvement, even swapped out the VCO board for another and also saw no improvement. Any ideas?Best Regards,Craig Petersen.

author: trukresom
author_rank: Contributor
timestamp: January 07, 2024, 10:35:40 am
content: I also have a HP5359A here and it shows the same behavior as you describe.When reading the article in the HP-Journal (August 1978, page 12) carefully,there are 2 circuits providing precise timing, one used for a delay between syncoutput to delayed output and the other for the pulse width.I did'nt found any specification of the precision of the output frequency.But Your question was also subject to a discussion on the time-nuts forum:https://www.febo.com/pipermail/time-nuts/2008-June/031885.htmlhttps://www.febo.com/pipermail/time-nuts/2008-June/031889.htmlhttps://www.febo.com/pipermail/time-nuts/2008-June/031890.htmlhttps://www.febo.com/pipermail/time-nuts/2008-June/031893.html

author: Raindog
author_rank: Contributor
timestamp: January 07, 2024, 05:21:44 pm
content: Thanks for the links to timenuts, I thought I was going crazy or there was something wrong with the unit. After posting this I did a deeper dive on the timing of the pulses with my HP 5371A. What I found is that the pulse width and spacing are within 70-100pS, 120pS worst case (over a 1000 pulse sample) regardless of the variances I am observing in pulse train frequency. After reading the "theory of operation" in the service manual I became suspicious that the unit was only intended to generate precise pulse widths, delays but not continuous pulse trains, this also explains why pulse train frequency accuracy improves with a wider pulse width. Reading the responses at timenuts verified that there was nothing wrong with this instrument, very interesting reading.Best Regards,Craig Petersen.
OWON VDS6102A USB Oscilloscope Software for Linux? - Page 1
Forum section: electronics / testgear

author: Silver_Is_Money
author_rank: Regular Contributor
timestamp: January 07, 2024, 04:44:08 pm
content: Is there software (either aftermarket or official) for running the OWON VDS6102A USB DSO (Oscilloscope) in Linux?I see (and have installed) such software for the similar but less capable OWAN VDS1022, so I'm hoping the same exists for the higher end VDS6102A.
Electronic Load Maynuo M9812B - Understanding Soft Start CV Mode - Page 1
Forum section: electronics / testgear

author: kloetpatra
author_rank: Regular Contributor
timestamp: January 06, 2024, 09:33:11 pm
content: Today I wanted to try theSoft Start CV Modeof myMaynuo M9812BElectronic Load in believe that it would be more gentle for the power supply.However when looking at the scope you can see that after turning on the load it first acts as a dead short and then ramps up the voltage until hitting the CV limit.Is my understanding wrong, or did Maynuo implement this function incorrectly (maybe copied from CC mode)?A part from theManualsays:QuoteBut the graph is clearly starting from 0 volts and the word "rise time" is reflecting my observation. So for the power supply it results in a current spike.How should this function avoid "current strike damage" then. Shouldn't it start as "open circuit" and ramp down?What is the correct use case if my understanding is wrong?If I do not use the Soft Start it ramps down to Vconstlimit instantly. So this is not a load regulation problem of the power supply or a bug in general.Shouldn't matter, but my settings were:Power supply: Vset= 12 V, Iset= 500 mAElectronic load: Vconst= 5 V, Trise= 10 s

author: H.O
author_rank: Frequent Contributor
timestamp: January 07, 2024, 08:24:59 am
content: I think it's implemented correctly.It says that it acts as a condensive load which is a load where the current leads the voltage. It's like connecting a discharged capacitor across the power supply (though the voltage would not rise linearely).CV softstart will start short circuit and gradually decrease the load current until the set voltage is met.CC softstart will start open circuit and gradually increase the load current until the set current is met.EDIT: I have not tried this but perhaps it's possible to "combine" the CC softstart and CC+CV modes.
A question for Tautech - Page 1
Forum section: electronics / testgear

author: watchmaker
author_rank: Unknown
timestamp: January 07, 2024, 12:32:40 am
content: I asked about this in the sandbox (Beginners): it is about the Siglent vs. and Analog in displaying sweeps.The post is linked below. A video of the traces and a description of the setup is in that post.The issue is that the Siglent seems to have trouble with two channels of sweeps whereas the analog does not. It almost looks like it runs out of processing power. I hit upon a workaround (trigger on one channel then the other) but that is not particularly elegant.How should this be set up? Or, is it a limitation? BTW, I have no idea why this is a practical use. I was playing around.https://www.eevblog.com/forum/beginners/analog-vs-digital-a-newbie-scope-question/msg5263527/#msg5263527THANKS!
Programming the Analog Discovery (3) - Page 1
Forum section: electronics / testgear

author: luky315
author_rank: Regular Contributor
timestamp: January 05, 2024, 01:04:36 pm
content: I have a basic question regarding the Analog Discovery: I'm using it as a scope and also a frequency generator and I'm very happy with the performance and the price. But for a different project (ATE for burning in a small batch of measurement devices) i need a few things that in principle the Analog Discovery is capable of, but I don't know the "easiest" way to access it:First I need a clock signal that is syncronized to the ADC sampling clock (125MHz if I'm not mistaken). Preferably it would be divided by 16 or 32 (should be in the range of a few MHz) but that can be done externally.Then i need a ramp from 0 up until an input becomes high (<2.8V). The ramp speed is not that critical, i have a delay of 50µs from the input of the DUT to the digital output of the DUT so a higher speed is not desiderable anyways.Then I need to set 12 digital IOs to the new state for the next cycle, get an average value of the ADC measurements and the DAC value on which the input switched.Then the cycle should start again with the ramp starting at 0V.So my question is if and how can I program or control the Analog Discovery to make such measurements?

author: egonotto
author_rank: Super Contributor
timestamp: January 05, 2024, 09:42:36 pm
content: Hello,Perhaps the forumhttps://forum.digilentinc.com/can help.Best regardsegonotto
Hioki ST5520 Unboxing and mini Teardown - Page 1
Forum section: electronics / testgear

author: gamalot
author_rank: Super Contributor
timestamp: January 04, 2024, 10:58:32 am
content: My first toy in 2024, a brand new Hioki ST5520 insulation meter.

author: gamalot
author_rank: Super Contributor
timestamp: January 04, 2024, 11:01:46 am
content: more pictures ...

author: mawyatt
author_rank: Super Contributor
timestamp: January 04, 2024, 06:03:06 pm
content: Nice, gotta love these Hioki Instruments!!Great images too, nice rendering, what camera & lens?What current is used on the lowest ohms scale?Best,

author: gamalot
author_rank: Super Contributor
timestamp: January 04, 2024, 07:41:47 pm
content: Quote from: mawyatt on January 04, 2024, 06:03:06 pmThank you so much!The camera is an Olympus E-M5 Mark 3, for the lens, I always prefer the 60mm/F2.8 macro whenever possible.I don't really understand what you mean by "lowest ohms scale" (I'm not a native English speaker). If it refers to the RM3545, its maximum test current is 1 amp (DC).
Siglent SVA1015X input N terminals hot to the touch - Page 1
Forum section: electronics / testgear

author: spacehen
author_rank: Contributor
timestamp: January 04, 2024, 02:34:37 pm
content: Just as the title states.I have a Siglent SVA1015X spec & VNA and I've noticed that the N-type connectors become quite warm after about 30-45 minutes andwould describe them as hot to the touch but not too hot to touch.I've noticed that my rigol DSA815 input connectors also get warm but not as hot as the siglent. There is virtually no info about this in the manuals or onlinethat I could find.What's exactly going on? Am I just being a noob and this is normal??Do they use the ground plane as some sort of heatsink?

author: rf-loop
author_rank: Super Contributor
timestamp: January 05, 2024, 05:33:47 am
content: Quote from: spacehen on January 04, 2024, 02:34:37 pmNormal.Yes of course.
Teardown with pictures of Voltcraft IT-1500 isolation transformer - Page 1
Forum section: electronics / testgear

author: jero32
author_rank: Newbie
timestamp: January 07, 2024, 07:01:42 pm
content: Hello,I tore down the Voltcraft IT-1500 isolation transformer I just received and took some pictures. I figured people here might appreciate them.https://imgur.com/a/W0isYG9(Files too large to upload directly to forum)What I find curious is that they used an unearthed plug for the input to the transformer. Now here in the Netherlands (and I assume Germany) it's not uncommon to find older houses with ungrounded sockets that you can plug earthed schuko connectors into. So perhaps this is up to code. Anyone know if there's a reason they would omit an earth? If not I might add one myself.The output not having an earth connection seems to be a topic of hot debate when it comes to isolation transformers so at least that makes sense.edit: It's hard to see in the pics I took and I forgot to explicitly mention. The output does not have earth prongs.

author: jero32
author_rank: Newbie
timestamp: January 07, 2024, 08:17:04 pm
content: Update: tried using it. It keeps consistently tripping my breaker with inrush current. I've seen this before with my studio monitors if I start them up both at the same time.Pondering whether to return it or if I should add some inrush current limiting.

author: cte
author_rank: Regular Contributor
timestamp: January 07, 2024, 09:37:24 pm
content: Quote from: jero32 on January 07, 2024, 07:01:42 pmIt is rated "Class II" or "double insulated". ⇒https://en.wikipedia.org/wiki/Appliance_classes#Class_IIQuote from: jero32 on January 07, 2024, 07:01:42 pmAt 1500 VA I would expect a startup circuit to be included, but from the photos it doesn't seem so.

author: jero32
author_rank: Newbie
timestamp: January 07, 2024, 10:25:21 pm
content: Quote from: cte on January 07, 2024, 09:37:24 pmDouble insulation rating makes sense. Would this actually meet such specification though? In the photos you can see there is a piece of exposed Live and Neutral wire near where the wires enter the case. Of course due their position them touching the case is unlikely but still.The transformer is also sitting on top of the metal chassis.Lack of inrush current is disappointing indeed, but perhaps for the price I can't complain too much. I might have to add my own.
Artek Manuals for HP 8640B-opt323 and HP 3456B unavailable - Page 1
Forum section: electronics / testgear

author: tatel
author_rank: Frequent Contributor
timestamp: January 04, 2024, 06:19:46 pm
content: Hi all.Unfortunately I have to say Artek Manuals for signal generator HP 8640B-opt 323 (military version) and DMM HP3456A are unavailable. I have been told they were stored in some non-usual place and the widow can't find them. For reference, you can see this threadhttps://www.eevblog.com/forum/testgear/is-artek-manuals-working-hp-8640b-opt-323-manual/msg4916323/#msg4916323I asked that very nice and righteous woman about looking for these manuals on this forum, and she said she would speak to her lawyer and answer me. After about 6 months waiting, I'm asking here now. I wouldn't mind buying from her business, should someone send these manuals to her. Quite the opposite, I would be very happy buying from her.No other place to get that manual, unless you are willing to pay quite a high price for a printed, unbinded copy, plus the courier/customs expenses to get it across the pond. I think it would be a pity if that resource is lost.But after waiting for about six months, I wouldn't care if someone sends/sells it to me directly, either. I do need at least HP8640B-opt323's manual.For HP3456A, I could do with the one that is available as free download, but after seeing how high quality is Artek's version (the widow sent to me the manual for HP8640B civil version thinking that was what I asked for, and I'm keeping it), I would like to get also HP3456A manual. Preferably from her if someone in this forum reads this post and makes the file available again to Artek.
Question about a Krohn-Hite 3343 dual variable filter - Page 1
Forum section: electronics / testgear

author: HalFoster
author_rank: Frequent Contributor
timestamp: January 03, 2024, 03:25:57 pm
content: I recently picked one of these up in very good shape and within specifications. It is an audio range filter - 99KHz max - and I'm wondering what it would be used for in practice.Thanks!
FG-100 DDS generator, need help identifying the IC - Page 1
Forum section: electronics / testgear

author: keenox
author_rank: Contributor
timestamp: November 15, 2023, 05:52:58 pm
content: Hi!Just bought 3 pcs FG-100 from Aliexpress and saw that they should come with Atmega328P and thought I could reprogram them, but mine came with some unmarked IC. Thought it is an Atmega chinese clone, but the pinout doesn't quite match. It only has one pin for GND and one for VCC. I marked what I managed to trace from the buttons and the programming header.Any idea what the IC could be and how I could program it?LE: Did a bit of searching and looks like it might be LGT8F328P, but not 100% sure yet

author: coromonadalix
author_rank: Super Contributor
timestamp: November 15, 2023, 06:03:37 pm
content: yeah normally atmega family or some stm32 ic's in most of their gimmickcould be atmega family but not the 328 ?? you have to search all the datasheets pinouts ??some where atmega 48 ??as you may know mostly dip ic's pinoutsyou had one project on the web to improve it / add more functionalitymaybe with avrdudess / avr dude and an isp programmer you try to read the mcu id while going into all the mcu library

author: keenox
author_rank: Contributor
timestamp: November 15, 2023, 06:10:24 pm
content: @coromonadalix: I am 100% sure it is not an Atmega chip as those have multiple GND and VCC pins and this chip only hase one of each. I did some searching and it might be a Chinese 328P clone, LGT8F328P, but I have yet to confirm it.

author: coromonadalix
author_rank: Super Contributor
timestamp: November 15, 2023, 06:14:50 pm
content: you have the 328b who's not perfectly an 328pyours is a new variant, never saw theses with this mcu typei have one with an dip 328 ...

author: keenox
author_rank: Contributor
timestamp: January 01, 2024, 07:14:13 pm
content: It's not an atmega328pb.If anyone else is interested, I have fully confirmed it is an LGT8F328P. It even has a 32Mhz oscillator on the PCB. I managed to read the flash using LGTISP (https://github.com/brother-yan/LGTISP) flashed to an Arduino Nano. Next, I will try the custom firmware by@tim.savage
TSOP RAM Tester - Page 1
Forum section: electronics / testgear

author: More
author_rank: Newbie
timestamp: January 03, 2024, 07:00:18 pm
content: Hi Guys,Longtime reader first time poster... Firstly I'd like to thank the forum for the help over the years and apologise if this question might have been asked in the past.I'm trying to build a jig to test individual TSOP RAM devices. My plan is use a working RAM DIMM that has the same RAM fitted that I want to test, remove one of the devices and solder a 66 pin test socket via some short connections to where the device once was. I'd then fit the DIMM into a working PC, fit a suspect device into the flying socket and run some basic tests.My question is do you think I'll run into issues by adding a tiny bit of impedance into the DIMMS circuit caused by the short wires connected to the test socket and if so would there be any way to get around that issue?Also if anyone knows of any other solutions I'm all ears.Thanks for any helpMore
Fluke 789 top cover replacement - cant work out how to remove rotary switch - Page 1
Forum section: electronics / testgear

author: instronumber1
author_rank: Newbie
timestamp: January 01, 2024, 03:49:32 am
content: Hello to all and hapy new year,I'm in the process of replacing the top cover on my Fluke 789 process meter, I'm having a bit of trouble trying to work out how to remove the rotary switch assembly.I cant see anything obvious, and I'm reluctant to force it apart due to how expensive the parts are.I'm hoping that someone here has done this before and can provide me with some insight.I've attached a photo of my meter internals for reference.Thanks in advance for your time.

author: coromonadalix
author_rank: Super Contributor
timestamp: January 01, 2024, 04:16:19 am
content: you should push the white hexagonal figure, its a shaft who insert in the rotating dial / contacts be careful not to loose them and deform themseehttps://www.sistest.com.br/loja/?product=fluke-187-189-87-iv-89-iv-knob-botao-externonot sur if the size is the same as 1/4 hex stud drill bit ?? or better use some allen key ??

author: instronumber1
author_rank: Newbie
timestamp: January 01, 2024, 04:24:23 am
content: Thank you very much for the information, I shall try that and report back
Trustworthy supplier of NEW EPROM memory for HP8563E - Page 1
Forum section: electronics / testgear

author: djsb
author_rank: Super Contributor
timestamp: December 30, 2023, 09:56:12 pm
content: I'd like to download the firmware from my HP8563E Spectrum Analyser and reload it into a set of 6 new EPROM chips.It uses 6 off AM27C020-120DC UV erasable EPROMS. As I'm assuming that the LABEL is are covering the UV window on each chip I will also either need 6 new labels or I'll need to carefully peel the originals off.Is there a trustworthy source for these chips (NEW not used) either in China, Europe or anywhere else at a reasonable price? Also, is this firmware downloadable from anywhere just in case (I can post any details written on the labels later if needed)? Thanks.

author: perdrix
author_rank: Frequent Contributor
timestamp: December 31, 2023, 10:41:09 am
content: I greatly doubt you'll find new ones. You'll have to look for used ones on (e.g.) eBay. I've bought a fair number of EPROMS on eBay and while I've had the occasional bad part in batch of (e.g.) 10, I've only ever had a fake part on eBay twice, and eBay refunded me on both occasions.You'll need to remove the labels and use a UV eraser to blank them and a burner to programme them. New labels to protect against incidental UV damage.David

author: gslick
author_rank: Frequent Contributor
timestamp: January 01, 2024, 01:50:50 am
content: You can buy AT27C020-90PU parts brand new direct from Microchip for $5.45 each in the US.https://www.microchip.com/en-us/product/at27c020#purchase-from-storeOr £4.36 fromhttps://uk.farnell.comThese are plastic OTP parts, not ceramic UV erasable parts, but if the firmware version will never be updated at this point it's not like you would need to erase them and reprogram them again. Plus you never need to worry about labels falling off and exposing the UV windows to stray ambient UV light.

author: Whales
author_rank: Super Contributor
timestamp: January 01, 2024, 02:12:44 am
content: If you need rewritable instead of write-once: the AM27C020-120DC interface looks simple enough that a PCB with a parallel FRAM and voltage shifter might also be a substitute. FRAM has data retention in the (expected) centuries and can be rewritten as easily as SRAM if you want to reprogram later.
AIOMEST 7400A AC Line Splitter doesn't work with polarized plugs - Page 1
Forum section: electronics / testgear

author: the_cake_is_a_lie
author_rank: Contributor
timestamp: December 31, 2023, 11:30:46 pm
content: It's the only line splitter I could find that works on 100-240V, 50-60 Hz. Downside is no polarized plug can connect to it, which is everything I want to measure. In the US, one prong is usually wider than the other to indicate the neutral and it's this neutral that doesn't fit. Seems like an incredibly dumb idea to sell this in the US. Of course, the line splitter doesn't work with (polarized) 3 prong plugs either.Most line splitters I can buy in the US are compatible with polarized plugs right?
The TEKTRONIX 6010A Synthesized Signal generator - Page 1
Forum section: electronics / testgear

author: tecophil
author_rank: Newbie
timestamp: December 31, 2023, 10:46:53 am
content: Hi folksI have recently purchased a Tektronix 6010A Synthesized Signal Generator , in general good working order, but needs calibrating. I have searched for any source of a user/service manual - including Tektronix's normally useful site - without success ! I accept it an older item of gear, but is a useful ,clean source of sine wave . can anyone be kind enough to let me have a pdf copy of any manual/s for this purpose. ThanksRoy
Probe holders for a DHO942s on VESA arm - Page 1
Forum section: electronics / testgear

author: RAPo
author_rank: Super Contributor
timestamp: December 31, 2023, 12:22:23 pm
content: I've acquired a DHO942s that will be put on a GRIFEMA Monitor stand.The USB-c and plan cables can be put nicely in the Vesa arm.But what are you guys using for storing the probes?Ideally, I would like to put all four probes on the scopes bnc's and, with a swift manoeuvre, get the number needed of probes to the circuit. Then, after use, put it neatly away.
Hitachi V-352 oscilloscope manual? - Page 1
Forum section: electronics / testgear

author: Axtman
author_rank: Regular Contributor
timestamp: December 30, 2023, 01:57:25 am
content: Does anyone have a manual for a Hitachi V-352 oscilloscope? Thanks!

author: ebastler
author_rank: Super Contributor
timestamp: December 30, 2023, 08:33:36 am
content: I assume it's the service manual you are after? There is one on this site, although in a slightly inconvenient format, individual PNGs per page:http://w.ko4bb.com/getsimple/index.php?id=manuals&dir=06_Misc_Test_Equipment/Hitachi

author: Axtman
author_rank: Regular Contributor
timestamp: December 31, 2023, 12:16:37 am
content: Thanks!I worked some Adobe software magic and converted the PNG files to PDF files and combined them to one file.The PDF service manual is located here.
Bluetooth (not BLE) packet trace capture - Page 1
Forum section: electronics / testgear

author: bson
author_rank: Unknown
timestamp: December 30, 2023, 09:17:08 pm
content: I'm on the hunt for a cheap and simple tool to capture Bluetooth classic packet traces. Not BLE or I'd just use the $25 Adafruit nRF51 based sniffer. Only really interested in high-level protocols, more specifically determining why a particular BT device fails to connect to a car head unit. So I imagine a simple and cheap solution is a sniffer (ISM band SDR based, or PC host based if the BT radio can be put into promiscuous mode) that captures and dumps packets to a pcap file to look at in wireshark, not unlike what one might do with a crude tool like tcpdump. I don't really need precise timestamping, real-time capture and view, compliance verification, etc etc. Just dump the traffic to a file then filter and decode offline. I can even set up a controlled environment where there's guaranteed not to be any other BT radios. This is pretty much a one-off so I don't really see much need to spend thousands on it. Help!
Little bigger piezo + Spectrum Analyser = destroyed input? - Page 1
Forum section: electronics / testgear

author: William_K
author_rank: Contributor
timestamp: December 31, 2023, 11:51:46 pm
content: Hello guysWill start dealing with little thicker and beefier piezos soon and a SA will be invoved in that.It's a very known fact that if you mechanically move a piezo it generate a voltage and if fast and hard enough that could be very high, it feels very much that this is something that had to be though about when testing this, or? The same with a waveform generator, any risk involved at all?The SA cost 2k+ so I want to be dam sure about this and thus I ask before I test.Regards William

author: tautech
author_rank: Super Contributor
timestamp: January 01, 2024, 12:52:30 am
content: Why a SA and not a DSO ?

author: xrunner
author_rank: Super Contributor
timestamp: January 01, 2024, 01:04:55 am
content: Quote from: tautech on January 01, 2024, 12:52:30 amYea really. Or -Let me ask this. What are you trying to observe William_K? The wideband frequency spectrum of a piezo? Just attach a BNC cable to the input of your spectrum analyzer and at the other end a small coil of wire to the center conductor.Do not attach this to the piezo!Simply move it near enough to observe the spectrum.

author: William_K
author_rank: Contributor
timestamp: January 02, 2024, 04:03:40 pm
content: Sure a DSO could work as well I guess, but there is a TG on the SA so I though using that somehow for it all? There might be more than one resonance in it due to reasons I cant go it to and thus I would like to see a little bit over and under its resonance frequency what is happening there.

author: AVGresponding
author_rank: Super Contributor
timestamp: January 02, 2024, 04:45:29 pm
content: Inverse parallel diodes across the input?

author: William_K
author_rank: Contributor
timestamp: January 03, 2024, 12:13:42 am
content: That could be a choice I think, thanks. I would prefer so it could free running to what ever voltage it would, but that could be clamped with diods or even a zener I guess then.

author: AVGresponding
author_rank: Super Contributor
timestamp: January 03, 2024, 11:24:40 am
content: It'll clip, yes, but then you have a chance to reduce the input amplitude until it doesn't.