hybridfree/eevblog-posts huggingface dataset:
A very sad Tek 585 - Page 1
Forum section: electronics / testgear

author: Martin Hodge
author_rank: Unknown
timestamp: November 05, 2019, 02:27:37 am
content: This one is going to be beyond my abilities to resurrect.

author: 0culus
author_rank: Super Contributor
timestamp: November 05, 2019, 02:51:46 am
content: This stuff you've been posting was in a flood no doubt. Or left outside. Sad.

author: Martin Hodge
author_rank: Unknown
timestamp: November 05, 2019, 03:46:37 am
content: This is one of five. The worst one. I've finished a 575, am mostly done with a 535 and next in line is a 547 followed by a 549. The Heathkit rounds out the group of 6 that I grabbed off Craig's List. Got a great deal even considering the two lost causes.

author: med6753
author_rank: Super Contributor
timestamp: November 05, 2019, 06:43:22 pm
content: While it may be a total loss there is a proven method for cleaning up Tek scopes subject to this abuse.Remove all the tubes including the CRT.Remove the power transformer and either cover, or better still, remove the HV transformer.Spray the entire chassis with Simple Green, allow to soak for a while.Hose it down with preferable de-ionized or distilled water.Bake in an oven at about 150 F for a few days.Granted, it's a lot of work and you still might have a basket case. It's a tough call.

author: Cubdriver
author_rank: Unknown
timestamp: November 06, 2019, 11:59:01 am
content: Ohh, it hurts to see that. But if you're feeling ambitious and want to roll the dice, follow med's advice & strip it down and give it a bath. It certainly can't HURT it any further...-Pat
waveform always drifts slowly to the left or right... Hantek DSO # DSO5072P. - Page 1
Forum section: electronics / testgear

author: Timothy1027
author_rank: Newbie
timestamp: November 05, 2019, 10:37:35 pm
content: I recently bought a Hantek DSO (model # DSO5072P) on eBay.The unit appears to have a defective operation.With channel 1 connected to the 1 KHz calibration terminal on the front panel, this waveform remains FIXED.The display for channel 2 (connected to a signal generator) the sine wave slowly drifts to the left.The trigger is set to channel 1.The non-triggered channel waveform always drifts slowly to the left or right.Is this normal behavior or not?If the scope must have only one trigger source, why does it display 2 channels simultaneously?

author: tautech
author_rank: Super Contributor
timestamp: November 05, 2019, 11:16:09 pm
content: Yep quite normal for unrelated signals.Sometimes you get lucky and get 2 signals that are frequency related and then both are stable even though the trigger is set to only on one of them.Investigate the trigger suite modes as you may find tools (settings) that permit solid triggering on the other unrelated channel.
Rigol 1054Z user-error or oscilloscope problem? - Page 1
Forum section: electronics / testgear

author: rpetitho
author_rank: Contributor
timestamp: November 04, 2019, 06:51:24 am
content: So I was doing some testing on a project and had a strange issue. Here are three photos of the response curve I was testing. All are the exact same curve with very different oscilloscope measurements. First photo was a single shot at 500mv resolution, second photo is the same shot zoomed out to 1v resolution, third is another shot of the same response at 1v resolution. Did I screw something up? Why do the last 2 photos look so different when they should look very similar? Let me know if you need more info.[ Specified attachment is not available ]

author: Fungus
author_rank: Super Contributor
timestamp: November 04, 2019, 09:08:54 am
content: Quote from: rpetitho on November 04, 2019, 06:51:24 amI think what you're seeing is op-amp overload/recovery.Your signal goes way off the top of the screen somewhere and is overloading the op-amp responsible for vertical scale. Anything that happens before it has chance to recover from that is undefined. Switching to a different vertical scale will change the op-amp gain setting (or maybe even use a completely different op-amp) so you see different results.nb. This happens to all op-amps and all oscilloscopes.https://www.google.com/search?q=op+amp+overload+recovery+time

author: JohnPen
author_rank: Regular Contributor
timestamp: November 04, 2019, 09:18:51 am
content: I was just about to say the same thing but Fungus beat me to it. The return edge on the original shot is the poor op-amp struggling to recover!

author: rpetitho
author_rank: Contributor
timestamp: November 04, 2019, 10:17:21 pm
content: Always something new to learn. I think my project may be performing better than the oscilloscope would have me believe. Thanks!-Bob

author: hgjdwx
author_rank: Regular Contributor
timestamp: November 05, 2019, 01:38:49 am
content: I don't think that's normalhttp://v.youku.com/v_show/id_XNDQyNDg2NzgzNg====.html

author: Miti
author_rank: Super Contributor
timestamp: November 05, 2019, 12:00:45 pm
content: I think even in the second shot (third picture) you saturate the input. You should always keep the trace within the screen limits to trust what you see.

author: Fungus
author_rank: Super Contributor
timestamp: November 05, 2019, 12:55:35 pm
content: Quote from: Miti on November 05, 2019, 12:00:45 pmAnd if a detail is so small that you need to push the rest of the signal far enough off the screen to cause problems? That detail isn't important...
Source for connectos for BK 8500B load - Page 1
Forum section: electronics / testgear

author: mercoz
author_rank: Newbie
timestamp: November 04, 2019, 07:48:04 pm
content: Was looking at the BK Precision site, and noticed they have a new revision of the dc loads, the 8500Bseries. The terminals have the traditional spade terminal, but now it has a built in banana connector in the middle. Does anyone know who makes these? I would like to buy just the connectors and retrofit my existing loads with these.

author: BillB
author_rank: Unknown
timestamp: November 05, 2019, 12:24:38 am
content: Those are great looking connectors - I haven't been able to find anything like that, but did pick up some of these:Check this thread:https://www.eevblog.com/forum/testgear/siglent-sdl1000xsdl1000x-e-electronic-load
ad9910 evaluation board - Page 1
Forum section: electronics / testgear

author: ant17
author_rank: Regular Contributor
timestamp: November 12, 2019, 01:05:46 am
content: hi guys i brought a ad9910 evaluation as signal generator of many diffrent waveforms to help make sure my scope is with in calibration i have been going over some of the sample files for ram mode which text file in decimal binary or hex but i can't under stand how i can write a file to generate a square or triangle or sawtooth or time marking pulse can someone please go over the process with me as don't full understand adjustble phase amplitude and frequency shape waveforms if some could help me out i would be really greatful
Owon HDS1062M, HDS3102M, HDS4202M 2 Channel Handheld 'scopes - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: November 04, 2019, 05:35:35 pm
content: Does anyone have any experience of these two channel handheld 'scopes (strictly they're 'scope-meters)?I think they're also sold under the Multicomp brandYes I know Owon aren't the greatest.Dave
Fluke 87V and 187 conductance range only showing numbers in nanosiemens – why? - Page 1
Forum section: electronics / testgear

author: evava
author_rank: Regular Contributor
timestamp: November 01, 2019, 10:04:58 am
content: Probably more of you noticed that ranges of conductance in both of these meters are wider than described in respektive manuals (each meter about one order, but each meter in other direction):F87V : conductance range actually in HiRes mode starts from nice 0.001nS which equals to 1 teraohm (!)F187/189 : conductance range actually ends at slightly more than 500nS which equals to slightly less than 2 megaohmWhich brings me to the question:why no one meter offers recalculation/displaying in gigaohms(megaohms) at the push of a button, or directly (where is possible) on secondary display, like showing AC and DC at the same time?I feel I can imagine resistance in gigaohms (and megaohms) better than conductance in nanosiemens (e.g. more understandable 6,6Gohm vs "do not know what that means" 0.15nS)…

author: CDaniel
author_rank: Frequent Contributor
timestamp: November 01, 2019, 12:20:08 pm
content: Probably the people who use insulation testers for this high value resistance are used to conductance ... that's why .

author: threephase
author_rank: Regular Contributor
timestamp: November 02, 2019, 07:45:30 pm
content: A conductance measurement is predominantly used in a laboratory environment / physics experiment, so I presume why some multimeters have a conductance function on them.I have not come across an insulation tester that shows a measurement in conductance, it will either me in k/M/G Ohms or m/u Amps as a leakage current. Some instruments will allow you to switch between the two.When carrying out HiPot tests at high voltages we always measure leakage current and plot that.They are selling the instrument with a conductance measurement function, so naturally it will show the result in Siemens. They would expect the operator to use the resistance function if the answer is required in Ohms or move to an insulation tester if the reading is beyond the resistance range of the multimeter instead of using the conductance function.Kind regards.

author: joeqsmith
author_rank: Super Contributor
timestamp: November 02, 2019, 11:39:21 pm
content: Its just another way to present the data. With a 0.01nS resolution, one count is 100 GOhms. two counts is 50 GOhms, three counts is 33.33 GOhms, 10 counts is 10GOHms. The resolution would be poor and I doubt many users may not want to see the display bouncing from 100G to 50G. It could be done. Accuracy on the handheld meters is not all that good. Normally if I need to read very low currents or high resistance, I am not using a handheld meter. It can present challenges even with better equipment. I have shown some pictures on EEVBLOG of some fixtures I used when making measurements like this.

author: evava
author_rank: Regular Contributor
timestamp: November 04, 2019, 08:18:53 am
content: Quote from: joeqsmith on November 02, 2019, 11:39:21 pmThank you!Bouncing values, yes, I did not realize that.It would be very unpleasant to look at!
HP 35665A with disturbing spurs - Page 1
Forum section: electronics / testgear

author: Sören_Marodören
author_rank: Contributor
timestamp: November 02, 2019, 08:58:01 pm
content: Hi,I just recently bought a HP 35665A Dynamic Signal Analyser (DSA).It works really good but I have noticed that there are disturbing spurs at 24.667 kHz (plus over tones) and 34.588 kHz (plus over tones). See picture Spurs.jpgThe spurs are there at both ch1 and ch2, but they are a few dB stronger on ch1. If I terminate the inputs they go down a bit but not completely.Ch1_Ch2_not_terminated.jpg show a close up at 24.667 kHz with both ch1 and ch2 unterminated.When I connect Source to one of the channels the 24.667 kHz spurs get even stronger. See Ch1_to_source_Ch2_not_terminated.jpg.This happens even without turning Source on. The peaks on the side of the 24.667 kHz main spur are separated 55 Hz from each other.Therefore I took my home made EMC probe (one turn of a semi-regid coax with the shield opened a few mm) and connected it to ch1 and started to sniff around the unit.It turned out that the strongest signal came from the front of the CRT. And it looks different depending on where on the screen I place the probe.See Ch1_EMC_probe_CRT_bottom.jpg, Ch1_EMC_probe_CRT_center.jpg and Ch1_EMC_probe_CRT_top.jpgIf the spurs comes from the CRT this can explain why ch1 see a stronger level than ch2 and probably also why the Source have it even stronger.(In time domain the signal from the CRT looks in Ch1_time_domain_24667Hz_spur.jpg. The time period of the signal is 18 ms that corresponds to 55 Hz between the side spurs.)So now I wonder if someone out there who have an 35665A DSA can check if you also have these spurs.I want to know if this is a known problem and maybe difficult to solve or if it actually just a faulty decoupling or filtering somewhere.Can someone explain the background of this 24.667 kHz? Is it related to frame rate, line frequency, resolution (560x400??) or something else?Or is it related to the 230 VAC/50Hz supply voltage we have here in Sweden?For the 34.588 kHz spur I have no clue where it comes from. With the probe I can see it on different places like ribbon cables ets.But I don't see it in front of the CRT.Thanks in advance,/Sören

author: Kleinstein
author_rank: Super Contributor
timestamp: November 02, 2019, 09:07:16 pm
content: The 24.xx kHz could be the horizontal defection signal. I would expect it to be somewhere between some 16 kHz (NTSC/PAL) and some 32 kHz (old VGA).The signal from the CRT could find it's way though the air (magnetic coupling), via acoustics and via the supply.

author: Whales
author_rank: Super Contributor
timestamp: November 02, 2019, 09:14:26 pm
content: 24.6666 KHz sounds like the horizontal sweep frequency of the CRT.400 lines * 60 hertz = 24000, then add a little time for the beam to move during blanking periods.You're on the right track with it being from the screen drive signals, however, it looks like it's 100 dB down. Are these peaks really an issue? Everything is relative and I have not used this equipment before, but that sounds really nice and quiet to me
Anyone make a beaglelogiic: a Beaglebone Black MCU  14ch 100Mhz logic analyzer? - Page 1
Forum section: electronics / testgear

author: wnorcott
author_rank: Regular Contributor
timestamp: November 01, 2019, 07:48:16 pm
content: There was a coding project by Kumar Abhishek that turns a Beaglebone Black single board computer into a 14 channel, 100 MHz logic analyzer.It's discussed here:https://beaglelogic.readthedocs.io/en/latest/and it uses Sigrok software. It apparently has a wireless web server in addition to the USB interface. His site already has an SD card operating system image on it you don't have to do any kernel building or compiles etc.Very interesting looking project, hats off to Abishek. I think when you add in needed buffers and clamping diodes for voltage protection on all the pins and add in the cost of some nice silicone leads not to mention a case for it, it would be cheaper to buy a LA2016 that is 200 MHz. But I already have a Beaglebone Black kicking around. Has anyone tried this and can give some advice or pros/cons? Is it a practical logic analyzer or more of a term paper project? Thanks.

author: MosherIV
author_rank: Super Contributor
timestamp: November 01, 2019, 08:04:03 pm
content: Hi.I have not tried the project, I do not have a bbb.Generally speaking, using a full blown computer to implement a logic analyser is not a good idea.If capture is software driven, controlled, the capture rate could be inconsistent.Then there is memory depth.That is why the Saleae and clones all do it with an fpga.However, if your bbb is going spare - go for it.

author: wnorcott
author_rank: Regular Contributor
timestamp: November 01, 2019, 09:43:27 pm
content: Beaglebone Black actually has has two Programmable Real-Time Units (PRU) that are programmed by, but separate from the CPU. In this project the pair of PRU do the data acquisition and apparently write to shared memory. I am still reading the project notes as I go. It is mapped to an input device /dev/beaglelogic. I have never figured out how to use a PRU myself.

author: wnorcott
author_rank: Regular Contributor
timestamp: November 02, 2019, 02:13:44 pm
content: The missing stuff like the buffering that I mentioned about the original design actually requires an add one Beaglebone 'cape' ( a daughterboard like an Arduino shield) with the missing buffer on it, and that seems to be unobtainable. I found photo a prototype it uses a 74LVCH16T245 similar to the Salea clones using a 74HC245 (for 8 channels).At this point I think I will just go with the LA2016 and be done with it and keep my Beaglebone Black for other projects.
Tektronix DMM155 User manual - Page 1
Forum section: electronics / testgear

author: Bluebottle73
author_rank: Newbie
timestamp: March 14, 2016, 01:26:36 pm
content: Hi there,Does anyone have a copy of the user manual for the Tektronix DMM155? (Or failing that, a datasheet with the full specifications on it). I have tried emailing Tektronix themselves, but am yet to receive a response from them.Thanks,

author: kanuk
author_rank: Contributor
timestamp: March 14, 2016, 06:46:59 pm
content: http://www.davmar.org/Spec/TekDMM254.pdf

author: boggis the cat
author_rank: Regular Contributor
timestamp: March 16, 2016, 06:02:29 am
content: Quote from: Bluebottle73 on March 14, 2016, 01:26:36 pmThis is a service guide that includes that model:http://www.tek.com/oscilloscope/dmm912-manual/handheld-instruments-technical-referenceWe have a scan of the user manual, but it is all in TIFF format and I don't have time to mess around with converting it. If you have somewhere I can dump two 30 MiB files then send me a PM.

author: TubeDoc
author_rank: Newbie
timestamp: November 01, 2019, 09:51:53 pm
content: Did anyone ever find the manual for the DMM-155 or scan in an old one?Thanks in advance for anyone who can help?Rob
Tektronix 465 soft sizzling noise + fan not running - Page 1
Forum section: electronics / testgear

author: paulvo
author_rank: Newbie
timestamp: October 20, 2019, 08:57:20 pm
content: As my Tektronix 465 started making some soft sizzling noise, I opened it to inspect.I noticed the classic dirt in the HV section, and behind the blue plastic back cover, which I cleaned out.While switching it on, I have the impression that the sizzling noise is not coming from the HV section, but from somewhere more inside. Could it be somewhere inside the CRT compartment itself ?Another thing I noticed is the fan did not run. Is it supposed to immediately start running after power on ? When I try to rotate it manually, it gives the same physical resistance as say a stepping motor. I expected a free and loose run like for instance a PC cooling fan.Could that cause an issue inside the CRT section ?So far the 465 is still fully functional, albeit with a dirty horizontal position potmeter...But my understanding is that sizzling noises and error-free operation do not combine.(Oh yes, as a preventive measure, I replaced the 2 parallel tantalums 22µF in the 5V power supply section with a 100µF/50V electrolytic).Paul

author: james_s
author_rank: Super Contributor
timestamp: October 20, 2019, 09:46:59 pm
content: The fan should definitely be running any time the scope is on. Could the sizzling noise be coming from the fan motor? I've never had the fan in mine apart but I think it should spin freely. Not having the fan working is definitely going to be a problem.

author: Alfons
author_rank: Regular Contributor
timestamp: October 21, 2019, 06:00:49 pm
content: With the old devices: measure all voltages and especially the ripple. Only then can you go to troubleshooting.

author: paulvo
author_rank: Newbie
timestamp: November 01, 2019, 05:42:28 pm
content: Some feedback : I measured on the collector of Q1698 about +14,68 V (instead of +5,4V), and behind the 280 ohms resistors R1693 and R1694 I measured 4,5 V (instead of +1,6V).So I removed the PCB with the fan-motor still attached to it. A tiny 1,3mm hexagonal key is required to remove the fan.I removed the PNP transistor Q1698 to check it out, but nothing seemed to be wrong with it.So I put it back into the socket, and applied 15VDC to the supply pins.The motor started to run !After that, I just mounted the PCB with the fan-motor back into the Tektronix 465, attached the fan again, and it started running immediately after turn on.After a while I can hear the sound vary, so the temp sensor is also working fine.No more sizzling noise is produced.Conclusion: there must have been some bad contact of the transistor pins in its socket.
making scope accessible over wireless - Page 1
Forum section: electronics / testgear

author: Gibson486
author_rank: Frequent Contributor
timestamp: November 01, 2019, 01:32:21 pm
content: We just got a R&S RTB2000 series scope. It comes with the Ethernet interface. Is there a way to make this a wireless server of some sort so any one can access the external remote interface just by typing the ip address? Note that this is going in a lab that is fully wireless. Ethernet jacks are normally not available.

author: martin1454
author_rank: Regular Contributor
timestamp: November 01, 2019, 01:35:32 pm
content: Maybe something like this:https://www.bhphotovideo.com/c/product/1203432-REG/iogear_gwu637_ethernet_2_wifi_universal_wireless_adapter.html

author: Rich@RohdeScopesUSA
author_rank: Frequent Contributor
timestamp: November 01, 2019, 03:05:33 pm
content: Yep. This is what I do in my home lab. I use a wifi repeater like this one:https://www.amazon.com/Vonets-VAP11G-300-Wireless-Multi-Functional-Amplifier/dp/B014SK2H6WWorks great.And congrats on the RTB2000!-Rich
DP832 Timer/Delay - Page 1
Forum section: electronics / testgear

author: wolfgang6444
author_rank: Newbie
timestamp: October 27, 2019, 04:59:22 pm
content: I own a Rigol DP832 and want to use the timer/delay but don't understand how to set it up from the front-panel.The user-manual is not much help either. Maybe somebody can give me a kick-start.What I want to do:For some HTOL-test I want to program the DP832 to force say 12V with say 1A of current-limitation.Now I want to interrupt this every 10minutes for say 10 seconds - either by switching the corresponding output off/on, or by periodically setting the voltage to 0V.I would like the instrument to cycle this forever.If possible I would prefer to this without controlling the instrument externally.Many thanks,Wolfgang

author: H.O
author_rank: Frequent Contributor
timestamp: October 28, 2019, 07:30:59 pm
content: I'll try a step by step instruction:Press the Timer button to enter the Timer/Delayer feature.Press soft button Timer SetPress soft button Groups, enter 2, press OK.Press soft button Parameters, use the Up(V), Down(mV), Left(mA), Right(A) keys to navigate the "cells" of the Groups at the bottom of the screen.Enter 12V, 1A, 600s for Group 0 and 0V, 0A, 10s for Group 1.Press the -->1/3 soft button until you see the Cycles option at the bottom, press it until Cycles reads infinitePress the -->2/3 soft button until you see the 'Enter button' at the bottom, press it to get out of the configuration window.Now enable the output and then press the Timer Off soft button, confirm the message with the OK button./Henrik.

author: wolfgang6444
author_rank: Newbie
timestamp: October 29, 2019, 07:40:59 pm
content: Great,this seems to work.Is there a way to use more than a single output at a time with timers?Many thanks,Wolfgang

author: JDubU
author_rank: Frequent Contributor
timestamp: October 29, 2019, 07:59:44 pm
content: You can press the channel select buttons on the front panel (labelled 1, 2, 3) while in the timer settings screen to edit each channel separately.

author: H.O
author_rank: Frequent Contributor
timestamp: October 29, 2019, 08:04:14 pm
content: Yes, I just tried it - as JDubU says.For what originally described perhaps the delayer is a bit easier, I don't know.

author: wolfgang6444
author_rank: Newbie
timestamp: November 01, 2019, 09:29:14 am
content: O.K.,I think I got the concept:There is actually a separate timer per channel.Each timer can be programmed, started and stopped independently.What is called 'Group' is actually a single step in the programmed sequence.Many thanks,WolfgangBTW:Can I also program the On/Off switches?
Schematics of photos of SLA1016 wanted - logic analyzer for Siglent scope - Page 1
Forum section: electronics / testgear

author: wsowa
author_rank: Newbie
timestamp: October 23, 2019, 07:04:49 pm
content: Hi,Has anyone tried to reverse engineer Siglent's MSO addition to SDS1104X-E scope - SLA1016? I imagine it can't be very complicated device. Perhaps someone has schematics or maybe an owner of the device would like to take it apart and post the pictures?

author: tmbinc
author_rank: Frequent Contributor
timestamp: October 23, 2019, 07:30:37 pm
content: Unfortunately I still haven't seen a teardown of it, but common belief is that there's an independent acquisition system in there (so basically Zynq FPGA+Memory) that syncs with the scope, and (slowly) transfers the capture to the scope.

author: wsowa
author_rank: Newbie
timestamp: October 30, 2019, 11:48:08 am
content: Oh, ok, I see. So it won't be that easy and low cost to replicate. These FPGAs are rather quite expensive...

author: Gege34
author_rank: Contributor
timestamp: October 31, 2019, 01:06:52 pm
content: I have it (at works) but the case is sealed. So impossible to open without damaging it.But like tmbinc said I suppose it's base on FPGA and not so easy to duplicate.

author: GerryR
author_rank: Frequent Contributor
timestamp: October 31, 2019, 04:24:42 pm
content: ITT Pomona made a logic probe kit to interface with an analog scope, mdl MX 9100. It had 8 inputs, but you could cascade up to 3 units for 24 points to monitor. Operating frequency was DC to 20 MHz. It had trigger word capability and other trigger options. It had 3 memory banks with 16-word memory depth each for replay; not much but worked pretty well. I don't know how it would work with a DSO, but I expect it would be ok. If you can hunt one down, it might be an inexpensive option for you. Just a thought.

author: tv84
author_rank: Super Contributor
timestamp: October 31, 2019, 08:27:53 pm
content: The SLA1016 surely has a Zynq inside.I conclude that fromthis.The app of the SDS1004X-E can be run in the Zynq of the SLA and work accordingly to its specificities.
Hewlett Packard 8590A Spectrum Analyzer.  - Page 1
Forum section: electronics / testgear

author: iRepairElectronics
author_rank: Contributor
timestamp: October 31, 2019, 05:58:20 pm
content: Hewlett Packard 8590A, Looks good i can get for s decent price of about $350.ooAnybody got thought's on this one? should i hold out for a better model? if so what would that be.
Tek Manuals - Page 1
Forum section: electronics / testgear

author: andy3055
author_rank: Super Contributor
timestamp: November 02, 2019, 01:48:52 am
content: Came across this site and thought I will post it here. Not sure if anyone has posted before.https://archive.org/details/manuals_tektronix

author: tautech
author_rank: Super Contributor
timestamp: November 02, 2019, 10:04:57 am
content: Thanks, added to here:https://www.eevblog.com/forum/index.php?topic=33739.msg478132#msg478132
Dranetz 626 PA 6003 Service Manual? - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: October 03, 2016, 05:36:18 pm
content: I'm looking for the Service Manual for the PA-6003 plugin (3-phase mains monitor card) for the Dranetz 626. Can anyone help?ThanksDave

author: perdrix
author_rank: Frequent Contributor
timestamp: October 11, 2016, 07:59:35 pm
content: I contacted Dranetz and asked about the manuals:QuoteROTFL - as if ...Strikes me as a bit greedy for manuals for stuff that's at least 25 years old!Dave

author: perdrix
author_rank: Frequent Contributor
timestamp: January 12, 2019, 06:54:02 pm
content: I'm bumping this topic just in case anyone has found a service manual for this? Or even reverse engineered a schematic?ThanksDavid

author: perdrix
author_rank: Frequent Contributor
timestamp: October 30, 2019, 11:16:34 am
content: Bumping again ...

author: _Wim_
author_rank: Super Contributor
timestamp: October 30, 2019, 07:08:56 pm
content: This might be an alternative:https://www.ebay.com/itm/Dranetz-626-PA-6003-3-Phase-Analog-Line-Monitor-Analyzer-Card-/312115218001
Replacing CRT in TDS540B with a colour LCD? - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: October 28, 2019, 12:05:41 pm
content: The thread on hacking the TDS540B and similar 'scopes says:>Before you upgrade, you should first install the color LCD monitor via the VGA out connector.Unfortunately the OP doesn't say any more about that, but gets into the process of adding RAM etc..If anyone has done this I'd appreciate some details - e.g. which LCD panels are suitable and are they a straight mechanical fit or is work needed on the case etc., and how to wire it in?ThanksDavid

author: nctnico
author_rank: Super Contributor
timestamp: October 28, 2019, 05:01:44 pm
content: The easiest is to buy a conversion kit. This plugs into the VGA connector at the back of the scope. However I wouldn't be too quick to install a color LCD. The B&W scopes in these series have a feature which the color versions don't: it will show the previous acquisition as a faint line. This can be very handy in some cases.

author: EE-digger
author_rank: Frequent Contributor
timestamp: October 30, 2019, 12:47:48 am
content: I've done my own conversion and also bought a kit. Go with the kit if you decide to convert. The seller's later kit buffered the signals for return to the rear panel so you don't lose the external video port.The LCD has a bright, burn-proof screen, but the CRT inherently anti-aliases graphic lines. If you're viewing a square wave or other signal with almost vertical lines, the LCD will make the vertical line segments stand out like a staircase, where the CRT smooths them into one line.

author: perdrix
author_rank: Frequent Contributor
timestamp: October 30, 2019, 01:54:39 am
content: Which kit were you folks using? The Simmconnlabs one - or is there a cheaper one?David
Tek 2465A -8V -5V too low - Page 1
Forum section: electronics / testgear

author: Galen
author_rank: Regular Contributor
timestamp: October 30, 2019, 11:39:38 am
content: I got a Tek 2465A, no trace. Sometimes, trace appear, but always 1 line, even I input signal.As first attempt, I measured J119 voltage, found the +10V is right to the point, and most others are also within limit, except the -8V and -5V, I got -4.7V and -2.9V respectively. As per the SM, should fix the -8V problem first. I checked the -13.1V (before regulated to -8V), it's -8.7V only.Anybody in this forum, has the experience to fix this problem, your advice is very appreciated. Thanks a lot in advance.Galen

author: tggzzz
author_rank: Super Contributor
timestamp: October 30, 2019, 11:49:46 am
content: You'll find the answer here:https://www.eevblog.com/forum/repair/tek-2465a-8v-5v-too-low/msg2761426/#msg2761426Or use the search box at the top right.
Which "cheap" high voltage probe to buy?  - Page 1
Forum section: electronics / testgear

author: Noy
author_rank: Frequent Contributor
timestamp: September 05, 2019, 12:21:15 pm
content: Hi, i want to measure 2 Mosfet gates after an active PFC (around 400V) output . I try to repair a Manson SDP-2405. Active PFC -> Stepdown (Q7 / Q8 ) see attachement.To measure the gate of the "upper" Mosfet i need a high voltage probe (>400V Vgs highside switch)..A differential high voltage probe is a bit expensive only for this measurment.So i want to buy 1 or 2 "High-Voltage Probes" 100:1 (i think less than 1MHz BW required).Which one is a good, "cheap" one?It should be save for the expected voltage (don't want to destroy my scope (max. 300V RMS in)).I found the P2300C or P2301C from Cleqee on ali express (maybe the p4100 ?) or a testec TT-HV150 / TT-HV250 ?Do you have other probes in mind which can fit my needs?

author: Noy
author_rank: Frequent Contributor
timestamp: September 05, 2019, 01:56:22 pm
content: I threw the money in...Micsig DP10013 and Testec HV-250Both in total 160€...

author: tautech
author_rank: Super Contributor
timestamp: September 06, 2019, 09:16:38 am
content: Ideally to be properly covered you should have both a 100:1 probe and a differential probe.Any gawds amount of cheap 100:1 probes will do the job and the Pintek DP-25 is fine for a cheap Differential probe.

author: Noy
author_rank: Frequent Contributor
timestamp: September 06, 2019, 01:07:26 pm
content: What is the difference between the Testec HV-150 and HV-250? Beside the voltage and 5€ ? I think everybody will buy the 250..And what is the difference between Testec HV-150/250 or the Cleqee P2300 for around 35-45€ and the cheap P4100 things (15-20€) ?Only Build quality?

author: k.valentino
author_rank: Contributor
timestamp: October 25, 2019, 10:05:35 am
content: Quote from: Noy on September 05, 2019, 01:56:22 pmHi Noy,From where did you buy the probes for 160 €?Pease tell me! I am from Spain and want these 2 models. Thx

author: Micsig_support
author_rank: Regular Contributor
timestamp: October 29, 2019, 10:59:21 am
content: The Germany distributor batronix have the stock. you can ask them to buy it.

author: Noy
author_rank: Frequent Contributor
timestamp: October 29, 2019, 07:54:47 pm
content: I bought it from Amazon Prime for 121€ inkl. shipping and tax.The Testec probe from digitalo.de for 40€ inkl. shipping.
Fluke 77 case screw specs? (SOLVED -- thanks) - Page 1
Forum section: electronics / testgear

author: Nusa
author_rank: Super Contributor
timestamp: October 27, 2019, 09:31:29 pm
content: My father passed 3 weeks ago, and my sister and I are still clearing the house he lived in for 56 years. One of the things I have found is an original Fluke 77. Strangely it's in a Fluke 73 styrofoam and paper box with a Fluke 73 manual. I put a battery in it, and it appears to be in good working order. However, it is missing the four case screws that hold the back to the front.Does anyone have the exact specs (size, length, pitch) of the original Fluke case screws?I don't want to jam random screws into those old plastic posts. I plan to keep the meter.

author: vsmith
author_rank: Regular Contributor
timestamp: October 27, 2019, 10:05:58 pm
content: HiThat auction site has a seller "a-fluke" who has those screws in sets of three or four for a few bucks. (No connection) I believe the screws are an #5 with a 14 pitch, which is a combination that doesn't seem to occur much in hardware stores, at least I haven't ever found them. I have bought his screws, and they are the right ones.

author: JFJ
author_rank: Regular Contributor
timestamp: October 27, 2019, 10:34:10 pm
content: The screws are labelled5-14X3/4in the Fluke 70 series service manual:

author: Nusa
author_rank: Super Contributor
timestamp: October 27, 2019, 10:45:46 pm
content: Thanks guys. Question answered.

author: MosherIV
author_rank: Super Contributor
timestamp: October 28, 2019, 07:57:16 am
content: Hi.I tried to buy the screws from Fluke in UK.First, they do not deal with general public, have to use dealer.Second, they only supply them in bags of 100Good luck.

author: iRepairElectronics
author_rank: Contributor
timestamp: October 28, 2019, 05:55:05 pm
content: Be careful with tightening those bad boys. i have one and its too easy to strip them with too much torque.

author: Electro Detective
author_rank: Super Contributor
timestamp: October 28, 2019, 09:54:24 pm
content: Use whatever thread style screws fit in there easily, and snugly on that last 'careful with not too much torque' turn,and don't stress about sourcing those cheapass penny pinching Fluke self crapping screws with agro threads that bite into the plasticwhich canWILLeventually crack the posts after a few battery swaps or overpriced fuse replacements,no matter what careful, documented method used, be it by a seasoned pro who starts the screwing/seating process backwards first,or the tradie/DIY numbskull with their new cordless impact drillQuote from: MosherIV on October 28, 2019, 07:57:16 amThat's worthy of The Finger x2, why don't Fluke just say "NO, buy a new meter" and be done with it'general public'? what happened to 'customers' that pay quicker than corporats ?and what price that bag of 100 ? same price as 50 new meters ?

author: artag
author_rank: Super Contributor
timestamp: October 28, 2019, 10:04:01 pm
content: Quote from: Electro Detective on October 28, 2019, 09:54:24 pm^^^ this.Don't do it any other way.
New Rigol DS1202Z-E 200 MHz, 2 Channel Oscilloscope for €339 - Page 1
Forum section: electronics / testgear

author: Martin72
author_rank: Super Contributor
timestamp: October 28, 2019, 08:32:32 pm
content: New 200Mhz scope from rigol:https://www.rigol.eu/DS1000Z/Aha.....First thought : Why only 2 channel….

author: Fungus
author_rank: Super Contributor
timestamp: October 28, 2019, 08:44:32 pm
content: There's already a thread on this:https://www.eevblog.com/forum/testgear/rigol-ds1202z-e-entry-level-scope-(200mhz-2-channel)/Quote from: Martin72 on October 28, 2019, 08:32:32 pmSeems to me they're just filling a gap in their lineup. Everybody else has a 200MHz, 2-channel 'scope, Rigol doesn't.This one seems like too little, too late though.

author: Martin72
author_rank: Super Contributor
timestamp: October 28, 2019, 08:45:48 pm
content: QuoteAh, don´t recognize it - My thread can be closed.
SIGLENT SHS-806 HANDHELD OSCILLOSCOPE - Page 1
Forum section: electronics / testgear

author: GerryR
author_rank: Frequent Contributor
timestamp: October 29, 2019, 02:44:58 pm
content: Tried searching for some user info on this 'scope and got 0 hits. Any user comments on this style scope? I service industrial machines and control systems and thought the battery operated handheld unit would be pretty nice, if its performance is good. The 806 is a 60 MHz unit; I understand that they make 100, 150 and 200 MHz units, as well. Comments from anyone having one of these units would be appreciated.

author: tv84
author_rank: Super Contributor
timestamp: October 29, 2019, 03:21:27 pm
content: Search for "SHS806".

author: GerryR
author_rank: Frequent Contributor
timestamp: October 29, 2019, 03:56:30 pm
content: Thanks; I did that but didn't capitalize "SHS." I have all the info I need now!
HPAK 54845A fails calibration with "tail adj" - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: October 28, 2019, 06:21:02 pm
content: Never seen this failure before. Scope is now repaired. It had a bad A150-0005 RF relay in the attenuator which was causing problems @ 20mV/DIV and below and was replaced, then after repairing the attenuator it was getting this error. Turned out to be a bad A/D converter. I'm curious if anyone has any insight as to what "tail adj" means?The affected channel appeared to be working perfectly, otherwise.

author: JDubU
author_rank: Frequent Contributor
timestamp: October 28, 2019, 06:55:03 pm
content: Maybe there is an adjustable current source in an input differential amplifier?See "Long-tailed pair":https://wiki.analog.com/university/courses/electronics/text/chapter-12
Keithley 6485 Analog Output - Page 1
Forum section: electronics / testgear

author: khupys
author_rank: Newbie
timestamp: October 30, 2019, 10:32:08 am
content: I am using Keithely 6485 picoammeter with +-2V analog output per full scale input.As the manual says, the output voltage should be bwteween -2 and +2 V, but our measurement shows it is around 3.7 V.It does change with the reading but only decreases down to around 3.4 V at full scale display at the front panel?Other functions seem to be working OK.What could have gone wrong with this 6485?Any idea ?Thanks~~!
Legible test gear schematic in The Outer Worlds game? - Page 1
Forum section: electronics / testgear

author: jeremyabel
author_rank: Newbie
timestamp: October 27, 2019, 12:52:35 am
content: I was playing thru a game that just came out called The Outer Worlds, and I was struck by this entirely legible and legit-looking schematic that was on the wall. Looks like a waveform generator from some modular test gear, on account of the 17-pin card edge connector? Any idea where it comes from? I'm not up on older modular test gear, are there any that used a 17-pin card edge connector?

author: Thebrakshow
author_rank: Newbie
timestamp: October 27, 2019, 06:49:32 pm
content: looks like aMoog 901BVCO.Hereis a schematic of it.EDIT:Looking at this schematic makes me want to build one just for fun

author: jeremyabel
author_rank: Newbie
timestamp: October 27, 2019, 07:35:24 pm
content: Ha, nice spot! I'll keep my eye out for other schematics, it'd be real funny if they put an entire Moog modular schematic in the game, that'd be fantastic.

author: Kean
author_rank: Unknown
timestamp: October 28, 2019, 04:46:39 am
content: Quote from: Thebrakshow on October 27, 2019, 06:49:32 pmInteresting that they changed the font, and otherwise made it look more hand-drawn - and yet they kept a couple of marks/stains from the PDF/scan in the lower left area above the transistor bottom view and near C5.
rd6006 a dps3003 successor?  - Page 1
Forum section: electronics / testgear

author: finos
author_rank: Contributor
timestamp: October 26, 2019, 09:54:03 pm
content: Hello evrybody from Greecei noticed that RDtech reliced a new suplyfound it on ali expreshere are the specsthe product page has some bigh fat clames ...also the front panel reminds me of the atten psu that Dave reviewedwhat are your thughts about this ? its is a goov value ?is it worth to be called successor?

author: sn4k3
author_rank: Frequent Contributor
timestamp: October 27, 2019, 01:50:11 am
content: Interface looks a lot better and more usable no doubt. Nothing worse than bad and painfull UI where you avoid to use it.Also interested on some reviews, watching
Elector Electronics 1.2GHZ Frequency Counter 1992/93 :  PC Software  User App??? - Page 1
Forum section: electronics / testgear

author: dazz1
author_rank: Frequent Contributor
timestamp: October 27, 2019, 02:12:49 am
content: HiI have an old Elector 1.2GHz Frequency counter I built in the 1990s.https://www.elektormagazine.com/magazine/elektor-199212/32728It can be driven through the serial port. That would be really good because the user interface is rubbish.https://www.hobbielektronika.hu/forum/getfile.php?id=290619Does anyone know if someone wrote a user application to drive the frequency counter?Dazz
Keysight BenchVue 2019 FREE + Too Expensive at same time ! - Page 1
Forum section: electronics / testgear

author: EE-digger
author_rank: Frequent Contributor
timestamp: October 26, 2019, 09:46:11 pm
content: I discovered by accident this week that BenchVue applications for certain instruments has a free, perpetual license !At work, I bought another 34465A a few months back and needing more control than the old, "cherished" DMM Connectivity can provide (i.e. high speed DIGI support), I sprung for a perpetual transportable license last month.Talking to support this week about a DHCP problem, I discovered that with 2019 IOLibraries and 2019 Benchvue installed, an instrument purchased this year will be able to redeem a free perpetual license.This is awesome (thank you Keysight)and I'm able to give the paid-for license to my associate who needs it.Here's theTOO EXPENSIVEpart.I loaded the SA app to see how it handles my PSA spectrum analyzer. It does just ok but is quite basic. I wrote a remote interface last year and have main functions working, along with a 1 second live screen across the LAN. I program at tinkerer level, having left software and firmware behind some years ago. It will run rings around the SA app and cost only spare time ... I know, not necessarily cheap or availableTo my surprise, when I checked the price on the SA app, it was$2300for a perpetual, transportable license ! ! ! !I know Daniel is Mr. Scopes, but hope he can pass along my thoughts on this. There is no way I would pay this kind of money for so basic a utility ... not at work, not at home. The same applies for the Scope APP if it's any more than the DMM license.The DMM perpetual cost $300+, not all that bad and transportability is fairly easy. Now I'm afraid to look at the Scope APP. Also, the DMM app had a full page and a half of purchase options. Really ??BenchVue has made some moves in the right direction over the years, including a bit more stability. The licensing structure and pricing is NOT going to improve things.Almost forgot ... I should mention that I also tried to license the Scope APP for an MSOX I bought two months ago from the Keysight ebay store. This was wishful thinking on my part since the instrument is Keysight used, not new. My license redemption was rejected.
Questions regarding uCurrent's rail splitter subcircuit - Page 1
Forum section: electronics / testgear

author: argintviu
author_rank: Contributor
timestamp: October 26, 2019, 10:01:38 pm
content: Hi all.Soon I'll have to measure some low currents for a microcontroller project and I was looking at Dave's uCurrent. While searching for info about it on Youtube I saw EEVblog #1057 where Dave talked about an issue with oscillation generated by the LMV321 virtual ground / rail splitter.Is it really necessary to use an op-amp to split the rail? From what I gather an op-amp at unity gain is very sensitive to capacitive loading. Couldn't a simpler circuit be used to generate the rails? (like the one in the attachment).The uCurrent device doesn't really have to supply any current since its "load" is high impedance, so the rails don't run the risk of getting unbalanced. Does having a feedback mechanism and tight regulation of the VGND node (like in the original design with the LMV op-amp) be worth all the trouble or can a simple buffer suffice for this application?

author: Kleinstein
author_rank: Super Contributor
timestamp: October 26, 2019, 10:23:20 pm
content: Transistor rail splitters tend to need more current. Also don't forget that even just an emitter follower can oscillate with capacitive load.There is a solution to avoid the oscillations - it is the missing capacitance at the splitter, not so much the capacitive loading that is the problem.The µ-current is nice for relatively large currents. For really small current (e.g. < 1 µA) a TIA based solution may well be the better way.

author: argintviu
author_rank: Contributor
timestamp: October 26, 2019, 10:46:05 pm
content: I see. So going simpler still has its drawbacks. I guess that after all, the original circuit is the way to go, with the addition of a cap on the lower divider resistor.Thanks for the suggestion regarding the TIA for low currents. For now I am just learning and my projects are not that low power, no need to dwelve in the nano scale yet, but I'll keep it in mind for the future.
Hantek 2000 Series Operation - Page 1
Forum section: electronics / testgear

author: SirBrian
author_rank: Newbie
timestamp: October 24, 2019, 02:04:53 pm
content: I deleted my previous post because I found out that I downloaded the wrong update from Hantek.It's possible if you are not careful.Since then I have had the Opportunity to use the 2D72 scope in the field.There is a little cross talk between the input channels but it is tolerable to me. After all it is a cheap scope and I only need it to verify signals look decent. I would not consider this in any way to be a bench scope. Since it only comes with one scope probe I think Hantek meant it to mostly be a single channel scope.I have used it to verify DMX signals at a jobsite and it was very useful for that.I also used the signal source the make a TDR (Time Domain Reflectometer). The signal has a fast enough edge to do this. I used channel 1 as the monitor and channel 2 as the trigger.The source has an output impedance of about 50 Ohms so I added another 62 Ohms as the separator to the test cable. I tested a 110 Ohm DMX cable and was able to see the open end reflected back. Got a good reflected signal, see attachment and correlated the reading to the delay rating of the cable of about 1.3nS per foot.Also has a decent DVM which makes for one less piece of equipment to drag around.

author: Eltax1693
author_rank: Contributor
timestamp: October 25, 2019, 04:11:11 pm
content: HelloYou can always post your request here:https://www.eediscuss.com/forum.php?mod=forumdisplay&fid=45