hybridfree/eevblog-posts huggingface dataset:
FNIRSI 1C15 Handheld Scope - Page 1
Forum section: electronics / testgear

author: EEVblog
author_rank: Unknown
timestamp: February 16, 2021, 11:02:21 am
content: An update to the 5012H, sent into the mailbag.TeardownClaims 110MHz, but again only a dual 100Msps converter the MXT2088

author: tautech
author_rank: Super Contributor
timestamp: February 16, 2021, 11:31:53 am
content: Any better than 50mV/div sensitivity on this one ?

author: Fungus
author_rank: Super Contributor
timestamp: February 16, 2021, 11:59:21 am
content: Quote from: EEVblog on February 16, 2021, 11:02:21 amOverclocked?

author: ataradov
author_rank: Super Contributor
timestamp: February 16, 2021, 05:33:07 pm
content: They switched to ST micro instead of GD. So they are probably not overclocking it. Probably don't need to with external memory.But generally, I would assume it has the same crap performance as the old one.

author: EEVblog
author_rank: Unknown
timestamp: February 16, 2021, 10:45:40 pm
content: Quote from: tautech on February 16, 2021, 11:31:53 am20mV/div lowest, have not tested it

author: EEVblog
author_rank: Unknown
timestamp: February 16, 2021, 10:46:51 pm
content: Quote from: ataradov on February 16, 2021, 05:33:07 pmSeems to. Still wobbly performance on anythign over like 20MHz or so. They are equivalent time sampling again

author: Aiy
author_rank: Regular Contributor
timestamp: February 17, 2021, 06:43:51 pm
content: In the video I think Dave had the trigger point (T) all the way to the right in the display when doing the high frequency measurement ( see video at 38.53https://youtu.be/QKdLP1cP3Dg?t=2333), not sure if that was on purpose but it could explain the jittery-buggery going on. I'm guessing this device does not have a good base oscillator.Best regards
Need to reset Hameg HM5014-2 - Page 1
Forum section: electronics / testgear

author: teddychn
author_rank: Regular Contributor
timestamp: February 18, 2021, 10:02:38 am
content: I have a HM5014-2 and it's rotary encoder seems doesn't work. The screen lookedvery dard. I'd press some combination keys and power on at the same time. In thatway could restore the settings back to factory default and the screen brightneesbehaves normally. But today, I bumped up the same issue again and forget the keys I'dpressed before.Does any one know the trick to reset this spectrum analyzer. I can't find the answer ineither user's manul or service manual.Thanks!
looking for Lecroy DA1855A Schematic - Page 1
Forum section: electronics / testgear

author: mightyohm
author_rank: Regular Contributor
timestamp: February 17, 2021, 01:04:54 am
content: Has anyone seen a schematic for the Preamble/Lecroy DA1855A? The old preamble manuals have a block diagram but neither of the manuals I have include a schematic.Would love to see a teardown of this venerable instrument as well.
Audio Precision Portable 1+ issue - Page 1
Forum section: electronics / testgear

author: jsantoro
author_rank: Regular Contributor
timestamp: December 15, 2018, 05:56:18 pm
content: AP portable 1+Fails self test on 7.0a and 7.1b, residual noise test for L+R respectively.Limit is 1 uV and it's showing 3uV. I remember reading somewhere that this is caused by stray noise or environmental but I just can't recall. Thinking of taking a chance and purchasing but it appears service manuals are scarce. V1.0 firmware also.Anyone familiar with this model? Opinions?Thanks,Jim

author: blackdog
author_rank: Frequent Contributor
timestamp: December 15, 2018, 07:18:07 pm
content: Hi jsantoro,I have the same unitBe shure you place the unit in a clean EMC spot, say a table 1 a 2 meter around no other equipment and test again.Kind regards,Bram

author: boB
author_rank: Frequent Contributor
timestamp: December 15, 2018, 07:26:06 pm
content: Check the spectrum of the noise to get an idea

author: jsantoro
author_rank: Regular Contributor
timestamp: December 17, 2018, 01:24:41 am
content: Thanks for the ideas.

author: Glubb
author_rank: Newbie
timestamp: February 16, 2021, 01:15:44 am
content: Hello,Happy new year (even if it's a bit late...).I'm trying to fix an AP portable one +. I think some resistors network are dead, but I can't read the reference on them, does anybody who has an AP Portable can help me by opening the analyzer and see the references of the four resistors networks numbered on the attached image ?Thanks a lot for your help.RegardsEmmanuel
keithley 2450 questions - Page 1
Forum section: electronics / testgear

author: analogNewbie
author_rank: Regular Contributor
timestamp: February 15, 2021, 03:26:21 pm
content: I just got a keithley 2450. This unit is working OK.I have 2 questions regarding this unit.1) When the power of the unit is turned off but the power cord is plugged in, the internal relay sometimes clicks. Does anyone know what it is doing? How to disable it?2) There is some bias current at current model, is a way to null the bias current at Ohm mode? (K6517A have this kind of configuration. To use REL value of current mode in Ohm mode.)Thanks

author: jjoonathan
author_rank: Frequent Contributor
timestamp: February 15, 2021, 06:08:09 pm
content: Spooky ghost calibrations?
Rigol hack inc signal generator? - Page 1
Forum section: electronics / testgear

author: animalbeats
author_rank: Newbie
timestamp: February 15, 2021, 02:09:59 pm
content: HiCan you hack a non S model Rigol to include a signal generator?

author: TurboTom
author_rank: Super Contributor
timestamp: February 15, 2021, 03:15:07 pm
content: I guess you can if you somehow duplicate theSG piggyback boardand figure out how to calibrate it...
Tektronix 2230 display problem - Page 1
Forum section: electronics / testgear

author: frankcolak
author_rank: Newbie
timestamp: February 22, 2014, 11:52:45 pm
content: Hi all!New to the forum and hope someone encountered a similar problem.When I start the scope up it shows the trace and switches over to what looks like a calibration display after about two seconds or sometimes immediately. I have only had it for a couple of days. Worked fine twice so far. I will try to attach an image.Went through the manuals quickly but no luck. Will do some more thorough reading.Seems like an error condition of some sort.Frank

author: Y-station
author_rank: Newbie
timestamp: February 15, 2021, 12:59:59 pm
content: I had the same problem. This is what you get if you power up with one of the MEMORY switches pressed. It is easy to check by measuring the voltages at the inputs to U9301 and U9302 or at the switches themselves. It is easy to fix with switch cleaner and by operating the switches a few times.David
Datron 1271 or 1281 displays (Itron DC405E2)  - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: July 05, 2017, 05:28:52 pm
content: A friend has a 1281 with both VFDs open to air.Does anyone have any spare? Or have built a replacement using modern VFD or LCDs?Dave

author: pelule
author_rank: Frequent Contributor
timestamp: July 11, 2017, 07:13:34 pm
content: HiI assume you have posted same request at [volt-nuts]I had same problem some years ago, both 1281 displays have been brocken during shipment.You may find the posts here in the forum:https://www.eevblog.com/forum/repair/looking-for-datronwavetek-1271-or-1281-display-unit/msg499126/#msg499126For the left value/mode display I have not yet found a solution, but I guess a graphic display with fitting length and heigt would be the best.For the right menu/control display I have found a suitable display, but id would need a voltage converter to 5V and a MCU, which converts the serial graphic information into a graphic display controller format. I have started the sw design, but than I was lucky to get a complete worlking display board for a low budget and so I stopped working on.You can find the so far result at following site:https://xdevs.com/fix/d1281/Rear view:lFront view:PS / Added: I did the Itron communication trip already (even with Japan direct). No chance to get NOS parts. Both where custom displays. Best result: I got the data sheet of the DC405E2, which Todd Micaleff posted at his xDevs 1281 repair site./PeLuLe

author: picburner
author_rank: Frequent Contributor
timestamp: February 16, 2021, 08:38:46 am
content: I understand it's been a long time but, if you haven't thrown away the instrument yet, now there is a chance to have at least onealternative display.
121GW Multimeter - OoS - Page 1
Forum section: electronics / testgear

author: PerranOak
author_rank: Frequent Contributor
timestamp: February 18, 2021, 05:35:08 pm
content: Hi,Dave's multimeter has been out of stock for ages.Any idea of when it'll be back?Cheers.

author: Uncle Bob
author_rank: Newbie
timestamp: February 18, 2021, 11:33:18 pm
content: Hi,Welectron (Germany) appear to have it in stock if you are in a hurry.

author: tautech
author_rank: Super Contributor
timestamp: February 18, 2021, 11:50:11 pm
content: As Joe Smith had a lot of input back to Brymen before release of Daves new DMM it might be a better option and it's certainly cheaper:https://simonselectronics.co.uk/product/bm786-eevblog/

author: PerranOak
author_rank: Frequent Contributor
timestamp: February 20, 2021, 09:58:23 am
content: Cheers both.
jbc hd-2b station - Page 1
Forum section: electronics / testgear

author: peter2
author_rank: Contributor
timestamp: February 14, 2021, 07:04:21 pm
content: i have a hd-2b jbc station,and i want parts for the stand (numbers).has any the exploded view with the part numbers for order.a parts nummer list for all the jbc stuff are very welcome.any have the partlist and pricethanks
Should I buy a JBC CD-1BQE ? Opinions on the DR560 ? - Page 1
Forum section: electronics / testgear

author: lame_turtle
author_rank: Contributor
timestamp: September 14, 2020, 07:18:47 pm
content: Hello,Trying to decide on buying a soldering iron, my budget is 800€ tops and I would need a soldering iron and a desoldering iron (pump) but I understand the budget is tight for both.I can find the JBC for 360€ right now, but I understand jbc has discontinued and replaced the iron with a not yet released one which I guess will be far more expensive than 360.The price on the jbc seems really good to me and leaves me a good space till 800€ to buy tips.Is there a better choice at this price point ? Maybe a station that could take a desoldering iron too ? Should I wait for the new model ?Thank you for any input

author: lame_turtle
author_rank: Contributor
timestamp: September 29, 2020, 07:06:20 pm
content: Update: So I decided to spend the money for the whole set and buy a jbc DDE station with a dr560 for desoldering .There are not a whole of reviews on the dr560 and some people even say a hakko fr would be better or easier to use.Anyone here having real world experience and has compared with another desoldering tool ?Please any input would be greatly appreciated.

author: perieanuo
author_rank: Frequent Contributor
timestamp: September 30, 2020, 01:08:18 pm
content: hi,I recently got JBC 2bqe, it's excelent .I worked with metcals for 2 years in a shop (hand soldering, I had 3 stations on the bench) and other stuff along 2 decades (at least 5 other lower cost soldering irons, including one manufactured by a company I worked based on the sl30 but portable, 12-24VDC).well, the 2bqe gives almost the same result as double-priced metcals, that's why I bought one for myself, sometimes I need to push real heat power into large ground planes.you choosed well with jbc.

author: peter2
author_rank: Contributor
timestamp: February 14, 2021, 06:58:58 pm
content: yes,the jbc dr560 are very nice to handle.i have one,at home for desoldering.weller dsx120 desolder are very small,and i must always make it emty.the heating element are inexpensif 125 euro weller are about 250 euro.the jbc has a better grip ,and the pump are very good,i like it.It is very mutch money,but nice,and a lot of tips ,for your needs.
Standard Research SR760 FFT Spectrum Analyzer - CRT Sync Issue - Page 1
Forum section: electronics / testgear

author: laceypaul
author_rank: Newbie
timestamp: February 11, 2021, 08:01:35 pm
content: I have a SR760 FFT Spectrum Analyzer. Once warmed up all is good, but for the first 5 minutes or so, the CRT display has a sync issue. Standard Research have not been very helpful with circuit diagrams etc. so wondered if anyone has any ideas?ThanksPaul

author: PA0PBZ
author_rank: Super Contributor
timestamp: February 14, 2021, 11:50:51 am
content: Check for dried out electrolytic capacitors in the monitor module.

author: nctnico
author_rank: Super Contributor
timestamp: February 14, 2021, 12:24:57 pm
content: Freeze / cold spray is a good tool for finding which part is the cullprit. Many times the problem is in electrolytics going bad but not necessarily.
Advice to affordable Oscilloscope Probes for 100 MHz scope - Page 1
Forum section: electronics / testgear

author: nightfire
author_rank: Frequent Contributor
timestamp: February 14, 2021, 12:13:24 am
content: As I want to complete my little workbench in the making, I feel a Rigol 1102Z-E smiling at me from the shelf at the supplier- at least for the current price it is a very affordable 1st scope for the first steps...Supplied are PVP3150 probes. As I suspect that those are a bit on the budget side, given the overall price of the unit, what are the experiences of folks that already used them?Is it worth to unpack and use them, or should I leave them packaged (and waiting until I probably will sell that scope in a year or so on ebay and get me a bigger one)?A probe that is easy to come by here in germany could be a Testec TT-MF-312.Any comments or tips regarding this?

author: ataradov
author_rank: Super Contributor
timestamp: February 14, 2021, 12:48:16 am
content: Those probes are fine. For 100 MHz scopes, even dirt cheap TP6100 perform fine.There is really no point in paying more unless you have specific complaints.

author: penfold
author_rank: Frequent Contributor
timestamp: February 14, 2021, 12:59:07 am
content: I've no experience of Rigol probes but I can vouch for the Testec probes, great value for money, my set have lasted a good few years with no problems at all so they're certainly robust (I much prefer them over the basic Keysight probes if that's any useful comparison).

author: ferdieCX
author_rank: Regular Contributor
timestamp: February 14, 2021, 02:06:09 am
content: I have a set of Testec MF-212 since 2010, they are very good.
Analogue discovery pro  - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: February 14, 2021, 09:15:50 pm
content: Not sure if anyone has seen this?https://store.digilentinc.com/analog-discovery-pro-3000-series-portable-high-resolution-mixed-signal-oscilloscopes/https://youtu.be/-lMlnb6_Kdw
Alternative work-a-like to the Analog Discover 2? - Page 1
Forum section: electronics / testgear

author: three_jeeps
author_rank: Contributor
timestamp: February 13, 2021, 09:03:49 pm
content: I've played with and like the concept of the Analog Discovery 2.I am wondering if there is a similar product out there with some better specs, for example, 100MHz scope, deeper memory, 2 GHz spectrum analyzer, etc.Alternatively, perhaps there are 2-3 instruments that together, have similar functionality but better specs, for around the $500-$600 USD price (total).Pointers/suggestions appreciated.J

author: Electro Fan
author_rank: Super Contributor
timestamp: February 13, 2021, 09:06:21 pm
content: Similar thread here:https://www.eevblog.com/forum/testgear/i-recommend-choosing-a-combo-oscilloscope/
Optimation Model AC 110 ACV calibrator - Page 1
Forum section: electronics / testgear

author: maginnovision
author_rank: Super Contributor
timestamp: March 23, 2019, 08:08:41 am
content: I bought this ACV calibrator on your favorite auction site and the 100V and 1KV ranges have no output, but it works otherwise or so they say. Does anybody know anything about this instrument or have any documentation? I should be able to get it going anyway but it'll be much easier and faster with some idea of what it is. Maybe another relevant question is how do these types of calibrators typically work?

author: Vgkid
author_rank: Super Contributor
timestamp: March 23, 2019, 04:21:29 pm
content: Tear it down and take lots of pictures. For a manual try the manual_exchange user group , or try contacting ohm-labs(it is a long shot, they bought jrl, which was the owner of optimation). For a guess on how it works, look into the fluke 5200a. Fluke called into using your optimation unit in the calibration procedures in a much older ac standard.

author: maginnovision
author_rank: Super Contributor
timestamp: March 27, 2019, 11:06:51 pm
content: Well I think I've got it. Requires you to supply both 100v and 1000v through a power amp of some sort. Good news is it found a good home in my trash. No output at terminals, nothing obviously wrong with it.

author: 1audio
author_rank: Frequent Contributor
timestamp: February 13, 2021, 07:05:27 pm
content: I'm sorry I did not see this earlier. I have a set of manual for the AC110 and one mostly working example. It would be 50 years old so no surprise that there may be issues.I'm working on mine so I'll collect some pictures and post some details.
Instek GSP-810 spectrum analyzer setup menu - Page 1
Forum section: electronics / testgear

author: maxcy
author_rank: Newbie
timestamp: February 12, 2021, 04:50:06 pm
content: In this spectrum analyzer the user manual mentions a setup menu where several functions can be tested to ascertain that the instrument is working. One particular test, the cal test, puts out an 80MHz test signal to show up in the display and confirm that the frequency is correct. But, nowhere can I find any mention of the output signal level in dBm as shown on the display!! Spectrum analyzers measure frequency and signal level. I am seeing a level of -50 dBm, and would like to ascertain that this is the correct measurement. Can anyone affirm this? I would like to confirm that this instrument is working up to spec, especially the attenuation.73 wt1v
Amplifier Research Fieldprobe Charger / Fiber Converter - Page 1
Forum section: electronics / testgear

author: wilhe_jo
author_rank: Regular Contributor
timestamp: February 11, 2021, 02:21:41 pm
content: Hi!I got some AR Isotropic Field Probes (FP5000 and FP2080) for a very good price.The caveat was, there's no charger included, and I do not have any Field Monitor to interface to them.Well, the charger is just a 3 Cell NiCd charger and the interface is described in the manual briefly.The wavelength is missing, but I guess I need to open them up to change the batteries anyways because the probes were "in transit" for a month with the switch set to "ARM"...The PCB is done and will be ordered in the next weeks together with some "commercial" PCBs.It consists of just a LT4060 charger, which can do NiCd and NiMh, and a MCP2221 usb-serial chip together with a Avago Transmitter/Receiver.If someone else needs a charger and/or interface for these probes, I could order some more of these boards.Oh, I forgot, if someone knows something about the wavelength used, I'd appreciate thatI guess it will be just the usual 650nm but who knows...Looking around in ARs website, I got to the operating/service manual of the 10000W1000A amplifier (https://www.arworld.us/post/opMan/10000W1000A%20Manual.pdf)If you look into section 2.5.2.3, you'll find the specs for their fiber optical interfaceSo it's 820nm, and they suggest the Avago HFBR series.73

author: wilhe_jo
author_rank: Regular Contributor
timestamp: February 11, 2021, 06:37:07 pm
content: Ok, I couldn't wait and opened both sensors up (I'll post some photos later on...).Both batteries were dead-as expected.1 pack is discharged to 0V - the other one has some 0.5V left (remember, that's 3 cells!).So I guess, changing them is a pretty good idea.Somebody put a label on the one sensor. It suggest, new batteries in 2019.The other has a date written on it. It says April 2012.That one is a little leaking I guess... it has some white crust on it.I looked around and on some parts of the PCBs I see some white residue as well.It might be potassium hydroxide or just leftovers from the PCB cleaning... it looks similar to what IPA leaves behind...Any thoughts if I should clean these or not?I mean, there was no contact between the battery and this PCB.From my experience, corrosion from leaking batteries is around the battery since the electrolyte creeps along the surface.My intuitive guess would be to leave it as it is... or is this a bad idea?I mean rubbing around on some 18GHz components without any need is not too brilliant either, right?Another question is if I should order NiCd or NiMH...As I mentioned, my new charger will do both chemistries.So if there's no real drawback that I overlooked, I'd "upgrade" to NiMh.73
Keithley 6517b analog output noise RMS? - Page 1
Forum section: electronics / testgear

author: kitkatbandit
author_rank: Newbie
timestamp: February 11, 2021, 05:38:30 pm
content: Hi Y'all,I am trying to figure out what the noise characteristics of a Keithley 6517b are and since I dont have one, I wanted to reach out to those that might have access!I use a range of other ammeters now for doing electrochemistry and noise is THE critical factor here (well...that and fast sampling).To get the fast sampling rate, I would need to use the back analog output. The problem I am facing (and why I cant look at the spec sheet) is that the data provided by Keithley is referring to the peak to peak variation on the front panel display.Has anyone hooked up the "Pre-Amp output" on the back panel to an oscilloscope and looked at the RMS noise (either in raw Vrms, or converting to Irms)?Thanks!K
Rigol DS1052E 100MHz mod worth it? - Page 1
Forum section: electronics / testgear

author: MikeK
author_rank: Super Contributor
timestamp: February 11, 2021, 03:53:33 am
content: I've had my scope for years and finally did the 100MHz mod. Okay, sure, I can now zoom in to 2ns, but I never needed that depth. I was able to accurately probe a 110MHz signal before the mod...The scope was accurately calculating the frequency. And that was about the limit; any higher and it couldn't handle it. And now that the mod is done, it's the same. Still nothing better than 110MHz. So what did I gain from the mod, besides the 2ns depth? Shouldn't 100MHz be the 3dB point? Shouldn't I be able to at least get some higher frequency, albeit with some attenuation?-Mike

author: Fungus
author_rank: Super Contributor
timestamp: February 11, 2021, 10:03:54 am
content: The 100MHz mod only changes the -3dB point. You'd see a 110MHz before but it would have been more attenuated.If you only look at pure sine waves then you won't see a huge difference but a high frequency square wave should now look more square than it did before.Was it worth doing? That depends on what you look at with your 'scope. Changing the ratio of sample rate to -3dB point also has consequences (although 1Gs/s is still plenty for a 2-channel 100MHz 'scope).

author: MikeK
author_rank: Super Contributor
timestamp: February 11, 2021, 02:21:16 pm
content: Okay, so if I could see a 100MHz signal on my *then* 50MHz scope...Shouldn't I be able to see a 150MHz or 200MHz on my *now* 100MHz scope (just with attenuation)? Because it still craps out at about 110MHz.

author: Fungus
author_rank: Super Contributor
timestamp: February 11, 2021, 02:33:45 pm
content: Quote from: MikeK on February 11, 2021, 02:21:16 pmTheory says: If you feed it a pure sine wave via 50-Ohm terminated BNC cable it should gradually attenuate as the frequency rises, reach -3dB at 100MHz, and start "crapping out" at about 400MHz (ie. 1GHz / 2.5).If it "craps out" before 400Mhz then it's due to your probes or something else.nb. Most 'scopes have a bit of extra headroom so -3dB is likely to be at 120Mhz or around there.

author: MikeK
author_rank: Super Contributor
timestamp: February 11, 2021, 02:54:34 pm
content: It could be my DDS signal generator. When I got to 150MHz, the 'scope showed a good signal again. I'll have to dig deeper.Thank you.-Mike
Velleman HPS10 scope not working - Page 1
Forum section: electronics / testgear

author: ocset
author_rank: Super Contributor
timestamp: February 09, 2021, 10:00:19 pm
content: Hi,Going to try and open it up tomorrow. The probe seems OK..it reads 9MEG. The LCD display works fine....but i cant scope anything. The LCD display just shows 50Hz noise on it. I reckon the internal 1MEG is blown because maybe someone connected it to mains?.....do you agree this is the most likely reason its not working? Or are there other common faults with this scope?https://www.velleman.eu/images/tmp/HPS10%20TD%20V1.1.pdf
nScope - Page 1
Forum section: electronics / testgear

author: Cujo
author_rank: Regular Contributor
timestamp: February 14, 2021, 02:14:31 am
content: What is your opinion on nScope as a mini all in one lab for a electronic engineering student with no money for fancy equipment? Should I get this, or is there any other recommendations?https://www.nscope.org/

author: tautech
author_rank: Super Contributor
timestamp: February 14, 2021, 02:58:37 am
content: Save up for a proper DSO if EE is to be your career.

author: ledtester
author_rank: Super Contributor
timestamp: February 14, 2021, 04:03:14 am
content: I'd keep my eye out for a used Analog Discovery 1 on ebay. You might be able to pick one up for < $150.Or get a used Analog Discovery 2 if you can afford it.

author: MarkF
author_rank: Super Contributor
timestamp: February 14, 2021, 04:12:05 am
content: Or one of the Picoscopes if you can not afford the Analog Discovery.https://www.tequipment.net/Pico/2204A/PC-Based-Oscilloscopes/?v=0Oh, and you can also try the software before buying the hardware if you want to see how it works.

author: beanflying
author_rank: Super Contributor
timestamp: February 14, 2021, 06:06:01 am
content: Quote from: Cujo on February 14, 2021, 02:14:31 amI made do with a Cruddy Hantek 20Meg Scope/LAeBay auction: #183730457950for a long while. Sold it a while back for $50AUD. Software is a little cludgey but it got done what I needed at the time. Likewise I made do with a Feeltech FY6600eBay auction: #324221631097function generator (sitting in the cupboard $50 if you are interested) for a few years before dropping some more serious $.Where in Oz are you? Someone close by might have and old 20meg analogue scope going cheap/free. I have a doorstop to move on....

author: Cujo
author_rank: Regular Contributor
timestamp: February 14, 2021, 08:58:12 am
content: Quote from: ledtester on February 14, 2021, 04:03:14 amI really like that one. I will look into that. Dose it have a inbuilt power supply?

author: gnuarm
author_rank: Super Contributor
timestamp: February 14, 2021, 09:48:13 am
content: Quote from: beanflying on February 14, 2021, 06:06:01 amI got one of those once. The durn software wouldn't even run on my PC. Once I read up on it and found the logic analyzer won't run at the same time as the scope it really turned me off and it's sitting in the junk pile somewhere.My understanding is there are any number of better pieces of equipment these days.
Hameg HM7044 usage question -- meter mode and PROG button - Page 1
Forum section: electronics / testgear

author: wpmcnamara
author_rank: Newbie
timestamp: February 14, 2021, 01:55:48 am
content: I recently picked up a Hameg HM7044 as an addition to my bench. I am somewhat befuddled by the PROG button and how it makes the unit behave. The relevant section of the manual is quoted below.The wording, at least in English, is very poor in the manual. What I have figured out is that pressing PROG, followed by SEL, toggles whether the selection mode is automatically ended after this first setting. The manual says "If several changes shall be done for the same channel(s), the automatic termination of the selection mode can be prevented by operating the PROG.-button after the SEL-button . The PROG. LED glows This setting mode can be left by pressing the SEL-button or the PROG.-button again." This certainly doesn't appear to be the behavior.If the PROG LED is lit, and I hit the A button, there is a 5 second pause, then the unit beeps and the display switch to monitoring actual output of the channels, rather than the normal mode of either displaying the set current/voltage for disabled channels and the set values for disabled channels. Further, in this mode, the panel adjustment knobs are disabled. You can still change the set values with direct numeric entry though. The most annoying thing is that I have not been able to figure out how to get back to the other display mode, short of power cycling.So I'm hoping that someone who has one of these units, and it more familiar with it than I, can explain what the PROG key is actually supposed to do. I'm assuming that the manual is just translated wrong, but is there any way to toggle the display back?
I cannot for the life of me find the tequipment discount code thread - Page 1
Forum section: electronics / testgear

author: riyadh144
author_rank: Unknown
timestamp: February 09, 2021, 02:21:50 pm
content: I think I might be losing it.But I have searched google and the forum inside out, I cannot find the thread were you request the tequipment discount code.Does anyone know if that ever existed? if so do you have the link.ThanksRiyad

author: drussell
author_rank: Super Contributor
timestamp: February 09, 2021, 03:31:43 pm
content: Quote from: riyadh144 on February 09, 2021, 02:21:50 pmhttps://www.eevblog.com/forum/testgear/eevblog-members-discount-at-tequipment/

author: riyadh144
author_rank: Unknown
timestamp: February 09, 2021, 06:50:44 pm
content: Thanks
Looking for calibration manual for Digimess/Grundig DM100 - Page 1
Forum section: electronics / testgear

author: Decee1
author_rank: Regular Contributor
timestamp: February 08, 2021, 11:17:30 pm
content: Hello,I got this Grundig DM100 that i am trying to calibrate. Right now it is 7.3mV out of spec which i would like to fix.Anyone got a calibration manaul for it or at least can tell the golden button/command you need to press so i can calibrate the voltage range?It is primarly the DC range i want to calibrate, i don't have any AC reference but i do own a high precision Voltage Reference and 0.05% 10K resistor
Tektronix TDS3052 (TDS3000 Series) PSU Replacment - Page 1
Forum section: electronics / testgear

author: laceypaul
author_rank: Newbie
timestamp: February 05, 2021, 11:58:30 am
content: I have just acquired a Tektronix TDS3052 scope which was dead on arrival. Following the Tektronix Service Manual Troubleshooting section, I have narrowed the fault down to the 15V Power Supply. This is an Artesyn NAN40-7615-01. These are now obsolete. The Artesyn LPS44 PSU would appear to be a suitable replacement, but wondered if anyone has used one of these with successful results?Thanks in anticipationPaul

author: Electrole
author_rank: Contributor
timestamp: February 05, 2021, 01:18:28 pm
content: Hi PaulI have a TDS3014 which had a NAN40-7615 that failed.I replaced it successfully with an NFS40-7615J, RS order no. 629-5636.BR

author: laceypaul
author_rank: Newbie
timestamp: February 05, 2021, 07:51:05 pm
content: Thanks BR. I've just ordered one, so will report back when fitted.Paul

author: Kibabalu
author_rank: Regular Contributor
timestamp: February 05, 2021, 08:17:07 pm
content: A defective power board is not unusual for the TDS3000 series. I had the same fault. User Jay_Diddy_B reengineered the basic parts of the power board and gave some thermal images:https://www.eevblog.com/forum/repair/a-tektronix-tds3014b-with-two-strange-issues/In some cases, so for me, two of the snubber resistors are the reason for the fault. They overheat and one of them burn. It's easy to check and replace them, because they are mounted in THT.Maybe you can save the 40 pounds for a replacement board and buy two 150 Ohm resistors instead.

author: laceypaul
author_rank: Newbie
timestamp: February 06, 2021, 10:21:53 pm
content: Thanks. I checked both sets of series paired resistors, and all was good.

author: laceypaul
author_rank: Newbie
timestamp: February 08, 2021, 08:24:12 pm
content: Fitted the new NFS40-7615J (RS order no. 629-5636). Scope now fully working!! Be careful if you do this mod though. The Live and Neutral pins of the board have been swapped over, so I had to swap the two wires of the mains input cable to the PSU over (easy job, no soldering required). Just as well I checked!!Paul
Using HP 3478a multimeter with EZGPIB (and AR488) - Page 1
Forum section: electronics / testgear

author: wkb
author_rank: Super Contributor
timestamp: February 09, 2021, 06:59:33 pm
content: I am looking for people who succesfully use their HP 3478A multimeter with EZGPIB.Can get it working to an extent, essentially by using a polling loop.But for obscure reasons I cannot get more fancy programs (taken from the examples that come with EZGPIB) to work. E.g. programs that make use of SRQ. I am using the AR488 Prologix clone to connect PC to the HP.With a terminal program I can setup the HP such that SRQ works etc etc. The HP3478AControl program that I found and used to save the calram information works just fine so I have no reason to doubt my hardware.So... anyone out here who has working EZGPIB programs they are using with their 3478A and are willing to share those programs here for the education of yours truly?Much appreciated!Wilko

author: Stray Electron
author_rank: Super Contributor
timestamp: February 09, 2021, 07:21:19 pm
content: You should probably correct the title.

author: wkb
author_rank: Super Contributor
timestamp: February 09, 2021, 07:46:59 pm
content: Quote from: Stray Electron on February 09, 2021, 07:21:19 pmDone, thank you!
Datron 1061, 1061A, 1062, 1071, 1072 Option S81, Option S81A Document - Page 1
Forum section: electronics / testgear

author: TheDefpom
author_rank: Frequent Contributor
timestamp: February 07, 2021, 10:44:12 pm
content: I recently acquired an old service manual and it had an extra document that talked about the S81 or S81A option, which I previously hadn't been able to find information about, so I have taken a couple of photos of it and have included it below in case anyone else is looking for this information in the future.
Finding firmware for a Siglent SDS2072 - Page 1
Forum section: electronics / testgear

author: jscottbee
author_rank: Newbie
timestamp: February 07, 2021, 12:45:56 pm
content: Hi,I'm looking for a download location for the firmware for a Siglent SDS2072. The Siglent site does not seem to have any listed for it unless the later SDS2000X model FW will work with it?Anyone know a location or if the later FW will work?Thanks for any help.Scott

author: tv84
author_rank: Super Contributor
timestamp: February 07, 2021, 12:49:40 pm
content: This one?
ROHDE & SCHWARZ NGP804 4-Chan Bench PSU capable of 80A (800W) - Page 1
Forum section: electronics / testgear

author: bsodmike
author_rank: Regular Contributor
timestamp: February 05, 2021, 12:09:35 pm
content: Hi all,I'm doing some testing with an inverter that runs at 40A and I wanted to have OCP/OVP protection and logging. This is a really quality bench PSU (having watched Dave's videos). I would rather have these protection features than have to rely on Chinese MeanWell type chepo-PSUs and "rely" on their unverified protective circuitry.Just thought it wouldn't hurt to check here on any feedback anyone might have.https://export.farnell.com/rohde-schwarz/ngp804/power-supply-bench-4ch-32v-20a/dp/3287708Thanks again!Cheers M.

author: Fred27
author_rank: Unknown
timestamp: February 05, 2021, 12:49:43 pm
content: There were a couple of reviews of the NGP814 over on Element14 recently.https://www.element14.com/community/roadTests/2208/l/rs-ngp814-power-supply

author: bsodmike
author_rank: Regular Contributor
timestamp: February 05, 2021, 01:57:56 pm
content: The NGP814 is more suited if you wanted a higher voltage output (serially, max 250Vdc).Whereas the NGP804 can provide the max 80A which is handy for PSU designers etc those playing with DC loads etc etc.Another use I will have with the NGP804, serially connecting each 32Vdc PSUx4 = 128V @ 6.25A (staying within the 800W budget), may allow testing a few Nixies here and there

author: bsodmike
author_rank: Regular Contributor
timestamp: February 06, 2021, 11:44:19 am
content: Do you think I should go for the NGP814 instead?I would imagine that only the matching pair of channels can be run in parallel, i.e. 20Ax2 @ 10Vdc (400W) and 10Ax2 @ 20Vdc (400W). So 40A @ 10VDC is the max one can get from this at any time.Alternatively, I suppose one could run Chan 2/3 at 10VDC and get 10x2 + the 40A from Chan 1/2, hence 60A out?Datasheet mentions 40A is max for NGP814.

author: Fred27
author_rank: Unknown
timestamp: February 06, 2021, 11:55:44 am
content: I just mentioned it as it was a review of a PSU from the same series. I wasn't implying that the NGP814 was better suited to your needs that the NGP804.

author: bsodmike
author_rank: Regular Contributor
timestamp: February 07, 2021, 06:44:27 am
content: Hey Fred,Well here's something interesting, I found this from Keysight.https://export.farnell.com/keysight-technologies/e36233a/power-supply-bench-2ch-30v-20a/dp/3052301Max output is 20A at 30Vdc with two internal PSUs at 200W each; so the total parallel output is 40A.One convenience feature is that the parallel mode can be enabled from the menu rather than having to manually wire the two "internal" PSUs together.Another great selling point is that this unit is an entire £1,000 cheaper than the R&S unit.
EEV 121GW multimeter failure. - Page 1
Forum section: electronics / testgear

author: duodiode62
author_rank: Contributor
timestamp: February 07, 2021, 05:21:40 am
content: Hi all. It looks like I am on my own with this failure. I suspect that one or more switches that detect the probe positions have failed, rendering the multimeter useless. I've tried pulling it apart, to see if I can get to the switches, but I can't get the board out. Does anybody know where I can get service information for it; specifically dismantling instructions and a circuit diagram?Cheers, Stuart

author: J-R
author_rank: Super Contributor
timestamp: February 07, 2021, 06:15:46 am
content: There are some good photos here that might help:https://lygte-info.dk/review/DMMEEVBlog%20121GW%20UK.htmlIt should be pretty straight-forward: 2 screws for the battery cover, 4 screws for the back cover (and one clip, careful!), then 2 black screws on the PCB. One is partially under the 10A fuse. Don't remove the 4 screws for the display.At that point the PCB should come out with just a little bit of pulling and wiggling.While all the jacks are split physically, only the amperage jacks have any detection. It's not a physical, insertion switch. It's a detection circuit.Check out the schematic here:https://www.eevblog.com/wp-content/plugins/download-attachments/includes/download.php?id=11618The portion of interest would be the "Input Warning Circuit".

author: J-R
author_rank: Super Contributor
timestamp: February 07, 2021, 06:30:38 am
content: As a side note, you already have another thread for this issue:https://www.eevblog.com/forum/testgear/problems-with-eev-121gw-multimeter/I requested the moderators merge it.You did not respond to the suggestions made in the other thread. Can you provide an update on whether you tried them or not or what other steps you may have taken to correct the issue?
VirtIns Technology DSO-2820R:200MHz 8~16Bit Multi-function PC USB Oscilloscope - Page 1
Forum section: electronics / testgear

author: Larryc001
author_rank: Regular Contributor
timestamp: February 07, 2021, 06:14:49 am
content: Virtins Technology DSO-2820R:200MHz 8~16Bit Multi-function PC USB Oscilloscope Spectrum AnalyzerI have noticed this on eBay and am wondering if it would be worth the money to play with. I would be grateful to hear from anybody one who has experience with one of these. Thanks.Here is the eBay listing. Looks like they have a 4 channel as well.https://www.ebay.com/itm/VT-DSO-2820R-200MHz-8-16Bit-Multi-function-PC-USB-Oscilloscope-Spectrum-Analyzer/111828683278?hash=item1a09824a0e:g:qVoAAOSw-RFaX3Ly
SigLab dynamic signal analyzer model 20-22A / Matlab help and teardown photos - Page 1
Forum section: electronics / testgear

author: kyleaudio
author_rank: Contributor
timestamp: January 31, 2021, 03:26:28 am
content: I recently picked up an old dspt SigLab model 20-22A to try out and I've gotten close but it's not quite there and I'm hoping one of you guys is either familiar with this unit or someone familiar with Matlab can see what's going in. This is the first time I've used Matlab so I'm not sure how to deal with these errors.Right now I can do some of the self tests and I can use the signal generator. When I try to launch other functions such as the oscilloscope, spectrum analyzer, network analyzer, etc. I get errors in Matlab. I've attached an image of the error that I get when trying to launch the oscilloscope.I've contacted Spectral Dynamics who used to sell these and unfortunately they no longer support them. The guy who knew about them has retired.Here's what I've tried so far:- SigLab version 3.2.6 and Matlab version R11 v5.3.0.10183 installed on Windows 98- Siglab version 4.0.0 and Matlab version R2009a installed on Windows XPI get the same errors on both installations. I'm using an Adaptec APA-1460A PCMCIA SCSI adapter which is listed as compatable in the version 4.0.0 readme file.The software can be downloaded onhereand matlab R11 v5.3.0.10183 can be downloadedhere.Version 4.0.0 requires login credentials to get it. let me know if you want to try it and I'll pm the credentials over.After installing the software it creates a doc folder with the manual. Unfortunately the manual doesn't offer much troubleshooting advice, it starts off assuming that everything is installed and working.Anyone have any ideas?Thanks,Kyle

author: kyleaudio
author_rank: Contributor
timestamp: February 06, 2021, 11:22:03 pm
content: Bump!Here are some teardown photos.Anybody have any ideas?
FY6900 issue - Page 1
Forum section: electronics / testgear

author: meridian
author_rank: Newbie
timestamp: February 05, 2021, 03:04:21 pm
content: Hi,I have an issue with my FY-6900.The generated signals are not very cleans, see below...I just turn on the FY-9600 and selected a waveSINRECTANGLECMOSI flashed the firmware to 1.3 with success, but same thingI opened it and I found the ground cable unsolder. I solded it, but without more successAt this time, I have no more idea

author: bob91343
author_rank: Super Contributor
timestamp: February 05, 2021, 06:30:28 pm
content: Always check the power supply first.

author: nctnico
author_rank: Super Contributor
timestamp: February 05, 2021, 06:32:20 pm
content: It looks more like the output of the signal generator isn't switched on. There is a button for that on the front panel.

author: meridian
author_rank: Newbie
timestamp: February 05, 2021, 08:05:17 pm
content: I checked power supply :+4.97v+14.70v-14.60vI did a reset factory, and checked buttons on the front panel. All seems ok. Channel enabled and SIN or others waves set to OnI tested both outputs, same result

author: bob91343
author_rank: Super Contributor
timestamp: February 06, 2021, 06:46:06 am
content: If both outputs are bad, look for something common to both. Like a crack in the circuit board preventing power from reaching the output amplifiers.

author: meridian
author_rank: Newbie
timestamp: February 07, 2021, 04:38:11 pm
content: I didn't see anything on the board.I checked regulators 7905 and 7805.Without schematics, I think it'll be difficult to find where is the problem.
Korad KEl102 rebranded Stamos Soldering S-LS-60 any opinions? - Page 1
Forum section: electronics / testgear

author: nightfire
author_rank: Frequent Contributor
timestamp: January 29, 2021, 07:10:43 pm
content: Well, as I am getting into doing some battery discharging, I look for a reasonable electronic load, that is able not to do only CC mode, but CP as well.And some digital interface would be cool, too.And I just stumbled over a Stamos Soldering S-LS-60, that looks like a rebranded Korad KEL102. As the Korad seems to have some solid reputation for the price, I am tempted to give it a try, especially since it is half the price of a Rigol or Siglent unit...Does anyone have some experience about Stamos Soldering as a company and maybe some subtle differences the rebranded products may have?Here in germany I can get a genuine KEL102 from a well know reputable seller for around 300 including tax plus shipping, and the Stamos goes for around 225 including everything...

author: nightfire
author_rank: Frequent Contributor
timestamp: February 06, 2021, 12:42:13 pm
content: Ok, I dediced to buy it- the device has just dropped from the delivery van, is getting accustomed to room temperature and I already opened it...On the PCB it reads: Korad_LOAD V3.0 20200709Does anyone know how to read that? Date of PCB revision?
Fluke 77/BN......."BN"? - Page 1
Forum section: electronics / testgear

author: Axtman
author_rank: Regular Contributor
timestamp: January 20, 2021, 06:15:23 am
content: On the Fluke model 77/BN, what does the BN mean?

author: SlightlyVague
author_rank: Newbie
timestamp: February 06, 2021, 12:31:47 pm
content: US military version
How to install EMC analyser software by Laplace instruments? - Page 1
Forum section: electronics / testgear

author: ocset
author_rank: Super Contributor
timestamp: February 05, 2021, 11:22:22 pm
content: The top software in this page...https://www.laplace.co.uk/software/...how do you install it?....i installed it, but when i try to open the app it says error message "The code execution cannot proceed because usbi2cio.dll was not found."How do i solve this? I re-installed but no joy.
Manually Setting Attenuation on a Tektronix TDS320 scope? - Page 1
Forum section: electronics / testgear

author: xenium
author_rank: Newbie
timestamp: February 05, 2021, 06:38:04 pm
content: I recently acquired my first scope, a TDS320. I know this isn't regarded as a great scope, but I got it cheap and in working condition, and my only real use case for it is occasionally diagnosing vintage 8 and 16 bit computers that run at a few MHz, so I can't complain. :-)Anyway, the scope came with a couple of aftermarket 1x/10x switchable probes that of course do not have the little sense pin on the BNC, because they're switchable. I have read the entire TDS320 manual, searched the forums here, searched Google... for the life of me I can't find a way to manually set the scope to 10X attenuation. I do see an option if using an external trigger where I can set the external trigger to 1X or 10X, but not the main channels.I did see a thread on the forum here about making your own 3D printed adapters to engage the sense ring on the scope with a resistor. Are there some scopes where there just is no way to manually set this? The little 3D printed adapter rings are a great idea, but alas, I do not have access to a 3D printer. :-(I could go buy some 10X probes with the pins of course, but that's a lot of money for what is essentially a toy to me that cost < $100 to begin with. Plus the probes I have seem to work just fine, so don't fix it if it ain't broke, right? :-)
SoftPlot +Plus+ Windows PC software for screenshots. - Page 1
Forum section: electronics / testgear

author: ARF
author_rank: Regular Contributor
timestamp: January 31, 2021, 05:14:00 pm
content: I recently bought a rather old ADVANTEST R3265A spectrum analyzer and it doesn't have a floppy drive.I would like to take screenshots and I found this software:http://www.aphena.com/softplot_plus.htmDoes anyone have at least a trial version?

author: xmo
author_rank: Regular Contributor
timestamp: January 31, 2021, 06:33:32 pm
content: Look at the KE5FX GPIB Toolkit

author: ARF
author_rank: Regular Contributor
timestamp: February 05, 2021, 10:37:56 am
content: Thanks, xmo! I will try!This is the solution only for the GPIB, the SoftPlot can work also via UART.