hybridfree/eevblog-posts huggingface dataset:
Looking for a resonably priced probe holder - Page 1
Forum section: electronics / testgear

author: johnnyboy
author_rank: Newbie
timestamp: November 23, 2013, 08:35:37 pm
content: Greetings! I'm looking for a decent, but reasonably priced probe positioner/holder for my o-scope. I would like to stop soldering little wires to my SMT pads and clipping onto them.Agilent offers this one:http://www.home.agilent.com/en/pd-1643963-pn-N2787A/3d-probe-positioner, but at over $700USD, it's outrageously overpriced. The little two leg guys don't really have the precision I'm looking for since I'll be probing tiny things.Thoughts?

author: mcinque
author_rank: Unknown
timestamp: November 23, 2013, 10:24:00 pm
content: This could be ok?https://www.distrelec.it/accessori-per-sonde-pmk-posizionatore-msa100/pmk/msa100/915501Distrelec is an EU distributor. Don't know your country, but maybe searching "PMK MSA-100" could help you to find it in other shops.

author: deth502
author_rank: Frequent Contributor
timestamp: November 23, 2013, 10:26:25 pm
content: kind of reminds me of an indicator stand/holder.http://www.grizzly.com/catalog/2013/Main/753idk if the magnet would be a problem dealing with electronics. im sure the base can be easily replaced with a hunk of steel or granite, or something of that nature.
Siglent SDG1020 has changed to Chinese - Page 1
Forum section: electronics / testgear

author: IO390
author_rank: Regular Contributor
timestamp: November 19, 2013, 01:15:11 pm
content: So my new SDG1020 arrived yesterday, quite impressed with it for £200. Not quite up to the standard of my 3314A, but then nothing really isAnyway, so I am playing around with it, I pressed 'Mod' and started to change the waveform and all of a sudde, everything is in Chinese. I can't read Chinese so I can't see how to change it, and I can't find anything in the manual regarding changing the language.Does anyone know what combination of keys I need to press?IO

author: IO390
author_rank: Regular Contributor
timestamp: November 19, 2013, 01:59:48 pm
content: Never mind, I managed to eventually fix it after spamming all the buttons. Weird that it just randomly changed though, maybe it became self aware and decided to troll me...

author: Herman
author_rank: Contributor
timestamp: November 22, 2013, 01:29:27 am
content: I think you should press 'utility'-'system'-'language'.

author: bingo600
author_rank: Super Contributor
timestamp: November 23, 2013, 11:58:29 am
content: Quote from: IO390 on November 19, 2013, 01:15:11 pmMaybe a 3324A ?https://www.eevblog.com/forum/testgear/hpagilent-3324a-teardown/msg191208/#msg191208/Bingo

author: eurofox
author_rank: Unknown
timestamp: November 23, 2013, 12:17:52 pm
content: Hi,I have a Siglent SGD1050 and I really love iteurofox

author: Hydrawerk
author_rank: Super Contributor
timestamp: November 23, 2013, 10:19:51 pm
content: OT:This cannot happen with Agilent DSOX2000scopes, because when you turn on the scope a language setting menu isalwaysshown...
Rigol DS1104Z-s - Page 1
Forum section: electronics / testgear

author: Edwin Noorlander
author_rank: Contributor
timestamp: September 12, 2013, 09:53:53 pm
content: Dave can jou do a review, tear down of a Rigol DS1104Z-s?

author: Hydrawerk
author_rank: Super Contributor
timestamp: September 12, 2013, 10:55:00 pm
content: These scopes are now present on Rigol EU website.http://www.rigol.eu/products/digital-oscilloscopes/ds1000Z/But there is only a quick guide, not a full user manual yet.

author: Hydrawerk
author_rank: Super Contributor
timestamp: September 14, 2013, 02:03:16 pm
content: Here is the datasheet, i had to compress it. Well, the signal generator is better than in my DSOX2002A. Rigol has always had quite good hardware.

author: awallin
author_rank: Frequent Contributor
timestamp: October 08, 2013, 06:36:03 pm
content: When are these going to be available?For examplehttp://www.batronix.comjust lists >21 days - that could mean many months??

author: johnnyfp
author_rank: Frequent Contributor
timestamp: October 08, 2013, 11:13:39 pm
content: Well according to John atEmona.com.au, 3-4weeks, and that was 2 weeks ago (Yes I know I could have just said in a week but hay, I like waffles of all types including the talking type).Needless to say, I placed an order for one. Now waiting. Ooh exciting times.

author: awallin
author_rank: Frequent Contributor
timestamp: October 10, 2013, 06:23:21 pm
content: blah, I'm in Europe and asking for a quote throughhttp://www.eu.rigolna.comredirects the rfq to my local distributor who says they could deliver in 7-9 weeks

author: bigmessowires
author_rank: Contributor
timestamp: October 11, 2013, 02:39:43 am
content: I just received my DS1074z today (in California). Purchased from Tequipment.Edit: This is the DS1074Z, not the Z-s. I don't know if availability is different for the -S models.

author: johnnyfp
author_rank: Frequent Contributor
timestamp: October 11, 2013, 02:52:34 am
content: Where's my one

author: manu
author_rank: Regular Contributor
timestamp: November 21, 2013, 04:26:28 pm
content: Hello,I intend to buy this dso (DS1104Z-s).I have read the user manual, but I'm not sure if I can record a waveform from an anlog input channel and playback it with the waveform output.Does anyone have done that with this kind of equipment?Thanks,

author: Hydrawerk
author_rank: Super Contributor
timestamp: November 21, 2013, 11:22:21 pm
content: From the user manual it is hard to say. You musr try it at your local shop...

author: manu
author_rank: Regular Contributor
timestamp: November 22, 2013, 08:42:02 am
content: I will try when I receive it, it's not a mandatory feature for me, but it would be nice to simulate real inputs.If someone is interested, I will post the result.
Sencore SC61 - Page 1
Forum section: electronics / testgear

author: Six_Shooter
author_rank: Regular Contributor
timestamp: November 21, 2013, 06:06:32 am
content: I have an opportunity to buy a Sencore SC61 for $200 (CDN).From what I've been able to find so far this seems like a decent price.I like the secondary display it has for the many uses it has, voltage measurements, frequency counter/display, etc.Overall it sounds decent, but I'd like to hear from anyone that has experience with these, and thoughts.Also semi-local to me is a Tektronix 2220 O-scope for $100. This also seems like a good deal, but I haven't found a whole lot of details in the few minutes I've looked for info. It seems to have less features than the Sencore, but it is a Tektronix...Any input is appreciated.FWIW, I have a Velleman PC based scope I want to replace/augment with an analog 'scope. I use mid to high mid range DSOs at school, Tektronix DSO3000 series, Rigols, and a couple others, depending on the actual lab I'm in. I mention this to allow for comparison and background in O'scope use.

author: Six_Shooter
author_rank: Regular Contributor
timestamp: November 21, 2013, 04:25:21 pm
content: So far the only issue I've found with these is that the CRT sometimes goes dim, and usually is restored by using a CRT restorer, will have to look into what that is...Any feedback is appreciated.

author: zaoka
author_rank: Frequent Contributor
timestamp: November 21, 2013, 06:14:02 pm
content: This is very very old scope especially for $200. They also have problems with capacitors and rotary switches. I used to work with one. Get SC3100 Sencore, its newer model.It probably needs calibration as well, you have to use Sencore probes...

author: Six_Shooter
author_rank: Regular Contributor
timestamp: November 22, 2013, 12:12:13 am
content: What is it about them that you have to use Sencore probes?

author: zaoka
author_rank: Frequent Contributor
timestamp: November 22, 2013, 10:24:24 pm
content: They have separate pin used for multimeter.

author: Radio Tech
author_rank: Frequent Contributor
timestamp: November 23, 2013, 12:38:07 am
content: I own one of these and love it. But has had it;s share of issues. Bought mine on ebay and when arrived it did not work. Opened it up and found a connector had fallen off during shipment. Worked fine when I reinstalled it. A year later started having probe problems. Only the Sencore probes are useful for the LCD to work. After spending $$$ for probes it again worked great. Now 4 years later it has developed another issue. The trace bounces around. You can tap the case and it will quit. When you remove the case it works fine....

author: Six_Shooter
author_rank: Regular Contributor
timestamp: November 23, 2013, 01:18:44 am
content: So it seems that my first impression is correct and that, while it's a cool 'scope for it's time, it's not worth the asking price.I'll likely grab a $100 Tek or something like that, I do want an analog 'scope.But I think I'll take the money I would have spent on this Sencore and get a Rigol DS1052E or something similar, for a little more.
Can't enable O.V.P. and O.C.P. with output turned OFF (RIGOL DP1308A) - Page 1
Forum section: electronics / testgear

author: clifford
author_rank: Regular Contributor
timestamp: November 11, 2013, 01:17:10 am
content: Hello everyone,I have a RIGOL DP1308A power supply, but I guess my question is not really specific to this device. With this supply I can not enable O.V.P. and/or O.C.P. when the output is turned off. I have to first turn on the output and then can individually turn on O.V.P. and/or O.C.P., which means I have to do it every time I turn on the output if I'm working with a DUT where I want to use this features in addition to the usual CV and CC limits.Obviously this was done deliberately by RIGOL. I was wondering why. The manual only states the fact but does not offer an explanation..I'm sure someone here can explain to me why I would prefer this behavior.

author: iDevice
author_rank: Regular Contributor
timestamp: November 15, 2013, 07:53:02 pm
content: Yeah, how more stupid can it be !You need to blow out the circuit you are testing before having the time to enable OCP...This power supply is nice overall, although a bit week on max current on the +/- 25 volts outs, but the OVP and OCP are useless.All my lab is Rigol and I'm quite happy with all equipments so far, but my next PSU won't be for sure, unless they change this.The problem is that I don't remember having seen this fundamental problem in reviews, so I guess no one is aware of this flaw before buying.Now ok, it's not dramatic, in most cases you just have to disconnect the positive banana plug instead of using the button, but for a programmable PSU, well

author: clifford
author_rank: Regular Contributor
timestamp: November 15, 2013, 08:06:22 pm
content: Quote from: iDevice on November 15, 2013, 07:53:02 pmI've uploaded a video on that a couple of days ago. So at least now there is something online:http://youtu.be/qPp35eGl26II wrote a mail to rigol europe the same day but (of course) haven't got an answer yet..

author: iDevice
author_rank: Regular Contributor
timestamp: November 17, 2013, 04:53:37 pm
content: Well doneI've had great support from Rigol Europe so far, but you have sometimes to wait for 48H and in rare cases, they are a bit overflowed and miss a mail.A reminder generally helps.But I'm afraid one or two complaints about this design flaw won't matter much and they will probably answer : It's by design and perfectly in spec.It it was Dave ranting about it, maybe...I'll open a ticket as well.Wait & see...

author: clifford
author_rank: Regular Contributor
timestamp: November 22, 2013, 03:11:16 am
content: Quote from: iDevice on November 17, 2013, 04:53:37 pmWell, I still haven't heard back from RIGOL. Maybe I will send them a reminder..Please post a note if you learn anything from them..
fluke 123 \ 124 \ 125 - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: November 21, 2013, 09:09:04 am
content: I have been reading the specification for the fluke 120 seriesThey all sample at 25 Ms/S.So how can the Fluke 124 and Fluke 125 have a bandwidth of 40Mhz at 25Ms/SThe only way I can see if this is possible is if they interleaved the two ADC inputsThe circuits diagrams are the same?Anyone got an answer?
Riglol Keygen down? - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: November 20, 2013, 03:17:47 am
content: Does anyone know when it will next be up? I just received my DS1074Z, and am burning away trial time playing with all the amazing features of this scope. I have the source code downloaded, so if there is a way to get that working, please let me know. BTW, pics and a vid review will soon be posted.

author: olsenn
author_rank: Frequent Contributor
timestamp: November 20, 2013, 03:34:19 am
content: Here you go (attached)

author: echen1024
author_rank: Super Contributor
timestamp: November 20, 2013, 03:42:42 am
content: Nah, I found the source. It's fine now. Thanks though.
HANTEK MSO5102D Oscilloscopes user opinion  - Page 1
Forum section: electronics / testgear

author: ilanko
author_rank: Contributor
timestamp: November 07, 2013, 06:39:38 pm
content: Hi guys,I am looking to buy an oscilloscope, anyone have any experience with HANTEKhttp://goo.gl/bK4sJVproducts ?

author: Macbeth
author_rank: Super Contributor
timestamp: November 29, 2013, 04:11:25 pm
content: I've just got an MSO5102D in the post just now. Not even powered it on yet. (I mean, I have to pull it apaaaart first surely?). £290 delivered to the UK. From what I can tell it is a bargain and very easy to upgrade to 200MHz if you find the mega thread on these 'scopes.I'm due to receive a Siglent SDG1025 Signal/Arv waveform generator (25MHz) any day soon. I hope it can be hacked up to 50MHz just as easily. £225 delivered.I'll let you know how I get on in a few weeks. Some people don't like that the MSO5102D doesn't do automatic protocol decoding of I2C, etc. I never even knew modern logic probes can do that kind of thing anyway so thats no problem to me, I can always post-process the data anyway. It would be a nice coding project to hack that function into the scope too. There is a genius on the forum that has pretty much reverse engineered these chinese scopes and to me that is far better than any manufacturer type support.It's so cheap I would just go for it!
Fluke Cal in Sydney, Oz - Page 1
Forum section: electronics / testgear

author: mark5009
author_rank: Contributor
timestamp: November 19, 2013, 05:07:42 am
content: Hi, all.This is a local query for Sydny-siders. I am after getting my Fluke 8852A calibrated. I don't have the equipment in my lab to do the higher ranges so I figure I should pay someone to do the job. I called the official Fluke guys (Celemetrix) and they told me $340!!! Doh! That is more than the unit is worth for heaven's sake. I've called Emona but their dude has left for the day (go figure).Anyone had any experience with folk who will do this kind of thing for a fair price? Or is that a fair price and I am living back in the 70s?Many thanks .. mark.

author: EEVblog
author_rank: Unknown
timestamp: November 19, 2013, 05:16:58 am
content: Try Trio Smart Cal.Basically, no cal is going to cost less than say $100. It takes time to run through all the tests (if they don't have it automated) and produce the report.BTW, what is an 8852A ?

author: mark5009
author_rank: Contributor
timestamp: November 19, 2013, 05:43:19 am
content: Thanks, Dave.The 8842A is a 5.5 digit benchtop digital multimeter from the mid-90s . All the usual stuff you'd expect, though mine is short the True RMS option. I scored it for not very much, but it is in need of a tune-up. I'll give Trio a call... mark.http://www.teknetelectronics.com/Search.asp?p_ID=13955&pDo=DETAIL

author: mark5009
author_rank: Contributor
timestamp: November 20, 2013, 02:26:57 am
content: A quick follow-up on this.The cheapest calibration seems to come from TR-VMS in Preston (south of Liverpool). They are quoting me $190 (with GST) for a NATA cal. Far and away the best option.Emona doesn't cal these unit. Smart Cal are quoting $305 for a Trace Cal (I didn't bother to find out the price for a NATA cal). And Celemetrix wins at $340 for a Trace Cal.Still more than I'd like to pay (TekNet in the States quotes $90 for a Trace, which would be fine for my "lab") but what you going to do? $200 is still plenty cheap for an instrument of this quality.The reference for TR-VMS ishttp://www.trvms.com.au/calibration/.. mark.

author: EEVblog
author_rank: Unknown
timestamp: November 20, 2013, 02:37:45 am
content: Quote from: mark5009 on November 20, 2013, 02:26:57 amIt depends entirely on how much you value the cal certificate, and what confidence you already have in the instrument.The meter is most likely to still be within spec (you are paying for calibration check,notan adjustment), so if you have other means to gather confidence in the instrument (another meter to cross check, your own standards etc), then you can argue the cal is a waste of money unless you no longer have confidencein the instrument.

author: EEVblog
author_rank: Unknown
timestamp: November 20, 2013, 03:19:50 am
content: BTW, it seems the 8842A regularly goes for under US$200 on ebay.
TL175 leads not listed as compatible with 87v? - Page 1
Forum section: electronics / testgear

author: smoothtalker
author_rank: Regular Contributor
timestamp: November 19, 2013, 04:55:45 pm
content: I'm curious why didn't fluke list tl175 as compatible with 87v. It doesn't look like a typo because both products coincides. Anyone knows?http://en-us.fluke.com/products/digital-multimeters/fluke-87v-digital-multimeter.html#fbid=QV0b2C_8VNx?modelsaccessorieshttp://en-us.fluke.com/products/all-accessories/fluke-tl175.html#fbid=QV0b2C_8VNx?modelsaccessories

author: Unknown
author_rank: Unknown
timestamp: November 19, 2013, 08:06:16 pm
content: I would assume the models / accessories lists are all from the same source (i.e. a relation A-B would cause A to show up with B and B to show up with A), and that someone forgot to enter the 87V-TL175 relation. Can't see any technical reason why they would be compatible with the Fluke 113 and 287, but not the 87V.

author: rolycat
author_rank: Super Contributor
timestamp: November 19, 2013, 08:19:05 pm
content: The TL175 probes are definitely compatible with the 87V - Fluke supplied a set with Dave's GSM-fix meter (see EEVBlog #185 at around 14:20).

author: Lightages
author_rank: Unknown
timestamp: November 20, 2013, 01:49:30 am
content: The TL175 leads are compatible with any properly designed meter that can accept shrouded banana jacks.
Chroma 6314 dc load programming question - Page 1
Forum section: electronics / testgear

author: saposoft
author_rank: Contributor
timestamp: November 20, 2013, 12:21:27 am
content: Does anyone have experience in programming Chroma 6314 loads using ieee488 (HP-IB , GPIB) ?I made some test but I'm stuck on oddities of responses, also don't understand the registers on the manual
(Yet another) Used oscilloscope question/advice - Page 1
Forum section: electronics / testgear

author: nightmechanic
author_rank: Contributor
timestamp: November 19, 2013, 10:20:08 pm
content: Hi all,As this is my first post here, I would like to thank everyone contributing, I have been going through a lot of threads in this forum in the past few days and it has been very educational and beneficial, so, thanks!I am want to buy my first scope for my home “lab”, and would like your advice. (I am familiar with oscilloscopes and have been working with them for about 15 years now at work, however, I am not familiar with some of the models below)so, the scope will be used for “general purpose” design and debug work - (few) MHz switching regulators, other power management, analog accelerometers. I am mainly planing to work on MCU based “mixed signal” systems, I have a USBEE clone for the digital debug which I am happy with, so I can avoid for now buying a mixed signal scope. I think Ineed2 channels, 4ch are nice to have, I would like 100MHz analog bandwidth so I won’t “miss” anything.My options:HP 54645A 2ch 100MHz (200MSPS, 1Mpoint memory)- ~300$ (the only one in the list I am familiar with, and had very good experience with)TDS520A - 2ch 500MHz (500MSps) ~430$ with 1F (floppy disk - hurray) and 1M (50k points memory)options, it was last calibrated on March 2012!Fluke PM3380B 2ch 100MHz 200MSps, both analog (or) digital sampling (if i understood the manual correctly ?)some older/analog scopes -they are not cheap and getting old, are they worth it?TEK 2245 - 4ch 100MHz analog ~350$TEK 2430A - 2ch 150MHz ~ 450$TEK 2465B - 4ch 400MHz ~600$ which is a little over my budget, but I understand that it is a very good scope and wonder whether its worth the extra $Any thoughts and suggestions will be appreciated,Thanks!Ran
Agilent 3324A as function generator? - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: November 19, 2013, 01:14:18 am
content: How will this stack up to your average Rigol, and are there any nice features and functions of this gen? I really want a higher end piece of Agilent/HP kit, but don't want to pay for it.

author: PA0PBZ
author_rank: Super Contributor
timestamp: November 19, 2013, 12:35:25 pm
content: Have a look here for a start:https://www.eevblog.com/forum/testgear/hpagilent-3324a-teardown/
Extech EX540 / Digitech QM1575 python reader - Page 1
Forum section: electronics / testgear

author: Harvs
author_rank: Super Contributor
timestamp: November 19, 2013, 01:48:36 am
content: For anyone who's used the software that comes with this meter, you'll understand it's not the pinnacle of functional software.As part of my DMM Tablet project I've written a decoder to convert the serial stream from this DMM into something usable. So feel free to use it to implement your own functionalityhttp://www.electronicsinoz.info/extech-ex540-digitech-qm1575-python-decoder/Any questions or bugs, please let me know.

author: Wytnucls
author_rank: Super Contributor
timestamp: November 19, 2013, 02:17:32 am
content: How bad is the Extech software? Do you have a capture of the computer interface?

author: Harvs
author_rank: Super Contributor
timestamp: November 19, 2013, 02:28:05 am
content: Sure, attached.It's got a few bugs. E.g. if the port which it remembers the device being on isn't available (e.g. windows has assigned a different port this time) it crashes and wont start.But mostly, other than just capturing readings and exporting them to an excel file, it simply doesn't do anything. In my opinion, the whole point of connecting your DMM to a PC is so you can do things like calculate currents across external shunts, or use multiple DMMs to do power calculations, or statistics, or single captures of resistances etc.

author: Wytnucls
author_rank: Super Contributor
timestamp: November 19, 2013, 02:38:47 am
content: It is very similar to the Uni-T software. Very basic indeed. I can run 2 meters in their own windows simultaneously, but still have to import all the data into a spreadsheet for any kind of manipulation. Clock sync is also a problem, with rapidly changing values.

author: Harvs
author_rank: Super Contributor
timestamp: November 19, 2013, 03:23:37 am
content: Quote from: Wytnucls on November 19, 2013, 02:38:47 amSurprisingly similar isn't it.QuoteI'm not sure (I don't have two Extech's,) but I'm dubious as to whether you can actually have muliple EX540's linked at the same time. The RF link looks like one of the simple 433MHz on/off keying tx/rx sets you get for $5. I have my doubts about there being in ability to have them both occupy the same freq range at the same time.QuoteYes, but I think this is always a problem with instruments that don't have a clock sync input. Even in the screen grab I took the sample time varies between 1-4 seconds, which it clearly doesn't, it's just when the PC put a timestamp on the sample.

author: Harvs
author_rank: Super Contributor
timestamp: November 19, 2013, 04:56:06 am
content: Now with added Bluetooth:http://www.electronicsinoz.info/extech-ex540-digitech-qm1575-adding-bluetooth/
Meanwell 1500 watt PSU UPDATE! - Page 1
Forum section: electronics / testgear

author: AlanR
author_rank: Regular Contributor
timestamp: November 18, 2013, 10:45:27 pm
content: Well you guys may have remembered me from back when I brought up the issue of the capacitors used in my power supply and the buss bar to metal frame clearance issue. Well today I have fixed both of these issues. The capXon capacitor values were 25 volt, 47uF; 50 volt, 10uF; and 50 volt, 3.3 uF. All replaced with Rubycon YXJ series except for the 10uF, which is a Nichicon TT series. I also put a single layer of Kapton tape on the surface of the enclosure that is close to the buss bars as you can see here:http://s24.postimg.org/5pq4h86hh/S1020001.jpgI did a 24 hour load test for this 24 volt power supply by using a 0.50 ohm, 1000 watt resistor with a box fan blowing on it. The PSU did not let out any magic smoke and it held voltage at 23.95 volts.The 1000 watt beast resistor:http://s22.postimg.org/43prle61t/S1020002.jpgSo far I am satisfied with the results and have been using this power supply to characterize DC motors. Glad it works so well!! It also has no overshoot issues upon power up.

author: Co6aka
author_rank: Unknown
timestamp: November 19, 2013, 04:31:36 am
content: Quote from: AlanR on November 18, 2013, 10:45:27 pmFuhgeddaboudit!(I've got the 48V version... Gonna have to "Take it APARRRT!")
fluke 123 a.c adapter  - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: November 17, 2013, 01:53:47 pm
content: Problem solved.

author: somlioy
author_rank: Regular Contributor
timestamp: November 18, 2013, 09:13:44 pm
content: Maybe share your solution with other people?

author: R_G_B_
author_rank: Frequent Contributor
timestamp: November 19, 2013, 12:00:42 am
content: I managed to find a 15v 400ma adapter in the cupboard. Then I Just swopped the polarity on the din connector. All seems ok.Just waiting for the thing to charge after as battery refresh.
hitachi v-550B problems - Page 1
Forum section: electronics / testgear

author: mj21
author_rank: Regular Contributor
timestamp: November 21, 2013, 10:50:22 am
content: recently i bought a Hitachi v-550B 50MHZ scope of eBay. it powers up and there is a trace. when i feed the 1khz square wave from the scope to channel one if the volt/div is below 0.1mv i get overshoot and undershoot in the square wave, if its above 0.1 i get kinda of a square wave. picture 1 and 2now channel two is kinda mad to, i get whats is in picture 3, regardless of the voltage divisioni have checked the 1khz wave with my rigol scope and it is a perfect square wave.does anyone know what could be the problem?thanks

author: Chryseus
author_rank: Regular Contributor
timestamp: November 21, 2013, 01:27:34 pm
content: Compensate your probes maybe ?There should be a trim pot on the probe handle or near the BNC connector.Adjust it until you get a nice flat on the square wave.

author: mj21
author_rank: Regular Contributor
timestamp: November 21, 2013, 03:01:06 pm
content: thanks, i tried it and still the same thing. funny think is when i connect a signal to the inputs the ground wire makes no difference in the signal integrity. usually if i don't connect the ground wire the signal is all over the place, can there be a problem with the grounding?

author: grumpydoc
author_rank: Super Contributor
timestamp: November 21, 2013, 04:04:56 pm
content: The first picture could just be probe compensation, the high frequency response is a bit too high but I'm slightly suspicious that the HF compensation in the 'scope's attenuator is off because it shouldn't really depend on the attenuator setting.The trace in the third picture looks like the low frequency response is too low, such as you'd get if it were going through a DC blocking cap. Do you have your AC/DC coupling switch set to DC and if DC have you checked that the switch works and you get a DC path through to the 'scope input.Scratch that - you get a different trace in that case, looks more like a cap inparallelwith your signal (so more low-pass than high pass).Really you could do with a decent square wave source that will drive a 50ohm termination because then you can check the 'scope without worrying about getting the probe comensation right.As you have a 2nd 'scope if you get a decent signal source you can trace it through the input channels on the Hitachi to see where it all goes pear shaped.
Pomona SOIC test clips  - Page 1
Forum section: electronics / testgear

author: jshonw
author_rank: Contributor
timestamp: November 18, 2013, 09:29:51 pm
content: I bought a pair of Pomona 8 pin SOIC test clips(part no. 5250) sometime ago and finally got around to play with them yesterday. Only after about a dozen clips, one of the leaf contacts felt like it caught on a pin and ripped out.The contact was permanently bent upwards and there was no way to bend it back. After taking the clip apart, I didn't have any confidence in the method that was used to secure down the leafs. It looked weakly melted into position.To remedy the problem, I put a blob of epoxy over that area. For the bent leaf, I held it down with a tip of a small screw driver while it cured.I had a look this morning and it appears that I messed up one side. The epoxy flowed too far forward which inhibited the movement for a couple of the leafs. The clip no longer sits flush to the board and rides up one side of the chip. Oh well.
output on/off buttons on higher end PSU - Page 1
Forum section: electronics / testgear

author: GreyWoolfe
author_rank: Unknown
timestamp: November 18, 2013, 12:43:20 pm
content: I asked this question in a different thread and can't remember the thread I asked it in, so I will start one so I can track it. I see on better PSUs a switch that turns the output on and off. Is this an actual circuit or just simply a switch on the positive wire? I like this idea and I have an Elenco XP720K PSU kit that I built and modified and would like to add this to the +/- variable voltage outputs.Tom, NW0LF

author: dr.diesel
author_rank: Super Contributor
timestamp: November 18, 2013, 12:49:58 pm
content: Here is your first thread:https://www.eevblog.com/forum/projects/adding-a-load-shut-off-circuit-to-a-basic-psu-is-it-possible/msg327815/#msg327815
Wavetek 182A transformer question - Page 1
Forum section: electronics / testgear

author: GreyWoolfe
author_rank: Unknown
timestamp: November 05, 2013, 01:44:35 am
content: I bought a Wavetek 182A from a fellow ham that doesn't work. He said he was checking it to sell it and when plugged in, the magic smoke came out of the transformer. I also visually found a 22uF 25V Tantalum cap and an associated resister blackened. Since there is no voltage out of the supply, I started looking for a replacement transformer. Googling the mfr and Wavetek part numbers yielded nothing. Con anyone recommend a replacement transformer? It isn't important to me to have a dual input voltage transformer. I am just trying to see if it is economical to repair. If not, I will just strip it for components.Tom, NW0LF

author: Vgkid
author_rank: Super Contributor
timestamp: November 05, 2013, 03:47:26 am
content: Looking at the schematic it looks like a 18+ Volt transformer should work, as it is feeding a 15v regulatorlets see if I get a reply on this thread, first.https://www.eevblog.com/forum/beginners/wavetek-182a-repair/15/BTW I should get the 1952B manual hopefully on BAMA this week, tests and work kept me from doing it earlier.

author: casinada
author_rank: Frequent Contributor
timestamp: November 13, 2013, 06:48:16 am
content: Check the transformer by itself. Probably there is a short in the PCB caused by bad caps, resistors or diodes and the transformer is good. Check fuses if there is any. Good luck.

author: GreyWoolfe
author_rank: Unknown
timestamp: November 18, 2013, 12:27:58 pm
content: sorry to take so long to get back. I did and the transformer has no voltage out.Tom, NW0LF
Electrical Lab Tour - Page 1
Forum section: electronics / testgear

author: nick.sek
author_rank: Regular Contributor
timestamp: November 18, 2013, 04:14:13 am
content: Hey Everybody,My lab is finally getting respectable, so I have decided to go trough a quick tour and showcase my lab. IF you think there is a setup I am missing let me know! The lab will only in my pocession for a little whiler longer until it is donated to the maker space I am starting out!Here is the link to the lab tour:http://youtu.be/yNTZ_5sZAYkIf anyone if interest in how I am organizing my tool chest drawers here is the link out how I accomplished it:http://youtu.be/U_t4md6jawEAnd if any one is interested in the maker space:http://youtu.be/gfSHfFqwwXQAny feedback would be greatly appreciated, and thanks in advance for the feedbackNick
TENMA 72-5016 Function Generator - Page 1
Forum section: electronics / testgear

author: Ketema
author_rank: Newbie
timestamp: November 17, 2013, 06:00:58 am
content: Hello guys! Hope every one is oky!Four months ago I purchased a broken TENMA 72-5016 5MHz function generator from Ebay. The advertisement said it doesn't power up and was sold as is. But after looking around inside the instrument a simple fuse replacement brought it back to life. But recently I can't seem to adjust the output frequency beyond multiples of 5 and 7 using the frequency adjustment pot. That is, it can only output 5 to 7Hz on the ones range, 50 to 70Hz on the 10th and 500 to 700Hz on the 100th range and so on.I changed the Pot but that didn't fix it. What I was hoping from you guys is to share a service manual for it if you do have one as that would greatly simplify finding the fault. By the way, I did search every where in the internet but couldn't locate any manual.Thanks you for any help you provide in advance!
Kenwood PR18-3 schematic - Page 1
Forum section: electronics / testgear

author: calexanian
author_rank: Super Contributor
timestamp: November 16, 2013, 04:27:04 am
content: Anybody have a schematic for a Kenwood PR18-3 schematic? Its the type of design where everything needs to be crammed together and connected to get voltages, and you cant see anything that way. Flying blind. I see the first tap voltage (14 vdc) on the main filter caps. No power light, and no output. It was acting up and the short circuit cut out was tripping intermittently sitting there with no load, then dead. If i cant fix it or get a schematic in a reasonable time then in the scrap box it goes. I got my 15 years out of it so I am not upset.
Gossen MetraHit 23s rescued from leaked battery death - Page 1
Forum section: electronics / testgear

author: mianchen
author_rank: Regular Contributor
timestamp: November 13, 2013, 11:26:45 pm
content: I got hold of a Gossen MetraHit 23s that was advertised as "working order", only to find it not working at all except DC mA, A stop watch and pulse gen.Here are some pictures of its guts.Other functions didn't work at all, here's what happened when measuring 10V DCI took the whole thing apart, washed and scrapped off the horrible stuff, here is part of the repair boardTook me more than 4 hours from washing, drying to repair...and the hard work paid off:Measuring 2.5V DC10V DC240V mains ACDC AmpI am happy

author: trackman44
author_rank: Regular Contributor
timestamp: November 14, 2013, 12:24:28 am
content: Use an old toothbrush and isopropyl alcohol to clean it up and get rid of all that crud. Lets us know if it improves.Will

author: nanofrog
author_rank: Super Contributor
timestamp: November 14, 2013, 12:33:16 am
content: Nicerescue.What all did you have to do besides clean the leaked acid off of everything?

author: lowimpedance
author_rank: Super Contributor
timestamp: November 14, 2013, 12:35:15 am
content: Good job, maybe change your 10 V pic.Leaked battery gunk always gives me a scare when first discovered in a prized bit of gear.Found a HP25 calc. in the bin yesterday, just took it apart and yes its toastdamn nicads.

author: mianchen
author_rank: Regular Contributor
timestamp: November 14, 2013, 03:05:51 pm
content: Quote from: nanofrog on November 14, 2013, 12:33:16 amI had to repair many traces that're eaten up by the leakage. The PCB is a 4 layer board, I had to use strong light from the opposite side to figure out the connections. It was painful especially when some of the vias were gone. I repaired 13 traces in total.I also desoldered some of the big components (eg. pic 3) to be able to reach and clean off the &£^$£ hidden underneath.I was lucky, as soon as I finished, powered it on - everything was back to normal. I was worried that I might have missed something or connected something wrong - but I didn't

author: mianchen
author_rank: Regular Contributor
timestamp: November 14, 2013, 03:07:02 pm
content: Quote from: lowimpedance on November 14, 2013, 12:35:15 amdone

author: retiredcaps
author_rank: Super Contributor
timestamp: November 14, 2013, 07:42:08 pm
content: Quote from: mianchen on November 14, 2013, 03:05:51 pmGreat repair job. The strong light is a good repair tip.
Sorry, Double post - Page 1
Forum section: electronics / testgear

author: scratch_monkey
author_rank: Contributor
timestamp: November 14, 2013, 01:29:11 am
content: Sorry, Double postAdmin delete please!

author: Psi
author_rank: Super Contributor
timestamp: November 14, 2013, 02:57:38 am
content: you can delete this yourself, just delete the post

author: scratch_monkey
author_rank: Contributor
timestamp: November 14, 2013, 03:37:00 am
content: "You cannot delete your own topics in this board. Check to make sure this topic wasn't just moved to another board."

author: sipo75
author_rank: Contributor
timestamp: November 14, 2013, 07:08:12 am
content: What was it about?

author: Psi
author_rank: Super Contributor
timestamp: November 14, 2013, 07:17:54 am
content: oh, ok. they must have changed the setting at some point.I've deleted a thread post before and it has removed the thread.I think there was even a thread about this while back with people arguing for both sides of the argument.
Is this PSU any good?  - Page 1
Forum section: electronics / testgear

author: Dave Pye
author_rank: Newbie
timestamp: November 13, 2013, 05:18:59 pm
content: Hi all,has anyone any experience of this bench power supply?http://www.circuitspecialists.eu/power-supplies/bench-power-supplies/triple-output-dc-bench-power-supply-lcd-display-csi-3005xiiiI'm looking to buy my 1st one, but I can't say I've heard of the supplier. I don't want to spend money if it's just a piece of junk

author: Andy Watson
author_rank: Super Contributor
timestamp: November 13, 2013, 05:49:10 pm
content: Looks like a rebadged Hantek.

author: JohnnyGringo
author_rank: Regular Contributor
timestamp: November 13, 2013, 06:07:15 pm
content: You might ask IanJ for a update/review.Quote from: IanJ on May 04, 2011, 09:21:01 pm

author: mariush
author_rank: Super Contributor
timestamp: November 13, 2013, 06:34:31 pm
content: Here's the schematic in case you're curious.

author: Kevin.D
author_rank: Frequent Contributor
timestamp: November 13, 2013, 06:36:19 pm
content: I looked at this one the other day after I saw one in Ian J's videos ,seems cheep enough for the ok specs ,nice dual display.the only thing that put me off was no "output disable/enable" for the outputs only a main on /off switch so you cant preset V while load connected ,that goes for the current limit too you have to short the output to set limit. I wonder how much they save in build cost's by not having output enable/disable switches on them, but it seems peny wise and pound foolish to me .

author: Bored@Work
author_rank: Super Contributor
timestamp: November 13, 2013, 06:38:13 pm
content: Quote from: Andy Watson on November 13, 2013, 05:49:10 pmRebaged QJE aka Ningbo Jiuyuan.

author: Dave Pye
author_rank: Newbie
timestamp: November 13, 2013, 06:52:43 pm
content: Yes, I noticed that too. Having to short the outputs seemed a pain, but for the price range, the other models I looked at had the same "feature". I agree with you, for a few bucks more, they surely could have sorted this.

author: GreyWoolfe
author_rank: Unknown
timestamp: November 13, 2013, 11:32:30 pm
content: Just how would one go about installing an output disable/enable switch in a PSU? Is it as simple as adding a switch on the positive output wire that can handle the current or is it more complicated than that? I built and modded one of the Elenco XP720K and would like to add that feature. I did some searching on the internet and that yielded no results.Tom, NW0LF
Fluke DMM alligator clip revisions - Page 1
Forum section: electronics / testgear

author: BravoV
author_rank: Super Contributor
timestamp: November 12, 2013, 04:57:38 am
content: I'm not sure if this is old news, just want to share that I just figured out that the standard alligator clips accesory that came with my Fluke 287 date code April 2013 is different than the same clips that came with other 287 with date code on early 2012.Newer one are bit longer and has the new plastic cover at the outer jaws, not a big deal though, but definitely a nice revision and appreciate the level of attentions paid to the details.Attached photo below should be self explanatory.

author: Kryoclasm
author_rank: Regular Contributor
timestamp: November 12, 2013, 05:04:15 am
content: Call them Alien clips?

author: BravoV
author_rank: Super Contributor
timestamp: November 12, 2013, 05:23:34 am
content: Quote from: Kryoclasm on November 12, 2013, 05:04:15 amSpot on !Congratz, I guess that you've just invented a new name for it, never heard of it in the electronic test & measurement world.

author: Unknown
author_rank: Unknown
timestamp: November 12, 2013, 05:49:18 am
content: Looks like they made the change to comply with the new limitations on exposed metal for CAT III/IV probes in the third edition of IEC/EN 61010 (see also the TL-175 and revision to the TL-71). If they would still be sold today, the old alligator clips would most likely be limited to CAT II.

author: AndyC_772
author_rank: Super Contributor
timestamp: November 12, 2013, 07:33:22 am
content: My 289 came with the newer design - purchased Aug 2012.

author: smoothtalker
author_rank: Regular Contributor
timestamp: November 12, 2013, 10:17:02 am
content: for my TL75 is the 1212 number on the test leads the date code?

author: retiredcaps
author_rank: Super Contributor
timestamp: November 12, 2013, 06:09:24 pm
content: Quote from: smoothtalker on November 12, 2013, 10:17:02 amYes.

author: BravoV
author_rank: Super Contributor
timestamp: November 13, 2013, 05:25:12 am
content: Quote from: alm on November 12, 2013, 05:49:18 amSmall changes yet good one, have to admit when every times I snugged in the alligator clips at tight spaces or dark/hard to reach spot, when the dmm in current mode, there was a bit worry the exposed metal might touch something and ... bang.Quote from: AndyC_772 on November 12, 2013, 07:33:22 amWhat is the manufactured date ? If you haven't calibrated it since the purchase or the cal counter still at 1, the cal date at the meter info is the date from factory.Looks like Fluke changed it somewhere in 2012.

author: mzacharias
author_rank: Frequent Contributor
timestamp: November 13, 2013, 12:42:11 pm
content: Looks like the new standard practice. Safer but less usable. Protect the idiots from themselves.

author: AndyC_772
author_rank: Super Contributor
timestamp: November 13, 2013, 12:50:20 pm
content: My meter's cal date was 9th Jan 2012.
Stupid Marketing Video - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: November 12, 2013, 03:02:42 am
content: Just found this marketing vid for the DS1074Z. Needless to say, it's kinda stupid.

author: Anks
author_rank: Frequent Contributor
timestamp: November 12, 2013, 03:23:09 am
content: lol

author: angst7
author_rank: Contributor
timestamp: November 12, 2013, 03:24:29 am
content: Needs more Zorro.

author: echen1024
author_rank: Super Contributor
timestamp: November 12, 2013, 03:53:26 am
content: What goes through the minds of marketing. *sigh*

author: c4757p
author_rank: Super Contributor
timestamp: November 12, 2013, 03:57:14 am
content: Quote from: echen1024 on November 12, 2013, 03:53:26 amIn a few cases like this, I suppose probably elevator music.

author: Bored@Work
author_rank: Super Contributor
timestamp: November 12, 2013, 05:44:55 am
content: When the background images are more interesting than the product ...From the background we learn Rigol engineers work in the entrance hall of some building, and Rigol has some crammed test/production facility, complete with motivation banner.

author: 1design
author_rank: Regular Contributor
timestamp: November 12, 2013, 08:39:48 am
content: You guys+the video made me lough to tears...and they really seem to record them working in their entrance hall

author: echen1024
author_rank: Super Contributor
timestamp: November 12, 2013, 01:31:12 pm
content: And is it just me, or is the oscilloscope NOT EVEN ON?

author: Bored@Work
author_rank: Super Contributor
timestamp: November 12, 2013, 06:26:07 pm
content: Quote from: echen1024 on November 12, 2013, 01:31:12 pmThat wouldn't be surprising. Rigol even offers power supplies that work without being turned onhttp://www.rigol.com/upload/13-03/01/1361524494.jpg

author: tszaboo
author_rank: Super Contributor
timestamp: November 12, 2013, 11:45:51 pm
content: I cant believe people get paid making silly videos and smoking weed all day.

author: steve30
author_rank: Frequent Contributor
timestamp: November 13, 2013, 03:29:52 am
content: Looks like a fairly typical marketing video to me

author: amyk
author_rank: Super Contributor
timestamp: November 13, 2013, 11:47:35 am
content: The marketing people might not be allowed where they do "real work", and thought "entrance hall is as good a place as any"...