hybridfree/eevblog-posts huggingface dataset:
BS1363 Compliance Tester - Page 1
Forum section: electronics / testgear

author: urbis
author_rank: Unknown
timestamp: May 09, 2016, 09:29:05 am
content: Morning all,Looking for a UK supplier of these:http://g03.a.alicdn.com/kf/HTB1vcmcIXXXXXaCXXXXq6xXFXXXG/BS1363-fingure5-metal-plug-gauge-for-British-market-test-gauges.jpgI used one at a previous employer to ensure that the PSUs/Plugs on products we were supplying are compliant with BS1363.Alternatively, if anyone has any other suggestions, please let me know.Thanks!
connecting two loads - repost (last one got sent early) - Page 1
Forum section: electronics / testgear

author: ctesla75
author_rank: Contributor
timestamp: May 09, 2016, 03:54:11 am
content: Hi All,I am interested in purchasing an programmable electronic load for R+D both at home and work. I would like a unit capable of 40 or 50 amps at about 400Watts, i cannot afford any of the units i have found but the lower 15Amp 150W or 30Amp 300W units are a bit closer to my price range .Can i start out with one of these units and add another unit when i can afford it and need it. Can they be connected together, will the reading be wrong or will it just not work.Thanks Ctesla75

author: digsys
author_rank: Unknown
timestamp: May 09, 2016, 04:33:12 am
content: If you are happy with using 2 units, then they work perfectly fine together. They have Open-collector type outputs, so each one won't really care ifthere are others connected. SOME Electronic load units can be slaved together though, so you have proper load sharing. Either way works.

author: ctesla75
author_rank: Contributor
timestamp: May 09, 2016, 07:54:43 am
content: thanks for the reply digsys it makes my decision much easier
connecting electronic loads together - Page 1
Forum section: electronics / testgear

author: ctesla75
author_rank: Contributor
timestamp: May 09, 2016, 03:50:38 am
content: Hi All,I am interested in purchasing an programmable electronic load for R+D both at home and work. I would like a unit capable of 40 or 50 amps at about 400Watts i cannot afford any of the units i have found but the lower 30A
JTAG In Circuit Test - Page 1
Forum section: electronics / testgear

author: MikeLogix
author_rank: Contributor
timestamp: May 07, 2016, 04:53:01 pm
content: I think this is the appropriate place to post this as it has to do with test and measurement.I am in need of a low cost JTAG ICT system developer Kit that will enable me to test boards from other designers ( all for legitimate purposes). I found this one and it looks like it will do what I need.http://www.jtagtest.com/To better explain, I want to do more than just use it to program a device, I need to toggle the I/O pins for testing and such.I was wondering if anyone else has used this unit, or perhaps you have one at a comparable cost that you could recommend. Much appreciated.

author: MikeLogix
author_rank: Contributor
timestamp: May 07, 2016, 08:25:02 pm
content: As an additional observation. I have noticed that most of the JTAG kits are device specific e.g. Xilinx, Lattice, Atmega etc. I think this has to do with the boundry scan files. Maybe some chip manufacturers keep their boundry scan files proprietary. The kit I listed above however, seems to disprove my theory. Anyone have a real answer as to why most kits are device specific?
Old Tektronix Oscilloscope Probes -- Anybody want 'em? - Page 1
Forum section: electronics / testgear

author: zipzit
author_rank: Newbie
timestamp: May 04, 2016, 05:20:47 pm
content: These came with an old oscilloscope. One of these is definitely broken. Anybody want 'em?Not sure if they can be repaired of not, but the components are sure nicely manufactured. I'm guessing someone here may know more.All I'd ask is you reimburse me actual shipping costs from me to you. (I presume via paypal )I'm in Las Vegas, Nevada, USA.--Zip.

author: cncjerry
author_rank: Unknown
timestamp: May 04, 2016, 07:57:36 pm
content: I'll take the one on the left if the tip is good. I actually just need the tip. You can throw both in a USPS flat rate box for $5.35. If you wan't I can send you a prepaid label.I'll send address via PM.thanks.

author: Alley_Cat_Jack
author_rank: Contributor
timestamp: May 05, 2016, 03:16:31 am
content: Aww darn, few hours too late. LolSent from my HTC One_M8 using Tapatalk

author: zipzit
author_rank: Newbie
timestamp: May 05, 2016, 05:42:56 pm
content: Jerry, Probes shipped. Pls check private messages for tracking info...

author: metrologist
author_rank: Super Contributor
timestamp: May 07, 2016, 03:09:17 am
content: Isn't that probe on the left a 350 MHz probe a good probe? O0

author: cncjerry
author_rank: Unknown
timestamp: May 07, 2016, 07:17:56 pm
content: Thanks again, zipzit, you are a prime example of the hobbiest brotherhood!
Are these cheapo ESR meters truly "in-circuit"? - Page 1
Forum section: electronics / testgear

author: Delta
author_rank: Super Contributor
timestamp: May 09, 2016, 10:48:33 pm
content: Has anyone got any experience of these meters?eBay auction: #191827984796Do they use a test voltage low enough such that they don't turn on any semiconductors and thus can be used without lifting a leg of the cap?There's also a plethora of those ATMega328 based multi component testers, can they be used to test ESR in circuit?

author: tggzzz
author_rank: Super Contributor
timestamp: May 09, 2016, 11:21:30 pm
content: Regardless of the voltage, any "in circuit" tester will be affected by surrounding components.For one example, consider power rail decoupled by two 100uF tantalums electrolytics and ten 100nF ceramics. If you measure across the leads of one tant, what will the ESR be?

author: Delta
author_rank: Super Contributor
timestamp: May 09, 2016, 11:39:10 pm
content: Quote from: tggzzz on May 09, 2016, 11:21:30 pm0.08263ohms?Yeah, I'm aware of the limitations, and parallel paths will always be an issue. I'm just looking for something that will give a quick indication of electrolytics in SMPSs above "it's not bulging so it's probably OK"!Maybe I should have phrased the question "do these use a voltage low enough that they won't blast through the diode bride and read zero ohms even if the cap is FUBARed?"
DP832 "Timer and Delayer" and templets - can it do AC? - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: May 06, 2016, 02:05:58 pm
content: Hi,Looking through the manual I noticed an area (page 2-15) that talks about Timer and Delayer and that there are things called templets that can build a waveform. Does this mean you can do AC voltage on the DP832. One of them is sinewave.Thanks,Alan

author: LaurentR
author_rank: Frequent Contributor
timestamp: May 06, 2016, 03:24:52 pm
content: Quote from: alank2 on May 06, 2016, 02:05:58 pmIf I remember correctly, the minimum time and granularity for each step is 1 second, so you can do AC, kinda (fractions of Hz).

author: alank2
author_rank: Super Contributor
timestamp: May 06, 2016, 07:11:44 pm
content: That would be pretty slow AC. I wonder if the templet can somehow make a wave where the times are sub 1s - what would be the point of making such a thing if it couldn't?

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: May 06, 2016, 11:21:30 pm
content: I think I remember seeing that if you control the voltage steps through the programming interface you can get a little better than 1 second, but not that much better. Still talking fraction of a hertz. While you can make something that kind of resembles a waveform, it in no way competes with a waveform generator. You would probably have more luck making something that looks like a waveform by just manually turning the voltage up and down.They have templets named things like sine, but because of the step granularity its not going to look (or be) anything like a real sine wave. More like a stair step waveform that kind of follows a sinusoidal like pattern. I briefly played with the templets when I first got my DP832 just to see whats its like, and again, its in no way a replacement for even the cheapest of waveform generators.

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: May 06, 2016, 11:29:48 pm
content: Quote from: alank2 on May 06, 2016, 07:11:44 pmActually, the use for the features is going the other way. 1 step/sec just happens to be the minimum you can set it to. People that would actually need the feature I'm sure would be setting the steps to be longer than 1 sec in most cases. The DP832 is a DC Power Supply, but you can still set it to ramp up/ramp down power to your circuit for testing purposes. Its not intended to replicate an AC Power Supply.

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: May 07, 2016, 12:39:08 am
content: From the Rigol DP800 User Guide Spec Section.I guess the fastest you could change steps programmatically would be the Command Processing Time plus the Voltage Programming Control Speed.

author: alank2
author_rank: Super Contributor
timestamp: May 07, 2016, 01:45:10 pm
content: Thanks, that clears it up all right!
Substantially over-spec'ed transformer on Agilent 6612C - Page 1
Forum section: electronics / testgear

author: Signal32
author_rank: Frequent Contributor
timestamp: May 06, 2016, 10:20:10 pm
content: Hello,I opened up my Agilent 6612C power supply for unrelated reasons and saw quite a hefty transformer in it.The transformer has a core cross section of 65mm x 55mm. This would give it a rating of aprox 675VAThe supply is suppose to deliver 20V, 2A = 40WSo let's assume 60W max load in order to be able to output 40W.Assuming 0.6 power factor, that would require a 100VA transformer.I was thinking they may just re-use the same transformer on multiple power supplies but even the 6611C/6613C have different transformers and the higher power supplies from Agilent also have other transformers which are much taller(completely different design) than the one inside the 6612C.Anyone have any idea what could be the purpose of having such a HUGE transformer ?Best!

author: pxl
author_rank: Regular Contributor
timestamp: May 06, 2016, 11:11:49 pm
content: Heavy is good.Heavy is reliable.If it doesn't work, you can always hit him with it.

author: pxl
author_rank: Regular Contributor
timestamp: May 06, 2016, 11:21:21 pm
content: However, it does not look to be over sized to much at all: "Input power: (full load): 1.6 A, 100 W (6611C: 2.2 A, 120 W)"

author: Signal32
author_rank: Frequent Contributor
timestamp: May 07, 2016, 01:17:41 am
content: True I under-estimated the max power draw.Now that I've tested it, the power draw is max 96W, let's say 100W.And the power factor is 0.8 at max load, and hangs around 0.75 at idle.So according to this a 125VA transformer would be enough, 5+ times less than the one included.PS I'm not saying it's bad or should have be done differently, I'm just curious why they went with this design.
Hioki 8835-01 Memory Hicorder, worth getting as a beginner oscilloscope? - Page 1
Forum section: electronics / testgear

author: TheAmmoniacal
author_rank: Unknown
timestamp: May 06, 2016, 12:47:24 pm
content: I have a very good offer on the table for an Hioki 8835 Hicorder with two 8936 analog units (i.e. 4 channels), is this a good choice for a beginner scope? I'm not very knowledgeable about this unit, and still not entirely sure what it is. As far as I can tell it's just an oscilloscope with a built-in printer? Meant to be used in the field I guess?Info and specifications here:https://dl.dropboxusercontent.com/u/15526481/docs/8835-01E12-91B-00P_web.pdfHow does it perform as an oscilloscope? What would be the bandwidth with those modules? Are the trigger options okay?It looks small/compact and portable, decent LCD screen, easy to use. What do you guys think about the unit as an oscilloscope?

author: tautech
author_rank: Super Contributor
timestamp: May 06, 2016, 01:17:18 pm
content: BW, well all you've got to go on is the model #.....35 MHz ?At least it has 400V inputsMost of its capabilities will be hidden in menus so unless you can trial it there's much that'll be left to chance.But it looks a nice clean tidy unit and if cheap enough could be well worth a punt.Without some documentation don't spend much on it.

author: TheAmmoniacal
author_rank: Unknown
timestamp: May 06, 2016, 07:47:16 pm
content: The specifications for the analog input unit is:Frequency characteristic:DC to 400 kHz ±3 dB (DC coupling)7 Hz to 400 kHz ±3 dB (AC coupling, low cut-off frequency: 7 Hz±20%)How does this translate to real-world usage? How will a 1 MHz sine look like?

author: Fungus
author_rank: Super Contributor
timestamp: May 06, 2016, 07:51:54 pm
content: Quote from: TheAmmoniacal on May 06, 2016, 07:47:16 pmIf the -3dB point is at 400kHz then there'll be almost nothing left at 1MHz.A square wave will suffer at much lower frequencies. A 100kHz square wave is probably about the limit of what you can look at and still see something reasonably square.Bottom line: It's areallycute looking device, but ... audio frequencies only.PS: How much are they selling it for?

author: TheAmmoniacal
author_rank: Unknown
timestamp: May 06, 2016, 08:12:24 pm
content: They are asking $180, which is still significant. And yeah, I'm skeptical of the limitations. Very niche product.

author: Fungus
author_rank: Super Contributor
timestamp: May 06, 2016, 08:42:41 pm
content: Quote from: TheAmmoniacal on May 06, 2016, 08:12:24 pmI'd say it's very useful if you're in a line of work where you have to measure a value over several hours/days.
Recovery disks for Agilent Infiniium DSO8000a oscilloscope ?? - Page 1
Forum section: electronics / testgear

author: maxtee
author_rank: Contributor
timestamp: May 06, 2016, 08:31:43 pm
content: Hi dear people of this forum,Does anyone know where to download the recovery disk images for the DSO8104a Infinitum oscillscope or if anyone kindly lend me this their recovery disks.Thanks'Mickey
UT70B PCB Photo - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: October 24, 2013, 11:49:05 pm
content: I've had my UT70B in bits for the last week or so while I try and learn more about the parts and how it works; so I thought I'd share a nice pic of the board if anyone is interested.

author: Hydrawerk
author_rank: Super Contributor
timestamp: May 10, 2016, 09:11:22 pm
content: At least there are some MOVs and PTCs present. Even a sparkgap.The voltage jack is well protected. But for fuse replacement you must open the DMM and remove the next 4 screws on the input jacks. That is crap. And the fuses are only 250V rated.

author: Hydrawerk
author_rank: Super Contributor
timestamp: May 10, 2016, 09:45:29 pm
content: I found some photos here.https://picasaweb.google.com/104378593109746079667/UT70BI am not an author of these photos. They were made byDavid Cadain May 2011.

author: Hydrawerk
author_rank: Super Contributor
timestamp: May 10, 2016, 09:47:39 pm
content: Another photo.

author: Hydrawerk
author_rank: Super Contributor
timestamp: May 10, 2016, 09:58:38 pm
content: http://mrmodemhead.com/blog/gallery/uni-t-ut70b-dmm/
Fluke 714 Issue - Page 1
Forum section: electronics / testgear

author: Mossy
author_rank: Newbie
timestamp: May 06, 2016, 09:58:04 am
content: A Fluke Thermocouple Calibrator with no sensor or wiring attached is giving a reading, on thermocouple range the temperature reading just floats around and sometimes reads OL which I would expect. On the mV input range it reads a fairly consistent 50-60mV.I have just paid for calibration i.e. it is now sealed.Is this normal behaviour for this instrument? Would you question its use where a calibrated instrument is mandatory?
Digital oscilloscope triggering and data collection question. - Page 1
Forum section: electronics / testgear

author: saint0r
author_rank: Newbie
timestamp: May 04, 2016, 10:15:12 pm
content: Hi,Recently I had to collect some data from a two way serial bus. Not going into specific details I had four signals,clock (1MHz) and TX and RX sent with this clock and one big enable signal when the transaction occurs.I have MSO 4104 (5 GS/s and 10M points buffer) and using logic probes I was able to trigger on enable signal.I found out that when using my horizontal setting and getting actually 5 MS/s i was able to get rather correctly clock and TX, RX (everything lower was getting rather bad results on pulse width of clock and data).Problem here is that transaction takes about 5s and time acquired with this setting is less (2-3 s - can't rember exactly).This means that I am not able to get and save whole TX,RX transaction.Is it possible to somehow overcome this issue ? I wasn't able to figure out if it's possible to put a logic probe sample every 1 MHz clock cycle (trigger directly on the clock and save every sample to a buffer - can't really say if digital scopes can work like that - although it seems pretty simple).Thanks in advance for any suggestions,Best,saint0r

author: ADT123
author_rank: Regular Contributor
timestamp: May 05, 2016, 04:35:56 am
content: As your clock is 1MHz you will need to sample at about the 5MS/s you mention so for the 4 channels thats 20 million samples per second. Over the 5 seconds you need 100 million samples. Actually you need a bit more as you may find 500 millisec/div not quite enough and need 1sec/div.Your scope does not have enough memory so you could use one of the streaming USB logic analyzers (https://www.saleae.com/) or if you need an analogue view of the data on a scope then Pico do some with >100M buffer memories (https://www.picotech.com/oscilloscope/3000/usb3-oscilloscope-logic-analyzer)

author: nctnico
author_rank: Super Contributor
timestamp: May 05, 2016, 07:41:34 pm
content: No segmented recording possible on the scope?
My new old Tektronix oscilloscope has a Bentley Nevada panel on it? - Page 1
Forum section: electronics / testgear

author: Alley_Cat_Jack
author_rank: Contributor
timestamp: May 04, 2016, 08:59:59 pm
content: Just picked up a lot of 3 analogue oscilloscopes, and I am unsure of what model this one is, because it has a Bentley Nevada panel on the top right where the Tektronix panel would tell me the model number.I'm pretty sure it's a 5000 series though.Sorry for the bad photo, I'll take a better one in a bit.Sent from my HTC One_M8 using Tapatalk

author: Alley_Cat_Jack
author_rank: Contributor
timestamp: May 05, 2016, 02:21:35 am
content: Sent from my HTC One_M8 using Tapatalk

author: Alley_Cat_Jack
author_rank: Contributor
timestamp: May 05, 2016, 02:42:41 am
content: Any idea of how to identify this old girl?Sent from my HTC One_M8 using Tapatalk

author: helius
author_rank: Super Contributor
timestamp: May 05, 2016, 02:54:30 am
content: the most fruitful avenue is probably to search the part numbers of both chassis halves: you can see them printed on the bottom right of both back panels. the top and bottom halves were semi independent, and there were many customized models for OEMs. So your scope may not correspond exactly to a catalog scope.

author: edavid
author_rank: Super Contributor
timestamp: May 05, 2016, 03:17:46 am
content: It looks like a version of the 5110 (aka 5103N/D10).

author: Alley_Cat_Jack
author_rank: Contributor
timestamp: May 05, 2016, 03:18:39 am
content: Ahh, didn't realize they are custom scopes for OEMs. That makes more sense. Documentation may be tricky to find though.Sent from my HTC One_M8 using Tapatalk

author: edavid
author_rank: Super Contributor
timestamp: May 05, 2016, 03:27:59 am
content: Quote from: Alley_Cat_Jack on May 05, 2016, 03:18:39 amNot custom, just mildly customized. The 5110 manual should be usable.

author: Alley_Cat_Jack
author_rank: Contributor
timestamp: May 05, 2016, 03:28:52 am
content: Awesome, thanks.Out of the 3 scopes I picked up, this was the only one confirmed working.Sent from my HTC One_M8 using Tapatalk

author: tautech
author_rank: Super Contributor
timestamp: May 05, 2016, 05:49:36 am
content: Quote from: Alley_Cat_Jack on May 05, 2016, 02:42:41 amThe numbers on the bottom of the plugins will allow you to Google the specs of each.Post them up please.

author: Alley_Cat_Jack
author_rank: Contributor
timestamp: May 05, 2016, 03:11:19 pm
content: There are two 5A19N and one 5B10N.I haven't looked for the documentation for these yet, but I'm sure it won't be hard to find.Sent from my HTC One_M8 using Tapatalk
Rigol DM3058e how do you select the thermocouple type? - Page 1
Forum section: electronics / testgear

author: BlueBill
author_rank: Regular Contributor
timestamp: May 05, 2016, 03:00:35 am
content: I've watched this DM3068 youtube review where around the 34 minute mark it shows different thermocouple types being selected. I can't seem to replicate this on my DM3058e.

author: cs.dk
author_rank: Unknown
timestamp: May 05, 2016, 07:19:29 am
content: If you look at this side-by-side view of specs, and scrool down to temperature. The DM3058E does not seem to measure temperature;http://www.tequipment.net/product-comparison/?Items=390476,397313

author: Wytnucls
author_rank: Super Contributor
timestamp: May 05, 2016, 10:50:57 am
content: It works for J,B,E,N,R,S and K-type TC, using the ITS90 reference tables. it also caters for PT100 and PT385 sensors.Simple 4 button push for a K type TC:Sensor - Load - File1 KITS90 - Readhttp://srdata.nist.gov/its90/download/type_k.tab
Fluke 8021B repair (not the screen) - Page 1
Forum section: electronics / testgear

author: staze
author_rank: Frequent Contributor
timestamp: May 04, 2016, 08:07:22 pm
content: All,I picked up a Fluke 8021B, and it's readings are all out of tolerance (can't cal to within tolerance). The manual doesn't give a lot of info on troubleshooting. It says what to look at, but it leaves out what normal results are. Like VR1 being bad, etc. But it doesn't actually say what the correct value is. Anyone have any tips for troubleshooting? From what I can find, there doesn't seem to be ANY tests that are within Cal, except shorting the leads together in resistance measurement.So the Vref or the main IC seems likely, but I'm curious if anyone has any tips on where to look, what normal values should be, etc.Thanks!

author: staze
author_rank: Frequent Contributor
timestamp: May 04, 2016, 10:01:17 pm
content: Damn, could a mod move this to the repair forum. My bad... totally didn't see it.

author: lowimpedance
author_rank: Super Contributor
timestamp: May 04, 2016, 11:27:42 pm
content: quick search has a fossile thread here;https://www.eevblog.com/forum/reviews/old-fluke-8021b-taken-apart/Might be interesting.One thing if not allready done is replace the minature electo's as they will leak and most definately affect the A/D and thus give funny readings.Next would be a thourough IPA clean and maybe twice paying attention to the area of the caps and also under the function switches.

author: staze
author_rank: Frequent Contributor
timestamp: May 05, 2016, 03:23:09 am
content: Brilliant. I had visually inspected and they looked relatively okay, but had noticed some corrosion around them. Figure I'd clean up later.When I pulled them to test, they were green. All measured way low (6uF). Thankfully I had purchased some extras (22uF 16v) caps when I previously recapped an 8060a.After pulling the caps, I scrubbed up the pads, and soldered the new ones in. They certainly fit better (amazing how capacitors have gotten so much smaller).Unit was still way off and I thought still busted, but turns out the cal pots have a bit of a downturn at the ends, so turning them back slightly from their extremes got it to go up more. So I was able to recal using my PSU (checked against Keithley 196) and Arb using instructions in the manual (200mV range, set each source for 191mV, and adjust). For AC (with the Arb/Function Gen), make sure source impedance is high, set frequency to 100Hz, and output to 191mVrms.Well done, sir, for guessing the cause. I'm just glad I had the caps... I hate ordering something like that and paying 5x the total in shipping. :[
Hameg  HM5006 - Page 1
Forum section: electronics / testgear

author: grant1842
author_rank: Newbie
timestamp: May 04, 2016, 11:31:58 pm
content: I have an Hameg HM5006 Spectrum Analyzer . I am looking for information on how to calibrate this nice spectrum analyzer.Thanks

author: Hydrawerk
author_rank: Super Contributor
timestamp: May 04, 2016, 11:39:14 pm
content: Send them an email.https://www.rohde-schwarz.com/service-support/customer_support_107711.htmlhttps://www.rohde-schwarz.com/general_information/hameg/rohde-schwarz-company_230166.html
Hantek DSO5202P lost AUTOSET. - Page 1
Forum section: electronics / testgear

author: mmachado
author_rank: Newbie
timestamp: May 05, 2016, 01:43:26 am
content: Dear forum members:I have been using my Hantek DSO5202P for a long time, recently I tried to use it with the OpenHantek application, and then it lost the AUTOSET function, anytime I try to AUTOSET using the calibrating square wave 1KHz from the front panel or any other signal I've got the screen of sc1.jpg attachment, we can see a wrong timebase have been selected and a wrong frequency measurement (4.594KHz), it is possible to triggering manually as we can see on picture SC2.jpg, but still there is a wrong frequency displayed. I suppose I have to reload the NAND file but I haven't a NAND backup. I konw Openhantek writes on NAND when using, first time I used it the the oscilloscope display a message of NAND backuping and then it blocked and need to restart. I appreciate any help or suggestion.Thanks in advance.
Kyoritsu KEW 1052   KEW 1062 - Page 1
Forum section: electronics / testgear

author: Moonage
author_rank: Newbie
timestamp: March 23, 2016, 03:36:56 am
content: Hello to everyone,I have spent quite some time searching for proper review of Kyoritsu KEW 1052, or KEW 1062 multimeters, but no luck.Anybody with a meter from that series willing to make a review?

author: Wytnucls
author_rank: Super Contributor
timestamp: March 23, 2016, 03:56:31 am
content: Watch this one, same meter.

author: Moonage
author_rank: Newbie
timestamp: March 23, 2016, 05:00:35 am
content: Thanks WytnuclsI have seen that one before...did not realize it is the same meter

author: AndersAnd
author_rank: Frequent Contributor
timestamp: May 04, 2016, 04:08:35 pm
content: Who's the manufacturer of these Kyoritsu KEW 1062 / Yokogawa TY720 multimeters? Kyoritsu making it for Yokogawa or vice versa? Is it sold under other brands too?

author: Wytnucls
author_rank: Super Contributor
timestamp: May 04, 2016, 05:25:38 pm
content: No real proof, but based on published company information, Yokogawa is most probably the manufacturer. I don't know of any other labels for these meters.Some lower priced Kyoritsu meters are made in China or possibly Thailand, since they have a KEW factory over there.
DSO5202P AutoSet. - Page 1
Forum section: electronics / testgear

author: mmachado
author_rank: Newbie
timestamp: May 03, 2016, 06:31:29 am
content: Hi....I'm the owner of DSO5202P Oscilloscope, It was doing fine a whole year but recently I tried to use OpenHantek Linux application with it, first I've got a message telling about EEPROM writting, the Oscilloscope restarted. Every thing still is doing fine but it lost the AUTOSET function, when I try to use this function it never triggers. I suppose something was changed on the configuration stored in the EEPROM that now is affecting the AUTOSET. Does anybody could help me please. I attached a screen capture.Martin.
Pomona lead package with Mueller clips - Page 1
Forum section: electronics / testgear

author: ADC-1995
author_rank: Regular Contributor
timestamp: May 02, 2016, 03:30:46 am
content: The other day I picked up a couple of alligator clip test leads and was surprised to find a Mueller lead inside a Pomona package??? These leads were hinted as older stock by the local distributor so I thought that Pomona may have owned Mueller or vise versa at some point in time and then branched off. But couldn't find anything suggesting that on the net.Anyone came across this before?

author: nanofrog
author_rank: Super Contributor
timestamp: May 02, 2016, 06:11:15 pm
content: There was a connection; the former owner, ITT Company, owned both Mueller Electric and Pomona Electronics. ITT then sold Pomona to Danaher in 1998, breaking that connection. They then sold Mueller to Desco in 2011.

author: Nauris
author_rank: Regular Contributor
timestamp: May 02, 2016, 07:23:55 pm
content: Year ago I got some Pomona banana sockets from Digikey and was suprised to find a PJP logo on them. I suppose Pomona just repagkages some products made by others.
My new Siglent Test Bench - Page 1
Forum section: electronics / testgear

author: MikeLogix
author_rank: Contributor
timestamp: May 01, 2016, 05:17:53 pm
content: Just received my brand new Siglent Test equipment this weekend. I am in the process of setting up an new addition to my lab and this equipment is the first of my upgrades. I even put in a new test bench to accommodate the equipment and the neat part is it colored matched by coincidence, so I will take that as a good omenI am taking things slow as I have much to do, but I will give this gear a honest review and post my results to the best of my ability. So far I am really impressed by the look and feel, and an overall sense of quality the equipment gives.The SDM3055 really looks sweet.

author: tautech
author_rank: Super Contributor
timestamp: May 01, 2016, 09:14:47 pm
content: We look forward to your comments Michael.QuoteWhat's under it looks even better.

author: Deuze
author_rank: Contributor
timestamp: May 02, 2016, 09:13:33 am
content: Expect to see your comments.
Unlocking 200MHz on Tektronix TDS2012C - Page 1
Forum section: electronics / testgear

author: dav
author_rank: Regular Contributor
timestamp: May 02, 2016, 01:45:28 pm
content: Hi all,is TDS2012C 100MHz scope hackable to 200MHz?The TDS2022C (200MHz) has 2GSa/s sample rate (same of TDS2012C), so I suspect the hack is possible.

author: tautech
author_rank: Super Contributor
timestamp: May 02, 2016, 08:52:24 pm
content: We had a look at this in this thread:https://www.eevblog.com/forum/testgear/tektronix-tds1000b-series-hacks/
HP 8153A optical connector type? - Page 1
Forum section: electronics / testgear

author: _Wim_
author_rank: Super Contributor
timestamp: April 21, 2016, 08:08:30 pm
content: I recently picked up an HP8153A fitted with an 81531A power sensor module very cheap (60€) to play around with. As my knowledge of optical connectors is extremely limited, I am unsure of the exact type of connector that is used. It looks exactly like this one:http://www.ebay.co.uk/itm/HP-8153A-LIGHTWAVE-MULTIMETER-2-81536A-POWER-SENSOR-OPTICAL-ANALOG-MODULE-/291723624700?hash=item43ec1540fc:g:JzgAAOSwxp9W7HXQBut the datasheet only mentions the fiber type (9/125), but no clear indication what type of connector this is. Googling around, I would think this is an "FC" connector, but I am not really sure. Many cables are listed as FC/PC, does this mean they would fit?Many thanks,Wim

author: _Wim_
author_rank: Super Contributor
timestamp: April 24, 2016, 05:36:53 am
content: Nobody knows this connector type? I want to buy some fiber optic cables to do some testing, but as there are soooo many choices, it kind of expensive to buy them all to test what fits (and maybe damaging the connector in the process...)

author: merox
author_rank: Regular Contributor
timestamp: April 24, 2016, 08:17:25 pm
content: Quote from: _Wim_ on April 24, 2016, 05:36:53 amThe Manual of the 8153A says it's a Diamond HMS-10 connector. The manual of your 81531A states the same:http://exodus.poly.edu/~kurt/manuals/manuals/HP%2520Agilent/HP%252081531A%2520User.pdf

author: _Wim_
author_rank: Super Contributor
timestamp: April 24, 2016, 08:50:26 pm
content: Many many thanks for this. I cannot download the manual you linked for some reason, but in the manuals I have found so far their is indeed some talk about this connector under "reference" conditions which I missed before. Thanks again!

author: _Wim_
author_rank: Super Contributor
timestamp: April 24, 2016, 09:11:00 pm
content: Found the correct link online. It is the same manual I already had, but I failed to notice the connector description in the reference conditions...

author: _Wim_
author_rank: Super Contributor
timestamp: May 01, 2016, 08:38:17 am
content: A quick update if any-one would need this info also later. The connector fitted on the unit is also not a HMS-10 Diamonds interface. It seems to be a proprietary connector from HP for which you can buy adaptors to fit to standard optical connectors (see pic for adaptor numbers). Luckily, searching on EBay I was able to find such an adaptor for a reasonable price.
Rigol DG1022 bootloader reprogramming per JTAG - Page 1
Forum section: electronics / testgear

author: Gunb
author_rank: Regular Contributor
timestamp: May 01, 2016, 03:16:02 pm
content: Hi there,any clue how to reprogram the bootloader per JTAG programmer onto a DG1022 function generator???Need help since update procedure failed although it was done as described by RIGOL update procedure.Can the .GEL file be used? Or must it sent to the service?RgdsGunb
The Uni-T UT139C and my power supply ripple - Page 1
Forum section: electronics / testgear

author: Martini
author_rank: Regular Contributor
timestamp: April 27, 2016, 01:37:42 pm
content: I thought I could use the AC range of my multimeter to check for any ripple on the output of a power supply (which I'm working on). Turns out it's not as simple as I thought:And the difference worsens if I increase the voltage:I also tried a frenquency measurement, I get 0 Hz (100 Hz on the scope, which is logical since main is 50 Hz here).All this with no load. It's worse with one.So, what's your take on that?

author: newbrain
author_rank: Super Contributor
timestamp: April 27, 2016, 03:48:35 pm
content: That's a known "feature" of some True RMS DMM, any DC offset will make the measure more or less useless.Other DMMs might give only the AC RMS value, and still others have a true AC+DC RMS mode (not what you are looking for).I think your UNI-T falls in the first category...as does mine (61D).My Fluke 87V*, instead, should ignore the DC offset and give just the AC RMS.They internally use the same True RMS converter (AD737), the difference is in the way it's coupled to the inputs.See, for example,this tread, where more complete explanations are given, and other UNI-T models are also discussed.A large enough capacitor in series will allow you to read the ripple RMS value by blocking the DC component.*Brag mode on: "Yes, my other DMM is a Fluke"

author: macboy
author_rank: Super Contributor
timestamp: April 28, 2016, 02:18:53 pm
content: The UT139C is known to be based on the DTM0660 IC. To measure AC RMS, this IC samples the signal and calculates the RMS value. The input signal is DC coupled even when on an AC range, and the DC offset is removed from the reading digitally. This means that in order to accurate measure AC ripple, you need to manually set the range so that the DC voltage is within the range of the meter. Only then can it sample without clipping. The problem with that is that the ripple may only be a few digits of this high range, making the reading rather worthless. To measure small ripple on a large DC voltage, you will need to AC couple the input. The high input impedance of the meter (10 Mohm) means that only a small capacitor is needed. You may get better results too if you shunt a 1 Mohm or even 100 kohm resistor across the input to reduce the input impedance. Some experimentation might be necessary.

author: mos6502
author_rank: Frequent Contributor
timestamp: April 28, 2016, 03:39:25 pm
content: Had the same problem:https://www.eevblog.com/forum/testgear/ut139c-ac-volts-weirdness/Lesson learnt, stay away from Uni-Turd.

author: Martini
author_rank: Regular Contributor
timestamp: April 30, 2016, 02:21:06 pm
content: Quote from: macboy on April 28, 2016, 02:18:53 pmThis is most interesting, thanks!(But that's because the input is DC coupled on the AC range, not because the chip is a DTM0660, right?)Quote from: macboy on April 28, 2016, 02:18:53 pmWhere would one learn more about AC coupling caps (how to choose the size)?mos6502, I'm sorry you had to learn it the hard way.
5 transistor esr meter - Page 1
Forum section: electronics / testgear

author: pete g
author_rank: Regular Contributor
timestamp: April 29, 2016, 11:36:21 pm
content: hi, I just completed the above project. not to sure if its working right. at turn on the meter pointer goes all the way to the right. this happens without shorting the probes. is this correct. scoping the output, I get a 94khz square wave at a pp of 90mv. when I short the probes the meter does not swing all the way to the left. need help. thanks. has anyone built this project?
Kikusui TOS5200 Signal IO  - Page 1
Forum section: electronics / testgear

author: captainscarlet
author_rank: Contributor
timestamp: April 27, 2016, 06:35:18 pm
content: So I've recently gotten a Kikusui TOS5200 dielectric tester for a project at work.I need to write a simple program to test our dielectric jig using the signal IO sub-D port at the back.The datasheet says an input high is 11-15V and input low is 0-4V, so I expect it's looking for a 12V signal. Usually in my experience, there'd be a 12V source on the sub-D port that I can tap into if I wanted to use switches to control the inputs, but this has a 24V source on the back according to the data sheet. (pg 54-55 for those who are interested:http://www.kikusui.co.jp/kiku_manuals/T/TOS5200/English/TOS5200_USER_E.pdf)It seems strange to provide a 24V pin, when inputs are limited to 15V.It's an expensive piece of kit, so I don't want to mess with it.Anyone have any experience or see this before?

author: Performa01
author_rank: Super Contributor
timestamp: April 29, 2016, 08:50:23 am
content: No experience with this particular device, but from the specs its not required to apply a voltage at all, since there is an internal pull-up to +12V. That means, leaving the input open equals logic high.In order to get it to logic low, just switch the input to ground.

author: captainscarlet
author_rank: Contributor
timestamp: April 29, 2016, 02:06:00 pm
content: Yep, figured that out after rereading the data sheet.Internal pull ups, just need to bring the line low.Rookie mistake.
Vintage "Portable oscilloscope"  - Page 1
Forum section: electronics / testgear

author: Miyuki
author_rank: Frequent Contributor
timestamp: April 29, 2016, 03:01:22 pm
content: Hi I want to present you nice "Portable oscilloscope" it weight just 15Kg and can be powered from external 12V batteryAnd it still works sometimes(when ghosts in this tubes and tunnel diodes are in good mood)

author: Hydrawerk
author_rank: Super Contributor
timestamp: April 29, 2016, 05:03:50 pm
content: A scope made by Tesla in Czechoslovakia.

author: ebastler
author_rank: Super Contributor
timestamp: April 29, 2016, 05:48:45 pm
content: Very nice!Do the knobs glow in the dark?

author: TinkerFan
author_rank: Regular Contributor
timestamp: April 29, 2016, 05:59:02 pm
content: Did you restore it? Looks pretty good, especially the CRT...

author: Fungus
author_rank: Super Contributor
timestamp: April 29, 2016, 07:14:09 pm
content: Quote from: ebastler on April 29, 2016, 05:48:45 pmIf they do it's probably because they're made of Radium.

author: Miyuki
author_rank: Frequent Contributor
timestamp: April 29, 2016, 08:05:11 pm
content: Knobs dont glowIt wast mostly just disassembeld and cleaned
Wiltron 562 software upgrade - Page 1
Forum section: electronics / testgear

author: jfphp
author_rank: Regular Contributor
timestamp: April 28, 2016, 05:12:56 pm
content: Hello,I have a Wiltron 562 scalar analyzer with software rev 3.1 but it doesn't run with the 68XXXB and 69XXXA sources. I have found on the Net the rev 4.1 upgrade but unfortunately it needs 6 x 256K EPROM. My CPU card has only 4 x 512K and, of course, doesn't run with 6 X 256. Any help ? Thank you.
nvidia chip failure detection lab. - Page 1
Forum section: electronics / testgear

author: firepower
author_rank: Regular Contributor
timestamp: April 27, 2016, 08:38:22 am
content: Exclusive behind the Scenes tour of Nvidia’s Failure Lab!What do Nvidia do when one of their chips fails? They send it to Howard Marks, Director of Technology operations, Silicon Failure Analysis lab, where they use millions and millions of dollars worth of insane equipment to find the single transistor that failed!

author: Solder Fumes
author_rank: Newbie
timestamp: April 27, 2016, 09:44:21 am
content: Thanks for posting this. They have some amazing lab equipment and very skilled engineers!
Wich simple electronic load should i get? - Page 1
Forum section: electronics / testgear

author: PeterFW
author_rank: Frequent Contributor
timestamp: April 26, 2016, 11:56:20 pm
content: Hello!In the past months i have been twiddeling with a lot of power supplys and battery circuits and i allways run into a problem... i need a load.So the time has come to retire my bucket of kanthal wire and power resistors, i need to do this properly.Designing my own is out of the question at the moment, i can not get side tracked, though i can build and etch from ready made plans.But... i can not spend a ton of money.0-12V (maybe 24 would be good)0-10A (20 would be nice)mA resolution would be awesomeconstant power would be nice but not a mustaround 40 Euros would be goodWich one of the many out there would you recommend?My favorite so far, since i have a display and arduino around would be this one:http://www.kerrywong.com/2013/10/24/building-a-constant-currentconstant-power-electronic-load/But it leaves still a decent amount of design work out.
Oscilloscope calibration in a hurry - Page 1
Forum section: electronics / testgear

author: EI6JA
author_rank: Newbie
timestamp: April 26, 2016, 06:30:39 pm
content: Hello,I have an opportunity to use a oscilloscope calibrator for a half an hour, during a lunch break, to check out my analog oscilloscope. Given the fact that I have never calibrated a oscilloscope before and have limited time what should I prioritize while I have access to this test equipment? I do not think I will have enough time to do a full performance check and adjustment. My first guess would be to check the vertical deflection followed by the horizontal time base, or should I look at the trigger, the cal output, XY mode, bandwidth etc.Regards,Stephen

author: nicnac117
author_rank: Contributor
timestamp: April 26, 2016, 08:26:59 pm
content: You will need to follow the calibration procedure in the relevant manual to the scope you have.Its not somthing to be rushed and you may do more damage than good by adjusting willy nilly .......30 minutes may be enough for an experienced tech who has done it multiple times with the same equipment . It would take that long to familiarise yourself with the equipment .

author: tautech
author_rank: Super Contributor
timestamp: April 26, 2016, 08:29:24 pm
content: Welcome to the forum.Familiarity with the process as described in the Service manual is key to success as there's normally a large # of steps to do a cal properly.Mostly you are wanting to check signal amplitude accuracy and frequency accuracy, both as sanity checks to know your scope is reasonably accurate.Dave did a quick check on a Hameg, IIRC it was #502.http://www.eevblog.org/video/

author: Rerouter
author_rank: Super Contributor
timestamp: April 26, 2016, 08:32:25 pm
content: I would write down and photograph the deviations between your scope and the calibrator, this will show you what signals you would need to replicate, and where to initially set them to calibrate your scope later on with other tools,E.g. you see at 20V DC its about 0.5V low, well record it and later when you have the time you know to feed in 20V and calibrate for it, If your feeding in a 100Khz signal and you see you only measure 96Khz counting the graticules, then when you have time feed in 100Khz and calibrate it,

author: EI6JA
author_rank: Newbie
timestamp: April 26, 2016, 09:01:13 pm
content: Quote from: tautech on April 26, 2016, 08:29:24 pmThanks for the response everyone. A sanity check for reasonable accuracy is what I will do. I have looked through the calibration process in service manual and it has quite a lot of steps, I think some of the steps can be accomplished with a normal signal generator for example trigger etc. I plan to just run through the vertical channels with accurate amplitude standard and the horizontal with accurate time mark generator. This oscilloscope is only for hobby use but the chance to check it against a proper standard is something I cannot turn down.Thanks,Stephen
Agilent DSO-X 2014A noise - Page 1
Forum section: electronics / testgear

author: iAleks
author_rank: Regular Contributor
timestamp: April 25, 2016, 06:55:56 pm
content: Hello everyone.Apologies for the Google translation.There is a problem with AGILENT dso-x 2014A when the backlight is turned on, the oscilloscope is very noisy something like SHSHSHSHSHSHS. it's crazy.Here video listening to headphones:https://youtu.be/VkEOQRTtZn8And noise on +23V (0.1Volt/Div, 10usec/div):https://youtu.be/VGi4a_MpxGMThe sound comes from the inductor L3200 or L3201 when touch a finger to capacitor between inductors, or the right contact inductor L3200 or left contact L3201 sound disappears.I changed the two resistor 11R to 33R, and put the capacity 0,01u between 5 pin and near ground point, and noise gone. I did the right thing?Has anyone encountered this?

author: hs3
author_rank: Regular Contributor
timestamp: April 25, 2016, 07:14:56 pm
content: Seems like the same issue was discussed here couple months ago:https://www.eevblog.com/forum/testgear/agilent-oscilloscope-mso-x-2012a-audible-high-pitched-sound-and-hiss/

author: TheSteve
author_rank: Unknown
timestamp: April 25, 2016, 07:17:14 pm
content: Well known issue - read the service note:http://literature.cdn.keysight.com/litweb/pdf/DSOX2004A-03.pdf

author: iAleks
author_rank: Regular Contributor
timestamp: April 25, 2016, 07:20:43 pm
content: Thanks!

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: April 26, 2016, 05:54:24 pm
content: Good luck!

author: iAleks
author_rank: Regular Contributor
timestamp: April 26, 2016, 06:45:44 pm
content: Apply the fix, that is now all is well and... silence... beautiful.
.TIQ MDO4104B-6 WLAN captures imported into SignalVu-PC 3.7 - problem no more - Page 1
Forum section: electronics / testgear

author: jopki
author_rank: Newbie
timestamp: April 26, 2016, 02:36:29 am
content: ... originally I had a question on what I suspected could be an MDO HW problem but I have figured it out - turned out to be an MDO NEWBIE issueWanted to delete this message but the system did not allow me to. Please disregard. thanks.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: April 26, 2016, 06:33:02 pm
content: I think it would have been much better if you just left the original question in place and posted a follow-on reply explaining what the solution was instead. This way it could have helped others who in the future might find themselves in a similar situation.Oh well...