hybridfree/eevblog-posts huggingface dataset:
Replacement LCD film for fluke meter - Page 1
Forum section: electronics / testgear

author: John Coloccia
author_rank: Super Contributor
timestamp: November 16, 2014, 03:56:38 pm
content: Anyone know where to get another LCD protective film for a Fluke meter? Mine finally got messed up after almost 20 years of use (left it in my care during the summer...that did it). I know people use the cell phone ones, but the Fluke one is very heavy duty and I'd prefer the original.Thanks!

author: retiredcaps
author_rank: Super Contributor
timestamp: November 16, 2014, 06:43:38 pm
content: You didn't specify which meter, but seller a-fluke on ebay has some.http://www.ebay.com/itm/331352967309http://www.ebay.com/itm/331325557203

author: John Coloccia
author_rank: Super Contributor
timestamp: November 17, 2014, 05:46:53 am
content: Thanks for the links. It's for a Fluke 85. I didn't even think to check Fleabay. I was hoping there was some real supplier out there that sold these things. I can't imagine why I have to resort to ebay instead of buying them through a Fluke dealer. Oh well
Rigol DS1104Z-S Firmware Help - Page 1
Forum section: electronics / testgear

author: gnif
author_rank: Unknown
timestamp: November 14, 2014, 01:02:02 pm
content: Hi All,I bought a DS1104Z-S around a year ago and I am trying to obtain a firmware update for it, it seems that the current firmware version on the scope is ancient and missing features, and also has a bug that causes the keypad to completely lockup if a certain order is followed (Ch1 On, Ref On, Ch1 Off). It has firmware 00.02.00.SP1 on it, but I believe the latest is 00.04.00.SP2. I have requested a firmware update from Rigol but never heard back from them, any chance anyone here would be kind enough to share the update if they have it?

author: edavid
author_rank: Super Contributor
timestamp: November 14, 2014, 09:57:16 pm
content: You could try this until you find the SP2 version:http://gotroot.ca/rigol/DS1000Z-04_00_00_00.7z

author: extide
author_rank: Regular Contributor
timestamp: November 14, 2014, 10:39:09 pm
content: How did you get that scope a year ago? Didn't it just come out?

author: nanofrog
author_rank: Super Contributor
timestamp: November 14, 2014, 10:56:01 pm
content: Quote from: extide on November 14, 2014, 10:39:09 pmYou're thinking of the 50MHz model.Rigol introduced the 100MHz and 70MHz versions of the 1000Z family first.

author: nanofrog
author_rank: Super Contributor
timestamp: November 14, 2014, 11:07:41 pm
content: Quote from: gnif on November 14, 2014, 01:02:02 pmMight want to try the US site'sFirmware Update Requestpage, and see if that doesn't get you positive results.

author: gnif
author_rank: Unknown
timestamp: November 15, 2014, 02:54:12 am
content: Correct, this scope has been on the market for over a year now, the new model is the exact same machine, just bandwidth limited to 50MHz.I did use the firmware request page a while back but I never got a response. I contacted the tech support line directly as suggested by a friend and I was emailed a link to the latest firmware this morning.For the record, as of writing the latest version is: 00.04.01.SP2 (or as in the file iteself, 00.04.01.02.00)

author: edavid
author_rank: Super Contributor
timestamp: November 15, 2014, 03:20:13 am
content: So what's the link?

author: gnif
author_rank: Unknown
timestamp: November 16, 2014, 05:16:07 am
content: Quote from: edavid on November 15, 2014, 03:20:13 amI am not sure I want to forward the link as it seems to be tied to the ticket that was opened, which is linked to my device serial number.
Rigol DS1052E channel 2 failed - Page 1
Forum section: electronics / testgear

author: jms2
author_rank: Newbie
timestamp: November 10, 2014, 10:06:58 pm
content: Hello,I've got a frustrating problem with my Rigol DS1052E which I have owned for nearly 2 years now. It has had little use because I'm an electronics newbie, and on reflection I'm pretty sure that the problem with Channel 2 has been there since the very beginning - I just decided it was probably me doing something wrong!Anyway, the problem was originally a lot of very high frequency noise on Channel 2. Swapping probes (or removing them) did not make any difference, but switching to a longer timebase did make it go away.Now that I've decided it must be a real problem, Channel 2 now only flatlines - I get nothing at all on it. I'm pretty certain that something is broken.I have tried approaching Rigol's UK distributor (Telonic) to make a warranty claim, but they referred me to Rigol in Germany. They won't help because I bought it from a non-approved supplier apparently. Telonic won't offer to repair it even in exchange for money (!) so I'm stuck.My questions are:1) Can anyone recommend someone who can repair it (for money).2) Alternatively, do I have any chance of repairing it myself?John

author: JoeO
author_rank: Frequent Contributor
timestamp: November 11, 2014, 03:28:01 am
content: First, turn on your country flag so readers will know where you are.Second, here are the schematics from dave's links;http://rigol.codenaschen.de/index.php/SchematicsThird, You may need another scope to fix your 1052.Fourth, because of the price of a new 1054Z, it may not be worth putting too much money into your 1052. You will have to decide.

author: jms2
author_rank: Newbie
timestamp: November 11, 2014, 08:37:40 am
content: Hi, thanks for the reponse. Figured out how to display where I live - obviously that's relevant for potential repair sites!I should add that I have not done the 100Hz mod (or any other mods) to this scope. If it is a hardware fault (as I suspect) then it has been present since build.I'm hoping it is something as simple as a dry joint, because I'd potentially be able to fix that.

author: saturation
author_rank: Super Contributor
timestamp: November 12, 2014, 12:27:21 pm
content: Drieg is on eevblog, the question is is it worth the cost to ship it to him?Repairing it yourself only you can answer that. Even if you diagnose the problem, can you replace the part?Channel failure is a good bet for successful repair because you can say inject a 1kHz signal into channel 1 and 2, use your DMM counter to check the signal path flow and compare channel 1 and 2 side by side. Whatever is missing is probably a fault.It could be something as simple as a loose connection than a full part failure.

author: jms2
author_rank: Newbie
timestamp: November 14, 2014, 08:56:40 pm
content: Thanks, thats useful. I think it could well be a loose connection, and if so I can probably fix it. If it is something else then I can't fix it, but what I've concluded from the responses on here is that scope repair is not a readily available service!
Rigol DM3058E - crap continuity testing - Page 1
Forum section: electronics / testgear

author: Macbeth
author_rank: Super Contributor
timestamp: November 13, 2014, 11:59:32 pm
content: So far I've been fairly happy with my DM3058E 5 1/2 digit bench meter. But today I had to do a lot of continuity checking at my bench. Is it just my meter, or is the "buzzer" the most pathetically inaudible device on the planet? I mean even a shitty £5 throwaway meter seems to have a louder piezo sounder than this thing.Also, the ohm sensing is very rapid (great!), but why is the buzzer not latched? It's just crackling as well as near inaudible. Is there a firmware update for this?I've noticed Rigol have plenty of updates for their PSUs and 'scopes, but I haven't seen a single one for this meter.Version 01.01.00.02.01.00

author: pa3bca
author_rank: Regular Contributor
timestamp: November 14, 2014, 12:05:48 pm
content: Quote from: Macbeth on November 13, 2014, 11:59:32 pmNo, it is not just your meter. The continuity meter/buzzer is a joke (the rest of the meter is excellent though).The buzzer here sounds like it some sort of wimpy 700 Hz 100% modulated with 50 Hz or thereabouts. Useless for me, I do not use it.

author: mcinque
author_rank: Unknown
timestamp: November 14, 2014, 12:53:48 pm
content: yes, it's quite ridiculos. I guess it could be changed with another frequency in the firmware.
RIGOL lacks from quality PC software ? - Page 1
Forum section: electronics / testgear

author: SimonD
author_rank: Regular Contributor
timestamp: November 13, 2014, 02:15:14 pm
content: As i look in similar posts and my own expirience from 1054z my opinion is YES! ,... which is a shame because the instruments are in high level on the money they seek.I am one step behind buying a DP832 power supply and when i am ready to press the button to proceed i think about it again because of this. (Anyway, probably i do it!)Fortunately there are some guys here who do a very very good job as marmad the great utility RUU ...(BTW congratulations and I hope we have soon a working version for 1000z series).But I think this is a job that will soon need to upgrade the RIGOL for its products.

author: motocoder
author_rank: Unknown
timestamp: November 13, 2014, 04:28:55 pm
content: They certainly lack in the areas of product QC and customer service/support. Today marks the 3rd week waiting on them to repair my DS2072, which was locking up every few minutes. I can't even get them to respond to my emails, much less make good on their warranty, which specifically says they will provide a loaner if service takes more than 10 business days.You get what you pay for. I would actually encourage individuals to save up a little more money and buy a low end or used Keysight/Agilent or Tektronix instead. Companies should fork over the cash for a real scope as you are going to lose way more than you save the first time the thing goes down.

author: coppice
author_rank: Super Contributor
timestamp: November 14, 2014, 04:23:33 am
content: Quote from: motocoder on November 13, 2014, 04:28:55 pmSo, your solution to a less that stellar response to a warranty claim is to recommend not have any warranty at all?If a Keysight or Tektronix scope needs a specialised part for you to fix it yourself, you could be wishing you had a scope with a more throw away price tag.
Philips PM5390 signal generator, anyone have an operating manual? - Page 1
Forum section: electronics / testgear

author: KJDS
author_rank: Super Contributor
timestamp: November 12, 2014, 11:55:41 am
content: I've just started testing a Philips PM5390 signal generator, and all is fine except when I press the button for FM modulation the LED flashes and nothing else happens. Does anyone have an operating manual? I suspect that something needs to happen to define deviation,
Need help buying graphical multimeter - Page 1
Forum section: electronics / testgear

author: Ebivetar
author_rank: Contributor
timestamp: November 10, 2014, 02:09:56 pm
content: HelloI am looking to buy DMM with graph function. I am aware that Fluke and C&A have some really good meters.Are there any similar meters in the market?Your opinions are welcomed.

author: robrenz
author_rank: Super Contributor
timestamp: November 10, 2014, 02:39:07 pm
content: Bench or hand held or both and budget?

author: AndyC_772
author_rank: Super Contributor
timestamp: November 10, 2014, 03:12:59 pm
content: What's it for?I have a Fluke 289, which did an excellent job of what I needed at the time, which was a unit to log the battery voltage of a vehicle over a period of time. Rather than just sampling at regular intervals and storing the results, it's constantly looking out for the maximum and minimum readings within each sample interval, and any significant change in the measurement causes additional data points to be logged as well.What all this means, is that you can set it to log infrequently in order to save memory and avoid getting an excessive amount of data to have to wade through, yet it'll still pick up on spikes and other abnormalities. This behaviour makes it a very useful tool, yet it's not particularly well explained, and it took me a while to figure out what it was doing.I'd certainly rate it as excellent for data logging purposes. As a general purpose meter, though, I find its start-up delay annoying, and the display contrast isn't nearly as good as it should be. It's not my everyday multimeter for this reason; instead I use an older Fluke 89-IV, or a Keithley bench meter.

author: electronic_eel
author_rank: Regular Contributor
timestamp: November 11, 2014, 10:47:38 pm
content: Take a look at the Agilent/Keysight 34461A. They have really good specs for 6.5 digit bench meters and good graphing and statistics functions.Dave has done a review video IIRC.
Keithley 2015 2000 beep on key press - Page 1
Forum section: electronics / testgear

author: Magnum
author_rank: Regular Contributor
timestamp: November 11, 2014, 07:04:59 pm
content: Hello,today I received my new to me Keithley 2000 to acompany my 2015. What I like about the 2015 is that it beeps shortly when I pess a key on the front. The 2000 doesn't, I searched in the manual but didn't find anything to enable it. Is it possible to enable such a "key press beep" on the Keithley 2000? It has rev a20.Many thanks.

author: Magnum
author_rank: Regular Contributor
timestamp: November 11, 2014, 07:11:19 pm
content: I found it in the manual, just had to search for the right phrase: Key click...
rigol ds2072a factory reset - Page 1
Forum section: electronics / testgear

author: Xplosiv166
author_rank: Newbie
timestamp: November 14, 2014, 01:13:59 pm
content: Hi all,Is there a way to remove a license from a Rigol DS2072A, that has been installed on the scope (i.e. advanced triggers etc..) by maybe doing a factory reset or similar?Thanks

author: dogcatdog
author_rank: Newbie
timestamp: November 16, 2014, 08:08:29 pm
content: to uninstall options use the ultra sigma scpi panel there is a SCPI command I think. :system:option:uninstallthis removes all options according to some docs.
PC Software for Agilent DSO-X 3000A series scopes Arb. Generator - Page 1
Forum section: electronics / testgear

author: trevwhite
author_rank: Frequent Contributor
timestamp: November 09, 2014, 07:46:12 pm
content: Anyone recommend a PC application ( prefer it to cost nothing ) to enable me to create arb waveforms for Agilent DSO-X 3000A scopes arb. generator?ThanksTrev

author: alex.forencich
author_rank: Frequent Contributor
timestamp: November 10, 2014, 12:36:43 am
content: One option is numpy + python-ivi. This may be a bit lower-level than what you are looking for as it doesn't have a nice eye-candy graphical waveform editor, but it does get the job done.

author: HighVoltage
author_rank: Super Contributor
timestamp: November 10, 2014, 08:58:23 am
content: On the Agilent ARB generator, like the 33500B Series, you can use a simple Excel spreadsheet and import it. Maybe it also works on the DSO-X3000? I am not sure.

author: eurofox
author_rank: Unknown
timestamp: November 10, 2014, 09:13:47 am
content: Quote from: HighVoltage on November 10, 2014, 08:58:23 amYes you can import a CSV file, check the viodeo.http://www.keysight.com/upload/cmc_upload/All/AWG-EN-640X360.mp4

author: trevwhite
author_rank: Frequent Contributor
timestamp: November 10, 2014, 12:08:20 pm
content: Thanks, i had seen the csv import bit but just hoped maybe there was some GUI based tools already.The help section on the scope said there was a basic version of Benchlink tool but I can only find the pro version on the site.

author: trevwhite
author_rank: Frequent Contributor
timestamp: November 10, 2014, 12:08:45 pm
content: Does anyone have a oopy of the basic version ?

author: mkissin
author_rank: Regular Contributor
timestamp: November 10, 2014, 05:52:01 pm
content: The unlicensed Benchlink Pro is the basic version. It's almost like a trial mode. That tripped me up for a while too.
Hacking of Siglent SDG1000 AWG - Page 1
Forum section: electronics / testgear

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: May 25, 2014, 05:21:04 pm
content: Hi All,Has anyone made any progress with hacking the SDG1000 series of AWGs from Siglent?I ask as I would like to 'convert' my SDG1020 into a SDG1025 as the SDG1020 doesn't have a LeCroy counterpart and when using the LeCroy firmware the model number field is empty.

author: Warhawk
author_rank: Frequent Contributor
timestamp: November 10, 2014, 11:50:59 am
content: I would like to make this topic alive again.Searching for used AWG I found an offer on auction portal where someone sells functional SDG1005 flashed to SDG1050 probably (he claims that gen. goes to 50MHz).Does anybody know any details ?I've already ask him for a serial number.

author: nctnico
author_rank: Super Contributor
timestamp: November 10, 2014, 11:55:04 am
content: I would be careful with that. The versions with a higher bandwidth have a fan.

author: Warhawk
author_rank: Frequent Contributor
timestamp: November 10, 2014, 12:49:40 pm
content: Quote from: nctnico on November 10, 2014, 11:55:04 amYes, you are right. Serial number is SDG0003120555. I will ask the guy for more information regarding this.
Looking for a Wavetek model 90 maintenance/service manual - Page 1
Forum section: electronics / testgear

author: nightmechanic
author_rank: Contributor
timestamp: June 09, 2014, 08:02:16 am
content: I am attempting to repair a Wavetek Model 90 function generator and could not find the manual anywhere.Even the ones i found advertised on Ebay for a ridiculous price (~100$ incl. shipping) are for a model 95...Tried to contact Fluke as well, no luck yet.Any help would be appreciated!thanks,Ran

author: richhas
author_rank: Unknown
timestamp: June 30, 2014, 05:36:28 am
content: Well funny enough I'm in the same boat as you... Mine supposed to be working but have received it. I did track down the model 90 manuals and just ordered it... I found it here:http://ridgeequipment.com/store/manuals/detail.php?id=17458--- Just ordered tonight and should have it in a few...Good luck,Rich

author: seswier
author_rank: Newbie
timestamp: November 10, 2014, 01:03:59 am
content: I don't know if you're still looking for the Wavetek 90 manual. I haven't been able to find one either, but what I have found is that there are a lot of similarities between the Wavetek 90 and Wavetek 288. The manual for the Wavetek 288 is available online.A common problem that I have found in the 288 and the 90 is that relays tend to go bad, which causes calibration errors. The relays don't fail completely, but the contact resistance will be >3 ohms, instead of being close to zero.
One can never have enough handheld multimeters... - Page 1
Forum section: electronics / testgear

author: Stefan .
author_rank: Contributor
timestamp: November 07, 2014, 04:41:59 pm
content: ...besides the benchtop ones, of cause!

author: robrenz
author_rank: Super Contributor
timestamp: November 07, 2014, 09:05:58 pm
content: How abouthereorhereorhereall from the same thread?

author: dfmischler
author_rank: Frequent Contributor
timestamp: November 07, 2014, 09:43:34 pm
content: I, on the other hand, do not put all of my test equipment in one place, so that my wife has no idea how many items I actually have.Isn't that the reason for having an office, shop and warehouse at work, plus a basement, office and workshop (in the barn) at home?

author: jancumps
author_rank: Unknown
timestamp: November 07, 2014, 09:48:57 pm
content: Quote from: Stefan . on November 07, 2014, 04:41:59 pmI dig the Grundig one.
InCircuit ESR Meter - Page 1
Forum section: electronics / testgear

author: janengelbrecht
author_rank: Regular Contributor
timestamp: November 07, 2014, 12:13:07 am
content: Im looking for an incircuit ESR meter that actually works: Which works at voltages low enough so they wont trigger any semiconductors on the PCB where one is meassuring ESR in a cap.I have narrowed my search down to this:http://www.ebay.com/itm/Digital-ESR-Meter-Test-In-Circuit-Electrolyte-Capacitor-Resistance-0-01-30-Ohm-/261350478205Anyone know this meter ?

author: mathsquid
author_rank: Frequent Contributor
timestamp: November 07, 2014, 12:51:51 am
content: I have a meter that looks mostly the same, but has red and black banana jacks on the side. I don't have anything to compare it to, but it seems okay. The attachments have pics that show the meter's test signal. (How do you include pictures inside a post?)

author: janengelbrecht
author_rank: Regular Contributor
timestamp: November 07, 2014, 01:08:27 am
content: Yir it looks much the same. Thx for the pics. I can see the voltage is okay for incircuit analysis

author: zaoka
author_rank: Frequent Contributor
timestamp: November 07, 2014, 04:33:51 am
content: That new version may be using 4 wire measurement method?

author: janengelbrecht
author_rank: Regular Contributor
timestamp: November 07, 2014, 12:55:24 pm
content: Seems legit..... something like this (only with a microcontroller instead):

author: DanielS
author_rank: Frequent Contributor
timestamp: November 07, 2014, 06:58:06 pm
content: Quote from: janengelbrecht on November 07, 2014, 12:13:07 amUnless you can isolate the component you want to test, you have to take your in-circuit measurements with a fistful of salt since your measurements will include effects from other components in parallel including alternate series paths between your measurement points. Not suitable for much more than sanity-checking - you are basically measuring the Thevenin/Norton equivalent of your circut as seen from your test points assuming active components are open-circuit.
Keithley 417 pico ammeter teardown - Page 1
Forum section: electronics / testgear

author: uoficowboy
author_rank: Regular Contributor
timestamp: November 07, 2014, 01:25:26 am
content: I recently acquired a Keithley 417 pico ammeter. I think you all will appreciate it. It is a very cool piece of old school equipment. I imagine it was very costly many years ago. It supports full scale ranges from 30ua to 100fa in 18 different ranges. At any range, a full scale input will have a 1mV drop. Yowza.The top sets of knobs set the full scale range that it is measuring. The bottom set of knobs sets a current that is being subtracted or added from the input current. So this way, you can have a 1.0-1.01ua current that you are interested in, then you can subtract 1ua, and then put the device on a 10na full scale range. Pretty cool.Full size pics here:http://imgur.com/a/SvEO0- but I've added captions to quarter size pics below:How it looks with clothes on:The top comes off after you rotate two plastic latches 90 degrees. This exposes the power supply, some rotary switches, and a 10 turn pot.This is the largest 10 turn pot I have ever seen. It makes a very satisfying sound when you turn it and seems to be in top notch condition.The input head comes off after you remove a single thumbscrew from the back of the device. Very easy.You can then remove the case from the input head with a single screw.Inside of the input head you can see a metal box with 5 leads coming out of it. That is a vacuum tube that is part of the amplifier for this device.Further, there are more rotary switches. The passives on these switches are wonderful - some of the resistors seem to be wire wound and then glass encapsulated? I've never seen anything like it.I also really like how they seem to have made adjustable capacitors by putting metal tubes over some of these glass resistors. and sliding them around. Very fun.Here is a close up of the beefiest looking rotary switch. Looks like all gold. Beautiful.Anyways - that's all for now. The device seems to be 100% operational which is pretty impressive considering its age. I will probably part with it on Ebay eventually since it's a bit large - but it sure is sexy.

author: daqq
author_rank: Super Contributor
timestamp: November 07, 2014, 12:45:07 pm
content: Thanks for the teardown! Really nice to see this kind of stuff!
New Keithley SMU 2460 - High Current - Page 1
Forum section: electronics / testgear

author: es
author_rank: Contributor
timestamp: November 07, 2014, 08:34:38 am
content: Just noticed that Keithley released a new SMU, big brother to the 2450:http://www.keithley.com/news/prod110514Looking at the specs vs the 2450:+ 105V 7A 100W- No triaxial connectors- Missing the lower voltage range- Missing the two lower current ranges- About $2000 more

author: HighVoltage
author_rank: Super Contributor
timestamp: November 07, 2014, 08:40:11 am
content: I find it interesting, that Keithley is not matching the 10A of the Agilent SMU.
Help: book explaining the funktion and use of an oscilloscope? - Page 1
Forum section: electronics / testgear

author: aat24
author_rank: Contributor
timestamp: November 06, 2014, 11:01:37 am
content: I' m looking for a book explaining the funktion and use of an oscilloscope. Any ideas or suggestions? Do you know good websites about scopes?

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: November 06, 2014, 11:30:04 am
content: Quote from: aat24 on November 06, 2014, 11:01:37 amA good starting point is this:Handbook of Oscilloscope TechnologyIt covers the traditional analog scopes as well as digital scopes, although the focus is on the analog scope. However, you should find the fundamentals there.LeCroy has also published some guide which, although dealing with their own products of the time, should give you some insight into how advanced digital scopes are working:LeCroy Color Digital Oscilloscopes Hands-On Guide

author: nfmax
author_rank: Super Contributor
timestamp: November 06, 2014, 02:24:15 pm
content: The classic, first go-to guide to the oscilloscope is Tektronix's famousXYZs of Oscilloscopes, availablehere. The current edition is addressed to digital oscilloscopes, but earlier editions covered analogue technology too. Indeed, that's all that was around when the book was originally written.

author: w2aew
author_rank: Super Contributor
timestamp: November 06, 2014, 04:11:37 pm
content: Quote from: aat24 on November 06, 2014, 11:01:37 amYou could always watch one of my "Basics do Oscilloscopes" videos on YouTube. See the sticky thread in the beginners forum here. Here is a link to a recording of a class I taught to a local radio club earlier this year.

author: MarkL
author_rank: Unknown
timestamp: November 06, 2014, 04:54:21 pm
content: Quote from: nfmax on November 06, 2014, 02:24:15 pmI've read earlier versions of this document. Still very useful, but it looks like it's been through the marketing filter a few times on this last revision.

author: David Hess
author_rank: Super Contributor
timestamp: November 06, 2014, 10:41:25 pm
content: Quote from: MarkL on November 06, 2014, 04:54:21 pmThat is the case with a lot of their publications. They have an annoying tendency to keep the same name without distinguishing different editions which makes finding the old ones difficult.
Does anyone own a Tenma 72-10495 bench supply? - Page 1
Forum section: electronics / testgear

author: voltz
author_rank: Frequent Contributor
timestamp: November 05, 2014, 11:08:21 pm
content: Hi, I'm new here.I am looking at buying a Tenma 72-10495 dual bench power supply and was wondering of anyone has one already. What i need to know is, does it have a tracking mode so one voltage control can set the output voltage of both supplies at the same time (voltage tracking).It does seem to have Parallel and Series modes (i am unclear what these do) but how exactly do these mode work and will it give me tracking as i just described.Thanks in advance.

author: Pinkus
author_rank: Frequent Contributor
timestamp: November 06, 2014, 10:09:31 pm
content: These are rebadged Korad power supplies.Try looking forKoradPSUs, they are much cheaper but identical but the printed name on the front.If you are in parallel mode, one control will set the voltage of both PSUs, so both will be identical automatically. Without beeing in parallel mode, you will have to set the voltage of each separately.I am not sure right now about the serial mode - i will need to try out first.

author: voltz
author_rank: Frequent Contributor
timestamp: November 06, 2014, 10:25:52 pm
content: Thanks for that. That is what I was hoping for, Parallel mode (voltage tracked) sounds correct.Sad to say the manual for this PSU has no information about these modes, not that I could find.I will look up Korad PSUs too.
Fluke WTH ????  - Page 1
Forum section: electronics / testgear

author: DavidDLC
author_rank: Frequent Contributor
timestamp: November 06, 2014, 03:40:20 am
content: What the heck Fluke, I'm pissed offI sent the unit for warranty repair on the leaking super cap and low sound buzzer. Both problems fixed, but now on my second use after receiving back the tilt bail got broken, I didn't apply too much force, several years with the unit and no problem, I take good care of my equipment...aghhhhI'm pissed off because I don't know if they are going to send me a replace or what ? I will see tomorrow when I call them.I was really happy when I received the unit and checked that both of the problems were fixed and now this....Do you think they will give me a replacement ?David.

author: ivaylo
author_rank: Frequent Contributor
timestamp: November 06, 2014, 07:31:35 am
content: Tell them they replaced it and the new one they put was cracked, this is probably what happened. They replaced the back of mine too, no prob. so far...
PicoScope promotions - Page 1
Forum section: electronics / testgear

author: gmit77
author_rank: Regular Contributor
timestamp: November 05, 2014, 08:35:56 pm
content: Hello Everybody! getting closer to Xmas, we are activating many discounts on products.We just uploaded the Pico Technology full product line and some of the best seller have already a disocunt.Would you like a discount on a product not discounted? Just ask in PMHere is the selection we made to find the right USB scope with easy:http://www.batterfly.com/shop/pc-oscilloscopes
Rigol 1054Z - Page 1
Forum section: electronics / testgear

author: avvidclif
author_rank: Regular Contributor
timestamp: November 04, 2014, 05:54:06 pm
content: Trying again. No message last time.Could someone PM me the instructions to upgrade the scope and the EEV Blog discount code? TIA

author: Fungus
author_rank: Super Contributor
timestamp: November 04, 2014, 07:42:58 pm
content: Quote from: avvidclif on November 04, 2014, 05:54:06 pma) You know the scope can be modifiedb) You don't know howThose statements are mutually exclusive, does not compute.Maybe that's why you didn't get a reply.

author: caall99
author_rank: Regular Contributor
timestamp: November 04, 2014, 09:32:19 pm
content: Yeah i read his first post... and i didn't feel like replying.Here is a good hint: RigLOL

author: avvidclif
author_rank: Regular Contributor
timestamp: November 04, 2014, 09:41:32 pm
content: What doesn't compute? I know it can be modified as documented on this forum. What I don't understand is the procedure. I looked at riglol and the math was way over my head.May you never need help repairing a ham radio, I won't reply.

author: caall99
author_rank: Regular Contributor
timestamp: November 04, 2014, 09:45:42 pm
content: Don't threaten, brah...http://lmgtfy.com/?q=riglolthen goto first link, read some numbers off your unit, use your keyboard skillz, profit...where is the math involvement?

author: avvidclif
author_rank: Regular Contributor
timestamp: November 04, 2014, 09:55:34 pm
content: I found a video..... Thanks to those who helped.
20 channel, 100GHz real time oscilloscope (this is not a joke) - Page 1
Forum section: electronics / testgear

author: jeremy
author_rank: Super Contributor
timestamp: November 03, 2014, 09:44:13 pm
content: better start saving your pocket money:http://teledynelecroy.com/100ghz/

author: TriodeTiger
author_rank: Regular Contributor
timestamp: November 03, 2014, 09:58:33 pm
content: Heard about this before on the Amp Hour, or maybe it was something similar like a rack mount thing meant for military use only pretty much. This one looks like quite a compact package though!

author: Marco
author_rank: Super Contributor
timestamp: November 03, 2014, 09:59:42 pm
content: 20 channels by re-using a single control module ... but with a stack of capture modules.Sell a scope for millions, can't pay someone to proofread the datasheet :Quote

author: nctnico
author_rank: Super Contributor
timestamp: November 03, 2014, 10:06:38 pm
content: IIRC Free-electron posted some pictures of this oscilloscope earlier. Perhaps he even spotted it in the wild.

author: German_EE
author_rank: Super Contributor
timestamp: November 03, 2014, 10:14:19 pm
content: It has been reported elsewhere that scientists have now made an amplifier that can give 11dB gain at 1 THz, Teledyne LeCroy have some catching up to do.

author: jeremy
author_rank: Super Contributor
timestamp: November 03, 2014, 10:39:46 pm
content: Quote from: nctnico on November 03, 2014, 10:06:38 pmThis was announced on the 29th, was it after then?

author: nctnico
author_rank: Super Contributor
timestamp: November 04, 2014, 12:11:51 am
content: Before but perhaps Lecroy beefed up an existing model.

author: daqq
author_rank: Super Contributor
timestamp: November 04, 2014, 09:13:41 am
content: Wow... what kind of ADCs go into a thing like that? I'd love to see a teardown. Or atleast a price tag.

author: DanielS
author_rank: Frequent Contributor
timestamp: November 04, 2014, 02:47:00 pm
content: Quote from: daqq on November 04, 2014, 09:13:41 amThe only way to sample a 100GHz signal is to interleave a bunch of slower ADCs. How fast those ADCs are simply changes how many sample-and-hold buffers will be required.The real question should be: what sort of sample-and-hold circuitry goes into a thing like that? That's the really tricky part.As for the price tag, Lecroy's 60GHz scope starts around 500k$ so I would expect a 100GHz equivalent to be in the 750-1000k$ range.

author: Lukas
author_rank: Frequent Contributor
timestamp: November 04, 2014, 06:50:49 pm
content: Quote from: DanielS on November 04, 2014, 02:47:00 pmThis only gets you to around 30GHz of bandwidth. All scopes with much higher bandwidth use frequency interleaving. The 30...60GHz band gets downconverted to DC...30GHz and digitized. The low band gets digitized directly. Lecroy calls this technology 'DBI'. I'm wondering whether they somehow managed to to s&h at 50GHz bandwidth or if they employ three paths of downconversion. (DC...33GHz, 33...66GHz, 66GHz...100GHz)
Waveform speed - does anyone use a small frequency counter? - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: November 04, 2014, 02:49:18 am
content: Hi,I've seen a lot of posts where people hookup a second scope or frequency counter to the trigger out on their scope to see the waveform speed. Has anyone found a small cheap counter that you could just leave plugged in? Why they don't just show this on the display I don't know. It seems one could easily make a small one that you could plug into the scope USB for power...Do you need to know the wfm/s when using it? Probably not, but it might be nice to know...Thanks,Alan

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: November 04, 2014, 03:17:56 am
content: http://www.ebay.com/itm/1-MHz-1-1-GHz-Frequency-Counter-Tester-Measurement-For-Ham-Radio-/121421950093?pt=US_Radio_Comm_Meters&hash=item1c454fec8dLooks OK but how you get 1GHz through a MTA-100??? Maybe those h.fl connectors?

author: alank2
author_rank: Super Contributor
timestamp: November 04, 2014, 03:21:08 am
content: I saw some of those, but this would need to be 1 Hz to 200 kHz (to 1 mHz)...

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: November 04, 2014, 03:28:58 am
content: Quote from: alank2 on November 04, 2014, 03:21:08 amAh, well that's another thing. No idea.

author: Vgkid
author_rank: Super Contributor
timestamp: November 04, 2014, 04:15:30 am
content: This is pricey, but it is rather interestinghttp://www.ebay.com/itm/eMetrPlus-SFM-112A-Frequency-Counter-0-8999999Hz-to-2-4GHz-Portable-Bench-/161207991532?pt=LH_DefaultDomain_0&hash=item2588bebcec

author: kwass
author_rank: Frequent Contributor
timestamp: November 04, 2014, 04:18:35 am
content: Quote from: Alex Eisenhut on November 04, 2014, 03:28:58 amMaybe this one:http://www.ebay.com/itm/60-MHz-FREQUENCY-COUNTER-1Hz-RESOLUTION-Temperature-Voltage-Meter-UART-USB-/120971048751?pt=US_Radio_Comm_Meters&hash=item1c2a6fb72f

author: alank2
author_rank: Super Contributor
timestamp: November 04, 2014, 01:12:16 pm
content: Maybe I should make one as a for fun project. I am thinking of something tiny that could be put next to or even perhaps under a scope. Maybe a 0.36" LED or even a bubble display like this:https://www.sparkfun.com/products/12710
Some cheap i2c/spi/serial sniffer? - Page 1
Forum section: electronics / testgear

author: ehsmeng
author_rank: Contributor
timestamp: November 03, 2014, 07:42:44 am
content: Hi,I'm curious if there are any cheap logic analyzers that are usable out there that you could recommend?It must be able to trace i2c, spi and normal serial. Other formats is a strong bonus.Should be cheap.Software gets bonus points if it does Mac.It it was just for me I'd likely get a Saleae, but if I'm working on some project with ppl spread out over various locations, it would be nice if everyone could have a cheap thing to just get by. In this context, one Saleae would be 5-10 ones from ebay or ali.Having burn marks from crap purchases from ali/ebay, I wonder if there's a specific gizmo anyone could recommend.Thanks!Marcus

author: godFather89
author_rank: Contributor
timestamp: November 03, 2014, 09:04:05 am
content: Bus Pirate, Open Logic Sniffer.
Keithley 173A Electronic Flea Market find - Page 1
Forum section: electronics / testgear

author: calexanian
author_rank: Super Contributor
timestamp: November 10, 2014, 12:25:37 am
content: While cleaning up my stand at a recent TRW electronic swap meet I saw a very lonely looking Keithley 173A sitting in front of a bunch of 70's boat anchor unrecognizable production equipment. I had to give it a home. The guy wanted $20 for it, so I figured its worth a gamble. Fix it it, put it back in my stand next time for $35, and somebody gets a cool old meter for cheap. Plug it in and clearly something is not right. Little bit of flickering and thats about it.Thou Shalt Check Voltages..... No biggie. Fried 7815 regulator. Don't have any, so I stick a 7812 just to get it powered up and make sure its running. No problems there. So its nagging at me. What made that regulator go bad in an otherwise normal appearing meter. I think Keithley played a little fast and loose with their supply voltages. I measured up to 38 volts +/- depending of line voltage (125 volts, max our power company says they can give you, normally I have spot on 120 here. but I run a variac up on everything now to test. I had a recent experience that now makes me include an over voltage test on everything I do) and as memory serves me that borderline in shutdown for a standard 78XX series. I recall one of our designs having issues with borderline high voltage on a 7805 and depending on manufacturer, or country of origin we had wild sporadic issues. I would think a test gear company would have been a bit more "In the numbers" lets say.BTW it runs with the 7812, but all of the voltage measurements are way out of zero, etc etc, ordering a proper part Monday, but I know its otherwise fine. Interestingly it measures resistance bang on. Bust be a separate circuit or reference or something.
FLUKE 123 - does not power up sometimes... - Page 1
Forum section: electronics / testgear

author: Analogdevice
author_rank: Contributor
timestamp: November 02, 2014, 09:44:42 pm
content: Hello everybody.Can you help me with this machine? Problem is, that the machine does not power up. If I push the on button, buzzer reproduces very weak beeps. These beeps are as weak, that you can´t hear it, if you have a closed case. It looks like the machine wants to power up, but something say "NO", so this is repeating again and again. If I pressed the up and right arrows and ON button, I hear a weak beep (once), so it means, that MASK software is running.There are some detections:1. I think that the machine does not power up in cold or hot temperature. Yesterday there were 21°C in my room and the scopemeter ran without any problems. Today I gave the scopemeter outside for some time (outside were 9°C) and then the machine doesn´t ran for some time. I found "LCDTEMP" in schematic of fluke and what so you think? May be the problem there?2. If I push the ON button, D471 must recieve log1 to N501 - pin 62. This signal called POWONOFF and it can be measured on test point TP528. This signal is there, when the machine is opperationally, but when doesn´t power up, there is log0 and some pulses (see picture in the add.).What do you think about it? Is there anybody, who knows to tell me, where I must find the problem?Thank you very much.

author: Analogdevice
author_rank: Contributor
timestamp: November 02, 2014, 10:20:27 pm
content: I almost forgot... When the machine are functionally, all circuits works correct, all functions performs. I measured slow ADC, charger circuit, flyback converter and it runs perfect. When the machine are not operational (I think when the buzzer beeps), the MASK software runs, because the charger circuit works and charged the batterry.Second thing... When the machine was some time power ON, then I can power up it without any problems, so I think, that there is some problem with temperature.Battery pack is OK, I have a new Ni-Cd cells on it.
Rigol Trigger Out/Pass/Fail connector. - Page 1
Forum section: electronics / testgear

author: Rene
author_rank: Regular Contributor
timestamp: November 02, 2014, 08:23:19 pm
content: Hello,I noticed that my Rigol oscilloscope has a BNC connector on the back that is labeled "Trigger Out/Pass/Fail". Just for fun, I wanted to take the signal coming out that connector and plug it into the oscilloscope channel 1 input.The problem is that I am afraid of taking a BNC cable and directly connecting the two connectors because I don't know if this will hurt the oscilloscope in some way.Is it safe to just connect the two connectors together via a straight BNC cable or do I need something a little bit more fancy to make that happen?Thanks.

author: alex.forencich
author_rank: Frequent Contributor
timestamp: November 02, 2014, 08:57:41 pm
content: If you hooking something up to a scope input channel, there is nothing to worry about. They break it out as a BNC for convenience so you can do exactly that. You can also generally run it to the trigger input on the back of a scope, though this can be slightly more fiddly than coming in through a channel input (generally you can only do edge triggering with a fixed threshold). Generally those outputs are just 0 or 5v, so nothing really to worry about. And it should be protected against shorts internally with a series resistor.

author: Rene
author_rank: Regular Contributor
timestamp: November 02, 2014, 09:30:31 pm
content: Thanks Alex.For a second I thought I would have to buy one of those crazy BNC cables with terminators on them so they pretend to be some sort of oscilloscope prove.By the way, is there a particular BNC spec cable I should get? I keep reading a lot about 50 / 75 ohms and other interesting specifications.Thanks.
Rigol Oscilloscope Sample Rate Optimization Awkwardness - Page 1
Forum section: electronics / testgear

author: Rene
author_rank: Regular Contributor
timestamp: November 02, 2014, 04:13:28 am
content: HI guys,I have been playing around with my new Rigol oscilloscope and I recently came across a behavior that seems awkwards to me. Specifically, the awkwardness revolves around the sample rate the oscilloscope is choosing. To get my point across, please take a minute to check out the attached screenshot.If you look at that screenshot, you will notice that the memory depth selection is equal to 12M (12000000 samples) and that the horizontal time resolution per division is 50ms (.05 seconds) for a total window horizontal time resolution of 0.6 seconds (0.05 X 12 = 0.6).Now, if I take the 12000000 samples (memory depth) and divide that number by 0.6 seconds (total time being viewed), I should end up with the samples per seconds (sample rate) that the oscilloscope should capture for that range of time: 12000000 / 0.6 = 20000000 Sa/s (20M Sa/s).Assuming that my math is correct, why is the oscilloscope choosing a sample rate of 10M Sa/s as seen on the screenshot? It looks like rather than choosing a maximum sample rate of 20M Sa/s is choosing a 10M Sa/s and doubling the amount of time being capture from 0.6 seconds to 1.2 seconds.Why would the oscilloscope do that? Why is it not maximizing the sample rate for my chosen time range?Thanks.

author: Howardlong
author_rank: Super Contributor
timestamp: November 02, 2014, 05:57:03 am
content: I have noticed this too.My assumption is that they had a limited amount of room in the FPGA and so had to hard code a number of depth and sample rate combinations to suit their algorithmic and space constraints.The sample rates seem to go up in a 1-2-5 increment until you get beyond 10MSa/s, where it appears there is more correlation to making the scheme fit perhaps some internal counter/divider scheme.100kSa/s200kSa/s500kSa/s1MSa/s2MSa/s5MSa/s10MSa/s25MSa/s50MSa/s125MSa/s250MSa/s500MSa/s1GSa/s

author: rf-loop
author_rank: Super Contributor
timestamp: November 02, 2014, 06:32:41 am
content: Quote from: Rene on November 02, 2014, 04:13:28 amTFT visible area is 12 div but captured lenght is more. Stop and zoom out you know real sampling lenght. (I do not have this Rigol so I do not know exactly this number of divs.) This is quite common practice with many scopes.
Type of fuse for UT61C - Page 1
Forum section: electronics / testgear

author: larsdenmark
author_rank: Regular Contributor
timestamp: November 03, 2014, 12:17:36 pm
content: I need a new 1A fuse for my UT61C multimeter (please don't ask whyThe size is 6.3 x 32 mm, but I can choose between Time Lag, Fast and Super Fast. Which is the right kind?Thanks!

author: Wytnucls
author_rank: Super Contributor
timestamp: November 03, 2014, 01:13:38 pm
content: FF or super fast.

author: SeanB
author_rank: Super Contributor
timestamp: November 03, 2014, 05:31:45 pm
content: Buy a pack of 5, and toss in a pack of 5 of the other fuse as well. That way the shipping is spread over a number of devices, and just in case you pop another by accident you will have spares.A lot of the low cost meters I use will have a pack of 5 spare fuses stuck inside the case for those instances, just in case I need them after a non thought of operation mode moment.

author: larsdenmark
author_rank: Regular Contributor
timestamp: November 05, 2014, 02:13:30 pm
content: Thanks! I'll order a pack right away.
Tektronix 2246 - Page 1
Forum section: electronics / testgear

author: viperrepair
author_rank: Newbie
timestamp: November 01, 2014, 08:01:13 pm
content: Hello everyone. First Id like to say how impressed I was when cs.dk posted for help with his scope: EEVblog Electronics Community Forum » Electronics » Test Equipment » Tektronix 2246 - No beam!I also received a 2246 with no beam and seemed like it would never get one till I found this thread and found that my diode was broken as well!! Big thumbs up to all the people who contributed to his (now our) success!Alas, although I now have a trace the machine fails the 5us time test and consequently the trigger wont trigger this is the only thing the scope would do when it had no beam. I thought the diode would repair everything but the problem still exists.Sooo I was hoping you guys and girls could put your big fat brains together and help me diagnose this problem. Any takers??