hybridfree/eevblog-posts huggingface dataset:
Multiplying scopes - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: May 20, 2018, 11:26:42 pm
content: I'm sure my o'scopes are running funny games before I go to bed. 2 days ago, there were two of them. Yesterday, there were four of them. Nothing happened today. I'm kind of excited to know how many I'll have tomorrow. Do these things multiply at night?

author: tautech
author_rank: Super Contributor
timestamp: May 20, 2018, 11:29:17 pm
content: We have this place reserved for you:https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/

author: hendorog
author_rank: Super Contributor
timestamp: May 20, 2018, 11:33:15 pm
content: Quote from: tkamiya on May 20, 2018, 11:26:42 pmBetter play it safe and pop a rubber cap on the ports...

author: particleman
author_rank: Regular Contributor
timestamp: May 21, 2018, 01:02:51 am
content: Collecting them is easy. Keeping them running is where it gets a little more difficult

author: Electro Detective
author_rank: Super Contributor
timestamp: May 21, 2018, 01:24:56 am
content: Shut down your computer browser before hitting the sackand or delete any rogue Ebay/PayPal Bookmarksit works for a while

author: Brumby
author_rank: Unknown
timestamp: May 21, 2018, 07:36:45 am
content: Quote from: tautech on May 20, 2018, 11:29:17 pmThis ^ ^ ^ ^

author: BravoV
author_rank: Super Contributor
timestamp: May 21, 2018, 07:40:09 am
content: Quote from: tkamiya on May 20, 2018, 11:26:42 pmOvernight ? Naah .. soon you will get used to, that it will happen may be in hours.
buy function generator - Page 1
Forum section: electronics / testgear

author: Adrian_Arg.
author_rank: Frequent Contributor
timestamp: May 19, 2018, 10:04:55 pm
content: hello, I want to make a consultation, precise advice for the purchase of a generator of functions, which is not very expensive, I'm sure I will use it very little, but my son sure if because he is in third year of electronic engineering and had to return to lose one for a job of the faculty.discard FY6600, I already bought some for a while ago stopped working at 45 days, and never received any news from feeltech, we get tired of emails, with images of the problem.He was watching these companies.Rigol, poruq we have the oscilloscope ds1054zSiglent, Uni-t, Owon, does not need to be more than 20 mHz, and the problem with the second hand is that most do not send to Argentina, and for example equipment cost u $ s140 + send u $ s 150, then combine Go for a new one. Agradesco your comments.in spanishhola, quiero hacer una consulta, preciso asesoramiento para la compra de un generador de funciones, que no sea muy caro, yo seguro lo voy a utilizar muy poco, pero mi hijo seguro si porque esta en tercer año de ingenieria electronica y tuvo que volver a perdir prestado uno pra un trabajo de la facultad.descarten FY6600, ya le compre unos hace un tiempo dejo de funcionar a los 45 dias, y nunca recibi ninguna noticia de feeltech, nos cansamos de manderles mail, con imagenes del problema.el estuvo viendo estas companias.Rigol, poruq tenemos el osciloscopio ds1054zSiglent, Uni-t, Owon, no precisa ser de mas 20 mHz, y el problema con los segunda mano es que la mayoria no envian a la Argentina, y por ejemplo costo equipo u$s140 + envio u$s 150, entonces combiene ir por una nuevo. Agradesco sus comentarios.
* Fluke 96 Series II * - Page 1
Forum section: electronics / testgear

author: mrrstrat
author_rank: Newbie
timestamp: April 11, 2018, 12:05:16 pm
content: I just bought a Fluke 96 of the 'bay.I cannot find anything on that model but loads of stuff on the 96B and 97.What is the deal with these - is it a good portable 50Mhz scope?Paid $250 with probes, original carry case, manuals, and near mint condition.

author: joeqsmith
author_rank: Super Contributor
timestamp: April 11, 2018, 12:19:55 pm
content: First hit on Google.http://assets.fluke.com/manuals/scopemt2umeng0000.pdf

author: mrrstrat
author_rank: Newbie
timestamp: April 11, 2018, 12:43:15 pm
content: I can find manuals and even a couple of videos, but nobody telling me how good or how bad it is. The 97 has lots of information from people and even the 96B. Mine is the older one.I am looking to use it as opposed to dragging my Tektronix bench scope out on the shop floor and instrument lab.

author: maginnovision
author_rank: Super Contributor
timestamp: April 11, 2018, 04:02:42 pm
content: They're tough and mostly reliable, minus the bnc inputs and sometimes the screens. I'd definitely recommend a Micsig or newer fluke handheld but if it's what you can afford it should be fine.

author: mrrstrat
author_rank: Newbie
timestamp: April 13, 2018, 02:30:42 am
content: Just got it - can't believe it. It is in perfect and unused condition with ALL of the original swag. The manual appears to have never been read and original clamshell case has all of the new Fluke stuff in it.Curiously the battery pack is not included and the power cord was repaired. Other than that it looks like the original owner treated it like a very expensive heirloom.I'll take it to work tomorrow and put it to use :-)

author: mrrstrat
author_rank: Newbie
timestamp: May 19, 2018, 10:02:26 pm
content: Has anyone been able to get data from the Fluke 96 series: such as data points, voltages,..I am looking for a way to get to the data in my old but nice Fluke 96. I can write programs or build hardware to talk to it but if someone has already done this I am interested in knowing how to do it.

author: mrrstrat
author_rank: Newbie
timestamp: May 19, 2018, 10:04:36 pm
content: I know abouthttp://scopegrab32.sourceforge.net- has anyone used this?
Tek AFG3000 series LCD - Page 1
Forum section: electronics / testgear

author: Omicron
author_rank: Regular Contributor
timestamp: May 19, 2018, 01:22:42 pm
content: The original Tek AFG3000 series of function generators have a pretty lousy LCD screen in them. It's a shame really because these are pretty nice function generators. I was wondering if anyone had any experience replacing the screen with something better? Or alternatively a good source for drop in replacement LCD screens?Edit: I've learned that the LCD is a Kyocera KCS057QV1AJ-G39 and I've ordered one from eBay. Same crappy screen as currently in there but hopefully at least with a backlight that is still good. We'll see how it goes.Does anyone have any tips for fixing the rubber membrane keypad that is starting to go bad? A good clean of the pads with alcohol?
Tek AM503A  current proble amplifier:  Battery? - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: May 18, 2018, 02:00:44 am
content: I recently purchased (has not arrived yet) a Tek AM503A current probe amplifier (supposedly in working order).I should probably replace the battery assuming the calibration relies on the battery backed RAM, the instruction manual describes physically how to change the battery, however I'm concerned the calibration will be lost of if I don't provide an alternate supply while the battery is out. Does anyone have any insight on this?There are vague instructions about running diagnostic 97 and 99 that supposedly erase the previous data and then restore it, not sure if this is calibration data or just the last settings when powering down?

author: georges80
author_rank: Frequent Contributor
timestamp: May 18, 2018, 04:46:48 am
content: Seems pretty clear that the nvram stores front panel settings; and calibration data that is determined after the degauss operation.I see no risk of removing/replacing the battery and losing data in the nvram. Just follow the the instructions and perform the routine 97 and then routine 99 steps. This will get the nvram back into a functional state.cheers,george.
Philips PM3370 with integrated PM3372 Dual trace Y amplifier - Page 1
Forum section: electronics / testgear

author: Cicada
author_rank: Regular Contributor
timestamp: May 23, 2018, 06:06:02 pm
content: HiI would like to ask in your experience what are these old clunkers good for i.e. what type of work and are there things that they are better at than today's lower end digital oscilloscopes?I can possibly get one for very cheap. Will check if it is working though before I spend a penny. No time to fix. I do have place for it on my work bench. The 150Mhz sure beat what I have now.Thankshttps://www.allaboutcircuits.com/test-measurement/oscilloscopes/pm-3000-series-3370/http://www.philipsradios.nl/Schemas/overig/Philips%20PM3370%20handleiding.pdf
Thats a big book (DMM7510 manual) - Page 1
Forum section: electronics / testgear

author: kj7e
author_rank: Frequent Contributor
timestamp: February 08, 2018, 03:25:53 am
content: Sent Staples the reference manual PDF to print, 1032 pages. Double sided and hole punched came to $75. I really like paper manuals and found the answer to more than one question I had only in the reference manual.

author: SkyMaster
author_rank: Frequent Contributor
timestamp: February 10, 2018, 12:01:00 am
content: You are not alone.I like paper manuals as well.

author: niner_007
author_rank: Frequent Contributor
timestamp: May 19, 2018, 06:50:29 am
content: got mine too

author: Specmaster
author_rank: Super Contributor
timestamp: May 19, 2018, 09:33:58 am
content: Paper manuals are sop much easier to read and of course can be read almost anywhere as well, so thats another advantage, plus of course you can have the manual open and work your way through some complicated steps much easier by flicking pages back and forth then you can by scrolling on screen while trying to use the meter.

author: tggzzz
author_rank: Super Contributor
timestamp: May 19, 2018, 09:48:37 am
content: ... but searching for a phrase is more drawn out

author: Specmaster
author_rank: Super Contributor
timestamp: May 19, 2018, 12:31:39 pm
content: Quote from: tggzzz on May 19, 2018, 09:48:37 amTrue but you can search on the computer or whatever and then turn to the page in the book.From mobile device so predictive text might have struck again
Megger BM204 - Page 1
Forum section: electronics / testgear

author: MosherIV
author_rank: Super Contributor
timestamp: May 18, 2018, 08:21:35 pm
content: HiJust ebayed thisWas sold as spares or repair. Sadly it is DOA. Nothing on screen on any switch setting. There was signs of battery leak on the spring of the battery compartment. No obvious signs of damage to tracks or components.Here is the insidesAnd the front sideNot had a chance to power it with bench psu yet to sett if there are signs of life.

author: Gregg
author_rank: Super Contributor
timestamp: May 19, 2018, 02:51:42 am
content: I have one of those, but unfortunately it is at my cabin far away. However I remember having to clean the zebra connector to the display. Hope this helps.

author: Shock
author_rank: Super Contributor
timestamp: May 19, 2018, 06:46:53 am
content: Sell the spare fuse and throw it in the bin, profit.Edit: don't forget to current limit in case it blows the fuses.
Tektronix TDS5xx/6xx/7xx color CRT cross-compatibility  - Page 1
Forum section: electronics / testgear

author: and.pas
author_rank: Newbie
timestamp: May 17, 2018, 12:14:50 pm
content: Hello,I have a TDS754D scope, working fine but the CRT is a little dim.I'm investigating about the possibility to swap the CRT with another from a donor scope.On the 754D the part number is 154-0968-24 (CRT + NuColor LCD shutter), while older models I know use 154-0968-00 or 154-0968-01.I wonder if these are cross-compatible and if it possible to fit an older CRT in my 754D.Anyone has some experience in reviving / rejuvenating these CRTs?ThanksAndrea

author: nctnico
author_rank: Super Contributor
timestamp: May 17, 2018, 12:36:57 pm
content: From my experience with these scopes they are exchangeable.
Why are freq ref inputs not always 50 ohm? - Page 1
Forum section: electronics / testgear

author: magnehh
author_rank: Contributor
timestamp: May 16, 2018, 04:21:25 pm
content: Hi all!My question is:Why are frequency reference inputs (e.g. 10MHz) not always 50 ohms?I've been wondering about this for ages, but have never found an answer. The only reasonable explanation I can come up with is to be able to daisy-chain devices, with a terminator at the last device in the chain.I just tested this with my beautiful, old Agilent 53131A, and it's not even close to 50 ohms. I did this by hooking a sig. gen. to a tee at the freq ref input of the 53131, then to a scope with another tee. I then tested with and without a 50 ohm terminator at the scope. Instead of halving, it only shrunk about 10% or so.Any help would be appreciated!

author: TheSteve
author_rank: Unknown
timestamp: May 16, 2018, 04:31:21 pm
content: I don't think your testing method will give very good results. Assuming you had the 50 ohm termination enabled on the counter and it isn't damaged it will be very close to 50 ohms. You can measure its resistance at DC with a multimeter which will give you a good idea if it is enabled properly and functioning. To really know its performance though you'd need something that can measure its return loss or SWR up to the rated input frequency. A network analyzer or a spectrum analyzer that can make scalar measurements using a tracking generator and a return loss bridge or directional coupler.

author: magnehh
author_rank: Contributor
timestamp: May 16, 2018, 04:51:55 pm
content: Thanks for your input, TheSteve. Correct me if I'm wrong, but I think you may be thinking about the counter inputs on the front, which are indeed selectable 1Mohm or 50 ohm. I'm wondering about the input on the back, which provides the reference clock (Ref in).Sometimes, these inputs are transformer coupled, hence my method of injecting a 10MHz signal to measure the loading.

author: Vgkid
author_rank: Super Contributor
timestamp: May 16, 2018, 05:10:30 pm
content: The input impedance on the 5335A is 1K , I have seen values usually around a couple hundred ohms(5-600) .

author: TheSteve
author_rank: Unknown
timestamp: May 16, 2018, 05:49:28 pm
content: Quote from: magnehh on May 16, 2018, 04:51:55 pmAhh, sorry, yes I was thinking of the front inputs. I don't think I've seen any 50 ohm ref inputs.

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: May 17, 2018, 01:19:44 am
content: Having higher impedance allows one to connect more devices to one 10 MHz source. Even though the proper thing to do is to use a 10 MHz distribution amplifier, in practice it usually works fine with several devices on one cable. If some standing waves develop due to impedance mismatch its not a big problem as far as the frequency is concerned.
Peakmeter autoranging issue - Page 1
Forum section: electronics / testgear

author: bevangg
author_rank: Newbie
timestamp: May 16, 2018, 07:13:02 pm
content: Just got a PM8247S, seems pretty solid but not sure how accurate it is. Also, trying to set current on drv8825 stepper driver it reads ohms not volts. It does not have a rotary switch so you have to rely on it's "smart" functionality. I had to get my old meter back out of the bin when I discovered this strangeness.Anybody else had this issue?

author: HKJ
author_rank: Super Contributor
timestamp: May 16, 2018, 07:41:12 pm
content: It needs some minimum values on current and voltage to work. I checked the MS8248S:https://lygte-info.dk/review/DMMPeakmeter%20MS8248S%20UK.html
HP5335A Universal Counter - How to input B ?  - Page 1
Forum section: electronics / testgear

author: AllTheGearNoIdea
author_rank: Unknown
timestamp: May 16, 2018, 11:27:48 am
content: https://www.keysight.com/en/pd-1000001399%3Aepsg%3Apro-pn-5335A/universal-counter-200-mhz?cc=GB&lc=engI have just finished repairing a HP5335, nothing worse than all the supply rails had failed. The unit has 3 inputs A B and option C fitted. Can someone tell me how to display the frequency for input B. I have read the manual and it mentions inputs A and C but not B. The B input does apper to be working and gating etc but there is no button to select B as the input. Has anyone a memory of using these.Looks like these units are quite poor by todays standards but I do like the nice big frequency display and I will probably run an external clock from my GPS disciplined standard. Anyone got a spare oven Osc option ?ThanksChris

author: Dr. Frank
author_rank: Super Contributor
timestamp: May 16, 2018, 11:53:36 am
content: FREQ B is a 'Special Function', No 17, either accessible by GPIB control via FN or FU command, or via front panel, described in paragraph 3-164 on page 3-21.Press: SCALE, SMOOTH, 1, 7, ENTERFREQ A is 200MHz, FREQ B is 100MHz only.The 5335A is a very versatile counter, with a bundle of functions.I really like it, with these many keys, and especially the numeric input, instead of these mediocre up/down keys on the successors, 53181/53131/53132A.And it performs nearly as well, with its 10811 OCXO it's very precise, only the T.I. resolution is 1ns instead of 100ps.So it displays 'real' 9 digits for 1sec gate time in frequency mode only, but that can be increased to 10 digits at 10s.. maybe to 11 digits at even longer Gate Time.The modern counters are of the time stamping type, and do a continuous averaging, claiming 12digits per sec, but that's a fake, as 100ps would yield 10 digits only. That also leads to problems with Allan ADEV statisticsFrank

author: AllTheGearNoIdea
author_rank: Unknown
timestamp: May 16, 2018, 12:34:08 pm
content: Wow Many thanks that is a great reply.Kind of strange they hid channel B via a special function menu ? A front panel buttun would have made more sense for me since they have buttons for A and CChris
Rigol DS2072A option unlock - Page 1
Forum section: electronics / testgear

author: mmaseda
author_rank: Contributor
timestamp: May 11, 2018, 08:15:40 pm
content: I know there are a lot of old post out there but can someone please direct me to the procedure for a DS2072A using firmware revision 00.03.05.03.03

author: Adrian_Arg.
author_rank: Frequent Contributor
timestamp: May 11, 2018, 08:20:28 pm
content: http://gotroot.ca/rigol/riglol/

author: mmaseda
author_rank: Contributor
timestamp: May 11, 2018, 08:28:19 pm
content: Already tried that but it didn’t work.

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: May 11, 2018, 09:10:19 pm
content: https://www.eevblog.com/forum/testgear/unlockinghacking-the-rigol-ds2000a-series-scope-the-short-post/This is the most recent procedure, it literally hasn't changed in years.

author: mmaseda
author_rank: Contributor
timestamp: May 11, 2018, 09:58:49 pm
content: When I run rigup against the dumpfile it says Failed, no keys. Using rigup for Windows 0.4.2

author: mmaseda
author_rank: Contributor
timestamp: May 11, 2018, 10:49:34 pm
content: Problem solved. Had to use rigup 0.4. Now have keys, Let’s see if they work !!

author: mmaseda
author_rank: Contributor
timestamp: May 11, 2018, 11:05:53 pm
content: WORKING !!!

author: Gazza2
author_rank: Contributor
timestamp: May 14, 2018, 07:59:11 am
content: How did you get it to work? I've been trying for quite a while to get the codes from my ds2072a with firmware 00.03.05.SP1 and hardware 2.3. I get the no keys message with rigup 0.4

author: mmaseda
author_rank: Contributor
timestamp: May 14, 2018, 02:58:20 pm
content: PM sent

author: Gazza2
author_rank: Contributor
timestamp: May 16, 2018, 03:15:23 am
content: Finally got mine to work! The missing piece of the puzzle was the correct scpi command :SYST:UTIL:READ? 1,33554432 to give a 32mb dump instead of the 1024kb ones I was getting, I found herehttp://www.anderswallin.net/2015/12/rigol-ds2072a-upgrade/I must have mistyped the command before because it wasn't working, so I copy/pasted it to get a successful dump.
Part ID on a Bruel & Kjaer conditioning amplifier 2690-0S2 - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: May 20, 2018, 03:02:00 pm
content: Does anyone recognize what connector this is on the power input? The manual states it's a TNC connector, but the picture in the manual does not match what's on the unit I'm working on. The attached picture is what's on mine.Thanks!

author: xmo
author_rank: Regular Contributor
timestamp: May 20, 2018, 03:30:56 pm
content: It looks like a Lemo connector.

author: Jwalling
author_rank: Unknown
timestamp: May 20, 2018, 06:33:30 pm
content: Quote from: xmo on May 20, 2018, 03:30:56 pmThanks, that's it! Boy, there's a billion different ones. I opened up the unit and was able to see a part # ERA.00 After spending some time on Mouser and looking at the datasheet, I think I found it's mate:https://www.mouser.com/ProductDetail/736-FFA00250CTAC27Not cheap...

author: xmo
author_rank: Regular Contributor
timestamp: May 20, 2018, 08:19:20 pm
content: I have one of the Nexus conditioning amplifiers. I was cheap and replaced the power connector with a round one I had on hand.Actually, I bought a couple of the Nexus units (used). I wanted one to use as a mic pre-amp for a test setup to measure and compare communications headsets. I did buy the Lemo connectors for the mic pre-amp inputs so I could make up the input cables. One cable from Brüel & Kjær would cost as much as I paid for the unit. Installing those Lemo connectors will test your soldering and mechanical skillsI did learn a few things. You can't just mix & match parts from a couple of broken ones to make one good unit. They do warn you in the brochure: "To reduce the cost of the instrument and to ensure accuracy and reliability, modules must be replaced at Brüel & Kjær."

author: b_force
author_rank: Super Contributor
timestamp: May 20, 2018, 09:10:07 pm
content: I think Brüel & Kjær is almost known of using awkward connectors.I used to work with acceleration meters.The pre-amplifiers had such weird COAX connectors
Upgrading an HP 53131A into 53132A - Page 1
Forum section: electronics / testgear

author: wholder
author_rank: Regular Contributor
timestamp: May 15, 2018, 10:43:10 pm
content: I was looking over the schematics for the HP/Agilent 53131A and 53132A frequency counters and noticed that the component differences between these two models is very small. I could have this wrong but both units seem to use use exactly the same front panel (same HP part number) and both seem to use the same PCB for the main board (but missing a few parts on the 53131A.) Aside from a handful of passive parts, the main differences seem to be:Additions for 53132A:U60 and U61 are both AD7580JP (10 bit A/D)U59 is a XC3042A-7PC84C (FPGA)U5 is a MC1403D_GChanges from 53131A to 53132AU58 is changed from a XC3042A-7PC84C to a XC3142A-4PC84CU12 & U13 are changed from CY62256NLL-70SNXC to faster CY7C199CN-15VXC parts (256K bit SRAM)There also the issue of the U14, which is a 64K-BIT EEPROM on both boards. This might contain different code on the 53132A but, curiously, both are listed with the same HP part number, 1818-5128.I realize this may be a fools errand, as most of these parts are very hard to very find, but I wonder if anyone has ever contemplated upgrading an 53131A into a 53132A?The FPGAs are almost certainly the most challenging part, as I doubt one can readout the code from one that's programmed. But, perhaps parts salvaged from a defunct 53132A might make this possible.Update: It appears the FPGAs are confirmed by the onboard MC68331CEH16 processor, so that makes things easier.Anyone else ever thought about, or tried this?WayneWayne

author: TheSteve
author_rank: Unknown
timestamp: May 15, 2018, 11:37:48 pm
content: Should be possible. It has been discussed before here - in a repair thread I do believe. You will need the missing parts, new firmware and a calibration.
DYNA ST-70 Harmonic Distortion Testing using all 1960's Heathkit Tube Technology - Page 1
Forum section: electronics / testgear

author: jcrubin
author_rank: Frequent Contributor
timestamp: May 14, 2018, 12:18:01 pm
content: In this video I demonstrate harmonic distortion testing of my Dynaco ST 70 amplifier using all Heathkit tube gear from the 50's and 60's. This demonstration shows the THD produced from this amplifier at 2KHZ using three different power inputs.The equipment used includes:Heathkit IG-72 Audio GeneratorDynakit ST70 Power AmplifierHeathkit IM-12 Harmonic Distortion MeterHeathkit O-12 OscilloscopeThe entire process is shown in the video over several iterations, some have been shortened
Older PACE SX-65A Sodr-X-Tractor need heater - use type in SX-70? - Page 1
Forum section: electronics / testgear

author: ce_lab
author_rank: Newbie
timestamp: May 09, 2018, 08:49:27 pm
content: I have the PACE MBT-250 but from some time ago with SX-65A hand piece. Does anyone know if the SX-70 heater will work in the SX-65A? They look the same. 5-lead, 3 hole mount, same tube attachment... The SX-65A has been discontinued and the heater is no longer available for it. Pace and Jensen could not answer the question. Thanks!

author: zitt
author_rank: Regular Contributor
timestamp: May 10, 2018, 10:55:50 pm
content: Is there a part number printed on the SX-65A heater?

author: ce_lab
author_rank: Newbie
timestamp: May 11, 2018, 01:11:30 pm
content: Nothing printed on it, just a mfg date. But I know it's p/n 6010-0074-P1 and the SX-70 is 6010-0060-P1.

author: factory
author_rank: Super Contributor
timestamp: May 11, 2018, 05:09:04 pm
content: The SX65A heater uses the older micro size tips (1/8" diameter) and the SX70 heater uses the 3/16" tips;http://docs-europe.electrocomponents.com/webdocs/001c/0900766b8001c460.pdfA discussion on another forum seems to suggest the SX65A heater was only available for a short time to allow people to use up stocks of older tips without needing the adaptor tip (ADAPTIP);http://audiokarma.org/forums/index.php?threads/pace-sx-70-desoldering-unit-puzzlement.792791/David
Owon SDS7102E LAN problems - Page 1
Forum section: electronics / testgear

author: JohnCC
author_rank: Newbie
timestamp: May 12, 2018, 05:32:48 am
content: Hi all. I bought an Owon SDS7102E a few weeks ago, and I'm quite satisfied with the hardware. The firmware is something else though. At the moment, the main issue I have is talking to the scope over Ethernet.The PC interface manual really only describes USB. The LAN is only mentioned in the line 'that's the same as USB'. The main issue seems to be that there is no real handshake protocol. Which seems to result is quite a few headaches if the commands are sent too fast. I can execute about 85% of the commands in the SCPI manual, but I have to be *very* careful not to send the commands too fast. Also, I have to take care that the commands don't accumulate in the OS buffer - and concatenate. This is perfectly legal in TCP, but confuses the 'scope no end. I've tried adding ';' command separators, as per the SCPI standard, but the scope doesn't like the semicolons at all. The firmware even crashed a couple of times, disabling everything.Does anyone have any experience using the LAN with the sds7102? Or even just suggestions?
Jasco UV-870 - Page 1
Forum section: electronics / testgear

author: sixtimesseven
author_rank: Frequent Contributor
timestamp: May 11, 2018, 02:47:14 pm
content: Today I received an Jasco 870-UV detector from an local second hand reseller. I've seen the listening and since I was searching for a spectrometer I vigured that I might at last be able to reuse the optical parts for the 80$.Turns out the instrument splits the light first before passing it trough a flow cell and measures transmission at specific wavelenghts. Pretty neat esp. since the UV Deutrium source still tests good.I've taken the instrument and the optical assembly apart. Pictures are on Flickr:https://flic.kr/s/aHskAXZWmmMost of the device is ocupied by the large aluminium block for the optical assembly. Electronics looked good. The "attachment" of the main PCB assembly was really surprizing to me. No screws at all, just some foam to wedge it into the casingJasco user manual, Firmware files, data sheets etc. here:https://www.dropbox.com/sh/a56racy8zyyjhru/AADewnek1sSfhh41NLH2zWI1a?dl=0The interface is a real pain to use. It has a so called "LC-NET" bus which is mentioned in the manual. But, proprietary and no documentation whatsoeverIt seems to be a pretty standard One-Wire UART bus. Unfortunatly, without the Jasco 801-SC system controller attached the device stays silent during booting. Any ideas or documentation to the LC-NET or the 801-SC controller would be much apprechiated. Currently I'm running a phython script sending one printable ASCII character and one non printable character as a terminator at all possible uart baud rates and combination in a brute force approch in the hopes that it sends something back eventually
Original price of the HP 8753E ? - Page 1
Forum section: electronics / testgear

author: rfspezi
author_rank: Regular Contributor
timestamp: May 08, 2018, 05:13:11 am
content: Does anybody know the original price of the HP 8753E vector network analyzer when it came out about 30 years agoe? (only from curiosity)

author: kultakala
author_rank: Regular Contributor
timestamp: May 08, 2018, 12:00:58 pm
content: You mean the first model 8753A ?It appeared first in the 1987 catalog and base model was $ 23500 !

author: rfspezi
author_rank: Regular Contributor
timestamp: May 08, 2018, 05:36:41 pm
content: The 8753E would be of interest to me.

author: mbless
author_rank: Regular Contributor
timestamp: May 08, 2018, 05:59:15 pm
content: From what I found by the time the 8753E was in the catalog they stopped including prices.

author: EE-digger
author_rank: Frequent Contributor
timestamp: May 09, 2018, 01:51:49 am
content: The Keysight ebay store shows list prices on most equipment.8753ET (6GHz) - $51,571(3 GHz) - $33,358Not sure what the "T" adds to it.

author: kultakala
author_rank: Regular Contributor
timestamp: May 09, 2018, 09:01:24 am
content: According to the datasheet...8753ES has S-parameter test included, but the 8753E had it too !?Maybe they added the S when the 8753ET model came out, which adds built-in transmission/reflection test.

author: rfspezi
author_rank: Regular Contributor
timestamp: May 09, 2018, 09:57:06 am
content: Quote from: kultakala on May 09, 2018, 09:01:24 amThe 8753E got the testset built in aswell.

author: EE-digger
author_rank: Frequent Contributor
timestamp: May 10, 2018, 01:34:08 am
content: From the 99 databook:"HP 8753ET, withits more economical transmission/reflection test set"It can only test reflection and transmission in one direction.Shoulda been cheaper

author: rfspezi
author_rank: Regular Contributor
timestamp: May 10, 2018, 09:14:26 pm
content: I guess I found a good answer here:QuoteSource:http://www.microwavejournal.com/articles/print/2223-increased-speed-and-performance-from-an-rf-vna
176 Pulsed high current fixture - Page 1
Forum section: electronics / testgear

author: drtube
author_rank: Contributor
timestamp: May 10, 2018, 03:15:14 pm
content: Hello,I have a working TYPE 576 Tektronix curve tracer and I would like to purchase one of the 176 plugins available on ebay as an upgrade.https://www.ebay.com/itm/112635643898?ul_noapp=trueSince this equipment is very very old and even the cheapest unit is very expensive ($450) I would like to know if there is some owner of this plugin around here or someone who has used it, my questions are these:1) Is it really worth it? What I mean by this is the real capacity of the plugin to test, perhaps, a high power IGBT module, MOSFET module, SCR module, etc. For the lucky ones who have it (and have experience with it), would you buy it for $450?2)Is this plugin known for having rare and no-solution issues? The seller claims that the fixture "has been tested by their technician" but I don't know since there were no details at all, no photos of the testing, etc..3) In case of bad luck or bad testing from the seller (plugin with problems), would you consider this plugin to be user-reparable? We have some skills and we would buy parts from china/eeuu/digikey.Thank you all for your time!DrTube
AM Scope for PCB rework, looking for advice/comments - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: May 10, 2018, 10:03:13 pm
content: This one is advertised as trinocular, however I can't actually see the 3rd porthttps://www.ebay.com/itm/AmScope-WF10x-20-Trinocular-Boom-Stereo-Microscope-Fluorescent-Light/222965951497?hash=item33e9ce6c09:g:3IcAAOSwJpda40ZHThis one has 5x, 10x, 15x and 30x, and definitly has the camera port.https://www.ebay.com/itm/AmScope-5X-10X-15X-30X-Trinocular-Stereo-Microscope-with-Single-Arm-Boom-Stand/140927801180?epid=24012033458&hash=item20cff3975c:g:QgQAAOSwrklVaObaOr perhaps this one with the ring lighthttps://www.ebay.com/itm/AmScope-5X-10X-15X-30X-Boom-Stand-Trinocular-Stereo-Microscope-Fluo-Light/400429191304?epid=1437317207&hash=item5d3b709088:g:L1oAAOSwl8NVaOcAOr, is there something better for the same price point?I don't need the camera now, but will likely get one in the future, not sure on camera source and compatibility?

author: BillB
author_rank: Unknown
timestamp: May 10, 2018, 10:14:24 pm
content: The first one is definitely not. You can tell by the model number: SW-3B24X-FRLGetting the trinoc now, if you plan on adding a camera is a good idea. Otherwise you can aways get a binoc and then get an eyepiece camera later.If you can swing it, a zoom 7X-45X is really nice over the fixed:https://www.ebay.com/itm/AmScope-SM-3T-7X-45X-Trinocular-Stereo-Zoom-Microscope-on-Single-Arm-Boom-Stand/190807585070?epid=10011374527&hash=item2c6d04b12e:g:FTMAAOSwKOJYGmhjBut, you're gonna wanna add a .5X barlow to that as well for another $20-$30.

author: mbless
author_rank: Regular Contributor
timestamp: May 11, 2018, 02:17:12 am
content: I agree that a continuous zoom is the way to go. With different component sizes and regions of interest you don't want to be locked into fixed fields of view.

author: Jester
author_rank: Frequent Contributor
timestamp: May 12, 2018, 01:42:38 pm
content: Quote from: BillB on May 10, 2018, 10:14:24 pmOrdered the zoom version in your link, I ordered the Barlow lens from another source, when I enquired about adding the Barlow to the original order they quoted me an additional $100 which is odd because they advertise the lens for $49, I enquired as to if the lens they would supply was different and they replied no. So I ordered from another vendor for $19.Looking forward to getting it, my triple combination of glasses, + goggles + loop is just not cutting it any more;-)Thanks for your suggestions.I'm going to start looking for a bargain camera.

author: BillB
author_rank: Unknown
timestamp: May 12, 2018, 02:17:55 pm
content: Congrats, its a great scope. Don't know why they would charge that much extra for the barlow.
HP 4195A network/spectrum analyzer repair - Page 1
Forum section: electronics / testgear

author: fenugrec
author_rank: Frequent Contributor
timestamp: March 05, 2018, 09:31:06 pm
content: Hi,(wasn't sure whether to post this in the Repair subforum or in here, since it's a test equipment repair !)I recently acquired a defective HP 4195A network / spectrum analyzer, with a symptom which I believe is fairly common on these units : no display on power on, two LEDs "EXT REF" and "UNLOCK" on front panel that stay on.I thought I'd try my hand at making a repair video :https://youtu.be/0VhyDC1DTCkdidn't turn out as nice as I hoped : I thought I was filming in 720p but it was actually 720x480 !Does anyone have a copy of the "Adjustment program" floppy disk for these units ? I'm not equipped to do a full calibration / adjustment on these but I'd be interested in checking out the software.

author: gkar
author_rank: Newbie
timestamp: May 08, 2018, 08:55:30 pm
content: Standard problem with these units is the NiCd cell battery.If the battery is dead, the unit will not start at all.Replace the battery with the same type and capacity.The battery normally lasts around 10 years, so put a sticker on the 4195A and replace it in 5 years intervals!I'm told that the battery contains calibration data. To not lose this data, make sure to power the battery pins on the PCB externally when replacing the battery.If the 4195A battery is dead, it doesn't matter of course.Even if one has no intention to use a dead 4195A, remove the battery. They leak and destroys the PCB.The instrument works without the calibration data, but starts up a bit rough in performance.I do not have the software, but please let me know if you find it!

author: TAMHAN
author_rank: Frequent Contributor
timestamp: May 09, 2018, 12:15:16 am
content: Lovely video, grec.I can recall there is a service menu, at least I used it when I was in Ljubljana to pick up mine. But the tests dont say much.Also, be prepared to exchange a DAC in the bottom unit...
picoscope 3223 - Page 1
Forum section: electronics / testgear

author: scope user
author_rank: Newbie
timestamp: May 08, 2018, 06:13:26 pm
content: Does anyone know if the pico 3223 scope can run the newest version of automotive software, version 6.12.7.2724, I have found a good used one and just curious if the older model would have any issues with the newer software. Thanks

author: HighVoltage
author_rank: Super Contributor
timestamp: May 08, 2018, 06:28:26 pm
content: As far as I know, all new pico scope software support older scopes.At least I never had a problem, using the latest software on older scopes.

author: scope user
author_rank: Newbie
timestamp: May 09, 2018, 03:41:54 am
content: Thank you, for the response.I'm looking to upgrade to a better auto scope and found a good old picoscope.

author: _Wim_
author_rank: Super Contributor
timestamp: May 09, 2018, 08:29:17 pm
content: If you go to the downloadsection of the pico website, you see the 3223 is listed under the discontinued products. If you select it, you get a list to the lastest supported software packages. So I would say the lasted version is not supported any more for this one...
Mains Fuse Placement in bench test equipment - Page 1
Forum section: electronics / testgear

author: Gregg
author_rank: Super Contributor
timestamp: May 07, 2018, 02:09:23 am
content: For mains powered test equipment such as oscilloscopes or bench meters, should the fuse be in the mains circuit before or after the power switch and why? I can see arguments for both cases.

author: tautech
author_rank: Super Contributor
timestamp: May 07, 2018, 02:15:17 am
content: If it's powered by SMPS and has a standby rail for power ON it needs be at the point of entry.

author: pigrew
author_rank: Frequent Contributor
timestamp: May 07, 2018, 02:15:23 am
content: An additional question: where should the EMI filter be and why?

author: tautech
author_rank: Super Contributor
timestamp: May 07, 2018, 02:16:34 am
content: Quote from: pigrew on May 07, 2018, 02:15:23 amAfter the fuse so if it blows the fireworks are contained.

author: Gregg
author_rank: Super Contributor
timestamp: May 07, 2018, 02:24:26 am
content: Quote from: tautech on May 07, 2018, 02:15:17 amThat makes sense, the power is needed for the switch activate on the rest of the device.I just put a linear power supply into my FeelTech FY6600 along with a C14 grounded outlet, a proper fuse and holder; the question popped into my head while wiring it. If the fuse blows and I can turn off the switch, I don't have to unplug it.I decided that if the fuse is ahead of the cheap Chinese switch it may be of some advantage and I'd probably unplug it anyway if the fuse blew; that's how I wired it in any case.

author: Brumby
author_rank: Unknown
timestamp: May 07, 2018, 07:39:13 am
content: Quote from: Gregg on May 07, 2018, 02:24:26 amor ANY switch for that matter. Being cheap or Chinese doesn't change the value of the fuse being first ... just the odds of finding out.QuoteA healthy approach. Get used to doing this every time for everything.

author: Neilm
author_rank: Super Contributor
timestamp: May 07, 2018, 05:44:11 pm
content: IEC61010 (the standard for test & measurement equipment) does give guidence on this. IIRC, EMI filters are allowed to be before the fuse (for instance built into the mains socket). The fuse should definately be before the switch though.
Metrix OX7520 Scope - Page 1
Forum section: electronics / testgear

author: tonydix
author_rank: Newbie
timestamp: May 07, 2018, 01:19:42 pm
content: I have a Metrix OX7520 oscilloscope but it does have a few small problems so I have scouring the net for a user and workshop manual for this beast without any success.Does anyone know where these can be obtained or can anyone offer any help with this scopel?Many thanks for any help.Tony

author: GerryBags
author_rank: Frequent Contributor
timestamp: May 07, 2018, 01:39:17 pm
content: How's your French?http://www.supermanuals.com/PDF-Users_Guide_ITT_METRIX_OX_7520_French-en-Djrzt9x9jf.pdf

author: shakalnokturn
author_rank: Super Contributor
timestamp: May 07, 2018, 07:49:52 pm
content: I doubt there is any service information out in the wild at all.There were user manuals around as those scopes were sold by truck-loads to the french high-schools back in the late '80s early '90s, not a single teacher has saved a copy and put it online. (No surprise to me, I found most of them hopeless as teachers.)Have you tried inquiring at Chauvin-Arnoux or Manumesure for documentation?If all else fails the analog section is likely going to be identical to the OX722 and OX725 scopes, there is a poor quality scan around with hard to read schematics.Common problems are failure of the HV shunt regulation and brightness control, bad contacts in the switches on the attenuator / timbase daughter boards. (They are an ass to get to.)I have never worked on the digital storage so can't help there.What are your problems?
Best Signal generator (on budget) ? - Page 1
Forum section: electronics / testgear

author: Mozee
author_rank: Contributor
timestamp: May 10, 2018, 11:32:37 am
content: Hello friendsI am currently looking for a suitable Function (Signal?) generator for my home hobby lab. Preferably a budget one. I've seen the FY6600 and JDS6600 and both seem to be good (when working ofcourse), But knowing that they seem to have Firmware issues keeps me from buying them unless someone can recommend a more bug free firmware version etc.. )any suggestions are highly appreciated!

author: Candid
author_rank: Regular Contributor
timestamp: May 10, 2018, 12:01:30 pm
content: Both of them are worth the money. The FeelTech got some updates and currently you should only get the latest version 3.2 or 3.2.1 when you order from big sellers like AliExpress or Bangood and look after sellers that sold enough of them. The JD6600 out of the box is doing fine. I don't know about similar issues with different versions like with the FeelTech.But you may want to wait for the new FeelTech model 6800 that should arrive soon on the market. If FeelTech made their homework it should solve many of the early FY6600 issues and it's firmware should be upgradeable. This may open the world for open source firmware in future.

author: ra-ma
author_rank: Contributor
timestamp: May 10, 2018, 02:49:22 pm
content: Have a look for the Feeltech here:https://www.eevblog.com/forum/testgear/feeltech-fy6600-60mhz-2-ch-vco-function-arbitrary-waveform-signal-generator/

author: pigrew
author_rank: Frequent Contributor
timestamp: May 10, 2018, 03:20:41 pm
content: What are your requirements? What frequency range? Do you need arbitrary waveforms? Analog modulation input? Computer control? Output power (min and Max)? THD limit? Harmonic distortion limit?
Rigol DSA 815 Spectrum Analyzer - Page 1
Forum section: electronics / testgear

author: ardy41
author_rank: Newbie
timestamp: May 07, 2018, 03:37:41 pm
content: When using the Rigol DSA 815, I occasionally receive error code 413 - Intermediate frequency signal out of range.What does this mean?What can I do to avoid the error?Is there any damage being done to the DSA 815 or the DUT that I am working on?ardy41Richard
Tektronix 434 - Page 1
Forum section: electronics / testgear

author: Majorbob
author_rank: Regular Contributor
timestamp: May 07, 2018, 09:24:25 am
content: Hi all, I have an old Tektronix 434 that is behaving oddly. I have a display but it's not drawing in the horizontal at all. It doesn't matter where the time/div switch is unless it's in the micro second range where I don't even get a dot. In the picture is the calibration mode which should have a selection of horizontal lines top and bottom. First picture is the display, second picture is the settings.
BM235 Fuse  - Page 1
Forum section: electronics / testgear

author: jordanp123
author_rank: Regular Contributor
timestamp: May 05, 2018, 11:17:57 pm
content: Just looking through the BM235 manual for fuse replacement and it lists the SIBA 7012540.0,4 as a suitable replacement (At a lower breaking voltage), but looking at the specifications sheet it doesn't list a DC breaking voltage. It seems odd to recommend a fuse thats rated only for AC current breakage in a DMM, or did I miss the DC listing somewhere?

author: tautech
author_rank: Super Contributor
timestamp: May 06, 2018, 10:22:17 am
content: Dave's normally got them in a pack from his shop but the link returns 404 error.Sent him a mail about it including a link back to here.

author: nanofrog
author_rank: Super Contributor
timestamp: May 06, 2018, 12:47:14 pm
content: The fuse is only there for the AC side. DC conditions are handled using circuits.

author: Seppy
author_rank: Unknown
timestamp: May 07, 2018, 01:10:05 am
content: Quote from: tautech on May 06, 2018, 10:22:17 amHello,What link resulted in a 404 error and where did you click the link? The URL for the fuse has changed.As a side note we currently have no stock.

author: tautech
author_rank: Super Contributor
timestamp: May 07, 2018, 02:09:29 am
content: Quote from: Seppy on May 07, 2018, 01:10:05 amIt was this one from the shop drop-down menu but it's working now.https://www.eevblog.com/product/multimeter-fuse-pack/There's a least one other link there that's still returning 404.
Alcatel vacuum pump manual? - Page 1
Forum section: electronics / testgear

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: May 06, 2018, 02:17:28 am
content: A bit off topic, but I am wondering if anyone knows of a website or service that would have vacuum pump manuals. In particular I am looking for an ATH31+ vacuum pump and the mini-board controller manual.
TDS-380 NVRAM Backup via GPIB? - Page 1
Forum section: electronics / testgear

author: reject902
author_rank: Newbie
timestamp: May 05, 2018, 04:40:47 pm
content: I had posted this over in the Tek forums last week, but didn’t receive any replies so I thought I’d give it a try here.I recently acquired a TDS-380 in working order, with the old Dallas DS1644-120 still ticking and clinging on to the calibration constants.I was wondering if there’s a method for me to backup this NVRAM via GPIB before the battery in it finally gives up. I’ve been searching around the forms here, and can see people who have had success with other scopes in the 500 and 700 series, but didn’t see anything on the 300 series.I do have access to both NI ISA and PCI GPIB cards, and also access to older pentium class machines to work with on this.Thanks