hybridfree/eevblog-posts huggingface dataset:
HP53131A A few questons - Page 1
Forum section: electronics / testgear

author: G0WZB
author_rank: Regular Contributor
timestamp: March 09, 2016, 10:40:44 pm
content: Hi AllJust aquired an Unused HP53131a counter with 3ghz option fitted but and to my suprise it has the some options fitted that i was not expecting but not 100% sure on what one of them is.It has an Oven timebase but I'm confused by which one it is.Printed On the back of the case there is a box listing options 001. 010 and 012. There is black dot next to option 001 so I assumed that meant I had the Medium Stability Oven BUT theres also a blue sticker on back beow this saying option H12....does that mean it has the Ultra High Stability option? I havent seen it refered to as "H" before so is this something else?Also how can i tell if these are original parts or clones...There is HP warranty void stickers over screws if that means anything.Thanks for any advice and sorry for dumb question, Im just not familiar with how HP mark there options.BrianG0WZB

author: KE5FX
author_rank: Super Contributor
timestamp: March 09, 2016, 11:53:01 pm
content: 'Hxx' options on HP instruments are usually customer-specific, and often impossible to decipher. Often -- but not always -- it means a lower performance part was installed to keep costs down on a high-volume deal.It's very unlikely to have any sort of "clone" OCXO inside, but it might use a different 10811 OCXO than the one the majority of 53131As with the ovenized reference option shipped with. Open it up and have a look. If it has a 10811 OCXO, there's probably a five digit suffix on the part number ("10811-60111" or something like that).... and if so, it may be possible to look up that suffix, as quite a few of them were documented.

author: TheSteve
author_rank: Unknown
timestamp: March 10, 2016, 12:06:33 am
content: Google found this regarding the H12 option - H12: MOD configuration (minor enhancements on sinewave & Pulse sensitivity and power supply additional accessories and labling)Certainly nothing to do with regular option 012 which is the highest stability time base.

author: sportq
author_rank: Regular Contributor
timestamp: March 10, 2016, 08:08:07 am
content: MOD = Ministry of Defence (UK). That would fit with KE5FX's comment that it's a customer specific option.

author: G0WZB
author_rank: Regular Contributor
timestamp: March 10, 2016, 08:49:17 pm
content: Hi AllThanks for the feedback.I didnt want to break the warranty void stickers ...but then thought sod it lolThe 3Ghz module is a genuine hp as is the Oven which is an 001 which I beleive is the Medium Stability timebase It was just the option H12 sticker that was confusing me.The firmware reports as Rev 3703, Is that the latest version im wonderingAnyway A few pics of why i was confused at first

author: TheSteve
author_rank: Unknown
timestamp: March 10, 2016, 10:28:23 pm
content: I would think there is likely newer firmware - the 53132A is around 48xx for the current rev. However new firmware also requires a calibration so may not be worth the effort.
Test Equipment Depot Discount? - Page 1
Forum section: electronics / testgear

author: riverrat373
author_rank: Contributor
timestamp: March 09, 2016, 09:08:19 pm
content: Does anyone know if Test Equipment Depot has any discount codes for EEVblog members?

author: PedroDaGr8
author_rank: Super Contributor
timestamp: March 09, 2016, 09:46:18 pm
content: Quote from: riverrat373 on March 09, 2016, 09:08:19 pmNope, AFAIK only TEquipment.net has an EEVBlog specific discount. They work hard to maintain a relationships with the community here, often follwing up on issues raised in this thread and they aren't afraid of wading into a thread even if they have messed up a lot.

author: riverrat373
author_rank: Contributor
timestamp: March 09, 2016, 09:50:50 pm
content: Quote from: PedroDaGr8 on March 09, 2016, 09:46:18 pmSaelig says they will offer EEVblog members a discount too.

author: PedroDaGr8
author_rank: Super Contributor
timestamp: March 09, 2016, 09:51:47 pm
content: Quote from: riverrat373 on March 09, 2016, 09:50:50 pmOk so add Selig to that short list. Test equipment Depot has never shown up here.

author: uncle_bob
author_rank: Unknown
timestamp: March 10, 2016, 01:05:44 am
content: HiKeep in mind that the margins in the test equipment distribution business are pretty slim. The way these guys make money is by moving inventory a lot of times a week / month / year rather than high markups and little action. The offshoot of that is the basic fact that a discount code rarely works on an "on sale" item. In fact, finding a blowout sale on this or that likely gives you more off (on Cyber Monday) than any discount code you might find.Bob

author: bson
author_rank: Unknown
timestamp: March 10, 2016, 01:26:23 am
content: Quote from: riverrat373 on March 09, 2016, 09:50:50 pmThey do, and I got the EEVBlog discount when I bought an SDG2122X from them. PM rickv14623 for a code.

author: rickv14623
author_rank: Frequent Contributor
timestamp: March 10, 2016, 02:24:13 pm
content: Quote from: bson on March 10, 2016, 01:26:23 amPM to the OP
Keysight seminar in Toronto - Page 1
Forum section: electronics / testgear

author: Bud
author_rank: Super Contributor
timestamp: March 09, 2016, 04:45:20 am
content: Some techno p0rn from today's Keysight High Speed Digital seminar in Toronto

author: Bud
author_rank: Super Contributor
timestamp: March 09, 2016, 06:01:35 am
content: Among other things they talked about resolving discontinuities as small as 1mm (can you believe that) using a TDR accessory head for their DSA-X wide bandwidth scope. Sampling is done in the time domain, converted to frequency domain and the pre-measured S-parameters of the fixture are removed, then convert the result back to the time domain so only changes in the trace related to the discontinuity itself is left.
gpib software for my racal-dana 1992 counter - Page 1
Forum section: electronics / testgear

author: davebb
author_rank: Frequent Contributor
timestamp: February 26, 2016, 12:26:19 am
content: Hi has anyone got gpib software for my racal-dana 1992 counterthanks Dave

author: BloodyCactus
author_rank: Frequent Contributor
timestamp: February 26, 2016, 02:17:39 am
content: gpib commands are in the manual. it does not follow scpi specification so there is no like, IDN*? commands etc.

author: bitseeker
author_rank: Super Contributor
timestamp: February 26, 2016, 02:37:22 am
content: I have the same counter and have not seen software for it. Note that if you have a military version of the counter, there may be a jumper on the GPIB board (SK4, 4 pins) to switch it between "military" protocol and native Racal.

author: davebb
author_rank: Frequent Contributor
timestamp: February 26, 2016, 06:43:23 am
content: Hi thanks for the info, I will look in manual,and the jumperdo I need it to read/be in std racal mode?Thanks Dave

author: bitseeker
author_rank: Super Contributor
timestamp: February 26, 2016, 07:33:47 am
content: Unfortunately, I don't have access to it at this time. I can probably check this weekend if mine has the jumper.

author: Thomas
author_rank: Regular Contributor
timestamp: March 08, 2016, 08:40:34 am
content: Here's a picture of my military GPIB board:Look at the SK4 jumper on the lower right. To get normal GPIB communication, put the jumper on the two upper pins (NOT like on the picture).

author: davebb
author_rank: Frequent Contributor
timestamp: March 08, 2016, 12:39:30 pm
content: Thanks for that info, I will have a lookThanks Dave

author: phoenixcomm
author_rank: Newbie
timestamp: March 08, 2016, 04:25:06 pm
content: What do you want to do with GPIB? Its a rather simple protocol and it parallel 8bit wide and it uses a master-slave. look athttp://egirland.blogspot.com/2014/03/arduino-uno-as-usb-to-gpib-controller.html.should be easy to do, there might even be a shield for it already.C. Harrison.

author: bitseeker
author_rank: Super Contributor
timestamp: March 09, 2016, 04:32:51 am
content: Thanks for posting your photo, Thomas, since I didn't get to pull mine apart earlier. I just checked and mine has the same SK4 jumper (same PCB assembly number).
Siglent Scope FFT for audio? - Page 1
Forum section: electronics / testgear

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: March 08, 2016, 06:46:17 pm
content: So I have an older siglent scope 1022DL 25Mhz and it has served me well the FFT is great for finding harmonics! Right now Im doing some audio projects, and trying to benchmark reference gear. So I wanted to run white noise through the DUT and then view the eq/filtering in an FFT view. I can get this done most likely with my USB scope or an FFT program on the PC with a hi quality audio interface.The thing is using my scope is quick and convenient for a crude test the scope is just there dont have to set up a bunch of other junk, especially if its just a ballpark look. The thing is my FFT zooms in to 10x, but even there it goes way up in to the mhz and the audio spectrum is only tiny portion that is almost 3db higher than the rest. Is this common, or am I just doing something wrong? I would think a 25mhz DSO would be overkill for simple audio measurements....As I said this is all about convience, I plan to do real testing with an analog scope and 192khz sound interface with proper software, at this point I just want to see a quick filter curve of the whole audio spectrum using white noise as I said.

author: nctnico
author_rank: Super Contributor
timestamp: March 08, 2016, 07:55:56 pm
content: You have to force a lower samplerate by reducing the acquisition memory length and select long time/div setting. You'll see the frequency span gets reduced and you'll be able to get into the audio frequency range.

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: March 08, 2016, 09:35:20 pm
content: Ahhh thanks go it working now
tektronix-dmm 830 - Page 1
Forum section: electronics / testgear

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: March 08, 2016, 06:53:09 pm
content: What is the origin of this tek DMM 830? To me don't seems north american.http://produto.mercadolivre.com.br/MLB-741638558-multimetro-tektronix-modelo-dmm-830-_JM#questionText

author: rosbuitre
author_rank: Regular Contributor
timestamp: March 08, 2016, 07:11:42 pm
content: Quote from: SAUL BRITTO on March 08, 2016, 06:53:09 pmHiI have the DMM916, very similar and is made of TaiwanRegards

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: March 08, 2016, 08:51:16 pm
content: Quote from: rosbuitre on March 08, 2016, 07:11:42 pmMeno male that isn't chinese amem! Looks like a good DMM. Thank you for your answer.

author: retiredcaps
author_rank: Super Contributor
timestamp: March 09, 2016, 01:26:09 am
content: Quote from: rosbuitre on March 08, 2016, 07:11:42 pmTeardown here.http://mrmodemhead.com/blog/tektronix-dmm912-teardown/We speculate the OEM is APPA Technology.PS. Dave also bought a whole bunch of them in an auction and did a mailbag segment on them.
New Fluke 120B series Scopemeter - Page 1
Forum section: electronics / testgear

author: EEVblog
author_rank: Unknown
timestamp: March 11, 2016, 02:39:11 am
content: So Fluke have a new Scopemeter, redesigned from the ground up according to them.http://en-us.fluke.com/products/portable-oscilloscopes/fluke-120b-series-industrial-scopemeter-hand-held-oscilloscopes.htmlThe 40 MHz or 20 MHz bandwidth for the scope is perfected fine for the intended task, but that 40MS/s converter is so 1990'sThe recorder function has 400M point memory which is fine, but it seems the real time sampler only has a sample memory of 512 points. That'spoints.Although I can't find that actually stated anywhere apart from Newark:http://www.newark.com/fluke/fluke-123b-na/handheld-oscilloscope-20mhz-25msps/dp/76Y6232User manual:http://media.fluke.com/documents/6006986a-en-120b-scope-ds-e.pdfhttp://media.fluke.com/documents/12xB____umeng0000.pdf

author: marber
author_rank: Regular Contributor
timestamp: March 11, 2016, 08:45:16 am
content: Quote from: EEVblog on March 11, 2016, 02:39:11 amSounds very Danaher?
Fluke TPAK vs. H80M - Prices - Page 1
Forum section: electronics / testgear

author: mos6502
author_rank: Frequent Contributor
timestamp: March 07, 2016, 11:36:35 am
content: http://de.rs-online.com/web/p/multimeter-taschen-und-holster/3669444/http://de.rs-online.com/web/p/multimeter-taschen-und-holster/4802406/What are they smoking?
MOVED: TS-100 Soldering Digital Oled Iron & complete 3D body handle  - Page 1
Forum section: electronics / testgear

author: Simon
author_rank: Unknown
timestamp: March 07, 2016, 06:32:46 am
content: This topic has been moved toOther Equipment & Products.https://www.eevblog.com/forum/index.php?topic=64300.0
Gossen Metrawatt IR to USB Transceiver - Page 1
Forum section: electronics / testgear

author: tsaG
author_rank: Contributor
timestamp: February 09, 2016, 09:12:48 pm
content: Hi,does anyone have this IR to USB adapter (I think thats all it is) and can do some pictures of the circuit? Or is there something like a circuit available? I just got a Gossen X-Tra cheap on eBay and I'd like to use the data logging functionality.. but 271€ for a simple IR to USB adapter is to much for thatOr Is it possible to use a simple IR to USB adapter? Did anyone try this?Thanks

author: MatthiasBerlin
author_rank: Newbie
timestamp: March 05, 2016, 09:11:25 pm
content: The communication is infrared using the SIR encoding also used by IrDA (signal inverted, bits have only 3/16 of the normal length). However, an ordinary USB to IrDA adaptor does not work, I tried.Someone else built a replacement for the "Starline Series", which includes the X-Tra:See here!
Looking for TDSJIT2 software installer for Tek TDS7404 scope - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: March 03, 2016, 11:23:52 am
content: I've just recently repaired a Tek TDS7404 scope with options 4M, J1, and J2. The disk drive was a total loss, so after rebuilding it, I am missing option J1 which is TDSJIT2 Jitter Analysis application. The software is not on Tek's site and I'm hoping someone here may have a copy. As of now, it also shows option J2 missing (TDSDDM2 Disk Drive Measurements application) which I do have a copy of but don't need.If anyone has a copy they could share, I'd be very grateful. In the meantime, I'll send an email to Tektronix support to see if they can help out.Thanks!Jay

author: Jwalling
author_rank: Unknown
timestamp: March 03, 2016, 05:53:12 pm
content: Some more information if it helps...It originally came on a CD with Tek part # 063-3914-06Jay

author: Jwalling
author_rank: Unknown
timestamp: March 05, 2016, 12:07:10 pm
content: I got a copy from Håkan who frequents the Tekscopes Yahoo group. The scope is up and running now with the TDSJIT2 software.Thanks Håkan!If someone would like to host the program or wants a copy, let me know!Jay

author: TiN
author_rank: Super Contributor
timestamp: March 05, 2016, 12:18:41 pm
content: I'll host itUpload by link down in my sub.I had some CD images for TDS too:Optional Apps for TDS7xxx, 1078Optional apps for TDS7xxx, 1883

author: Jwalling
author_rank: Unknown
timestamp: March 05, 2016, 12:33:37 pm
content: Quote from: TiN on March 05, 2016, 12:18:41 pmYou got it my friend. I just uploaded it now.Quote from: TiN on March 05, 2016, 12:18:41 pmI already got those in my quest, but they are missing TDSJIT2. Thanks, some of that could be useful in the future.Jay

author: TiN
author_rank: Super Contributor
timestamp: March 05, 2016, 02:28:00 pm
content: Thanks.It's here now :TDSJIT2 v1.2 for TDS7000 series

author: Jwalling
author_rank: Unknown
timestamp: March 05, 2016, 04:45:16 pm
content: Quote from: TiN on March 05, 2016, 02:28:00 pmYou're welcome. Tektronix support replied with a private link to the software that I could download for a period of seven days, even though the scope is long out of support. It was one revision earlier than the one I got from Håkan.So a thumbs up for Tektronix support as well!Jay
Good quality HF spectrum analyser - Page 1
Forum section: electronics / testgear

author: rch
author_rank: Regular Contributor
timestamp: February 25, 2016, 12:09:57 am
content: I have been reading with interest the thread on getting a first SA.https://www.eevblog.com/forum/testgear/first-spectrum-analyzer-new-rigol-used-hp-on-ebay/I think I have similar requirements to the poster except that the main project I want it for is working between 2MHz and 30MHz. I do however need good amplitude accuracy, reasonable frequency accuracy (though I suppose I can check with a Rigol scope I have), a reasonably narrow resolution bandwidth (no experience to be sure how narrow, but certainly below 1kHz) and decent noise performance as one of the jobs I will be doing involves setting up low noise amplifiers for low signal transducers.Are there any decent second hand machines around with a low maximum frequency or would only very second rate spectrum analysers or very old noisy and unstable analogue ones be available in the sub 100MHz region? Do I have any reasonable options additional to the options discussed in that thread? Is the Rigol still a good contender on a low budget for my needs? I'd rather pay much less!Many thanks for any comments.

author: Unknown
author_rank: Unknown
timestamp: February 25, 2016, 12:58:54 am
content: Tip: old microwave system analysers can sometimes be found for cheap, especially if not paired with their transmitter. They're designed for comissioning/testing microwave links using the 70/140MHz IF, so generally span 100Hz to 300MHz with RBW & VBW from 100Hz to 300kHz, reasonable gain / attenuation / noise figures for HF use, etc.Downsides: usually 75ohm, no service info available. The first can be worked around; the second is why they're often so cheap

author: rch
author_rank: Regular Contributor
timestamp: February 25, 2016, 01:03:52 am
content: Quote from: Tac Eht Xilef on February 25, 2016, 12:58:54 amThat's interesting. Are they made by the big test equipment firms, or are they more specialised or local firms?

author: Unknown
author_rank: Unknown
timestamp: February 25, 2016, 01:40:07 am
content: Most of the ones I've seen have been from the more telco/comms focussed manufacturers e.g. Anritsu (now Wiltron, or visa-versa - I forget), Wandel & Goltermann, R&S, etc. I also recall HP made some, and no doubt others as well.A quick look around doesn't show anything particularly cheap at the moment, though in the recent-ish past I've seen models like the Anritsu ME538L or ME4510B go for <AU$200 fairly regularly.

author: cncjerry
author_rank: Unknown
timestamp: March 05, 2016, 02:20:27 am
content: I have an Advantest but love the old HP gear as I have an HP 8568b. I would look for an HP 3585a if you want maximal performance for the HF only range. You can find them sometimes on Craigslist and obviously EBay.

author: rch
author_rank: Regular Contributor
timestamp: March 05, 2016, 08:41:09 am
content: Thanks for all the suggestions - I'll keep looking for a bargain!
Brymen (EEVBlog) BM235 Multimeter Verification to Specifications - Page 1
Forum section: electronics / testgear

author: boggis the cat
author_rank: Regular Contributor
timestamp: March 04, 2016, 05:51:17 am
content: For anyone who may be interested, this is the initial data I obtained while verifying my Brymen (EEVBlog) BM235 Multimeter to the manufacturer's specifications.No uncertainties are present, as I haven't bothered to calculate them. These will mostly be ±1 count for DC Volts, but can become significant for AC Current (e.g. 50.00 ± 0.18 mA @ 50 Hz).(PDF has same data as broken out into PNG files.)

author: Performa01
author_rank: Super Contributor
timestamp: March 04, 2016, 10:59:02 am
content: Nice calibration protocol, but ...... what does it actually tell us, other than your particular unit is within spec?While I have no doubt that this will be true for all the others as well, isn't this a bit overkill for a low accuracy meter like this?

author: PedroDaGr8
author_rank: Super Contributor
timestamp: March 04, 2016, 12:26:18 pm
content: Nice work, not too many people have the equipment/lab to do this. Will be very interesting to see 6mo and 12mo data points as well. Thanks a bunch for doing this.

author: boggis the cat
author_rank: Regular Contributor
timestamp: March 05, 2016, 01:39:46 am
content: Quote from: Performa01 on March 04, 2016, 10:59:02 amA single data point doesn't mean much (this could be a rare 'golden unit'), as you are pointing out.This data set was obtained for comparison with an Owon B35T that I obtained earlier. That isn't a bad meter, either (aside from the input protection being very dubious), but nowhere near as stable as the BM235.This meter compares favourably to e.g. the Fluke 179 and is a lot less costly. The better Fluke meters commonly achieve better than 40% of specification when new, then will hold those specs indefinitely.QuoteThis isn't a standard calibration process. I chose to take 5000 count points instead of the usual ninety percent of range (5400 count) in order to make debiations from nominal more obvious, and also let the meter stabilise for far longer to see if any bias would creep in -- and it does, but only one count here or there, and that could simply be boundary conditions tipping the least significant digit.I took down ambient temperature and RH, and also checked the auto ranging roll-over points. I stripped this from the data presented to simplify and improve readability.While this is indeed 'overkill', I hope it may give a better picture of this meter than can be achieved by most verification methods. Having a metrology lab at my disposal, it seemed a worthwhile exercise to have a close look at the main functions on this new-to-market meter that Dave is selling.

author: boggis the cat
author_rank: Regular Contributor
timestamp: March 05, 2016, 01:44:56 am
content: Quote from: PedroDaGr8 on March 04, 2016, 12:26:18 pmThanks for your reply.I'd like to do some environmental limit tests as well, but our lab doesn't have a chamber.In any case, the manufacturer's specifications are not wildly optimistic / total lies (delete as applicable).
Building test equipment from 1980's Practical Wireless - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: March 04, 2016, 08:03:13 pm
content: I've found a really interesting thing to do, and learning lots from it, I'm going through my old practical wireless mag 1980's series and building test gear another fascination of mine, the first item I've built is a basic wobbulator, next which I'm starting tomorrow is a low frequency signal generator, I wonder if anyone else does this type of thing, I love every aspect of it from reading up on it making the PCB sourcing the components, building, then using it.

author: ebastler
author_rank: Super Contributor
timestamp: March 04, 2016, 08:21:51 pm
content: Sounds like a cool project! You might get more feedback on this in the "Projects" section of the forum. Most discussions in the "Test Equipment" section seem to be either about today's commercial test gear, or about high-end professional equipment from the 80s and 90s that has now become affordable.

author: MK14
author_rank: Super Contributor
timestamp: March 04, 2016, 08:38:55 pm
content: Quote from: Negative-Bias on March 04, 2016, 08:03:13 pmSounds like a fun thing to do.I am very tempted (and plan to), do similar, myself. But will probably only go for a few items (construction projects), over time.I sometimes find it a bit painful reading very old electronics magazines. Because I see the amazingly wonderful adverts from the (e.g. 1960s), and sooner or later, something catches my eye. Which I then, really REALLY want! (Hypothetical, but similar example follows).E.g. An amazing machine which shows your feet, using x-rays and a crt tube (or something) like thing. Maybe could be used to examine inside potted electronics and stuff like that. Or these amazing valve/tube based, electronics kits (adverts).

author: Unknown
author_rank: Unknown
timestamp: March 04, 2016, 09:22:02 pm
content: Quote from: MK14 on March 04, 2016, 08:38:55 pmI've seen a few like that, I agree you have to pick and choose, plus the older mag's, seem to use a lot of high voltage circuits, yes it is fun though

author: German_EE
author_rank: Super Contributor
timestamp: March 04, 2016, 10:43:58 pm
content: The nice thing about the older magazines is that there are no PIC or Atmel chips and if there is software they probably list it as part of the article. OK, you might need to change a few transistors to modern types but that's about it.
Deep discounts on some R&S scopes at TEquipment - Page 1
Forum section: electronics / testgear

author: billfernandez
author_rank: Regular Contributor
timestamp: March 03, 2016, 07:28:13 pm
content: Just got an email from Tequipment.net that they're running a promotion on certain Rohde & Schwarz oscilloscopes.HO3516 x Logic Probes (8 Channel)2 Analog Channels500MHzHOO10 serial bus analysis optionHOO12 CAN and LIN signal analysis optionHOO14 segmented memory option$4,864.00HO3516 x Logic Probes (8 Channel)4 Analog Channels500MHzHOO10 serial bus analysis optionHOO12 CAN and LIN signal analysis optionHOO14 segmented memory option$6,254.00HMO10022 Analog Channelswith 100MHz UpgradeHOO10 serial bus analysis optionHOO12 CAN and LIN signal analysis option$1,095.00

author: nctnico
author_rank: Super Contributor
timestamp: March 03, 2016, 08:33:32 pm
content: Your e-mail is in the URL. Unless you want lots of spam I'd remove it.

author: billfernandez
author_rank: Regular Contributor
timestamp: March 04, 2016, 03:54:16 am
content: Quote from: nctnico on March 03, 2016, 08:33:32 pmOops, thanks!
Tek AFG3021C jitter specification changes from 500ps to 60ps in data sheet - Page 1
Forum section: electronics / testgear

author: eenuts
author_rank: Newbie
timestamp: March 03, 2016, 03:51:03 pm
content: Has anyone noticed the change on Tektronix AFG3000 jitter specification ?I found in their old version data sheet, the typical jitter(RMS) value is 500ps (for AFG 3021C under square waveform)http://www3.nd.edu/~jott/Measurements/FAQ/Tektronix_AFG3021_data_sheet.pdfbut the current data sheet of AFG3021C on their website changed the typical jitter(RMS) to 60pshttp://www.tek.com/sites/tek.com/files/media/media/resources/AFG3000C-Arbitrary-Function-Generator-Datasheet-76W282816.pdfThis seems to be a big improvement, but I didn't see any hardware changes to this model.has anyone got idea how this happens? This looks really suspicious to me

author: nctnico
author_rank: Super Contributor
timestamp: March 03, 2016, 03:53:33 pm
content: That is not a change. They just didn't specify the typical value in the old version. IMHO the typical value doesn't say anything because there is no guarantee the instrument will achieve it in all cases.

author: eenuts
author_rank: Newbie
timestamp: March 03, 2016, 03:58:24 pm
content: Quote from: nctnico on March 03, 2016, 03:53:33 pmThey specified the typical value as 500ps in their old version, you may see the picture in attachment
Needed, a service manual for a HP 8698A RF plug in. - Page 1
Forum section: electronics / testgear

author: xwarp
author_rank: Frequent Contributor
timestamp: March 07, 2016, 10:56:07 am
content: Picked up a HP 8690 sweep oscillator with this 8698A plug in and can not locate a service manual for the plug in.The manuals available for the 8690 do not cover the plug ins.Here's to hoping someone has one.

author: rastro
author_rank: Frequent Contributor
timestamp: March 07, 2016, 02:39:37 pm
content: Looks like artekmedia has this on CD. Oddly it's listed on eBay but does not show up on their store web page. Price = $12.95I've bought several hard to find manuals through them. They're good quality.http://www.ebay.com/itm/HP-8698A-RF-Unit-for-8690-Operating-Service-Manual-/390111779095-rastro
EEBLOG DISCOUNT CODE? - Page 1
Forum section: electronics / testgear

author: Ruffyduffy
author_rank: Newbie
timestamp: March 02, 2016, 05:29:44 pm
content: Can somebody please send me the magic code to save some money's?

author: nanofrog
author_rank: Super Contributor
timestamp: March 02, 2016, 05:39:38 pm
content: Please search first; there's already two threads on this.Special Price FOR EEVblog MembersEEVBlog Members Discount at Tequipment?Mods, please remove this thread, thanks.
Keysight N7020A 2.0GHz Power Rail Probe Review, Teardown and Experiments - Page 1
Forum section: electronics / testgear

author: Hugoneus
author_rank: Frequent Contributor
timestamp: March 07, 2016, 04:34:11 pm
content: Watch the video here: [25 Minutes]youtu.be/d_Ybe6xnMIgMore videos at The Signal Path:www.TheSignalPath.com

author: Hugoneus
author_rank: Frequent Contributor
timestamp: March 08, 2016, 08:20:49 pm
content: I forgot to mention in the video that the probe also works with some of the other Keysight scopes, not just the S-Series.

author: rx8pilot
author_rank: Super Contributor
timestamp: March 08, 2016, 08:40:03 pm
content: Super thankful for this video!Way to go, nice choice. Great, useful info.

author: _Wim_
author_rank: Super Contributor
timestamp: March 08, 2016, 08:53:10 pm
content: Thanks again for this very interesting video. Looks like a very nice probe system (especially connected to your scope). The price however is

author: Someone
author_rank: Super Contributor
timestamp: March 10, 2016, 09:19:15 am
content: Quote from: _Wim_ on March 08, 2016, 08:53:10 pmPretty crazy since its just the well known 2 path amplifier, a good reference is The Art and Science of Analog Circuit Design, Roach, Chapter 7. If we could find a suitable BNC connector it would be fun to make a series of DIY active probes.

author: Hugoneus
author_rank: Frequent Contributor
timestamp: March 10, 2016, 09:35:58 pm
content: Quote from: Someone on March 10, 2016, 09:19:15 amIndeed an overall simple architecture. The advantage is that it is well modeled, calibrated, etc.

author: rx8pilot
author_rank: Super Contributor
timestamp: March 11, 2016, 01:27:51 am
content: The details would be rather small on a product like this one despite the visual look of simplicity.Almost all of my work is power electronics - conversion, distribution, and management for sensitive loads. This looks very handy especially when coupled with the software in the scope to help analyze and gain insight.Hoping I win one of the Keysight scopes - I will definitely add one of these.
HP probe power connector replacement? / HP 180AR restoration followup - Page 1
Forum section: electronics / testgear

author: MCRodrigues
author_rank: Contributor
timestamp: March 02, 2016, 12:02:02 pm
content: While restoring my HP 180AR CRO I noticed that the 1802A plugin only has 50Ohm low impedance input. I do not have the adequate probes for it and unfortunately is not economically viable to just buy a pair of active probes, for such ridiculously expensive shipping costs...So I'm going to try make an high impedance active probe adapter similar to those HP 1124A, using a buffer op amp.There is this problem that the probe power is not a standard connector. Its the 3 pin connector described on this post:https://www.eevblog.com/forum/testgear/can-you-help-me-identify-a-connector/So buying two male connectors for the adapters is even worse than buying the probes...I noticed that the probe power connectors have almost the same diameter as the mini-XLR.See the male chassis mount connector:http://mauser.pt/catalog/userfiles/011-0765.pdfWould it be viable to just replace the connectors and keeping the originals for a adapter to compatible devices? Or should instead create a dedicated power supply for it?By the way for those that where following the my repair:https://www.eevblog.com/forum/repair/hp-180a-rack-mount-oscilloscope-repairrestoration/IT'S ALIVE!! Completelly uncalibrated but alive!Will need to make some repairs:- The vertical amplifier (1802A) does not give the right amplitude from the scope calibrator. (Requires calibration or missing the probes?)- The time base (1822A) triggers on all inputs except the internal.- At the time base, the main seep vernier knob works, but the default position switch is stuck and does not light up the uncal lamp.- The Horizontal positioning in the mainframe saturates before the last three graticules of the screen (Main issue!)
Network - TCP/IP - RJ45 interface - voltage meter 0-30V - Page 1
Forum section: electronics / testgear

author: ritchey.
author_rank: Newbie
timestamp: March 01, 2016, 04:21:15 pm
content: Hi guys,Im looking for a remote way to check anytime my solarbank storage voltage which is nearby my small server and router. Is there any price reasonable product under 20 EUR to accomplish this?It can be a complete product or kit to asseble... It should be a network connected voltage meter -Thanks for any ideas

author: supercilious
author_rank: Contributor
timestamp: March 01, 2016, 05:12:02 pm
content: You can easily build one using an ESP8266, a voltage regulator and a couple of resistors... add a TP4056 board and a battery if you want to power it from a battery separately from your solarbank and be able to alert if it goes completely dead.

author: Kilrah
author_rank: Unknown
timestamp: March 01, 2016, 05:27:41 pm
content: $5 Arduino just to measure the voltage, connected to the server for the rest?

author: ritchey.
author_rank: Newbie
timestamp: March 02, 2016, 07:53:29 am
content: Quote from: supercilious on March 01, 2016, 05:12:02 pmThanks for the tip, is this the correct item?http://www.ebay.com/itm/ESP8266-WIFI-Remote-Wireless-Module-WIFI-to-UART-Module-Precise-/131739370477?hash=item1eac4743ed:g:DM4AAOSwQYZWyr40

author: ritchey.
author_rank: Newbie
timestamp: March 02, 2016, 07:56:34 am
content: Quote from: Kilrah on March 01, 2016, 05:27:41 pmhmm, sorry I dont really understand what you mean, is there a cheap arduino kit for his?

author: supercilious
author_rank: Contributor
timestamp: March 02, 2016, 08:56:38 am
content: Quote from: ritchey. on March 02, 2016, 07:53:29 amThat'll do the job, but that particular module is designed for use with an Arduino or other microcontroller driving it via AT commands. You CAN use it standalone, but its a bit of a PITA... much better off getting an ESP-201 or other module with the same chip because it has all the GPIO pins broken out:http://www.instructables.com/id/Programming-ESP8266-ESP-201-stand-alone-with-Ardui/?ALLSTEPSIf you don't want to rely on wifi, and instead would prefer a USB cable for transmission reliability and guaranteed power supply or whatever, a simple Arduino uno or pro mini would do the job:https://blog.udemy.com/arduino-voltmeter/
HMO scopes: "maximum of 24,000 measured value points can only be read out" - Page 1
Forum section: electronics / testgear

author: pxl
author_rank: Regular Contributor
timestamp: February 28, 2016, 04:27:42 pm
content: Hi,I am digging into the HMO manuals (HMO3000 series, HMO Series 72x...202x) and there is something I don't really understand. Under the "Documentation, Storage and Recall" part:"10 .3 Curves In addition to references, you can also store A/D converter data. A maximum of 24,000 measured samples (expanded display memory) can be stored on a USB stick. Curves can only be stored to externally connected USB sticks (not internally).The maximum of 24,000 measured value points can only be read out with the maximum sampling rate(ACQUIRE menu). For the AUTOMATIC setting (repeat rate), the maximum amount of measured value points is limited to 6,000 (default setting)."Does it mean that only 24000 points of data can be saved only from the 2 MPts of memory? Or with the mentioned reference data, is it possible to save the full memory? If so, what is the saving Traces/Curves for?

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: February 28, 2016, 04:40:57 pm
content: Yeah, I fear that is really a somewhat crippling limitation. It's hard to understand where this limitation comes from, maybe slow write speed?Anyway, I understand that you need to use the USB connection to read out the complete buffer, but due to the limitation to 115200 Bits/s (VCOM), this also takes quite a while.

author: gsocker
author_rank: Contributor
timestamp: March 02, 2016, 12:21:12 am
content: Quote from: pxl on February 28, 2016, 04:27:42 pmI just gave this a try with my HMO3054 scope. There is an option in the trace save menu for display or acquisition memory - see the attached screenshot. At least when set to acquisition, it outputs the entire contents of the trace memory - 4MB with one channel active, or 2MB if both channels sharing the same interlaced pair of A-D converters are active.With a single channel, the resulting CSV is ~104MB, and has 4,194,288 lines of values. The text/float/binary options are smaller.Quote from: 0xdeadbeef on February 28, 2016, 04:40:57 pmMine supports USBTMC or VCP(VCOM), though I think this may depend on the interface card in the scope.

author: pxl
author_rank: Regular Contributor
timestamp: March 02, 2016, 12:29:57 am
content: Ah, nice! Thank you, that's make more sense.

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: March 02, 2016, 01:26:45 am
content: Well, I fear this is different in the smaller models. At least in my HMO2024 the above menu looks different and there is no "Points" entry.Actually I think these smaller models can't save their full memory to an USB stick and the 24000Pts limitation described in the manual is correct.
HP 16533 failed triggering --> FIXED :-) - Page 1
Forum section: electronics / testgear

author: fisafisa
author_rank: Regular Contributor
timestamp: February 29, 2016, 08:51:53 pm
content: Hi guys.I just fixed one 16533 with broken triggering.Failed ADC and TRIGGER AND IMB....It was working OK a week ago and I calibrated it successfully.Suddenly I was playing with external triggering and combined triggering from another 16533... and it died, refusing to trigger, only auto triggering when pressing stop.The problem....corrosion under the two plastic sort of skids.Here you see after removing them and removing some flaking coating.The copper had a clear greenish color underneath....https://www.dropbox.com/s/5ht45ppf5d976nw/20160229_204611.jpg?dl=0https://www.dropbox.com/s/1gc0sj5q58rgjms/20160229_204615_001.jpg?dl=0https://www.dropbox.com/s/45rq8ctss3zup8q/20160229_204631.jpg?dl=0https://www.dropbox.com/s/cyrmh188fwoq6ih/20160229_204727.jpg?dl=0https://www.dropbox.com/s/hs8ay6l7dnf9ug0/20160229_205404.jpg?dl=0https://www.dropbox.com/s/wygupskvg535r8m/20160229_205413.jpg?dl=0https://www.dropbox.com/s/inh2762v0jt4mk5/20160229_205421.jpg?dl=0https://www.dropbox.com/s/5vnjoqe3l3sr3km/20160229_211051.jpg?dl=0The fix: soldered wires to replace broken traces.https://www.dropbox.com/s/nbbdp3nmo3a7pg3/20160229_204553_001.jpg?dl=0https://www.dropbox.com/s/2clp05vpz85ktog/20160229_204606.jpg?dl=0Maybe this is a general problem?Some chemical reaction that breaks the conformal coating just at the edge of these skids?There is a sort of black double sided thick spongy tape to stick the skids to the board.These were showing significant aging and were part brittle part still eleastic.Maybe while aging reacted with the conformal coating cracking it and letting moisture in, thus facilitating corrosion.Next step will be reapplying some protection to protect the exposed copper.Anything wrong using a transparent varnish?F
Keysight MSO-X3000 Frequency error - Page 1
Forum section: electronics / testgear

author: AndyP
author_rank: Contributor
timestamp: February 25, 2016, 07:51:15 am
content: I've recently been working with one of Keysight MSO-X3034 (that has been recently calibrated), and noticed it has a 17ppm xtal error, which became obvious when measuring over a few 100 microseconds.I still have a Rohde & Schwarz RTM2054 to try out which (nice 'scope), given the R&S background I'm hoping the PPM tolerances will lower on this.Is this usual, and do different manufacturers uses tight / sloppier specs on their crystals?Does anyone else have experience of this?

author: ataradov
author_rank: Super Contributor
timestamp: February 25, 2016, 07:57:18 am
content: What exactly you were measuring?

author: Howardlong
author_rank: Super Contributor
timestamp: February 25, 2016, 08:33:24 am
content: How are you measuring this, with the DVM counter option? Is it a 3054Aor 3054T?From the X3000ADS:Time base accuracy 25 ppm ± 5 ppm per year (aging)Specifications are valid after a 30-minute warm-up period and ±10 °C from firmware calibration temperature.From the X3000TDS:Time base accuracy 1 ±1.6 ppm + aging factor (1st year: ±0.5 ppm, 2nd year: ±0.7 ppm, 5 years: ±1.5 ppm, 10 years: ±2.0 ppm)Specifications are valid after a 30-minute warm-up period and ± 10 °C from firmware calibration temperature.

author: AndyP
author_rank: Contributor
timestamp: February 25, 2016, 01:55:13 pm
content: Thanks Howard,It's a MSO-X3034A so 17ppm puts the ppm error will within the 25ppm specification.The measurement was used to verify the timing accuracy of a xtal / pll combination, with pulses every 100ms period which resulted in a 1.7us offset from the expected time after 0.1 secconds, when measured on the Keysight 'scope. This offset was not due to the xtal/pll combo but the 'scope ppm error, as verified by other test equipment.The R&S RTM2054 is which is the other option we had is +/- 2.5ppm, which may have been sufficient for the testing we are doing.

author: alanambrose
author_rank: Frequent Contributor
timestamp: February 25, 2016, 11:51:41 pm
content: If I remember rightly, the previous generation had a 10MHz ref input - that's progress for you.A.

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: February 29, 2016, 05:49:30 pm
content: The 4000 X-Series and up have the 10 MHz reference input. With the ppm spec on the 3000T, not so much of a concern, though (for most applications).
Should I let go of my Agilent now that I have a Siglent that also does the job? - Page 1
Forum section: electronics / testgear

author: testmode
author_rank: Regular Contributor
timestamp: February 29, 2016, 01:17:59 am
content: I recently got a Siglent SDG2082X and now I am contemplating whether I should let go of my Agilent 33521A. I don't use my equipment professionally so I sort of feel bad having 2 AWGs laying in my bench when one would perfectly suffice. And probably with the proceeds of the Agilent, I would be able to get some additional stuff for the bench like a better power suppply and/or a programmable load.But at the same time, I don't want to let go of the Agilent because well, it is an Agilent. The Siglent is good and it does the job (plus it's dual channel) but there is just something about the Agilent that gives you that feeling of trust and reliability.If you were in my situation, would you let go of the Agilent or hold on to it?

author: romantronixlab
author_rank: Regular Contributor
timestamp: February 29, 2016, 01:23:07 am
content: If it where me, I would just keep them both, like in almost all fields there are never too much of anything. Besides more channels are available.

author: TheSteve
author_rank: Unknown
timestamp: February 29, 2016, 02:19:27 am
content: I'd keep the Agilent 100 times over before keeping the Siglent - *unless* selling the Agilent will allow you to purchase some other gear you really want that the Siglent can't pay for.

author: uncle_bob
author_rank: Unknown
timestamp: February 29, 2016, 02:20:20 am
content: HiI'd say it's a bit early in the Siglent's life to dump the HP. Like you, I have a 2082X, they still have a few things to work out before it's rough edges are all taken care of. That's not a knock, it's a new instrument. We'll see how good it really is after they have a year or so to fix this or that. If the fixes work and they all are firmware based, it could be a great gizmo.Bob

author: TAMHAN
author_rank: Frequent Contributor
timestamp: February 29, 2016, 02:57:13 am
content: To be honest, and on the risk of a beating. I was the one wanting the 33125 (the one with the Noritake VFD), while SWIMBO was pushing for the TEK AWG2021.After I was able to handle the HP at a friends for a few minutes, I owe the hiss a beer. I found the VFD menu of the HP unbearable compared to the svelte CRT display of the Tek...but that, ofc, is a question of taste.Re selling gear. It always is a sad moment having to say goodbye tho. So if you want to keep the unit and dont need the green (and have space), hold on to it by all means.Tam
Possible Website Idea for Test Equipment database and comparison - Page 1
Forum section: electronics / testgear

author: MikeDombo
author_rank: Unknown
timestamp: February 29, 2016, 01:01:28 am
content: Hello,I've been thinking that I want to make a website to offer spec comparisons of all sorts of ee test equipment. A user would be able to select multiple products for comparison of ranges, resolution, stability, accuracy, temp co, etc.So I'm writing here to ask if anyone else has an interest in having such a website for the community. Since descriptions, details, and specifications can often be quite hard to find, I believe having this website with crowd-sourced information would be fantastic. In addition to listing specs and such it would be great to see reasonable prices to pay for the used equipment based on actual past purchase prices.Thanks for reading all the way through, let me know if you are interested in this and perhaps I'll work on it over my spring break which is coming up next week.

author: HAL-42b
author_rank: Frequent Contributor
timestamp: February 29, 2016, 01:04:45 am
content: It could be interesting as long as it heats up the competition.

author: testmode
author_rank: Regular Contributor
timestamp: February 29, 2016, 01:28:38 am
content: Sounds good! You get my vote for it. Though, keeping the data relevant and always up-to-date would be a primary challenge.

author: tautech
author_rank: Super Contributor
timestamp: February 29, 2016, 01:45:43 am
content: Do you mean like:https://www.eevblog.com/forum/testgear/digital-oscilloscope-comparison-chart/https://www.eevblog.com/forum/testgear/multimeter-spreadsheet/Or like a recent member started:http://www.oscopes.info/Monumental task, good luck.

author: MikeDombo
author_rank: Unknown
timestamp: February 29, 2016, 01:48:27 am
content: Quote from: testmode on February 29, 2016, 01:28:38 amI'm thinking that it will be mostly for vintage items, although there is no reason why it can't have modern devices as well. And ideally the community would contribute so it isn't just me or any single person.Quote from: tautech on February 29, 2016, 01:45:43 amSimilar to those, but with a nice interface and easier comparison function. I'd also like it to contain reasonable prices to pay, not just specs. It could also show common failure modes and remedies.