hybridfree/eevblog-posts huggingface dataset:
Sampling heads - Page 1
Forum section: electronics / testgear

author: cmjones01
author_rank: Contributor
timestamp: June 26, 2018, 09:15:07 pm
content: Test equipment fans,Does anyone have any suggestions for easily available, affordable sampling heads to experiment with? Or indeed any going spare? I ask because I'm getting a Soviet oscilloscope sampling system working (see separate thread recently) and I have the Я4С-101 timebase and Я4С-100 Y amplifiers working but am missing the actual sampling head itself. Original sampling heads ('stroboscopic mixer' or смеситель стробоскопический) are as rare as unicorn fur.I have Tektronix SD-24 and SD-22 sampling heads which I use with my CSA803A scope, but they're a bit too precious to mess about with, and the pinout of their connector doesn't seem to be documented anywhere that I can find.Something like the Tektronix S-4 would be a good start, but did any other manufacturers produce anything similar, perhaps less sought-after? I don't care about the brand name but a risetime of <100ps would be nice.One wrinkle is that the connection to the sampling head only has +/-15V available, so anything involving avalanche transistors is a bit tricky.I attach a picture of the original sampling heads just for entertainment value.Chris

author: David Hess
author_rank: Super Contributor
timestamp: June 27, 2018, 07:46:51 am
content: The Tektronix S-1 and S-2 sampling heads are mostly through hole construction without any ICs or hybrids so they are a good place to start.

author: cmjones01
author_rank: Contributor
timestamp: June 27, 2018, 12:21:44 pm
content: The S-2, especially, looks promising, thank you. I'll keep a look out for one.Chris
Nice 'scope probe ground clips - Page 1
Forum section: electronics / testgear

author: Dielectric
author_rank: Regular Contributor
timestamp: June 25, 2018, 02:07:15 pm
content: I used a set of probes at a customer a few months ago that were really nice. Instead of the junky alligator clips on the ground leads, they had more of a fine point serrated pliers jaw. It made for a nice low profile and was very secure. Unfortunately I couldn't find a maker mark on them. Has anyone seen this before, and more importantly, where can I buy like a dozen of those nice ground leads? My googling and searching around at Pomona and Probemaster are turning up nothing.

author: iainwhite
author_rank: Unknown
timestamp: June 25, 2018, 03:32:53 pm
content: Anything like these?https://www.tequipment.net/Wayne-Kerr/1EVA40100/Kelvin-Clips/

author: David Hess
author_rank: Super Contributor
timestamp: June 25, 2018, 10:38:09 pm
content: Tektronix had some nice ground clips on the probes for their early TDS oscilloscopes. These "micrograbber" test clips from Pomona are similar if not identical but are pretty expensive:https://www.mouser.com/Test-Measurement/Test-Equipment-Accessories/Test-Clips/_/N-7uqds?P=1yzoblf

author: Fred27
author_rank: Unknown
timestamp: June 26, 2018, 01:09:53 pm
content: The Rohde and Schwarz 500MHz passive probes that come with the RTM3004 have similar fine pitch ground clips. No idea if all probes in their range are the same.

author: Dielectric
author_rank: Regular Contributor
timestamp: June 26, 2018, 06:31:02 pm
content: Ah-ha! There they are, with the high voltage probes (RT-ZH10, etc):https://cdn.rohde-schwarz.com/pws/product/p_1/probes/high_voltage_probes/Digital-Oscilloscope-High-Voltage-Probe-RT-ZH10-Passiv-Probe_03_w640_hX.jpgThey're the smaller clips, top-right. Now to find a part number...

author: thals
author_rank: Contributor
timestamp: June 27, 2018, 09:27:30 am
content: Clip looks like Hirschmann / SKS MA 1.Datasheet:https://www.distrelec.at/Web/Downloads/81/xx/MA_1_Crimp_9303181xx.pdfMaybe just exchange the clip from those crappy leads...
Hantek 6254BD with background noise - Page 1
Forum section: electronics / testgear

author: wolferl1210
author_rank: Contributor
timestamp: June 10, 2018, 05:19:28 pm
content: Hi all,received the new Hantek 6254BD last saturday, ordered at Aliexpress.Unfortunately the device is not useable at all. There is constant background noiseon all channels shown and can be measured. Does not matter if the input connectoris completely open or directly grounded with an BNC connector.Did the self-calibration routine several times - no change.open input, setting at 20mV shows 17.6mVolt background noiseopen input, setting at 500mV shows 31.4mVolt background noiseopen input, setting at 5V shows 314mVolt background noiseConnected the scope with the probe to the probe compensation connector,(probe was set to 1:10) shows the noise in the squarewave too. See pictures attached!Is this a design problem or is the unit faulty ? (OK, OK, or some would say: "it's a toy...")greetingswolderl

author: doobs
author_rank: Newbie
timestamp: June 26, 2018, 02:29:45 am
content: Quote from: wolferl1210 on June 10, 2018, 05:19:28 pmDoes seem to be quite noisy, but I guess you found the 128x averaging switch?Then the noise pretty well disappears.I have noticed that sometimes the calibration doesn't complete unless I do a factory reset first.Sometimes I've had to power it down and restart it because its signals were so distorted, but I was never really sure if it was the scope, or the FeelTech signal generator I was driving it with.good luck
DSA815 Downgrade possible? - Page 1
Forum section: electronics / testgear

author: 0xFFFF
author_rank: Contributor
timestamp: June 26, 2018, 01:12:18 am
content: I have the DSA815-TG. It is a great unit and I have all of the trial periods counting down (excluding TG of course).From what research I've done, I am of the understanding that there are a few options to keep these trial counters running indefinitely. Is this correct?I also happen to have the 00.01.03d firmware. Can I force a downgrade?If so, how?I hope I'm not asking a question that has already been answered but....TIA
High speed ADC and DAC overclocking: Who does it? - Page 1
Forum section: electronics / testgear

author: Scratch.HTF
author_rank: Regular Contributor
timestamp: June 25, 2018, 09:04:08 am
content: In test equipment, I have seen high speed ADCs and DACs being overclocked which includes the FeelTech FY6600 arbitrary waveform generator (250 MSPS with a DAC904 powered by +3.3V having a maximum rate of 165 MSPS @ +3.3V).But in a Hantek DSO3000A (1 GSPS), there is no evidence that the ADC (HMCAD1511) is overclocked but the waveform generator DAC (DAC902 powered by 3.3V) might be; in the Hantek HDG2000 (250 MSPS with an AD9747), there is no evidence of overclocking.So therefore, I am curious about other test equipment manufacturers (and models thereof) who overclock high speed ADCs and DACs.
Rigol DS1054Z firmware - Page 1
Forum section: electronics / testgear

author: rtky
author_rank: Newbie
timestamp: February 19, 2017, 06:41:23 am
content: Hi All,My first post here.I bought Rigol DS1054Z just few days ago and slowly exploring all functions.I was confused with one thing though. I was looking online for latest firmware version number for this device. The official website (https://www.rigolna.com/products/digital-oscilloscopes/1000z/) has version 04.03. But my device has already 04.04.Well, I guess that's ok, though I wonder if I'm missing anything??It is surprising that latest version was not on the web. Also that website is not very specific, does not list version, you have to download/unzip it to find out what version it is. I could not find any other place with firmware.Comments appreciated.Rob(BTW, unlocking still works fine with DSER option code)

author: MarkF
author_rank: Super Contributor
timestamp: February 19, 2017, 07:24:21 am
content: This is where Rigol told me to get the firmware.http://beyondmeasure.rigoltech.com/acton/fs/blocks/showLandingPage/a/1579/p/p-0019/t/page/fm/0A newer version was briefly provided but taken down because some people were having problems installing it. We're expecting a new version any time hopefully....

author: rtky
author_rank: Newbie
timestamp: February 19, 2017, 07:44:24 am
content: Thanks Mark

author: glitch
author_rank: Newbie
timestamp: June 25, 2018, 03:19:53 am
content: Since this page is high in google search results, I'll give an update: the official download page (the first post) has newer firmware.Click "downloads", then it wants you to fill out a short form. The newest version is currently v00.04.04.03.05 2018/04/28.

author: Fungus
author_rank: Super Contributor
timestamp: June 25, 2018, 04:01:55 am
content: Quote from: glitch on June 25, 2018, 03:19:53 amnb. You can put garbage in all the input fields and it still downloads.Or avoid the form and get it here:http://beyondmeasure.rigoltech.com/acton/fs/blocks/showLandingPage/a/1579/p/p-0019/t/page/fm/0

author: tv84
author_rank: Super Contributor
timestamp: June 25, 2018, 08:17:01 am
content: Or here:https://www.eevblog.com/forum/testgear/new-firmware-ds1000z-00-04-04-03-05-2018-05-09-(2018-02-28)/msg1544420/#msg1544420with the "pluses" corrected.
ADMIN: The missing RTB2004 thread - Page 1
Forum section: electronics / testgear

author: EEVblog
author_rank: Unknown
timestamp: June 25, 2018, 01:00:27 am
content: Yes the big "new killer scope in town" RTB2004 thread is gone, sorry to say accidentally deleted when a user account was removed. The systemshouldn'thave done this, but it did, and I don't know why, maybe a bug of some sort.I am currently unable to restore it, but I'm working on it. The posts are all still there, but the thread restore function isn't working, so they are kinda in limbo land I guess.Just wanted to let people know there wasn't a reason to delete this thread.

author: EEVblog
author_rank: Unknown
timestamp: June 25, 2018, 04:16:04 am
content: Fixed, the thread is now back

author: nctnico
author_rank: Super Contributor
timestamp: June 25, 2018, 09:10:57 am
content: It seems Flinstone got deleted

author: tautech
author_rank: Super Contributor
timestamp: June 25, 2018, 09:16:08 am
content: Quote from: nctnico on June 25, 2018, 09:10:57 amHe had 3 accounts and got banned.BTW, Dave, were they all in regular usage ?Could any have been from a long while back and not used like say a PW was lost so another A/c was started ?
DIY Network & LAN Cable Tester? - Page 1
Forum section: electronics / testgear

author: ricktendo
author_rank: Regular Contributor
timestamp: June 24, 2018, 08:40:23 pm
content: Wonder if anybody know there is a DIY Network Cable Tester out there, something similar to these testerseBay auction: #261822600212eBay auction: #252711580056eBay auction: #292500127300Currently I have a really cheap one and looking for a better one than thiseBay auction: #361159538428

author: BradC
author_rank: Super Contributor
timestamp: June 25, 2018, 02:09:58 am
content: Quote from: ricktendo on June 24, 2018, 08:40:23 pmI have a slightly earlier revision of these (actually I have 2, the first was DOA so they sent a new one and while that was arriving I replaced the broken 0805 resistor in the first). They are actually really quite good.Do a good job at making clear you've crossed a wire, the TDR is great for fault finding as it gives you a good indicator as to how far away the fault is (my end of the cable or the far end?) and the little squeaker in the remote dongle makes identifying pretty easy. Actually, the TDR has come in handy heaps. Need to replace a cable in an unknown/undocumented pit system? Just whack this across it and get a length estimate to see if you have enough in the van or need a bigger drum.The built in F-set does a credible job too. I paid about $35USD for mine. The local electronics shop has the same thing listed for a couple of hundred bucks. It's not worth that though.I do wish I'd bought the one with 8 dongles though. Maybe next time. Recommend A++ would buy again.
50 pounds DMM from Russia - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: June 23, 2018, 12:10:53 pm
content: I found this on the ad siteThe DMM thatweighs50 pounds

author: wraper
author_rank: Unknown
timestamp: June 23, 2018, 12:32:39 pm
content: You're wrong, it weights only 9kg = 20lb

author: Cubdriver
author_rank: Unknown
timestamp: June 24, 2018, 03:15:50 am
content: Here's one that weighs 48 lbs (22 kilos), and measures DC Voltage...Oh, and frequency, too, to either 300kHz or 1.2MHz, depending on options.If you want to measure AC or resistance, that's another box, nearly the same size as the meter (meter is 19 x 7 x 18-3/8"; same height and width butonly17-1/4" deep for the AC/Ohms unit) that's a svelte 43 lbs (19.4 kg) that plugs into it.You've gotta love old test gear!!-Pat

author: radiolistener
author_rank: Super Contributor
timestamp: June 24, 2018, 05:12:32 am
content: Quote from: Cubdriver on June 24, 2018, 03:15:50 amSo warm and beautiful digits...

author: TimFox
author_rank: Super Contributor
timestamp: June 24, 2018, 02:02:25 pm
content: Dymec was Hewlett-Packard's brand for industrial automation-type stuff. Note that if you turn "-dy-" 180 degrees, it reads "-hp-".
Rigol DS1054Z resets to factory defaults after reboot - Page 1
Forum section: electronics / testgear

author: thomathy666
author_rank: Newbie
timestamp: June 24, 2018, 03:10:59 pm
content: Hi there,thanks to the information found on the forum, I decided to buy a Rigol DS1054Z as my first oscilloscope. For the first few months, it worked absolutely fine, but since today, I have an annoying problem.Every time I boot the thing, the settings completely reset. Under Utility --> Power Set, the setting is set to "last", as should be, but it seems having no effect. I also tried setting it to "default" and then back to "last", but it didn't solve the issue.Does anyone have an idea what could be wrong with the machine?-Thanks-

author: Fungus
author_rank: Super Contributor
timestamp: June 24, 2018, 04:23:29 pm
content: Try doing a complete factory reset - hold down the fifth menu button on the left hand side while you power it on.If that doesn't fix it then it might not be a software problem.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: June 24, 2018, 05:19:06 pm
content: This is a new one on me. The above covers what I would have suggested too.A couple of questions:1. When the scope resets itself, does it come up in Chinese? It should come up in Chinese using the Magic Button, but I'm asking about the original symptom on power-on with no buttons pushed.2. What firmware version are you running? (From the complete System Info screen accessed by the Trigger Menu-Menu-Force-Menu trick)If you are running an older firmware you might try upgrading to the latest version.Other than that...

author: thomathy666
author_rank: Newbie
timestamp: June 24, 2018, 05:47:25 pm
content: Thanks for your suggestions!@Fungus:Unfortunately, the complete factory reset using the button combination did not work out.@alsetalokin40171. When the scope boots with no buttons pushed, the preselected language is Chinese.2. The software version is 00.04.04.SP3 (00.04.04.03.02), Board Version is 0.1.4, Boot Version is 0.0.1.4, Firmware Version is 0.2.3.11, CLPD Version is 1.1

author: Fungus
author_rank: Super Contributor
timestamp: June 24, 2018, 05:54:45 pm
content: Quote from: thomathy666 on June 24, 2018, 05:47:25 pmEvery single time?In that case you could be looking at the flash memory chip that stores the settings. Maybe a bad solder joint... easy to fix if so.Or, depending on where you purchased it, it's probably under warranty. Find out how much trouble it is to send it back before doing anything else.

author: thomathy666
author_rank: Newbie
timestamp: June 24, 2018, 06:01:26 pm
content: Yes, every single time.Cool, thanks for locating the issue! You helped me out a lot. Since my device is still under warranty, I will not solder it myself (although I'd like to do it), but rather send it back to the seller.I'll post again if I get told if it was in fact the flash memory solder joint or anything else.Cheers!

author: Fungus
author_rank: Super Contributor
timestamp: June 24, 2018, 06:15:50 pm
content: Quote from: thomathy666 on June 24, 2018, 06:01:26 pmIn that case it's not storing any settings at all. It's definitely not because you configured it wrong.
Rigol DP832 alternative? - Page 1
Forum section: electronics / testgear

author: sstepane
author_rank: Regular Contributor
timestamp: June 23, 2018, 04:16:54 pm
content: Hi,Have been using DP832 for some time and starting to wonder, is there any alternative to this PSU with the following mandatory features:- 3 independent channels- at least 3 Amps- back plate connectors with SENSE- monitoring function analogue (ability to set some current that when reached the unit will beep)!- more-less decent displaySearched a bit, but have found none for these functions. Closest are R&S HMC/HMP but these do not have monitoring function, only fuse/switch off.Might be Keysight with firmware updates, but its manual does not indicate such a function (which is odd, it is so easy to implement, yet no one has done it except Rigol).I would upgrade, since DP832 have several bugs/shortcomings.

author: maginnovision
author_rank: Super Contributor
timestamp: June 23, 2018, 10:50:39 pm
content: Best bet is probably the AimTTI MX100T.
Data Precision Nixie DMM – manual and identification of power lead please! - Page 1
Forum section: electronics / testgear

author: Chris56000
author_rank: Frequent Contributor
timestamp: May 05, 2018, 04:47:19 pm
content: Hi!Can any of our knowledgeable US Gurus identify this power I/p connector on this Nixie DMM for me, and point me in the direction of a instruction/maintainance manual for it please?Chris Williams

author: factory
author_rank: Super Contributor
timestamp: May 05, 2018, 05:06:21 pm
content: Quote from: Chris56000 on May 05, 2018, 04:47:19 pmNot sure anyone can help without knowing the model number of the meter, also a picture of the connector you want identifying would help.David

author: Chris56000
author_rank: Frequent Contributor
timestamp: May 05, 2018, 08:22:48 pm
content: Hi!My apologies – I thought I'd attached piccies to my query but it looks like they went walkabouts!I'll retake the pictures and add them to my post!Chris Williams

author: tropicalSpeed
author_rank: Newbie
timestamp: June 12, 2018, 02:04:21 pm
content: Hi Chris,I just purchased a Data Precision DMM with the I/O connector on the rear of the unit. Mine is a Model 2440,Did you have any luck finding a manual? If you do, could you please share it with me?Thanks.

author: factory
author_rank: Super Contributor
timestamp: June 23, 2018, 08:27:06 pm
content: Quote from: Chris56000 on May 05, 2018, 08:22:48 pmIf it looks like the in the picture posted by tropicalSpeed then it's one of the Belden, Volex & Alpha round pin power cords with the oval PH163 connector, these turn up regularly on ebay in the US both new & used, it seems they were also used on some audio equipment too.I did see some in Germany but can't find them now (probably just as expensive as the ones in the USA).Also Sphere have new ones at this page, scroll down the page to find them:http://www.sphere.bc.ca/test/hp1.htmlI bought a couple from them a few years ago.I know the polarity of the live & neutral pins is reversed on the cables used for HP equipment, not sure about other test equipment brands, information on the second page of the attached pdf.David
Regulated DC power supply. Atten APS3003S-3D - Page 1
Forum section: electronics / testgear

author: Bobo
author_rank: Newbie
timestamp: June 22, 2018, 07:57:59 pm
content: Hi everybody,First of all, I know that I'm on one of the biggest electronic forum but english is a foreign language for me and is not as good as I would like. However practice is a source of progress and I would welcome if some people want to correct my mistakes.I recently buy some electronic stuff (arduino, soldering iron, some basic electronis components, etc. ). I would like to get some more equipment with an oscilloscope (certainly the Rigol DS1054z) and a Regulated Dc power supply that is the main subject of this topic. I found this one that is :https://www.polytech-oscilloscopes.com/alimentation-dc-triple-aps3003-3d-281079.htmlThe triple current source will help me to have +-15 V supply that could be current limited and an additional 5V source.The specs are presented in the pdf file in attachments, I do believe that it is a good deal but I would have some of your comments before buying it. What do you think about this power supply ?Thank you very much for your help,Bobo

author: tautech
author_rank: Super Contributor
timestamp: June 22, 2018, 10:26:29 pm
content: Welcome to the forum.Yes that PSU is cheap for what it is.The layout reminds me of some old Siglent PSU units and I wouldn't be at all surprised if the PCB inside had Siglent on it as they've made lots of Atten products in the past.For the $, I'd take the chance on that one.
Keysight BenchVue - Page 1
Forum section: electronics / testgear

author: ddcc
author_rank: Regular Contributor
timestamp: June 25, 2018, 10:16:56 am
content: Perhaps I missed a change in licensing policy, but the basic version (non pro) of all the apps in BenchVue appear to be free now:https://www.keysight.com/us/en/software/application-sw/benchvue-software.html#Bundles

author: LaurentR
author_rank: Frequent Contributor
timestamp: June 25, 2018, 04:35:05 pm
content: There haven't been "pro" versions for most instruments in a while (since they discontinued the basic "free" version).Looking around the web site in the instruments pages directly, all these seem to be $0 right now except for a few (the remaining "pro" versions for USB instruments and a couple of other ones).It would be good to know if it's a mistake or some new policy (Benchvue's licensing scheme seems to change every year or so, so it wouldn't be surprising if it changed again).

author: iainwhite
author_rank: Unknown
timestamp: June 25, 2018, 05:22:31 pm
content: I put in an order for the BV9001B BenchVue Complete Control Collection for $0.I will let you know how it turns out.

author: nfmax
author_rank: Super Contributor
timestamp: June 25, 2018, 05:47:20 pm
content: Am I missing something? All I see is 'free trial' except for the platform & the USB device applications.

author: LaurentR
author_rank: Frequent Contributor
timestamp: June 25, 2018, 06:53:30 pm
content: I guess not:"Thank you for choosing Keysight Technologies for your product needs.Your order for Benchvue software has been received. We were experiencing some technical difficulties at the time of your purchase and pricing was not reflected accurately on order confirmation. The price for your requested purchase is USD $2,173.13. If you wish to proceed or cancel your purchase at this pricing please let us know at your earliest convenience. "

author: ddcc
author_rank: Regular Contributor
timestamp: June 25, 2018, 06:54:54 pm
content: Many of the applications were listed as "$0".I also put in an order. Unfortunately, I got an email stating that their ordering system is having problems, and the actual price of the BV9001B is $2173.13.

author: iainwhite
author_rank: Unknown
timestamp: June 26, 2018, 02:22:09 am
content: Me too:• Net $ Amount incorrect - Pricing for Benchvue software is not loading on Keysight.com. Please see the attached quote and respond to this message to indicate if you would like to proceed with the order in the amount of $1,671.64 + applicable taxes
old test equipment clearout, California - Page 1
Forum section: electronics / testgear

author: Chris Jones
author_rank: Regular Contributor
timestamp: June 22, 2018, 12:29:03 am
content: This is nothing to do with me but I noticed this post on usenet:https://groups.google.com/forum/#!topic/sci.electronics.design/jgDZ6GsIjME"We are moving the company in August (if PG&E finally gives us power)and I have a lot of old test equipment that I'd like to get rid of.Tek, HP, GR, all sorts of stuff. And a zillion manuals and oldcatalogs.I figured that I'd spread the stuff out and photograph it all and seeif anybody wants any of it. I'd hate to have it all hauled out tolandfills.If you are interested, email me and in a month or so I'll send you thepics.jjlarkinhighlandtechnologycom"
Black Star Nova 200 Frequency Counter - Page 1
Forum section: electronics / testgear

author: 2E0KKQ
author_rank: Newbie
timestamp: June 21, 2018, 03:29:58 pm
content: Hello, I've recently purchased a Nova 200 frequency counter and curious if anyone is familiar with its first power on state.When I turn it on all the LCD zeros flash up then go off until the first gate loop starts. I wondering if this is normal?I have replaced all the electrolytic caps and 3 tantalums thinking they could be the issue.When I first received the counter it wasn't doing this, then after a day or two it started ,so naturally thought the caps could be at fault.All the capacitors replaced and any possible dry solder joints have been reworked.Any ideas or even if this is common on other counters. I just hope an IC isn't about to fail!Will
Siglent SDS1000Cxx series - BW upgradable via license? - Page 1
Forum section: electronics / testgear

author: tv84
author_rank: Super Contributor
timestamp: June 20, 2018, 04:16:16 pm
content: Can the Siglent SDS1000Cxx several series be upgraded via the GUI with a license?SDS1000C Series,SDS1000CE Series,SDS1000CM Series,SDS1000CN Series,SDS1000D Series,SDS1000CF Series,SDS1000CFL Series.Options or bandwidth?

author: rf-loop
author_rank: Super Contributor
timestamp: June 20, 2018, 05:03:36 pm
content: Quote from: tv84 on June 20, 2018, 04:16:16 pmNA

author: tv84
author_rank: Super Contributor
timestamp: June 20, 2018, 08:08:18 pm
content: Quote from: rf-loop on June 20, 2018, 05:03:36 pmAssuming that you are meaning "Not Applicable", I ask then about the + Models, namely DL+ and CML+?I'm pretty sure they have a "manual_input_license" and I may be able to help anyone who wants to upgrade his oldie, if the option is visible. If not visible, with a little additional effort...

author: tautech
author_rank: Super Contributor
timestamp: June 20, 2018, 09:35:35 pm
content: Pre Plus models only had I/O's of USB and IIRC RS-232 so Telnet'ing into them would be difficult.Only the newer DL+, CNL+, CML+ and CML models have LAN connectivity.Anything before these would require some padded/tweaked USB script.
Test equipment brands in movies - Page 1
Forum section: electronics / testgear

author: Scratch.HTF
author_rank: Regular Contributor
timestamp: June 23, 2018, 08:07:33 am
content: The Brandspotters website mentions that Rohde & Schwarz was depicted in the movie "Johnny Mnemonic", and I have seen Tektronix test equipment depicted in "Face/Off" (also mentioned in the credits) and early in "The Core".What I am really wanting to find out is what movie(s) LeCroy test equipment is depicted in - do you know of any other movies where test equipment brands e.g. Agilent/Keysight were depicted?If we know where to look for, we might even see Chinese test equipment brands such as Hantek and Rigol in movies...

author: tautech
author_rank: Super Contributor
timestamp: June 23, 2018, 08:29:07 am
content: There was another thread about this recently:https://www.eevblog.com/forum/chat/movie-scopes-(and-other-tm-props)/
Lecroy WaveRunner 104MXi - Strange behaviour on CH1 & 2... - Page 1
Forum section: electronics / testgear

author: darkstar49
author_rank: Frequent Contributor
timestamp: June 19, 2018, 09:59:10 pm
content: Anyone ever saw this ?? Got it only on CH1 & 2, 3 & 4 are OK.If anyone has hints/ideas, they're welcome !!https://youtu.be/dwMPp9JilgI

author: tautech
author_rank: Super Contributor
timestamp: June 19, 2018, 10:05:50 pm
content: Vdig and Idig seem like measurement thresholds of some kind. Decode or just Measurements is what I'd suspect.Can you do a set to Default and get rid of them ?

author: darkstar49
author_rank: Frequent Contributor
timestamp: June 20, 2018, 12:20:44 am
content: Nope... that’s somehow my problem...Cursors are all off, as well as all measurements... and this is mentioned absolutely nowhere...My fear is that some values are above acceptable thresholds, and that this is the reason these are shown... ?I’ll try to get in touch with Lecroy also...

author: kilobyte
author_rank: Regular Contributor
timestamp: June 20, 2018, 08:33:35 am
content: Hi,I watched the Video, but i'm not really sure what strange behavior you are seeing here.Do you mean the Labels IDIG / VDIG?These are Labels that can normaly be enabled in the Channel Setup, see the attached picture.BRKai

author: darkstar49
author_rank: Frequent Contributor
timestamp: June 20, 2018, 09:28:21 am
content: If that's it, you've earned a bottle champaign !!! (serious !)And I should probably be ashamed for the next 10 years...It's probably a shame, but I NEVER EVER used labels...Will let you know when I'm back home...
121GW - Frequency measurement inrush current - Page 1
Forum section: electronics / testgear

author: final
author_rank: Newbie
timestamp: June 18, 2018, 06:55:52 pm
content: Hi,I just received my 121GW about three hours ago. First off: very nice that it comes with batteries and a 8GB microSD preinstalled. I'm sure everybody but me was aware of that, but I was pleasantly surprised. I updated my firmware to 1.21 without issues. So far I'm very happy with the meter.Since I didn't have a circuit lying around, I figured I'd play with the circuit that's always available - mains voltage! For the record, I live in Europe, so we're talking 230VAC @ 50Hz.I plugged in the meter and measured some voltages and frequency and checked that it doesn't blow up on bad settings and so on and all of a sudden, I hear a "clack" and I'm in the dark. Turns out that my 10mA RCD had triggered while measuring frequency against ground. I thought this was very interesting, so I took out every meter that I own and checked if they'd trigger the RCD as well while measuring frequency. Here are the results:EEVBlog 121GW: yesBrymen BM235: noVoltcraft VC890: yesSanwa PM300: noVoltcraft VC-540: yesSiglent SDM3055: noFunnily enough, no meters triggers the RCD when measuring voltage, despite all three who do trigger the RCD when measuring frequency have the frequency on the secondary display when measuring voltage!I thought this was quite interesting, so I went on and tried a 30mA RCD. Here, only the 121GW managed to trigger the RCD. Lastly, I hooked up two multi meters in a row, one (Voltcraft VC890) measuring current and the 121GW measuring frequency behind the VC890. It's not a very precise result, but the VC890 showed as much as 60mA current flowing initially when doing frequency measurement. This seems to behave like a kind of inrush current, as the current drops very quickly to 2-3mA. I was too lazy to bring out the oscilloscope with a shunt or a multi meter peak measurement (not sure if they work with current anyway).Still, I find it very interesting that those meters behave quite differently and draw a significant amount of current when measuring frequency, even if only for a short period of time. But 230VAC * 60mA is roughly 14W! So there's serious power flowing through your meter when measuring frequency.I have no idea how a multimeter actually measures frequency and whether such inrush currents are normal (I guess they are). Does anyone like to enlighten me?Best,final

author: HKJ
author_rank: Super Contributor
timestamp: June 18, 2018, 07:58:43 pm
content: Many multimeters have low input impedance on frequency input with higher input voltage:You can see a curve here from my UNI-T UT195DS review (This is typical for most meters):

author: genghisnico13
author_rank: Regular Contributor
timestamp: June 20, 2018, 01:12:24 am
content: It's a nice feature, you can test RCDs/GFCI with it.
FA-95 miniature drive belt for Wayne Kerr SR268 Source - Page 1
Forum section: electronics / testgear

author: pamphonica
author_rank: Regular Contributor
timestamp: May 23, 2018, 06:31:51 pm
content: I need a "PIC FA-95" miniature belt to complete the restoration of my Wayne Kerr SR268 Bridge source.The belt in my SR268 has completely disintegrated, except for a small portion which amazingly has the belt type printed on it. It drives the switch for the many range lamps.I can find the PIC Design website and the actual belt. It's in their "No-Slip" series. But they quote 96 days lead-time (apart from the extra $20 handling charge for a small order).The belt is not a conventional ribbed one, but has pins sticking out sideways from a central core, a bit like a fishbone. The belt is 9.327" long and has 95 drive pins.(See attachment for details)A long shot but does anyone know where else I could get one of these belts, or something similar?many thanksJeremy(UK)

author: Gregg
author_rank: Super Contributor
timestamp: May 23, 2018, 07:15:46 pm
content: Wm Berg makes this type of thing in the US.http://www.wmberg.com/products/belts-and-chainsIt may get you started looking in a new direction

author: pamphonica
author_rank: Regular Contributor
timestamp: May 23, 2018, 09:27:42 pm
content: Good suggestion. Only a shame that their minimum order is $500!I’ll try more searches with their part number.I see that these belts can actually be cut to length and joined on site so I could just look for a large belt and see if I can modify it.

author: texaspyro
author_rank: Super Contributor
timestamp: May 24, 2018, 05:52:54 am
content: Try Stock Drive Products...

author: pamphonica
author_rank: Regular Contributor
timestamp: May 25, 2018, 11:42:26 am
content: Quote from: texaspyro on May 24, 2018, 05:52:54 amA very good idea! I checked and they seem to have what I want, at $15.10 a belt ($30 min order or $10 surcharge), so that little belt's going to be quite expensive by the time it finally gets to the UK. I may try to see if a US friend can bring it over in August, to save a bit.By the way, that's the belt with a steel core. The original had an Aramid core and is out of stock.thanksJeremy

author: konczm123
author_rank: Newbie
timestamp: June 19, 2018, 08:05:04 pm
content: Hi,Could you give me the exact part number? Have you tried your part bought from Stock Drive Products?Thanks and regards,Miklos
Do you know where we can find motor datasheet? - Page 1
Forum section: electronics / testgear

author: ocset
author_rank: Super Contributor
timestamp: June 19, 2018, 03:07:34 pm
content: Hello,We have a Constant temp and humidity oven of part number HZ-2004AIts Made by Li Xian.There are three fan motors on top of it.One has severely overheated and the attached CBB61, 5uF 450VAC capacitor has blown up.The motor nameplate says:-Cheeming, 51K90A-CF90w 220v 50/60hz 5uF 0.58A 1300/1600 r/minDo you know where we can find the motor datasheet so we can probe its windings to see if they have gone short?
How noisy is a Rigol DP832? - Page 1
Forum section: electronics / testgear

author: bd139
author_rank: Super Contributor
timestamp: June 18, 2018, 08:38:39 pm
content: Just lost a TTi PL310 supply due to a fault unfortunately. Getting fed up of arguing with old stuff so am looking at a Rigol DP832.How noisy is the fan on these? Already have a DS1054Z and DG1022Z so in terms of them would be good.

author: LaurentR
author_rank: Frequent Contributor
timestamp: June 18, 2018, 09:52:02 pm
content: The fan is thermally controlled and large, but still pretty noisy. IMHO, it's too loud for a home-office. Might be ok in a corporate lab. Noisier than a DS1000Z at idle I think, although with a lower pitch as the fan is larger.It's a great candidate for fan swapping (plenty of information on the forum).

author: bd139
author_rank: Super Contributor
timestamp: June 18, 2018, 09:54:02 pm
content: Screw that then. My bench is in the living room... thanks for the feedback. I don’t want to modify it.Managed to fix the thurlby supply by reseating connectors anyway.

author: tautech
author_rank: Super Contributor
timestamp: June 18, 2018, 10:26:54 pm
content: If you ever need a little cheap and pretty much indestructible PSU have a look at MCH-K305D.Fan cycles infrequently in ordinary bench usage and they're fairly quiet when it's on.One of the few threads on them:https://www.eevblog.com/forum/testgear/cheap-variable-switching-power-supply/Otherwise the SPD3303X-E's are pretty good ......and extremely quiet at low V/A settings.

author: bd139
author_rank: Super Contributor
timestamp: June 18, 2018, 10:57:39 pm
content: Absolutely cannot be a switching supply. This is driving RF gubbins. My specialist RF switcher is even too noisy (has noise offset control)SPD3303X-E looks possible. Will investigate that after I've had some kip. Thanks for the suggestion.

author: LaurentR
author_rank: Frequent Contributor
timestamp: June 19, 2018, 12:49:47 am
content: Not the same price range, but the new Keysight E36313A is essentially silent at idle/low load.

author: bd139
author_rank: Super Contributor
timestamp: June 19, 2018, 06:17:40 am
content: I did look at one of them but the one with three independent outputs is way more expensive than the baseline unit.

author: PTR_1275
author_rank: Frequent Contributor
timestamp: June 19, 2018, 06:46:42 am
content: Never noticed the noise of the DP832 on the bench at work. Lots of equipment running and kinda got used to the whir of fans.Bought another one for the home workshop / office and by Jesus I notice it now.Waiting for it to run out of warranty (few months left) and then I’ll change the fan over for a quieter one.I do like the TTi power supplies. As long as other staff members don’t put things on top completely covering the air holes, they last for a long time.

author: kwass
author_rank: Frequent Contributor
timestamp: June 19, 2018, 02:13:36 pm
content: For future reference the BK 1739 is linear and fanless and has roughly the same output specs as the PL310. Its list price is high but I got it on sale for under $200US on Amazon.
HP 410C VTVM vs. HP 412A VTVM - Page 1
Forum section: electronics / testgear

author: MonarkeIV
author_rank: Contributor
timestamp: June 18, 2018, 12:32:10 pm
content: Can anyone or several explain to me why the HP 410C's asking price seems to be significantly higher than a HP 412A?.Is it that "holy grail" following thing or is there something significant to it.Thanks
Wavetek RF sweeper : last on earth ? - Page 1
Forum section: electronics / testgear

author: outremer
author_rank: Contributor
timestamp: May 19, 2018, 09:38:52 pm
content: Hi all,I purchased recently a Wavetek RF sweeper model 8911 (was probably also manufatured by Gigaparts in the UK). The instrumentdid not power up when I first switched it on. I carefully disassembled it and put it together again. And miracle it works !.The instrument features 3 (three) YIG oscillators to cover the range from 10 MHz to 20 GHz, and some other microwave components whichare worth more than I paid for it.The manufacturing dates on the various components shows that the piece was probably put on the market in the very early 90s.The serial number is 329 and the total hours is 9998. Of course it needs some adjustments.The output is as (un)stable as a sweeper can provide. But I already tested some waveguide bandpass with it and it showed to be useful.Nevertheless I would be very happy if I coud find an owner's manual or better a service manual. But no luck : my research was not successful.It seems my 8911 is the last on earth.Is anyone a happy owner of the dinosaur, or maybe knows where to get some documents ?Regards

author: outremer
author_rank: Contributor
timestamp: June 18, 2018, 04:47:26 pm
content: The instrument also exists made by Marconi Instruments type 6311.Maybe that rings a bell.Regards,Phil FM5GB
hp 204d - Page 1
Forum section: electronics / testgear

author: diode702
author_rank: Newbie
timestamp: February 24, 2013, 12:16:35 am
content: Has anyone got experience with this 204d oscillator. I was give this 204d and a hp power supply 0 to 3o v at 3 amps and a tek 2235 scope. ive got the scope and the power supply working great but the 204d is giving me trouble. It was clean but dosenot work. After i finally got it apart i located the plus 13 and -13 power supply which was working ok but the unit has no output. I found a operator manual on the internet but no schematic or troublingshooting info. Does any one have a schematic or know where i can get one.thanks diode 702

author: amspire
author_rank: Super Contributor
timestamp: February 24, 2013, 12:42:02 am
content: The 204C manuals are here. Hopefully not too differenthttp://bama.edebris.com/manuals/hp/204c/

author: flash2b
author_rank: Regular Contributor
timestamp: June 17, 2018, 07:29:58 pm
content: I recently also acquired a HP204DOperating and Service manual for HP204C and HP204D models are here:https://elektrotanya.com/hp_204c-204d_sm.rar/download.html. On that site please wait till "processing" is turned into "download"However the power supply schematics are not in the Elektrotanya link, but gladfully they are part of the Bama link.
TTi MX180TP switching noise - Page 1
Forum section: electronics / testgear

author: dstahlke
author_rank: Newbie
timestamp: June 15, 2018, 03:51:37 am
content: Has anybody noticed any switching noise on the MX180TP? A review of the MX100TPhttps://www.eevblog.com/forum/testgear/tti-mx100tp-triple-power-supply-teardown-and-review/showed very little noise. But the attached picture is what I get from my 100x differential amplifier when it's just near the power supply, not plugged into it. This noise (inductively picked up?) was high enough to swamp anything actually coming out of the supply terminals.An interesting spec not in the datasheet: the capacitance to ground is 1.49uF, compared to 70nF for my BK 9129B.

author: maginnovision
author_rank: Super Contributor
timestamp: June 15, 2018, 03:40:46 pm
content: What do you get from the terminals with a load? It should be fairly low. I think these are primarily a switcher but feed a linear on the output to cut noise.

author: dstahlke
author_rank: Newbie
timestamp: June 17, 2018, 12:09:00 am
content: With a load, without a load, or with the differential probe terminals shorted to each other and not even connected to the supply, the result looks the same. I think this is EM radiation from the supply rather than noise on the terminals. In fact this radiated noise is so large I can't even begin to measure what's actually on the terminals. If the probe terminals are connected to ground the result is even worse. In that case there is an additional sinusoidal component at the same frequency, 100kHz. This is with a custom built probe based on the AD8421.

author: maginnovision
author_rank: Super Contributor
timestamp: June 17, 2018, 03:53:49 pm
content: Well you could always contact TTi. With custom probes I'm not even going to try and guess. When I sampled a 100mx I did not see that issue.
Generating clock signal on IFR 1200s  - Page 1
Forum section: electronics / testgear

author: leopoldocosta
author_rank: Newbie
timestamp: June 14, 2018, 07:36:11 pm
content: Greetings!I'm maintaining a Motorola MTR3000 Base Station Repeater. I've tested it for with every single troubleshooting available in Motorola detailed and basic service manual. Finally what is left is that i recalibrate it providing a clock reference to its SCM board.Anyway's, i've two service monitor: a HP 8920b and an IFR 1200s. As far as i know both generate signals, but only the 1200s is able to generate Motorola MTR3000 required signal wich is: 10Mhz with 3v peak-to-peak, sine or square wave.I'm having some difficulty with this 1200s, trying to generate the signal. A helpful tip would be welcome. Is anyone here used to operate this service monitor?

author: greg_s
author_rank: Newbie
timestamp: June 16, 2018, 08:32:59 am
content: Hi,the only way you can get the 10 MHz signal of the level you want is from the Ref BNC socket on the back panel. This connection can be an input or an output. Outputs a 10 MHz signal normally but will automatically switch when a 10 MHz external ref signal applied.Greg

author: TheSteve
author_rank: Unknown
timestamp: June 16, 2018, 08:50:23 am
content: My 8920B will generate 3 volts peak to peak @ 10 MHz out of the duplex port.
TEK 3034 CPU Failure - Page 1
Forum section: electronics / testgear

author: Old Printer
author_rank: Frequent Contributor
timestamp: June 15, 2018, 11:27:14 pm
content: I know of a Tek 3034 that appears to be in very nice shape, but is showing a CPU failure on bootup. The screen looks good, and it passes the other self diagnostic tests on that page - Acquisition, Display, Front Panel, I.O., ROM, Disc Drive and Application Modules. I have a couple older Tek analog scopes, a 475 & a 2225 but know little to nothing about their digital scopes. A quick look around ebay shows a complete motherboard from a 5054 for $325, not that I expect it to be interchangeable particularly, but it makes me wonder is it possible to pick up a scope like this, and with some persistence, luck and a few hundred bucks get it going?? Could someone familiar with this line of scopes chime in and share some insights. For instance I have read the 40+ multi page teardown thread on the 2465B in this forum, and with patience and the advice from others, that scope has changed from one that if the NVRAM chip died it was over, to one where work-arounds have been found. Anyway, I can get this scope for a couple hundred bucks, and the display looks good but for the CPU fail line. Any thoughts would be welcome.
Best bench PSU for ~250$/1000 PLN? - Page 1
Forum section: electronics / testgear

author: Osaka2407
author_rank: Newbie
timestamp: June 14, 2018, 11:04:25 am
content: Hi there! I am looking for a good unit. I need unit capable of delivering 0-30V, 0-3A (but 0-5A would be nice). I'm searching in polish shops but most units look like rebranded crap. I thought about Rigol but as I found out on their website thier cheapest PSU cost almost 80% more than I can spend. Maybe you can propose me something good and reliable as it is going to be used in work quite extensively? Personally I would take a DIY approach as I usually do but I have a lot to do other than that. Please, do help, please.PS. I used a  button, I found some clues but have to be absolutly 100% sure what to tell my boss to buy.

author: thanasisk
author_rank: Regular Contributor
timestamp: June 14, 2018, 11:27:39 am
content: Perhaps the aim-tti el303r?https://www.aimtti.com/product-category/dc-power-supplies/aim-el-rseries

author: BillB
author_rank: Unknown
timestamp: June 14, 2018, 12:16:23 pm
content: Any other requirements? Programmable? Remote Sense? Resolution?

author: radiolistener
author_rank: Super Contributor
timestamp: June 14, 2018, 12:27:47 pm
content: Here is nice Chinese switching power supply:https://www.aliexpress.com/item/CPS-3232-1000W-0-32V-0-32A-High-power-Digital-Adjustable-Laboratory-DC-Power-Supply-220V/32813324978.html

author: Osaka2407
author_rank: Newbie
timestamp: June 14, 2018, 12:38:18 pm
content: @BillBIt doesn't have to be programmable and it doesn't have to be remote sense capable. I just want simple and reliable power supply. In terms of the resolution. 10mV and 100mA is enough for our use case.@thanasisk, @radiolistenerI will take a look, thanks!

author: apblog
author_rank: Regular Contributor
timestamp: June 14, 2018, 12:57:43 pm
content: I have had a BK precision 1621A for about a decade and it has been rock solid and is very clean. It’s gotten a lot of use and has never given me any trouble.The BK 1627A looks like the same thing but meets your spec of 3A and 30V.

author: 2N3055
author_rank: Super Contributor
timestamp: June 14, 2018, 01:07:02 pm
content: You have GW INSTEK GPS-3030DD at TME...https://www.tme.eu/en/details/gps-3030dd/one-channel-power-supplies/gw-instek/Seems best for your budget

author: Osaka2407
author_rank: Newbie
timestamp: June 14, 2018, 02:48:55 pm
content: Ok guys, thank you very, very much. You are awesome. I think I will choose GPS-3030DD

author: Candid
author_rank: Regular Contributor
timestamp: June 14, 2018, 08:02:02 pm
content: https://www.amazon.com/KORAD-KA3005P-Programmable-Precision-Adjustable/dp/B0085QLNFMCheap and good quality. Korad.

author: Miti
author_rank: Super Contributor
timestamp: June 15, 2018, 12:52:38 am
content: I have Atten PPS3005S for years and it is amazing. See this:https://www.eevblog.com/forum/reviews/playing-with-the-atten-pps3005s-dc-power-supply/