hybridfree/eevblog-posts huggingface dataset:
tek 680B 10X probe attentuation - Page 1
Forum section: electronics / testgear

author: Arjan Emm
author_rank: Regular Contributor
timestamp: March 22, 2015, 05:44:09 pm
content: Hi everyone, first post here. Since a few days i'm a happy owner of a tektronix 680b 1 Ghz scoop. A nice upgrade from my HP54503A.The Hp came with 4 10x 500Mhz probes. Since i never work with signals over a few hundred Khz, these will do fine.But how do i tell the scope the probes are 10x? There are no options in the vertical menu and i can't find anything in the manual.To me it seems only possible through the read out ring/pin. Pretty difficult to make something for that because there are several connections depending on the position of the pin. + and - 5v for active probes and several more connections.Is there a solution for this ?Thanks,arjan.

author: tautech
author_rank: Super Contributor
timestamp: March 22, 2015, 07:39:45 pm
content: Welcome to the forum.For Tek probes, each has a resistor specific to that probes attenuation that shunts a connection on the input of the scope to set the correct attenuation.Have a study of this thread for a solution:https://www.eevblog.com/forum/testgear/automatic-probe-attenuation-setting-just-a-resistor-(tektronix-tds320)/

author: Arjan Emm
author_rank: Regular Contributor
timestamp: March 23, 2015, 05:53:01 am
content: Thank you. That was very helpfull.I just need to find a 3d print shop here in utrecht, the netherlands. That shouldn't be too hard
[?] no input signals on Hantek DSO-2150 USB scope - Page 1
Forum section: electronics / testgear

author: allenpan
author_rank: Contributor
timestamp: March 23, 2015, 01:30:51 am
content: [?] no input signals on Hantek DSO-2150 USB scopei killed my USB DSO, however, PC detecting it, but from the software the signal in input 1 and 2 is just random noise and all 3 U33, U34 and U12 looks a bit odd,,, is there a way to test it if thats the problem?and what are the part number for those parts?
Goldstar GP-505 Power Supply - Page 1
Forum section: electronics / testgear

author: edpalmer42
author_rank: Super Contributor
timestamp: March 22, 2015, 09:05:33 pm
content: I picked up this power supply a couple of weeks ago. It's rated for 50V @ 5A. Old-school linear with switched transformer taps. No fan, but those three big heat sinks (85 x 115 x 45 mm) are positioned directly above slots in the bottom. It's working okay, but I have one question. The manuals that are available online are for a more recent version that doesn't include the external programming option as shown in the last picture. Does anyone have any info on how to use this feature, or perhaps a schematic?Thanks,Ed

author: dom0
author_rank: Super Contributor
timestamp: March 22, 2015, 09:55:06 pm
content: These supplies are programmed analog. Usually some points of the control loop are exposed there, so you can apply an external voltage which the supply will track and stuff like that. Best way to figure out how to use them is to trace the externally available connections to where they connect in the schematic ; the rest should be more or less obvious.

author: edpalmer42
author_rank: Super Contributor
timestamp: March 23, 2015, 12:08:40 am
content: Yes, if I have to trace out the schematic I'm sure that I'll be able to figure it out. But why reinvent the wheel if I don't have to? Someone must have a copy of the manual that explains how to use those terminals.Ed
Cool, Weird, Interesting... - Page 1
Forum section: electronics / testgear

author: SL4P
author_rank: Super Contributor
timestamp: March 21, 2015, 10:26:58 pm
content: Found this eBay seller in US.A bit harsh for shipping, but a great range of surplus tech.Medical, Industrial, Defence - all sorts!http://stores.ebay.com/therightstuff619There are literally THOUSANDS Of interesting lots...Test gear, PSU, scopes, analysers...I wish I was closer! No, I have no affiliation!

author: dadler
author_rank: Unknown
timestamp: March 21, 2015, 10:49:49 pm
content: http://www.ebay.com/itm/SONY-TEKTRONIX-335-AC-DC-MINI-OSCILLOSCOPE-/331509600515I've never seen this model before.

author: SL4P
author_rank: Super Contributor
timestamp: March 21, 2015, 10:58:37 pm
content: Quote from: dadler on March 21, 2015, 10:49:49 pmOddly enough, I had...!Sometime in the 80s. Nice to use, and S-T had several neat products during their short relationship.Back when Sony build quality was the prosumer equivalent of Tek.

author: PaulAm
author_rank: Frequent Contributor
timestamp: March 22, 2015, 12:48:11 am
content: I have one of these. One of these days I'll post some pictures of the interior. It's pretty well packed in there. Sony may have built it, but they used Tek parts.I just bought a spare for parts, but the packaging was marginal and the post office used it as a football (note: do NOT mark your package as fragile! The temptation to abuse it is irresistible!). The CRT is a directly heated cathode and is fairly fragile. This scope suffered a severe G shock and distorted some of the internal geometry, so the CRT is useless.Pretty cool scope though - 35MHz dual channel with delayed sweep and will run off of line or 12V, 1mv/div sensitivity. The attenuator for both channels uses a coaxial control. It's a little funky, but they were running out of real estate on the front panel.Sony/Tek also made the 308, a cute little 8 bit logic analyzer along with some other scopes. I think the 335 was the highest bandwidth model.

author: Vgkid
author_rank: Super Contributor
timestamp: March 22, 2015, 01:07:13 am
content: They have a somewhat recently cal'd gr1620 capacitance bridge for a few grand. A more interesting buy than the 3458a people swoon about.

author: xrunner
author_rank: Super Contributor
timestamp: March 22, 2015, 01:13:59 am
content: Oooh - neat stuff. Must look at it all ...

author: Rupunzell
author_rank: Frequent Contributor
timestamp: March 22, 2015, 06:10:32 am
content: De Anza College Electronics Flea Market in Silly Valley (silicon valley) held once each month.This is where the real bargains and oddities can be found. Google image search has pictures..http://www.electronicsfleamarket.com/scheduleThis ebay seller is one of many warehouses FULL of old, used, surplus and ... bits from Silly Valley.Bernce

author: edavid
author_rank: Super Contributor
timestamp: March 22, 2015, 07:10:14 pm
content: Quote from: Rupunzell on March 22, 2015, 06:10:32 amUmm, except that they are in San Diego...
AEMC 5233 Too Good To Be True? - Page 1
Forum section: electronics / testgear

author: daneck
author_rank: Contributor
timestamp: March 22, 2015, 01:56:26 pm
content: I was about to buy a Fluke 87-5 but came across the AEMC 2125.65 DMM Model 5233 on tequipment.net.Under $100 for specs reasonably comparable to the Fluke, including CAT IV plus non-electrical contact detection.But I don't see any reviews.Does anyone have experience with these meters?

author: Lightages
author_rank: Unknown
timestamp: March 22, 2015, 02:21:18 pm
content: It is a great deal. AEMC is made by a French company,http://www.chauvin-arnoux.com/fr,that makes some different looking meters. Martin Lorton did a review on one that looks like something from Star Trek.This particular model is not well suited to electronics as it doesn't have uA/mA. Other than that it is a very good buy.

author: daneck
author_rank: Contributor
timestamp: March 22, 2015, 04:22:40 pm
content: Thanks, Lightages!Yes, I see some of the ranges are restricted, specificallyDC Current 1mA limit on the low side with no low-current fuseFrequency 3kHz limit on the high sideAll-in-all, though, seems like an inexpensive, capable, general purpose DMM.

author: dom0
author_rank: Super Contributor
timestamp: March 22, 2015, 04:52:34 pm
content: More like an electricians DMM... especially with that low-impedance AC input+n

author: daneck
author_rank: Contributor
timestamp: March 22, 2015, 05:52:16 pm
content: Danke, dom0,Ja, das sehe ich jetzt. Die Spezifikationen und Funktionen sind dem Fluke 117 näher.Dazu, die Herkunft von AEMC (Chauvin Arnoux) scheint Starkstrom zu sein.
Should my Rigol 1054z be reading voltage that isn't there? - Page 1
Forum section: electronics / testgear

author: LektroiD
author_rank: Frequent Contributor
timestamp: March 23, 2015, 03:54:11 pm
content: I have been trying to get the triggering working on two channels. I have followed the thread posted about this, but to no avail. Then I noticed it is showing voltage which isn't present. Nothing plugged in and just recalibrated.I'll post pics of the spurious voltage and also the trigger delay (which only seems to work on one channel)...

author: cyr
author_rank: Frequent Contributor
timestamp: March 23, 2015, 04:02:21 pm
content: A scope (especially a low-end one) is not a precision voltage instrument. You have it set a 1V/div or 8V total range and it only has about 200 steps of resolution. 40-80mV is just one or two steps at that setting. If you still show 40mV offset at say 20mv/div then you have a real problem.

author: LektroiD
author_rank: Frequent Contributor
timestamp: March 23, 2015, 04:20:47 pm
content: So if that's quite normal, and not the cause of my triggering problem. Where should I look now?

author: ebastler
author_rank: Super Contributor
timestamp: March 23, 2015, 05:50:12 pm
content: Quote from: LektroiD on March 23, 2015, 04:20:47 pmI am not quite sure what you are trying to achieve with your delay-triggered measurement. According to your screenshot, you have set the scope to trigger when it sees- a positive edge on channel 1,- which is followed by a positive edge on channel two- within a time smaller than a certain threshold.But you seem to have no signal applied to channel 2. So what are you trying to measure?

author: LektroiD
author_rank: Frequent Contributor
timestamp: March 23, 2015, 06:04:41 pm
content: Quote from: ebastler on March 23, 2015, 05:50:12 pmI see! So the delay trigger needs both signals present to work. Got it! I've only just jumped ship from analogue, so I'm still getting used to the differences. It appears everything is in order...

author: ebastler
author_rank: Super Contributor
timestamp: March 23, 2015, 06:24:49 pm
content: Ah, glad it works for you! Yes, the modern digital scopes can be a bit overwhelming. I certainly have not tried all the options and settings in my DS1054Z yet... The English manual (July 2014 seems to be the latest version) is actually quite decent, and worth a look.Cheers, Juergen
Power Supply Choice Help - Page 1
Forum section: electronics / testgear

author: dindondee
author_rank: Contributor
timestamp: March 21, 2015, 02:24:34 pm
content: Hello,I would like to go ahead to purchase my first PSU. I've been using wall-warts and batteries and work mostly with micro-controllers and low power devices. I'm thinking a triple output between the Rigol DP-832 or the GW Instek GPD-3303S. What about the GPD-4303S, does anyone think that'll be better with the price difference?Or do you know something better, somewhere cheaper?Any help is appreciated. ThanksGPD-4303S -http://www.amazon.com/dp/B0094JU260/ref=biss_dp_t_asnGPD-3303s -http://www.amazon.com/dp/B005DTDZ8C/ref=biss_dp_t_asnRigol DP-832 -http://www.tequipment.net/RigolDP832.html

author: madires
author_rank: Super Contributor
timestamp: March 21, 2015, 02:52:14 pm
content: For hobby usage a Mastech HY3003F-3 (US$170, 2 * 30V/3A + 5V) or HY3005F-3 (US$200, 2 * 30V/5A + 5V) might be not a bad idea.
Scullcom Hobby Electronics 11 - Design _ Building a Precision Voltage Reference  - Page 1
Forum section: electronics / testgear

author: retiredcaps
author_rank: Super Contributor
timestamp: March 21, 2015, 10:27:37 pm
content: I won't be able to watch this until later tonight, but given all the DIY precision voltage reference threads, I thought this might be interesting to people.

author: icon
author_rank: Regular Contributor
timestamp: March 21, 2015, 11:00:08 pm
content: Just watched it now. Very interesting. I like this chap's style - easy to listen to.John

author: Tallie
author_rank: Regular Contributor
timestamp: March 22, 2015, 12:55:46 am
content: Neat project. Thanks for sharing!
Fluke 117 Electricians True RMS Multimeter - Page 1
Forum section: electronics / testgear

author: Stargateqwerty
author_rank: Newbie
timestamp: March 21, 2015, 11:03:55 pm
content: Is the Fluke 117 Electricians True RMS Multimeter a good quality multimeter?

author: Fungus
author_rank: Super Contributor
timestamp: March 21, 2015, 11:12:00 pm
content: Yes.(It's a Fluke...!)

author: retiredcaps
author_rank: Super Contributor
timestamp: March 21, 2015, 11:21:04 pm
content: Quote from: Stargateqwerty on March 21, 2015, 11:03:55 pmYes, it is a good quality meter, but what are your requirements for a multimeter? For example, if you need to measure milli or micro amps, the 117 doesn't have that feature.BTW, Dave did a video on the 117, way back in #60 five years ago.
Stack CP-210 60MHz probe - can't find any info about it - Page 1
Forum section: electronics / testgear

author: tzok
author_rank: Regular Contributor
timestamp: March 20, 2015, 08:42:27 pm
content: Long time ago I've bought a C1-112A scope and get a Stack CP-210 60MHz probe with it. It looks solid and reliable, but I can't find any info about it. Maybe someone knows something more about this probe. Is it worth anything?It's label says:CP-21060MHzSTACKMade in Japan

author: dom0
author_rank: Super Contributor
timestamp: March 20, 2015, 08:52:53 pm
content: Why not try it yourself?

author: tautech
author_rank: Super Contributor
timestamp: March 20, 2015, 08:53:35 pm
content: Considering you can buy P6100 (100 MHz) probes for ~US$15 a pair delivered I doubt they are worth much.

author: dom0
author_rank: Super Contributor
timestamp: March 20, 2015, 09:01:29 pm
content: Wait, he meant that ... literally? "worth anything" like in money?

author: tzok
author_rank: Regular Contributor
timestamp: March 20, 2015, 09:12:24 pm
content: Not literally, I meant is it better than "no-name" Chinese 70/100MHz probes? Mainly I'm looking for some specs of this probe and when it was produced.

author: dom0
author_rank: Super Contributor
timestamp: March 20, 2015, 10:27:38 pm
content: There isn't much more to a probe like theserun of a mill x1/x10 low bandwidth probeselectrically than it's transfer function (gain/phase), and you can see if that one looks good easily (i.e. fast square wave / compensation).The mechanical and handling aspects are felt easily.Given that this thing was probably made by some company that ceases to exist a few decades ago in the 70s or maybe 80s it's rather unlikely that you'll find any specs for it. Okay, compensation range might be interesting, but I mean, you'll see if it's sufficient for your scope or not when you try to compensate it.So, I suggest, no more talking, try it out, see if it behaves and handles well... sometimes turning something on is much better than taking it apart, even if the taking apart part is just with words

author: tzok
author_rank: Regular Contributor
timestamp: March 20, 2015, 10:51:52 pm
content: Basically it works, and it compensates without any problem. But I don't have equipment to further test it (all I have is SDS1022 and an "ancient" 1,1MHz function generator Meratronik model G432). I was just curious whether anyone knows something about this probe and company which made it. Was it a low-end or something better.I thought that if I could find datasheets for vacuum tubes from '60s or old Polish germanium transistors, so why not for a Japanese probe?

author: rdl
author_rank: Super Contributor
timestamp: March 21, 2015, 05:35:36 am
content: Maybe that probe was made by Stack Electronics in Japan.Maybe you could try and contact them to see if they did make it and if they have any info about it.www.stack-elec.co.jp/They look like one of those companies that won't respond unless you're spending lots of money, but you never know.
Backing Up HP 85620A Mass Storage Module - Page 1
Forum section: electronics / testgear

author: NF6X
author_rank: Unknown
timestamp: February 22, 2015, 04:31:04 pm
content: I just got a nice, calibrated HP 8560E spectrum analyzer, after getting some good advice inthis other thread. It includes an 85620A mass storage module, and the seller helpfully preloaded the module with some Useful Stuff.I'd like to back up the contents of the module's internal SRAM to my Mac (and of course, have the ability to restore it later). In particular, the Stuff that evaporates after 10 uses. Is there a way to do that via the HPIB interface? I haven't identified suitable commands in the manuals for doing that yet, but maybe there are some undocumented commands that y'all have discovered?Of course, it should be quite possible to build an interface that I could plug the module into in order to dump out the SRAM contents, since the module's manual helpfully includes a complete module schematic. But it would be easier if I could dump it via HPIB without needing to build any special hardware.I think I'll also get at least one plug-in memory card for it, so I can possibly design a compatible replacement and/or a USB adapter for reading/writing card contents. The mass storage module manual provides the memory card connector pinout. Maybe there's some prior art out there that I haven't found yet?

author: NF6X
author_rank: Unknown
timestamp: February 22, 2015, 09:16:48 pm
content: While googling for information about the 85620A module, I didn't see any pictures of its innards. Well, that's just wrong! So I included a few when I took pictures of my 8560E spectrum analyzer:http://www.nf6x.net/2015/02/hp-8560e-spectrum-analyzer/Yes, I've linked this same page in another post about my 8560E... I'm linking to it here, too, just to help future 85620A researchers find them.

author: nouserid
author_rank: Contributor
timestamp: March 20, 2015, 11:08:25 pm
content: I have the same question. It seems that using a 85700A RAM card might be the easiest way to back them up. However, I would also like to view and edit the content of these DLPs, so I'd like to know if there is a method to extract these DLPs by GPIB.
Tektronix 213 teardown - Page 1
Forum section: electronics / testgear

author: SeanB
author_rank: Super Contributor
timestamp: March 19, 2015, 07:45:04 pm
content: The Seiko also matches the colour scheme of the scope. Very nice.

author: WackyGerman
author_rank: Regular Contributor
timestamp: March 19, 2015, 07:50:44 pm
content: Well that looks really nice . Seems to be in really good condition . What a beauty

author: JacquesBBB
author_rank: Frequent Contributor
timestamp: March 19, 2015, 09:04:24 pm
content: http://www.ebay.com/itm/TEKTRONIX-213-DMM-OSCILLOSCOPE-/121599324344?pt=LH_DefaultDomain_0&hash=item1c4fe270b811.5$ by now
unknown reference for a photodiode - Page 1
Forum section: electronics / testgear

author: louis
author_rank: Newbie
timestamp: March 19, 2015, 07:38:05 pm
content: Hi all,I am looking for the reference of the central component in the attached picture. I found it when tearing down a particle counter.It is a photodiode 35mm by 45mm.It looks like the BPW34 S-Z but it seems that the two pins on the left of the picture are not connected while they seem to be in the BPW34 S-Z.http://www.digikey.com/product-detail/en/BPW%2034%20S-Z/475-2659-1-ND/1893861What do you think ?Thank you very much !Louis
Rigol DP832 leak - Page 1
Forum section: electronics / testgear

author: klaus11
author_rank: Unknown
timestamp: March 18, 2015, 01:02:27 pm
content: Hello, I received a new unit DP832, and I detected on channel 1 and 2, a voltage 2-6mV (as this cold or 20 minutes power on) channels being off. Any Idea.

author: H.O
author_rank: Frequent Contributor
timestamp: March 18, 2015, 05:48:12 pm
content: Hi,My idea is to not worry about it. I mean, is there a specific reason 6mV (0.006V) bothers you? I guess there is since you're asking about it....The specifications for the DP832 says +/-0.05% +20mV so even with a programmed voltage of 0V a 6mV offset is well within its specifications. I understand that you're not actuallysettingthe voltage to 0V but turning the output "off" but since the output isn't actually disconnected (ie. with a relay for example)my guessis that turning the output "off" is pretty much the same as setting the output voltage to 0 as far as internal control goes.

author: dadler
author_rank: Unknown
timestamp: March 18, 2015, 06:14:34 pm
content: Mine does the same thing. This is common with these units. There is no physical disconnect, the outputs are actively controlled even when the channels are "off". It bothers me too, but it is only a psychological concern, as in practice this should have almost no effect.

author: klaus11
author_rank: Unknown
timestamp: March 18, 2015, 08:10:43 pm
content: Your answers let me calmer, believed that my unit came too defective. Although I must say I did contact Batronix company who sold me the unit and its engineer told me "I have to contact Rigol Regarding esta issue, it's new to me ..." and since two days ago I hope to answer, and the only response was yours Thanks.

author: dadler
author_rank: Unknown
timestamp: March 18, 2015, 09:05:01 pm
content: Quote from: klaus11 on March 18, 2015, 08:10:43 pmHere is the topic where I and another fellow asked the same question:https://www.eevblog.com/forum/beginners/should-a-good-power-supply-have-measurable-voltagecurrent-when-channel-off/
DMM Archaeology at the Local Electronics Shop - Page 1
Forum section: electronics / testgear

author: tooki
author_rank: Super Contributor
timestamp: March 19, 2015, 02:05:01 pm
content: So I was at the local components shop (one of the dusty old-school ones with little bins of parts, many of which have been sitting there unsold for decades), and decided to take a closer look at their display cases, which are often kinda hidden behind signs and boxes and whatnot. And I found some fossils I thought you guys might enjoy:First, some Flukes that have been on display since nearly time immemorial. It makes me sad that these lovely devices have never gotten any use.Still wearing its original price tag of 3299 Swiss Francs, a mint Fluke 97:I'd never even heard of the Fluke 863 before, and even Google seems to know very little about it:There were also a few still-sealed Fluke 88 meters, as peeking out from behind the ScopeMeter.Additionally, it appears this shop has been selling Uni-T meters for a LONG time. They carry the modern UT61 series, for example. And then there's this:And below that one, the piece de resistance as far as age is concerned:P.S. On the local equivalent of eBay, there's anauction for a Fluke 45 bench meter. The buy it now price is about $240, and the current bid under 100. Is this a worthwhile buy as a second meter? (I have an 87V.)

author: Towger
author_rank: Super Contributor
timestamp: March 19, 2015, 02:23:07 pm
content: A solar powered multimeter? Sanwa, never seen one before, this looks like the modern version :http://www.directindustry.com/prod/sanwa-electric-instrument/digital-multimeters-solar-33114-696219.html

author: tooki
author_rank: Super Contributor
timestamp: March 19, 2015, 02:25:25 pm
content: I think the Uni-T in the picture is solar, too. I wonder if that's safe?

author: BradC
author_rank: Super Contributor
timestamp: March 19, 2015, 02:46:38 pm
content: Quote from: tooki on March 19, 2015, 02:05:01 pmYou can pry my PM97 from my cold dead hands. One day I'll even replace the backlight EL Panel.Only on its second set of batteries too!
TDS684B noise measurment. Is this normal? - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: March 17, 2015, 12:21:37 pm
content: Hello all,I've attached a picture of a TDS684B and a TDS7054 with their inputs set to 50 Ohms 1VDC per division and coupling set to GND. The measurement is set for Pk-Pk amplitude. The measurement shows 160mV of noise. I've tried the test on a TDS684C as well and all seem to show roughly the same amount of noise. Is this normal?I suspect there's a good reason for this, and would be very interested in knowing why.Thanks!Jay

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 17, 2015, 01:22:37 pm
content: What's the bandwidth?Looks like normal noise of the internal preamp / driver / ADC. Knock it down to a lower bandwidth setting (or turn on averaging) and it should decrease accordingly.The scale of the "signal" doesn't matter, because it's a few counts at the ADC, not actually a few volts at the input.For further reading, check out the user manual in great detail (it should specify what the noise floor and bandwidth is on various ranges), and read up on theory like the Shannon "noisy channel" theorem, Johnson-Nyquist noise, and etc.Tim

author: tszaboo
author_rank: Super Contributor
timestamp: March 17, 2015, 01:31:30 pm
content: The scope has 8 bit resolution, than you have ~10 LSB noise. I think it is good for a Tektronics. Probably they have their usual overclocked ADCs and lowest cost analog front end before it.

author: rf-loop
author_rank: Super Contributor
timestamp: March 17, 2015, 01:33:24 pm
content: Looks normal.http://cp.literature.agilent.com/litweb/pdf/5989-3020EN.pdf

author: Jwalling
author_rank: Unknown
timestamp: March 18, 2015, 04:58:34 pm
content: Quote from: rf-loop on March 17, 2015, 01:33:24 pmExcellent doc! Thank you for that, and thanks to all who took the time to reply.Jay

author: tautech
author_rank: Super Contributor
timestamp: March 18, 2015, 07:18:54 pm
content: Further info:http://www.eevblog.com/2014/04/10/eevblog-601-why-digital-oscilloscopes-appear-noisy/http://www.eevblog.com/2014/04/27/eevblog-610-why-digital-scopes-appear-noisy-part-2/
Agilent MSO2000 problem - Page 1
Forum section: electronics / testgear

author: and101
author_rank: Contributor
timestamp: October 21, 2014, 04:19:22 pm
content: My Agilent MSO2000 scope has developed a problem and I was wondering if anyone else has experienced something similar and knows how to fix it.When I press the power button the fan starts and the leds flash briefly then the Ref, Math and Digital buttons light like it should do when starting but that is as far as it gets, the three LEDs stay lit and nothing else happens. I haven't used the scope for a few weeks and it was working perfectly last time I used it so I am not sure what has gone wrong.Hopefully someone can help and it doesn't need to be sent back to Agilent for repair.

author: HighVoltage
author_rank: Super Contributor
timestamp: October 21, 2014, 04:59:37 pm
content: There is probably not much that you can do, without opening the scope.And if you open it, you break the warranty seal.If it is still under warranty, I would send it in to Agilent.I had an Agilent generator go bad after a few month and within a few days I had a new one delivered by Agilent.

author: and101
author_rank: Contributor
timestamp: October 21, 2014, 05:06:09 pm
content: It is still under warranty so I will get in touch with Agilent and see what they say. I was just hoping that it might be something simple like hold a button down on start up to reset it.

author: georgd
author_rank: Regular Contributor
timestamp: October 21, 2014, 05:07:37 pm
content: Several DSOX2000 ownsers report the same problem.Solution is to send equipment to service, customers reports prompt responds from Agilent.

author: DavidDLC
author_rank: Frequent Contributor
timestamp: October 21, 2014, 05:09:28 pm
content: Prepare a USB with the bootloader on it, and try to boot it with the USB thumb drive (inserted).David.

author: and101
author_rank: Contributor
timestamp: October 21, 2014, 05:30:31 pm
content: I just tried booting it from a USB stick and it doesn't seem to be getting far enough through the boot sequence for that to work so it is probably a hardware fault or corrupt boot loader. I have sent off a technical support request to Agilent, or whatever they are called this week, so hopefully they can fix it.

author: Hydrawerk
author_rank: Super Contributor
timestamp: October 21, 2014, 08:17:10 pm
content: It should be called Agilent MSOX2000 series scope.

author: Hydrawerk
author_rank: Super Contributor
timestamp: October 21, 2014, 08:18:48 pm
content: Quote from: HighVoltage on October 21, 2014, 04:59:37 pmIs there any warranty seal?? At my DSOX2002A, there is none. No sticker or anything.

author: JoeB83
author_rank: Regular Contributor
timestamp: March 18, 2015, 05:34:22 pm
content: I know this is an ancient thread, but I'm having the same problem with my DSOX2022A-what did Agilent say about it? Did they fix it under warrantee?
BK Precision Analog Meter Model 116 - Page 1
Forum section: electronics / testgear

author: silverlego3
author_rank: Contributor
timestamp: March 18, 2015, 12:32:14 am
content: hello Everyone!So I got my first analog meter the other day and I noticed something strange about it.When I have it sitting flat on the table it will read 0 when it is off, but when I stand it up on its stand the needle will move up quite a bit. Does anyone have any idea why it does this and if it can be fixed?

author: radix
author_rank: Contributor
timestamp: March 18, 2015, 12:54:59 am
content: It's probably because of inadequate balancing of the needle. You can't really fix that yourself. Most analog meters are meant to be used lying flat anyway.

author: barry14
author_rank: Regular Contributor
timestamp: March 18, 2015, 02:45:34 am
content: This is typical of analog meter movements. The Simpson 260 specifications only hold in the horizontal position. I will admit, however, that the movement of your meter from horizontal to vertical seems excessive. There may be a problem with the meter movement but there is little that you can do about it.

author: TimFox
author_rank: Super Contributor
timestamp: March 18, 2015, 02:11:33 pm
content: Can you re-zero the movement with the plastic screw near the pivot point after shifting from horizontal to vertical?If not, the movement is probably beyond hope.

author: silverlego3
author_rank: Contributor
timestamp: March 18, 2015, 02:57:47 pm
content: Quote from: TimFox on March 18, 2015, 02:11:33 pmNo I can not re-zero the needle if I stand it up.I guess I'll have to use this meter while its laying down on the job.
HP 54620C Logic Analyser - Page 1
Forum section: electronics / testgear

author: drakke
author_rank: Regular Contributor
timestamp: March 18, 2015, 12:26:01 am
content: Is this worthwhile as a first LA?I was going to buy a open workbench logic sniffer and a bus pirate but this may be more interesting.It is built on a 54620 series oscilloscope.Are they serviceable? Easy to repair?http://www.ebay.ca/itm/Hewlett-Packard-54620C-Logic-Analyzer-16-Channel-VGC-Free-Shipping-/221397643925?pt=LH_DefaultDomain_0&hash=item338c53f295Thanks

author: edavid
author_rank: Super Contributor
timestamp: March 18, 2015, 12:37:47 am
content: Never buy a logic analyzer without probes...

author: drakke
author_rank: Regular Contributor
timestamp: March 18, 2015, 12:45:19 am
content: Quote from: edavid on March 18, 2015, 12:37:47 amWhy? Impossible to test beforehand or because the probes are expensive?Also can I use non-Agilent ones instead?Are these difficult/impossible to repair?

author: edavid
author_rank: Super Contributor
timestamp: March 18, 2015, 01:43:46 am
content: Quote from: drakke on March 18, 2015, 12:45:19 amBecause it's harder to find the probes than the analyzers, and if you are patient you will find a complete unit for the same price.You don't have to believe me though... go and find a source for HP 54620C probesQuoteNo.

author: MadTux
author_rank: Frequent Contributor
timestamp: March 18, 2015, 01:57:25 am
content: Quote from: drakke on March 18, 2015, 12:26:01 amYes, if you like an impressive 8k/2k deep sample memory on as much as 16 channels, then go for it.Otherwise you'd better pick something like a 16500B/C or 1670/16700. Equally old, but with much better specs.
Actually using a thermography camera - Page 1
Forum section: electronics / testgear

author: babysitter
author_rank: Frequent Contributor
timestamp: March 17, 2015, 05:02:08 am
content: Hi Folks,I just requested a FLIR E60 at work, chances are good the people with the money fold to my wish.Up to now there are mostly teardown videos. But I want to use it, insteadAny hints for successful operation?I am aware of the problems with reflecting surfaces.I am looking into a method to get a good uniform, constant and ideally known emissivity.Is there any suggestion how to paint or cover parts to get them to emit the right thing(tm)?My idea is using black printer toner, maybe to a warmish surface that its resin contents like to hold to the part under test. However, I haven't yet checked if i sticks and - what would be bad - the layer is conductive.Also, as lenses are made sometimes of GaAs, I have a 8ish inch wafer at hand. I dont want to cut it up but after using a remote control and digicam to confirm the estimated IR transmissivity, I guess I could use it as a window to reduce air drafts, right?

author: AndyC_772
author_rank: Super Contributor
timestamp: March 17, 2015, 09:58:38 am
content: Black insulating tape. Just stick a piece to any reflective surface you want to measure.

author: -jeffB
author_rank: Regular Contributor
timestamp: March 17, 2015, 05:38:19 pm
content: Quote from: babysitter on March 17, 2015, 05:02:08 amWell, the near-IR used by remotes is a lot shorter-wave, but it looks like GaAs should bemoretransparent in the thermal IR range, with a nice flat transmission profile from 2 to 12 or so microns. It's certainly worth a try.
python-based instrument control - Page 1
Forum section: electronics / testgear

author: troubleshooter
author_rank: Newbie
timestamp: March 17, 2015, 05:16:28 pm
content: Hi,If I'm not asking at the right place, please transfert my post.I have a Stanford Research System SIM900 Mainframe and I can communicate with it using Pyvisa. Now, I would like to communicate with the PID module SIM960 connnected to it.I can send commands such as : mainframe.ask("*IDN?"), etc...My problem is that I cannot send command to the module.For example to assign the module to the 4th mainframe port outside of python I would have to type : CONN 4,"PID"and I could then type: PID*IDN?to get the model of the module with the variable name PID.In python I can only give one argument to mainframe and I cannot write something like : mainframe.write("CONN 4, "PID"") or mainframe.write("PID*IDN?")To summarize, I want to send command from python to the PID module through the mainframe (COM5 for example) but I don't know what's the syntax for it. (or if it is possible)Does anyone ever experienced this situation?Thanks

author: Lukas
author_rank: Frequent Contributor
timestamp: March 17, 2015, 05:45:29 pm
content: Quote from: troubleshooter on March 17, 2015, 05:16:28 pmThere are no such things like arguments. VISA isn't much more than string in-string out. Your example should have raised a Syntax error because of incorrect escaping. either use .write('CONN 4, "PID"') or .write("CONN 4, \"PID\""). You didn't say which VISA implementation you're using. Agi^H^H^HKeysight VISA has got a VISA monitor that allows you to examine the VISA commands that you send to the instrument. NI VISA should provide something similar. Have you tried sending the commands using the interactive shell provided by your VISA vendor?

author: troubleshooter
author_rank: Newbie
timestamp: March 17, 2015, 07:22:15 pm
content: Hi Lukas,Thanks a lot for the reply. Indeed, my problem was only about the syntax. Using write.('CONN 4, "PID"') worked as it is considered as one string.I'm using NI-VISA. I didn't know about this VISA monitor but I just tested the interactive shell they provide and it's great.Cheers
Purchased RIGOL DS1074Z with 1104Z Firmware and all features unlocked!! - Page 1
Forum section: electronics / testgear

author: saminvent
author_rank: Newbie
timestamp: March 13, 2015, 10:41:35 pm
content: Hi all,I purchased the DS1074Z model oscilloscope (fairly sure it was from Batronix, can't remember exactly and no I'm not advertising for them, I just foresee it'ssomething people will ask), it was actually a purchase by the company I work for, with the intention of 'upgrading' it to the 100MHz bandwidth,but after using the scope for around a month now, I had some spare time today to look into it and to my surprise (don't have a clue how I missed this, I did check)it has the DS1104Z model number in the firmware and (although I'd noticed beforehand, but wasn't sure) all software features are fully enabled, no time limits!I wanted to purchase the 1054Z model and upgrade that, however there were none in stock anywhere, anyway it's still the best bargain I think I've ever had..(well I didn't pay for it but whatever..)Has anyone else had a similar experience?Sam

author: DanielS
author_rank: Frequent Contributor
timestamp: March 13, 2015, 11:39:52 pm
content: Someone may have returned their 1054Z after unlocking it and you got that returned unit.

author: saminvent
author_rank: Newbie
timestamp: March 14, 2015, 12:01:31 am
content: Good point and it wasn't double boxed, maybe that's why? I don't know how frequently they are double boxed?

author: Howardlong
author_rank: Super Contributor
timestamp: March 14, 2015, 08:36:18 am
content: In my limited experience of purchasing Rigol from Batronix, unlike some other Rigol retailers, Batronix don't perform latest firmware updates prior to dispatch, whatever was on the scope from the factory is shipped. It sounds like you may have a returned unit, but if it works, and appears pristine, I wouldn't complain!

author: Datman
author_rank: Regular Contributor
timestamp: March 17, 2015, 10:14:11 am
content: HiDo you see some noise on the track? I talked about it here:https://www.eevblog.com/forum/testgear/new-rigol-ds1054z-oscilloscope/1125/

author: Fungus
author_rank: Super Contributor
timestamp: March 17, 2015, 12:54:05 pm
content: Quote from: DanielS on March 13, 2015, 11:39:52 pmThis.
Poltergeist in bikeshop - Page 1
Forum section: electronics / testgear

author: asteen
author_rank: Newbie
timestamp: March 15, 2015, 04:40:19 pm
content: I was wasting some time in youtube, and found this funny video. I would like to have some inputs from this community.-Watch it here -- ><--Have a good dayAnders.

author: sacherjj
author_rank: Frequent Contributor
timestamp: March 15, 2015, 04:45:51 pm
content: Induced EMF into the meter leads. Twist the leads together along the length to eliminate.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 16, 2015, 01:53:10 am
content: Motorcycle doubles as a broad spectrum radio jammer!Also, they seriously overpaid for that meter... I've used a RadioShack DMM for years, in some pretty noisy conditions, and it always reads correctly. Want to bet Snap-on rebrands some Chinese POS and marks it up 20,000%?Tim

author: LaurentR
author_rank: Frequent Contributor
timestamp: March 16, 2015, 04:44:53 am
content: Quote from: T3sl4co1l on March 16, 2015, 01:53:10 amWow, that's a serious markup.https://store.snapon.com/Automotive-Digital-Multimeters-Multimeter-Digital-Advanced-Manual-Ranging-P647143.aspx$172 for manual ranging, no TRMS, CatIII 600V.Made in Korea according to the website.Or you can get the TRMS version for $595...https://store.snapon.com/Automotive-Digital-Multimeters-Multimeter-Digital-Automotive-True-RMS-P647144.aspx

author: necessaryevil
author_rank: Regular Contributor
timestamp: March 16, 2015, 09:33:54 pm
content: They don't call it ghost voltages for no reasonI'm not actually sure it's the same thing

author: TimFox
author_rank: Super Contributor
timestamp: March 17, 2015, 01:31:56 pm
content: Try spectral analysis of this problem.

author: AndyC_772
author_rank: Super Contributor
timestamp: March 17, 2015, 02:21:13 pm
content: High frequency ignition noise vs poor quality meter. I had something similar happen to me when probing the output of a dc-dc converter with a relatively cheap (but previously reliable) Tenma meter. Switching to my Fluke 89IV instead cured the "problem".
Quality Instruments in China - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: March 17, 2015, 02:29:07 am
content: Here are some of the nice gems I found browsing the shops in Shenzhen and Guangzhou. Note the German quality HANEG meter and the genuine FUKE DMMs, which actually seem to be a name brand, with many shops selling loads of em.Not pictured is the UAT-B multimeter and the Thinkpad T61 that was completely relabeled wit an Intel i7 sticker and a Thinkpad T430 label. The shop owner wanted RMB6000. I promptly offered 500 and was cursed out in mandarin

author: tautech
author_rank: Super Contributor
timestamp: March 17, 2015, 03:17:35 am
content: Quote from: echen1024 on March 17, 2015, 02:29:07 amIf you pays your money they will brand it whatever you like.echen DMM anybody?

author: pickle9000
author_rank: Super Contributor
timestamp: March 17, 2015, 04:02:51 am
content: Chinese brand names. Could make an interesting thread.Hamster brand oscilloscopes, Panda DMM's, Uncle Sammy Capacitance Meter.

author: Wytnucls
author_rank: Super Contributor
timestamp: March 17, 2015, 04:21:20 am
content: Haven't seen any of those dodgy brand names in Shanghai, but one explanation might be that there are far less foreigners shopping on electronics markets in that city.
Analog Discovery Pitfall - Page 1
Forum section: electronics / testgear

author: blueskull
author_rank: Unknown
timestamp: March 17, 2015, 01:40:45 am
content: I just got my analog discovery delivered today. I hooked it up, and did some experiments.It seems the AWG has a pitfall in its square wave and square-saw wave functions.The jitter is extremely high, and it is not random. The jitter is extremely stable, to be precisely, 10nS.I double checked this output using either the integrated scope channel and my VDS3102 USB scope. The results are the same.I suspect the problem comes from the DDS module, and I think all AWG can not directly (without comparator) generate precision square wave.Am I right? Or if there are any other reasons?

author: tggzzz
author_rank: Super Contributor
timestamp: March 17, 2015, 08:30:51 am
content: It has a 100MHz clock = 10ns (not nS).If you want a 99MHz clock you will have to use a DDS to generate a sine wave, use an analogue filter that to remove harmonics, then use a comparator to regenerate a square wave. See, for example the ad9851 for how to do that.
Thurlby DSA524: New software - Page 1
Forum section: electronics / testgear

author: tomizett
author_rank: Newbie
timestamp: October 08, 2014, 12:04:36 pm
content: Hi All,New here - been reading for a while but just registered.Just wanted to notify anyone interested that I've recently released a piece of data-acquisition software for the DSA524 - it's available here:http://sourceforge.net/projects/dsaquire/I've also uploaded various other resources I've collected that relate to this instrument - namely some manuals and dumps of the firmware.Hope this is useful to some of you... tell your friends!

author: Agent24
author_rank: Regular Contributor
timestamp: March 17, 2015, 12:07:47 am
content: Do you have any known working firmware files?I dumped one which is identical to the v2.83 you have but don't know if it's OK as my DSA524 does not work.
Video, measuring small-value inductors with handheld LCR meter  - Page 1
Forum section: electronics / testgear

author: Alexei.Polkhanov
author_rank: Frequent Contributor
timestamp: March 16, 2015, 05:12:58 pm
content: Hi everybody,I made a small video where I shared some of tricks and my experience of designing and measuring small-value inductors with handheld LCR meter. Sorry for a slip of tongue -RIG = JIGHope somebody will find it useful.Enjoy.

author: Rory
author_rank: Frequent Contributor
timestamp: March 16, 2015, 08:51:24 pm
content: Thanks for taking the effort to make this video.I have a few observations:1) Are you taking into account the stray capacitance of your inductor test jig? Is the bottom layer split as well as the top, if it is double sided PCB material? Otherwise you have a PCB capacitor in parallel with your DUT. Also you introduce a small amount of stray capacitance with the PCB material extending past the banana plugs. Basically you've made a small dipole antenna.2) Did you perform an open/short calibration of your LCR meter prior to taking measurements? On top of that, you switch from the PCB test jig to the tweezer probe without recalibrating the meter. Can you see where this could cause accuracy problems with the tweezer?3) For me, one of the most useful purposes of the LCR meter is that it gives me the ability to pick specific devices out of a batch of components that more closely match calculated requirements. Try reading the values of a batch of ceramic capacitors and see how closely they measure to their manufacturer's specification. Being able to use more accurate components means filters, tanks and other tuned circuits more closely meet their design specification and give better performance in real life.4) Gold plating on the tweezer probes does not introduce significant error. If you want to reuse chip components, clean them with IPA before measuring them to get rid of the flux or other contaminants.

author: Alexei.Polkhanov
author_rank: Frequent Contributor
timestamp: March 16, 2015, 09:38:05 pm
content: No, this is single sided PCB. Sorry it was not clearly visible in video.Regarding tweezers - when it jumps from 5pF to 4.7uF accuracy does not matter - it simply means no connection. Most of components in that bin are actually new, never used, just exposed to air. Perhaps if they made tips of tweezers sharp and spiky instead of flat and gold plated they would be more useful.
Advantest R6551 DMM - Page 1
Forum section: electronics / testgear

author: radhaz
author_rank: Regular Contributor
timestamp: March 16, 2015, 04:04:00 am
content: I purchased an Advantest R6551 bench DMM from ebay. It has an issue in that all modes drift around an offset of 10s to 100s of counts as if there is noise in the circuit. AC volts is the worst.This was a 230VAC unit, and I powered it up using a step up transformer. I opened the unit and saw a jumper to select the input voltage, so I changed the input to my local 120VAC, but there was no change in performance.The PCA appears to have not been meddled with with the exception of the battery, which had rosin residue indicating it was changed at some point. The date on the battery is from '03, and it measures 3.7 or so volts.I wonder if the cal has been lost. Does the drifting fit the description of a lost cal? The user manual has a cal procedure, and I'll try that when I have time.

author: Vgkid
author_rank: Super Contributor
timestamp: March 16, 2015, 06:50:13 am
content: Do you have the leads shorted when testing?

author: radhaz
author_rank: Regular Contributor
timestamp: March 16, 2015, 10:58:45 pm
content: Leads are shorted in all modes.

author: Testtech
author_rank: Regular Contributor
timestamp: March 16, 2015, 11:46:47 pm
content: Check or replace all the aluminum electrolytic caps. The symptom suggest power supply noise. I would replace them if it were in my shop.