hybridfree/eevblog-posts huggingface dataset:
Velleman HPG1 - Page 1
Forum section: electronics / testgear

author: tony3d
author_rank: Frequent Contributor
timestamp: January 03, 2014, 03:43:56 am
content: Hi, I got a new HPG1 for Christmas, and noticed when I use the sweep function, I get these little noise spikes in the sign wave. Is this normal?I know this thing is basically a toy, but I want to know if it is defective or not. I only get this when I use the sweep function. regular sine waves look fine.

author: marmad
author_rank: Super Contributor
timestamp: January 03, 2014, 02:18:17 pm
content: Quote from: tony3d on January 03, 2014, 03:43:56 amLooks like quantization error (noise) to me - I don't think it's anything to be concerned about.

author: dexters_lab
author_rank: Unknown
timestamp: January 03, 2014, 02:25:27 pm
content: i dont get noise specifically in the sweep function, but at low output power it gets very noisy/glitchy in EVERY modesee video:http://youtu.be/qaZ3lpFKRS0note the video shows two runs, one at max power, one at close to lowest, see the v/div setting at the bottom left hand.

author: tony3d
author_rank: Frequent Contributor
timestamp: January 03, 2014, 02:33:54 pm
content: Quote from: dexters_lab on January 03, 2014, 02:25:27 pmYes, your getting the exact same thing I am, more so at lower frequencies. Thanks for the video. Must be typical for this little thing.
HP 54610B as a first scope? - Page 1
Forum section: electronics / testgear

author: Prime73
author_rank: Regular Contributor
timestamp: January 03, 2014, 01:07:41 am
content: Hello guys,I'm looking for a "cheap" scope like many other beginners hereI've found a few offers on ebay for HP 54610B at around $300 which seem like a good deal for a 500MHz 2 channel scope? Don't really wanna spent much than that. Anyone has any comments on that scope? Initially I was thinking to get something from Owon (or similar) within that price range, but then decided to take a look at used scopes within the same price bracket. I think it's a good idea...Any comments are appreciated.Cheers!

author: DL8RI
author_rank: Regular Contributor
timestamp: January 03, 2014, 01:13:20 am
content: Hi,500MHz reads nice on the first glance, but is has only 20MS/s, or am I wrong?Edit:Yes, I found a Datasheet:http://www.helmut-singer.de/stock/-2017418013.html20MS/s -> 2MHz single-shot. 4k Memory (or 2x2k).If that is usable or not depends on your application, what do you want to do with it?

author: Prime73
author_rank: Regular Contributor
timestamp: January 03, 2014, 01:15:21 am
content: yes, you're right... 20MS/sQuote from: DL8RI on January 03, 2014, 01:13:20 am

author: DL8RI
author_rank: Regular Contributor
timestamp: January 03, 2014, 01:25:12 am
content: If thats good for you depends very much on the work you want to do.If you want to watch repetitive stuff like e.g. impulse-responses, it may be a cheap and good solution.If you want to debug your µC-Circuit, i'd choose another scope with higher sampling-speed (10x the Signal) and more Memory-Depth.If you want to do Audio it's usable, but far to expensive for your needs.And so on...BUT on the pro-side this scope has a nice game build in

author: Prime73
author_rank: Regular Contributor
timestamp: January 03, 2014, 01:36:36 am
content: My projects mostly audio related, however I work on some USB devices as well and need a scope to troubleshoot these. I used to have a scope in high school ( a loooong time ago) and have done some hobbyist projects over the years. Had a "brake" for a few years and decided to get back into the game. So... not a complete newbie but more like an occasional hobbyistCertainly not a pro.Quote from: DL8RI on January 03, 2014, 01:25:12 am
Hantek DSO4102B - Page 1
Forum section: electronics / testgear

author: Hagis2k
author_rank: Regular Contributor
timestamp: January 02, 2014, 10:27:00 pm
content: Well been thinking of buying a oscilloscope for years.And i been watching daves review on the rigol ds1052e but lord there is a jungle out thereSo i been looking at both owon, rigol, hantek, siglent and more in the price class 300-600$So far i looked into these:Owon:http://www.ebay.de/itm/Digital-Speicher-Oszilloskop-Owon-SDS7102-100MHz-1GS-s-/130554316970?pt=Mess_Pr%C3%BCftechnik&hash=item1e65a4c8aaAbout 620$Siglent:http://www.ebay.de/itm/SDS1102DL-7-inch-Widescreen-100MHZ-500MSa-s-32Kpts-Digital-Oscilloscope-/261355501044?pt=Mess_Pr%C3%BCftechnik&hash=item3cda0075f4About 330$Hantek:http://www.ebay.co.uk/itm/Hantek-DSO4102B-USB-Oscilloscope-100MHz-Bandwidth-500MSa-s-/221341485149About 350$So right now i got like 3-4 scopes i think about the rigol ds1052e that you can upgrade to 100mhz is nice but i wonder how the hantek dso4102b would perform if itwould be worth buying the hantek dso4102b or if i should just go for a rigol ds1052e but the siglent looks nice too and the dso4102 looks like it is new on the marketso it might be full of bugs so either rigol or siglent then any opinions?

author: echen1024
author_rank: Super Contributor
timestamp: January 02, 2014, 11:36:53 pm
content: $300-600? Rigol DS1000Z series without a question. 4 channels for 450 euro from German Batronix is the best deal you can find.http://www.batronix.com/shop/oscilloscopes/Rigol-DS1074Z.html
MOVED: NEWBIES, YOU'RE SCREWED (AKA, Forum Search doesn't work half the time) - Page 1
Forum section: electronics / testgear

author: Simon
author_rank: Unknown
timestamp: January 02, 2014, 07:50:58 pm
content: This topic has been moved toGeneral Chat.https://www.eevblog.com/forum/index.php?topic=24553.0
I think I destroyed a thermocouple... - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: January 03, 2014, 04:28:12 pm
content: I was experimenting with my Analog Devices AD8497 thermocouple amplifier, and had been using an ExTech one I purchased for around 10 bucks at my local frys. It said it was rated to 250 Celsius, so I decided to bake it at 180C in a toaster oven to try it out. The temperature never reached above 220, and now the TC won't read any temperature. The cord is a little bit browned on the top. Do you think it is the thermocouple that broke or the chip?

author: TiN
author_rank: Super Contributor
timestamp: January 03, 2014, 04:34:53 pm
content: Check resistance with usual DMMIf it is more than few ohm - it's open.To fix thermocouple you need welder or something which can melt to metal tip back together.I often use bunch of 10000uF caps charged to 5-25V tozap thermocouples.

author: echen1024
author_rank: Super Contributor
timestamp: January 03, 2014, 04:44:51 pm
content: The kind folks at extech decided to send me a new one.
Rigol 2000 Series and calculating audio amplifier THD  - Page 1
Forum section: electronics / testgear

author: Pierre_Montreal
author_rank: Newbie
timestamp: January 03, 2014, 07:01:09 pm
content: Hi there,I just want to know if it is possible with just the FFT feature of the Rigol DS2000 series scopes to calculate the THD of a audio amplifier. Do we have the exact peek values of the harmonics and enough harmonics to calculate a decent value for the THD. I can't afford a Spectrum Analyser.I saw a video 'Testing harmonic distortion' using a Tektronix DPO3034 with the Power Analysis Application Module very interesting but far too expensive.Also is Rigol making an oscilloscope with similar harmonic measurements feature ?Thank you, bye.

author: Wim13
author_rank: Frequent Contributor
timestamp: January 03, 2014, 07:42:23 pm
content: You can better use LabMon or something like that ,a LF spectrum analyser for the PC with a audio card.You can do then very precise measurement to calculate the THD.I use for this purpose always freeware software for the PCOn the low cost scoops the scale is not fine enough to make measurementsbetter then few dB om harmonics.
Meguro MCS-7600 Centralised Sweep generator system - Page 1
Forum section: electronics / testgear

author: kiwitrike
author_rank: Newbie
timestamp: January 02, 2014, 07:11:07 am
content: Hi all. I may be the only one with one of these units in captivity. I purchased it recently and all appears to be ok. However, I can find no documentation regarding operation or maintenance. Housed in a 19" standard rack cabinet - 8 units including monitor scope with specific markers for 455KHz (5 markers), 10.7MHz (5 markers) and a series of units covering the HF band and 88-108MHz. Apparently came from a factory and is in very good condition. However it was missing the output/input cables although all internal cables are present. So any help with documentation would be greatly appreciated. Meguro's contact eml address has been down for a number of months so no help there. Regards. Gary. ZL2AKI
Oscilloscope, measure thyself - Rigol DS2072 AC current waveshape - Page 1
Forum section: electronics / testgear

author: Circlotron
author_rank: Super Contributor
timestamp: December 12, 2013, 11:34:26 am
content: Just looking at the current waveshape of the mains power going into the scope, and seeing it is a normal SMPS inside without any PFC, (or at least that is what it appeared to be in Dave's teardown video) I'm a bit surprised the waveshape is as good as it is. After this test i grabbed a battery charged for my electric screwdriver and had a look and it was much more like I expected. Actually the leading edges are a bit spiky, but anyhoo.Anyone got any comment on how the scope's waveform is better than what you would normally expect from a SMPS?

author: Ghydda
author_rank: Regular Contributor
timestamp: December 21, 2013, 04:28:52 pm
content: Well the pfc-inductor and 450V storage capacitor is easily spotted in the frame grab attached.I am a little puzzled to why you missed what I so easily spotted.Anyway, this goes a long way to explain the waveform you've captured - which despite the pfc input stage still looks plenty rich in harmonic content.Cheers/Ghydda

author: Circlotron
author_rank: Super Contributor
timestamp: January 01, 2014, 12:49:11 pm
content: Hi Ghydda, thanks for that. Yeah, I must have been daydreaming during the teardown video.What surprises me though is that they would bother to do PFC for such a low powered supply. My cheap and nasty wattmeter showed 28 watts going in so I didn't think regulations for PFC applied to stuff that low in power.

author: peter.mitchell
author_rank: Super Contributor
timestamp: January 01, 2014, 02:02:00 pm
content: They do it because these are often not used in a home environment, so if used in a industrial/commercial lab, with lots of other smps, sure 28w may not be much, but if you have 50 28w non-pfc devices, you'd be pretty piss-poor. And these are the people who get charged based on aparrent power, not real power too.

author: Circlotron
author_rank: Super Contributor
timestamp: January 01, 2014, 10:36:16 pm
content: My worst power factor story is back in '90-'92 I worked for this company that imported and sold a line of standby UPSs. The Taiwanese manufacturer decided to branch into on-line UPSs. Their first offering was a 240V 3kW unit that took incoming AC mains into a 2 diode, 2 SCR controlled rectifier and then STRAIGHT INTO a 3300uF 450V cap. NO INDUCTOR! We measured a power factor of 0.3 with a strong assymetrical (DC) component. Unbelievable.
Tektronix Oscilloscope Probe Alignment tool. - Page 1
Forum section: electronics / testgear

author: youbecha
author_rank: Contributor
timestamp: January 01, 2014, 03:18:27 am
content: I have a 6139A probe that needs a bit of adjusting...but no tool was included.I peeked in the adjustment hole to see what kind of tool it takes, and I can't figure out if is a screwdriver or socket wrench.Screwdriver won't touch it.What does the alignment tool end look like, and what can I substitute?Thanks.

author: sachleen
author_rank: Contributor
timestamp: January 01, 2014, 03:30:36 am
content: This page has some info on it:http://www.csus.edu/indiv/t/tatror/EEE_117_Lab/3017_Test_Equipment/Tektronix%20P6139A%20Probe.pdfSCREWDRIVER:ADJUSTMENT TOOLTektronix part number: 003--1433--02

author: pickle9000
author_rank: Super Contributor
timestamp: January 01, 2014, 04:00:22 am
content: The tool itself is in most cases plastic. If you happen to have a set of tv adjustment tools (as they used to be called) you should be able to find what you need. Other than that you will need a chunk of plastic rigid enough to act at the bit and file or carve it into the correct shape. Try the plastic shaft off of a childs water-paint brush. But don't let the kid catch you.

author: youbecha
author_rank: Contributor
timestamp: January 02, 2014, 01:58:40 am
content: Thanks all, I found Cal Test Electronics CT3648 Deluxe Oscilloscope Probe Trimmer Tool (of course only in quantities of 10...) Its reference sheet says it replaces that Tektronix part...we shall see...
TEK TDS320 power supply faulty? - Page 1
Forum section: electronics / testgear

author: jalves
author_rank: Contributor
timestamp: January 01, 2014, 12:24:16 am
content: Hello all, I am needing help.I own for some time a Tek TDS320 (bought used but functional), but after some time in the bench without use (or mains) I turn it on yesterday to find that the unit initiate the power on, do several clicks from the relays inside but can't conclude the power on (sometime it does, after a minute or two of clickings).I open the oscilloscope and try to check the unit, measured the voltage output(s) of the power supply and when the Tek is working, all the voltages are ok and in accordance with the service manual.The problem arises when during the clicking, the delayed power up, the 5V rail maintain an oscillating value of about 2.9V, with the other voltages also on the low side.BUT if I remove the ribbon that goes to the monitor board (nominal 15V) the Tek power up without problems except the monitor is off.Now my doubts, who is the culprit, the Power Supply board or the monitor board?I am leaning towards the PS board, but don't know what to do next.The service manual isn't of much help.What do you think?

author: PedroDaGr8
author_rank: Super Contributor
timestamp: January 01, 2014, 02:20:06 am
content: It could be the drain from the monitor is pulling a marginally failing power supply out of spec. When you disconnect it you lighten the load. I'd still suspect the power supply. I seem to engender though some of these TDS models are known for failing electrolytic caps.Sent from my EVO using Tapatalk
MESR100 V2 Test with known good cap, then the same cap made 'bad' - Page 1
Forum section: electronics / testgear

author: Eisenstein
author_rank: Newbie
timestamp: December 30, 2013, 01:47:08 am
content: Please forgive me if I am violating any protocols or such for these forums, as it is my first post.I have recently received an MESR100 V2 from China as an ESR meter after my Peak Atlas ESR70 was stolen while along with a whole mess of other tools on a train.It has tested well so far but out of curiosity I decided to try an experiment. I would take a known good cap and make it 'bad' by hooking it to my bench supply with reverse polarity with a OCP of 20mA and upping voltage until it shut off, then testing the ESR again.Here are my results:Results before reverse-polarity volting:23.15uF on the LCR1.14R on the ESR (in-spec)Results after:no LCR test because it doesn't have protection against charged caps and I didn't want to possibly damage it. Will update later2.6R on the ESR (out of spec!)Youtube video:http://youtu.be/yyPbCntJlc8Imgur album:http://imgur.com/a/prvvzHope this maybe proves interesting even if it is somewhat pointless.
Agilent DSO1022A / DSO1024A "Made in Switzerland"? - Page 1
Forum section: electronics / testgear

author: Dankoozy
author_rank: Contributor
timestamp: December 29, 2013, 12:34:42 am
content: Hai guysMost sites seem to suggest all the 1-series scopes from agilent are rebranded Rigol scopes with firmware made by Rigol on them yet on Farnell scopes such asthis oneare supposedly made in Switzerland. Now I'm just wondering how Rigol the 1024a really is? EU/USA based companies have been known to put the last screw in a Chinese-made product in Europe, or carry out some other token "manufacturing" effort on it in Europe to dodge import tax.Do these also run the infamous same firmware that contained Rigol in plaintext, and hasn't seen an update since 2010?

author: Bored@Work
author_rank: Super Contributor
timestamp: December 29, 2013, 06:16:09 am
content: You know, my theory is someone at Farnell got it wrong when adding the item to the database.What he was supposed to do was to select "CN China" as country of origin, but happened to select "CH Switzerland".

author: PA4TIM
author_rank: Super Contributor
timestamp: December 29, 2013, 08:39:06 am
content: On the Agilent brochure downloaded from your link there is a picture from the back of the scope. It is a bit hard to read but as far as I can see it states made in China (it is to short for made in switserland)

author: Macbeth
author_rank: Super Contributor
timestamp: December 29, 2013, 08:07:33 pm
content: I would trust the Chinese to produce a good 'scope over the Schweiß. What are they going to make it out of other than mechanical watch gears made of gold & cheese with holes in, all inside underground mountain factories (with holes/tunnels in), secretly bankrolled by WW2 holocaust victims and the current 1%'ers and African dictators?Also no chance to hack the 'scope beyond 70MHz. That will fall foul of safety laws, and open you up to insane fines based on income.
DG1022 -vs- DG1022U (received the latter) - Page 1
Forum section: electronics / testgear

author: Cranium
author_rank: Newbie
timestamp: February 12, 2013, 07:40:40 am
content: I recently purchased a Rigol DG1022 waveform generator from a vendor Amazon. When I opened the box I discovered a DG1022U instead. Default language was Mandarin. Instructions were all Mandarin. It took a bit of fiddling to figure out how to change the language to English.Should I be concerned about receiving this model? Anyone know if I will have warranty support in the USA if there is an issue? I put in an email to Rigol but haven't heard back yet.I plan on sending it back because if the DG1022U has no differences or concerns, I will just purchase this directly from China and save $100 from the Amazon price.Thanks for any feedback.

author: Bored@Work
author_rank: Super Contributor
timestamp: February 12, 2013, 06:51:24 pm
content: The original DG1022 also only had support for two language, Chinese and Chinglish.If I didn't lose count, then the DG1022U is at least the fourth hardware revision. DG1022 ver. 1 hardware, DG1022 ver. 2 hardware (a silent, incompatible update), DG1022A (slightly higher frequency), and now the DG1022U. Since there were some incompatibilities in the past I wouldn't assume the U is a 100% replacement.

author: Cranium
author_rank: Newbie
timestamp: February 13, 2013, 03:50:58 pm
content: I just got off the phone with Rigol here in the US and brought up the issue.He did confirm that the unit is not being sold in North America.He also stated that if it were sent in for service, they would not honor the warranty and would charge for any service that the unit needed.The advertised specs of the DB1022U are the exact same as the DG1022A. Internally, who knows what is different though.So bottom line is that I am sending this back and now have to decide if I want to save $100 by buying another directly from China with the understanding that I will not have a warranty.

author: alyque
author_rank: Contributor
timestamp: December 30, 2013, 03:26:38 pm
content: Hi there,We just selling DG1022U at amazing price, you can find it here:http://www.diyertool.com/rigol-dg1022u-function-waveform-signal-generator.htmlBest wishes!Chen
"Arcing" between Oscilloscope and Stereo System - Page 1
Forum section: electronics / testgear

author: rentner
author_rank: Regular Contributor
timestamp: September 30, 2013, 06:49:49 pm
content: I wanted to hook up my oscilloscope to the stereo system hooked up to my computer.The Stereo System or amplifier is not grounded, but the Audio Input is grounded over the PC Soundcard. The oscilloscope of course is grounded aswell. I did measure the Voltage difference between the stereo amplifier output and the oscilloscope ground and input pins in all thinkable combinations and did not get any difference other than 5mV over the 2 Ground points, which can happen in a ground loop. But why did it arc or short, when I hooked up the Vin of the oscilloscope to the Vout of the amplifier? How can that be without noticeable potential differences?

author: con-f-use
author_rank: Unknown
timestamp: September 30, 2013, 07:21:25 pm
content: After you measured, you might have changed cloths or rubbed on something -> electro static discharge. Did anything break?

author: rentner
author_rank: Regular Contributor
timestamp: September 30, 2013, 07:23:55 pm
content: It is working all fine. I don't know why, but after switching the pins, no short circuit happened again, so even I don't know why, it is working now. No Idea, what the problem was. Just 1 combination of input shorts out everything - and that without music playing so without any potential.

author: Galaxyrise
author_rank: Frequent Contributor
timestamp: September 30, 2013, 07:27:21 pm
content: I presume you measured the dc potential; I suppose there could have been an AC potential that looked like near 0 to a DC voltmeter. But since the probe tip should be high impedance to everything else, I find it more likely that you touched two things together that you didn't mean to touch.

author: Bryan
author_rank: Frequent Contributor
timestamp: September 30, 2013, 07:41:36 pm
content: http://youtu.be/xaELqAo4kkQ

author: rentner
author_rank: Regular Contributor
timestamp: December 28, 2013, 10:05:55 pm
content: Bryan: That Video does not explain this. I am well aware of it! If no music is applied, I have 0V at the Output. And GND is 0V. Oscilloscope GND is 0V and Oscilloscope GND is high impedance. So none of all compinations CAN actually cause a short. 3 Cables have 0V and one is so high impedance, that even 500V would not let it spark.But that issue is fixed anyway.
Teardown: Wandel & Goltermann TKL-5 (vintage TTL-probe) - Page 1
Forum section: electronics / testgear

author: Heiko Wagner
author_rank: Newbie
timestamp: December 29, 2013, 10:55:22 am
content: Hello!My name is Heiko and i am from Germany. I've subscribed the youtube videoblog now for a few months and Dave inspired me to do a teardown myself.As i don't do videos, i have only fotos from it.As in the subject, the object, which i took apart is a vintage TTL-probe from Wandel & Goltermann. I think its from the late '70s/early '80s, as one TTL-chips productiondate is week 39 in 1978.Here the pictures together with scans from the manual and circuitdiagram:front:backside:to open it, just remove the tip and push the thread to the inside:here the disassembled probe:Now the circuitboard from the component side:and the soldering side, where also some parts are:now closeups on the parts:first the TTLs:as we see, one hex inverter (7404) and one monostable multivibrators with schmitt-trigger inputs (74121). As mentioned above, the 74121 dated week 39 in 1978.now the passive components:and finaly the 7-segment LED a Monsanto MAN-10 (*duck & cover*):closeup of the MAN-10:and powered up:and finally the circuitdiagram, which is dated 6.77:Maybe there is someone, who knows more about it, because i don't find anything about it on the net.Releasedate, quantity, retailprice...in the attachment there is the full manual, the curcuitboard and parts list with some more infos.Hope you like itgreetings from Germany,Heiko
Lutron LCR-9183 RS232 interface - Page 1
Forum section: electronics / testgear

author: freakymart
author_rank: Newbie
timestamp: December 28, 2013, 07:33:46 pm
content: Hi,I have LCR meter Lutron LCR-9183 (http://www.instrumentcatalog.com.au/brands/k-l/lutron/lutron-lcr-9183) and I want to connect it to a computer. I don´t want to spend money for cable and software. Especially for a cable because it´s just mono jack on the one side and CAN9 on the other. I though, that I need at least three cables for RS-232 serial communication. I know how to monitor serial communication between two devices with a third one (like herehttp://airborn.com.au/serial/rs232.html), but I´m not sure if I can use it in this application... When I push a button o meter to start a transmission (RS-232), I can´t see anything o scope. So I´m not sure, if I don´t have to start communication from computer. Is there any way how to do it without buying the original software?Anyone can help? Thanks.Jary
Upgrade Rigol Firmware - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: December 25, 2013, 07:32:45 pm
content: Anyone know how to upgrade the Firmware on the DS1000Z? I can't seem to find it in any of the menus, nor in the manual.

author: danb35
author_rank: Contributor
timestamp: December 25, 2013, 08:23:49 pm
content: If it works like the DS2000 series, you put the update file on a USB stick, name it DS1000Update.GEL, and plug it into the scope. The scope should detect the upgrade file and ask you if you want to install it.

author: echen1024
author_rank: Super Contributor
timestamp: December 25, 2013, 10:44:06 pm
content: OK. Thanks. It was a RAR file. That's the problem.

author: AndreaEl
author_rank: Contributor
timestamp: December 25, 2013, 11:50:05 pm
content: .rar is a archieve format. Just decompress it.http://en.wikipedia.org/wiki/RARYou can use WinRar, 7-zip. There are a lot of software for ecompress .rar file

author: dtran11
author_rank: Newbie
timestamp: December 28, 2013, 04:57:33 pm
content: Quote from: echen1024 on December 25, 2013, 07:32:45 pmCan you show me where I can download the latest firmware for DS1074Z? Thanks
DSA815 Autotune Accuracy - Page 1
Forum section: electronics / testgear

author: jstarr
author_rank: Regular Contributor
timestamp: December 27, 2013, 10:21:34 pm
content: Both my DSA815 and DG4062 are enabled with external reference (Thunderbolt GPSDO 10Mhz freq standard). On getting familiar with the DSA815 i noticed that regardless of the input frequency from the DG4062 that the Autotune function always sets me to a RBW of 300kHz and Span 10Mhz and the CF or Peak-CF leaves me always off by exactly +16,666 kHz. This is true for any frequency from 10-150mhZ. I know the Freq readout accuracy requires sufficiently narrow Span and small RBW but the Autotune error is so consistent I wonder if there is an internal calibration to improve it? I have run the auto-calibrate without improvement and the equipment has been on for hours. This +16666 error is consistent from day to day... so is there some internal adjustment possible?Happy New Year to all.john

author: iDevice
author_rank: Regular Contributor
timestamp: December 28, 2013, 01:37:42 pm
content: Same here, don't worry.It probably has something to do with the step width used to scan the full span when the autotune function searches for the highest peak.This search has to be performed quickly so these steps are quite coarse and probably the result of a simple binary counter, converted to floating point.Autotune is meant to "find something to display quickly" not to make any accurate measurement, it just put you approximately there and then it is up to you to decide how you will setup the analyzer's parameters to best suit your intended measurement.Same thing for the span and RBW, these default settings are used whatever autotune finds probably because they are the most susceptible to display something meaningful.So, it's pretty much normal and has nothing to do with calibration error.Besides, if you just do a peak detection marker, you will see that it is spot-on the freq +/- 1 digit.
Rigol DG1000Z Availability - Page 1
Forum section: electronics / testgear

author: Attorney
author_rank: Regular Contributor
timestamp: December 06, 2013, 01:17:48 pm
content: About a month ago, I ordered a Rigol DG1062Z AWG from a large on-line vendor. The ship date seems to keep moving further out with no other information available from the vendor, nor Rigol. Has anyone who has placed an order actually received theirs? Thanks!Paul

author: Frost
author_rank: Regular Contributor
timestamp: December 06, 2013, 03:31:20 pm
content: Quote from: Attorney on December 06, 2013, 01:17:48 pmI ordered mine yesterday at batronix.com and got the shipping confirmation today.So hopefully I will receive the generator tomorrow or Monday.

author: susu
author_rank: Newbie
timestamp: December 28, 2013, 08:16:31 am
content: Quote from: Frost on December 06, 2013, 03:31:20 pmPlease help me to comment on it

author: wilheldp
author_rank: Regular Contributor
timestamp: December 28, 2013, 02:43:19 pm
content: I ordered one from Tequipment last week and it shipped the next day (although they didn't show any in stock on the product page).
quantum sigma quantum spectrum software question  - Page 1
Forum section: electronics / testgear

author: Buzz239
author_rank: Contributor
timestamp: December 26, 2013, 01:59:30 pm
content: Hi Everyone,My Rigol DSA815 TG Spectrum Analyzer came with software called "quantum sigma and quantum spectrum (PC) installer". I looked for a write-up and found none. Does anyone know anything about these programs?Thanks, Gary

author: iDevice
author_rank: Regular Contributor
timestamp: December 26, 2013, 10:50:09 pm
content: I guess you mean "Ultra-Sigma" and "Ultra-Spectrum" ?

author: Buzz239
author_rank: Contributor
timestamp: December 26, 2013, 11:07:15 pm
content: Thanks,Sorry I had too many windows open for reference. I guess I'll ask over at the Rigol site.Gary

author: Buzz239
author_rank: Contributor
timestamp: December 27, 2013, 07:33:33 pm
content: In case anyone is interested, I got a reply from Rigol."UltraSigma gives you a free program to control the instrument remotely using single commands. UltraSpectrum is an additional software package that gives you full front panel control of the instrument remotely. You probably don't need either, but they help if you are making automatic measurements or wish to present live information to a classroom."Gary
add a DC off to a square wave signal - Page 1
Forum section: electronics / testgear

author: abbeyroad
author_rank: Newbie
timestamp: December 27, 2013, 09:04:39 am
content: I want to apply voltage like what it show in the picture. (35V DC offset+ 5V 100Hz square wave modulation)I use a power supply to output a DC, connected to a function generator. I could find an application as the link below, but donnot quite understand how to treat the BNC connector and how to connect wire.http://www.home.agilent.com/agilent/editorial.jspx?ckey=356756&id=356756&nid=-11143.0.00&lc=eng&cc=USAnyone who has experience in this application could help?

author: Neverther
author_rank: Regular Contributor
timestamp: December 27, 2013, 10:23:01 am
content: Looks like normal connection with floating outputs to me.DC carrier positive is connected to the negative of the function gen, then the 5V from function gen just adds up to the carrier when referenced to the negative of the DC supply.Works only if the equipment is floating, the picture there has the function gen floating (only 1Mohm connection to the ground, therefore the gound is not shared as the DC supply negative has direct short to ground).
Radio Shack Multimeter 22-206 - Page 1
Forum section: electronics / testgear

author: mcgyver2822
author_rank: Newbie
timestamp: December 24, 2013, 09:09:25 pm
content: I am looking for a replacement on-off switch for this meter..Does anyone know where I can get one???..Mike

author: retiredcaps
author_rank: Super Contributor
timestamp: December 24, 2013, 10:43:55 pm
content: Too bad you missed this auction that ended recently.http://www.ebay.com/itm/151189446394Brand new for $5.99.

author: echen1024
author_rank: Super Contributor
timestamp: December 24, 2013, 10:44:45 pm
content: Just buy a new one. Or get one for free at Harbor freight if you're in USA.

author: Mark_O
author_rank: Frequent Contributor
timestamp: December 28, 2013, 08:43:47 am
content: Quote from: retiredcaps on December 24, 2013, 10:43:55 pmActually, it was 20 bucks, with shipping. So $5.99... not so much. The OP simply wanted a replacement switch for a working unit. $20 isn't really a reasonable suggestion.

author: Robomeds
author_rank: Frequent Contributor
timestamp: December 28, 2013, 02:17:32 pm
content: Quote from: Mark_O on December 28, 2013, 08:43:47 amRetiredcaps is in Canada so he likely can't see the shipping price for a US buyer.

author: Mark_O
author_rank: Frequent Contributor
timestamp: December 29, 2013, 03:25:35 am
content: Quote from: Robomeds on December 28, 2013, 02:17:32 pmThanks, Robo.I didn't realize that.(and apologies to retiredcaps)
What exactly does a scope do during self-cal? - Page 1
Forum section: electronics / testgear

author: Phaedrus
author_rank: Frequent Contributor
timestamp: December 27, 2013, 09:20:13 pm
content: As the title. What exactly are the parameters calibrated, and what do most scopes use for their references? Also, how frequently should you self-cal?

author: Psi
author_rank: Super Contributor
timestamp: December 28, 2013, 01:05:22 am
content: I imagine it depends on the scope in question, but they likely connect the reference signal (maybe the one on the front panel terminal) to the channel inputs with relays. Then measure the frequency and voltage on each input range/timebase and compare to intended value then adjust cal values if needed to match them up.They probably also have a 2nd higher frequency reference too, since the one on the front is only 1khzMore expensive scopes have more complex self-cal tests.

author: sync
author_rank: Frequent Contributor
timestamp: December 28, 2013, 01:11:11 am
content: I think the most common adjustment is the DC offset. On the DS1000Z you can see this in real time. The traces are displayed during self-cal. No square waves are used, only varying DC.

author: eV1Te
author_rank: Regular Contributor
timestamp: December 28, 2013, 01:44:23 am
content: Quote from: sync on December 28, 2013, 01:11:11 amYep, I noticed this to, maybe you can connect a second scope to the input and "read" the voltages on the BNC during self cal.I would imagine that the only thing that needs calibration is DC offset and DC gain (on all of the vertical scale positions separately).

author: Phaedrus
author_rank: Frequent Contributor
timestamp: December 28, 2013, 07:42:15 am
content: Cool. I use a TDS 3014C at work, and self caled it earlier this week. Probably doesn't make a huge difference for me, since 95% of my work is in the <20V, <20MHz zone. But it's good to know.The Tek seems to do a lot of DC test modes, but also runs what look like sin waves and a couple other patterns, and also runs with nothing on the screen for a few minutes. Whole thing takes about 15 minutes I'd reckon.
Hantek Software? - Page 1
Forum section: electronics / testgear

author: Jon86
author_rank: Frequent Contributor
timestamp: December 25, 2013, 10:26:29 pm
content: So my new little toy, (Hantek 6022BE) claims to have 'Waveform Display: port/line, waveform average, persistence, intensity'Does anyone know if this is actually there in the software? And if so, where the hell is it?Really, I want averaging and persistence because the noise is so high.I probably should've bought a real scope, but lack of money led me down this route... I like the scope, it does the job, but I'm finding a distinct lack of functionality on the software side.

author: Fraser
author_rank: Super Contributor
timestamp: December 25, 2013, 10:55:09 pm
content: There is a good thread on the 6022be on this forum. Please do a search and you should find it.Much discussion on the performance, noise reduction mods and software there.Update: Here is the link....https://www.eevblog.com/forum/testgear/hantek-6022be-20mhz-usb-dso/Also look here:https://www.eevblog.com/forum/testgear/hantek-6022be-20mhz-usb-scope-review-ish/msg314213/#msg314213and herehttps://www.eevblog.com/forum/testgear/hantek-6022be-will-it-work-for-me/msg258526/#msg258526

author: Jon86
author_rank: Frequent Contributor
timestamp: December 25, 2013, 11:41:18 pm
content: Sorry I completely forgot about those threads, I've seen them before so I don't know why I didn't think to post it thereThank you!

author: Fraser
author_rank: Super Contributor
timestamp: December 26, 2013, 12:51:15 pm
content: No worriesI am hoping that better software will be written for the 6022BE. It deserves better than the Hantek 'effort'.
Stark OSK-3 Scope running Youscope - Page 1
Forum section: electronics / testgear

author: sonnytiger
author_rank: Frequent Contributor
timestamp: December 27, 2013, 02:24:58 am
content: http://youtu.be/P9vgXkrZGRQI have already done a video on this relic, you can find a link in the description (teardown, overview, etc.).It looks alright, kind of fuzzy, probably just due to the age of the device and the fact that it was not a super precision instrument even in its day.If anybody has any answers to the questions I ask in the video, telling me in the comments or here would be awesome.Thanks!
Power Designs HV1547: Source for HV Cable with BNC Connector? - Page 1
Forum section: electronics / testgear

author: junior marbles
author_rank: Newbie
timestamp: December 26, 2013, 07:24:57 am
content: I just bought a POWER DESIGNS HV-1547 High Voltage Regulated DC Power Supply on eBay:http://www.ebay.com/itm/POWER-DESIGNS-HV-1547-High-Voltage-Regulated-DC-Power-Supply-1-3000V-40MA-/281230254196It is missing its output cable, and my search for a high voltage connector with cable has been fruitless so far. I would be quite happy with a used cable, but cannot seem to locate one. Can anyone steer me to a source?Thanks in advance,JM

author: owiecc
author_rank: Frequent Contributor
timestamp: December 26, 2013, 09:46:44 am
content: Look for a cable with SHV connectors. HV PSU manufacturers (Glassman, Hivolt, ...) should have them in stock.
Is the DS2072A hackable? The answer is YES - Page 1
Forum section: electronics / testgear

author: sorin
author_rank: Frequent Contributor
timestamp: December 13, 2013, 08:13:21 pm
content: Is the DS2072A hackable??Anyone try to hack this?RESOLVEDPlease flow the instructions:https://www.eevblog.com/forum/testgear/sniffing-the-rigol's-internal-i2c-bus/msg381123/#msg381123

author: Rigby
author_rank: Super Contributor
timestamp: December 13, 2013, 08:58:24 pm
content: Probably hackable, but no one has really tried, yet. Step 1 is to get a firmware dump of the A model, but no one (that I know of) has done this yet.

author: nimp0u
author_rank: Newbie
timestamp: December 26, 2013, 12:36:53 am
content: A have an DS2072A and i want to get it hacked. How can i create a firmware dump?
"Free" analog oscilloscope in San Diego area - Page 1
Forum section: electronics / testgear

author: DavidDLC
author_rank: Frequent Contributor
timestamp: December 26, 2013, 05:10:12 am
content: If you live in San Diego area and need a free oscilloscope this is for you:http://sandiego.craigslist.org/csd/zip/4258802567.htmlThe person claims is for free, but he is asking for a tip or something like that.David.

author: turbo!
author_rank: Regular Contributor
timestamp: December 26, 2013, 05:16:19 am
content: Quote from: DavidDLC on December 26, 2013, 05:10:12 amReason for selling/giving:Saving for a digital notepad.. Fishy. Try to get it for free and he's just gonna tell you I've had a guy offer me (the amount he wanted to ask for originally).
Any buzz about a MSO from Rigol ie MS2000 or MS1000Z-S? - Page 1
Forum section: electronics / testgear

author: cidcorp
author_rank: Unknown
timestamp: December 25, 2013, 12:49:48 am
content: Has there been any concrete buzz about any new upcoming Entry Level Mixed Signal Scopes on Rigol's horizon? I've been considering purchasing the Z-S series just to get the 4 channels (well and Function Gen) I wanted when I originally purchased my DS2102 when it came out (but unfortunately they were only available in 2 Channel).But *before* I go and drop the money I wanted to see if maybe I should hold off for another few months in anticipation of a Mixed Signal version of DS2000 (with 4 channels?) or aMixed signal version for the DS1000Z-S?Just wanted to see if anyone had any advice.Also if the DS1074Z-S is currently 'hackable' with it's options, I'm wondering if I should be concerned about this going away in new versions of the firmware. I couldsimply forget about the Mixed Signal part (use my Logic 16 as I currently do) and be happy with the extra 2 channels.Chris
TRIO CS-1566A 20mHz Oscilloscope manual? - Page 1
Forum section: electronics / testgear

author: Dr Nick
author_rank: Newbie
timestamp: December 25, 2013, 08:02:22 pm
content: Hi I'm trying to get hold of a manual for the TRIO CS-1566A 20mHz Oscilloscope. Can anyone help me here?

author: sachleen
author_rank: Contributor
timestamp: December 25, 2013, 08:13:01 pm
content: See if this helps:https://www.eevblog.com/forum/chat/looking-for-manuals-and-schematics-for-a-'scope-bench-psu/
LEM UNIGOR 350 - Page 1
Forum section: electronics / testgear

author: Ebivetar
author_rank: Contributor
timestamp: December 24, 2013, 11:51:05 pm
content: Hello folks!I am new here, was reading the forum before but just registered few hours ago.I stumbled upon LEM UNIGOR 350 DMM.It is well built professional DMM. Terminals shutter to prevent wrong connection of the test leads.But, this is are all specs for now. I have tried googling but i cant seem to find specific info regarding this multimetter.If some one here can let me know the specifications i ll be really thankful!Just to note that LEM was Austrian company that in 2006 ( i think so) was bought from FLUKE.

author: david77
author_rank: Frequent Contributor
timestamp: December 25, 2013, 12:05:33 am
content: Can't find anything either, just from the looks of the Unigor 380 I'd guess these meters were made by Metrawatt or under licence of them. I'm supposing the 350 looks similar.Unigor was used as name for a series of meters by Goerz who after a few mergers became Metrawatt. AFAIK Metrawatt never used the product name Unigor themselves.Apparently LEM took over the Austrian company Norma, why they would choose to sell Metrawatt meters I don't know. They used to have theit own very nice range of DMM's, apparently mostly sold by Siemens. The German Post office traditionally bought their gear from Siemens, they used huge numbers of these meters made by Norma/LEM but rebadged as Siemens, like this onehttp://www.radiomuseum.org/r/siemens_digital_multimeter_b1023.html

author: Ebivetar
author_rank: Contributor
timestamp: December 25, 2013, 12:16:27 am
content: Yes, it is similar to the 380 but has less features.I ll post pic tomorrow in the morning.
AlphaLabs High Resistance Meter - Page 1
Forum section: electronics / testgear

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: December 18, 2013, 02:20:22 pm
content: I have a few products from these guys and have to say they are really decent. I am looking at the HR2 which is a low current High Resistance meter capable down to 1 pico amp. The HR2 measures from 1 ohm to 1.9999 Tera ohms (1.9999x1012 ohms). It can actually measure higher (Up to 100 TOhms) using the conductance range all the way down to .01 pS. Has anyone used this unit or have any experiences with it?http://www.trifield.com/content/high-resistance-meter/

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: December 23, 2013, 07:30:41 pm
content: I decided to order this meter. After a few initial tests, I am very pleased with the results. The specifications are very impressive, and the accuracy is better than expected. I compared it to my Agilent Bench DMM and My Fluke 289 up to there specified max ranges and the unit was dead on! The unit will effectively measure up to 100TOhm or .01pS. which is the closest the equipment can differentiate from a perfect ideal insulator. I can tell you this, you MUST use the shield box and any additional shielding and grounding possible when measuring values around or over 100GOhm. The currents are so low that any stray noise can cause it to become unstable. They recommend placing the entire unit and shield box into an enclosure much like a faraday cage when measuring very high resistance values. These are easy to build. However, I was able to measure a plastic USB cap with a stable reading using the shield box and grounding which was a little over 10TOhm calculated from a conductance of a little over .1pS.. I was able to repeat this measurement in various locations in my lab. With a price tag at around $400.00 dollars, this is quite an impressive Electrometer (High Resistance - Low Conductance) Meter. I am trying to locate some very high resistance references to test it more thoroughly. The unit came factory calibrated which is dated and initialed and is good for 1 year.Here is the link to the specifications.http://www.trifield.com/content/high-resistance-meter/I will update with more test info when available.
Tek TDS700D PSU debugging - Page 1
Forum section: electronics / testgear

author: darkstar49
author_rank: Frequent Contributor
timestamp: December 23, 2013, 11:29:39 am
content: Hello,First of all: I'm not an electronics engineer... I'm used to test/work with embedded boards, but PSU design/debugging is definitely not my specialty !A Tektronix TDS754D of mine recently started to make a very (very !) loud cracking noise, so I pulled to power line immediately. Any attempt to power the scope (even in stand-by) produces the same loud cracking sound...My first question would be: what the hell can produce such a loud cracking noisei.e. what type of component ?? transformer, capacitor ('don't think so...), inductance, etc...The problem is of course that debugging a switching power supply is not simple, especially when no load is present (I took it off the scope), and there's no doc from Tek on the subject... (I assume their engineers would know, or did once know..., what jumpers to short in order to 'simulate' some load, but I don't have that info.Any hints/ideas/suggestions are more than welcome !!Kind regardsPhilippe

author: AndyC_772
author_rank: Super Contributor
timestamp: December 23, 2013, 12:50:02 pm
content: Have a search around for "TDS520B Component Service Manual". There's a schematic in there which is probably very similar to, if not exactly the same as, the one in your scope.If you get completely stuck I do have a working TDS754D for sale - drop me a PM if you're interested.

author: nctnico
author_rank: Super Contributor
timestamp: December 24, 2013, 02:51:10 am
content: I'd start with disconnecting the cable to the monitor unit. Chances are the monitor unit got bad.

author: casinada
author_rank: Frequent Contributor
timestamp: December 24, 2013, 07:11:54 am
content: You can probably download service manuals from Tektronix directly:http://www.tek.com/oscilloscope/tds794d-manual/tds500d-tds600c-tds700d-tds714l-service-manualJust register and download.Crackling sounds could be High voltage CRT discharge (bad connection) or switching power supply (but that is more like a chirping sound)

author: AndyC_772
author_rank: Super Contributor
timestamp: December 24, 2013, 08:31:55 am
content: The service manual is worth having but doesn't go into component level detail. it's a common complaint about this model, lack of servicing information.

author: tautech
author_rank: Super Contributor
timestamp: December 24, 2013, 09:31:00 am
content: QuoteCRO's usually have several critical voltages.Signal circuit levelHV supply for tube(usually stepped up via switchmode to around 2KV witch in turn is quadrupled or quintupled for UHV)UHV for PDA is often 10 KV or more and that will make a crackling sound is leaking from around the Anode connection or cracked UHV lead. Be sure to discharge this lead if you have to check it out.Heavy dust loading and a humid environment can cause this leakage. If nothing has popped just a good clean can fix it. There maybe some carbon from any tracking and this will need to be cleaned up.