hybridfree/eevblog-posts huggingface dataset:
HANTEK HDG1022A sample code? - Page 1
Forum section: electronics / testgear

author: sjsmith274
author_rank: Newbie
timestamp: June 13, 2013, 05:42:50 pm
content: My company just purchased a new HDG1022A function generator. It works fine in stand alone mode. Using the RS232 interface I can make the included .exe program work (with fidgeting). But I would like to write a BASIC language code and/or operate the unit with a dumb terminal application such as the windows Hyperterminal session. I can't follow the command syntax to make this work, I.e. In a terminal session, 88RS232 does not engage the function generator. But with the Hantek .exe program, if I type this command in the user interface window, I can make it work. But Hantek gives no no source code, just the .dll drivers. Do you have a source code, or better, a BASIC example I could look at.With Regards,Steve

author: tinhead
author_rank: Super Contributor
timestamp: June 13, 2013, 06:25:41 pm
content: 1 -take it apart!Not a joke, i'm really curious what inside.2- they migrated server (into nirvana) , so maybe the link only broken (http://www.hantek.com/Product/HDG1000A/HDG1022A_SDK.zip)Create a ticket on hantek.org , they will respond if that was only broken linkBtw, this should be actually MFG3000CH from Gong Chang, Hantek is probably rebadged themhttp://product.ch.gongchang.com/d507418739.htmlTwintex TFG3500A should be exact the same DDS as well, but they have no SDK on their website :\http://www.twintex.com.tw/en-us/product/TFG3500ASeries.htmlEDIT: yeah, ATTEN ATFxxB seems to be the same as well, at least the same person wrote user manual for all thesemodels and marked them (as well as the drivers and PC application, lol) as MFG3000CH.

author: tijaybe
author_rank: Newbie
timestamp: July 22, 2013, 09:27:28 am
content: I have an Atten ATF20B . See attached main PCB pictures.Panel pictures to follow.

author: tijaybe
author_rank: Newbie
timestamp: July 22, 2013, 09:29:44 am
content: Front panel pictures.It has a JTAG connector.Some unpopulated areas.

author: sjsmith274
author_rank: Newbie
timestamp: August 02, 2013, 02:19:02 am
content: Thanks for the pictures, I have the RS 232 version, not the usb version of the HANTEK. The pc windows based software works, but I need some help to get it to run in remotely a terminal mode session, say windows hyperterminal.RegardsSteven Smith
curious case of the shuddering power supply... - Page 1
Forum section: electronics / testgear

author: SArepairman
author_rank: Frequent Contributor
timestamp: August 01, 2013, 11:18:10 pm
content: http://www.ebay.com/itm/HP-Agilent-Harrison-6268A-Rack-Mount-DC-Power-Supply-0-40VDC-0-30-Amps-PARTS-2-/111131332684?pt=LH_DefaultDomain_0&hash=item19dff1904cRead the description.What the hell could cause a power supply to shudder? I imagine that means it vibrated in a fierce manner.

author: ElectroIrradiator
author_rank: Frequent Contributor
timestamp: August 01, 2013, 11:49:26 pm
content: Quote from: SArepairman on August 01, 2013, 11:18:10 pmCurrent surge, like due to a huge short (and having nails instead of fuses). You sometimes see this during power-up in PSUs with huge filter caps, if the design lacks inrush current protection. See large class A audio amps with passive PSUs.
Hitachi V-222: My $50 Oscilloscope - Page 1
Forum section: electronics / testgear

author: jmc734
author_rank: Newbie
timestamp: August 01, 2013, 02:00:25 pm
content: eBay auction: #http://www.ebay.com/itm/181166528108Inspired by Dave's recent video, I purchased my first oscilloscope on eBay and just got it in yesterday. I had to give it a serious wipe-down. It came from a grungy physics department somewhere. Nevertheless, everything works except for the x5 gain on channel 2, which with some fiddling I can get it to works but it is very touchy. Overall, I am very satisfied with the purchase.The picture above is from the listing. This Flickr sethttp://flic.kr/s/aHsjHdoEYPhas some pictures of it after the cleanup.

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 01, 2013, 02:29:27 pm
content: Grats!Yes, the 'your first scope' feeling, too bad it can only happen once...

author: jmc734
author_rank: Newbie
timestamp: August 01, 2013, 07:05:37 pm
content: Finally lost my 'scope virginity. All my friends got their first test equipment in high school.
Philips PM3217 50MHz 2 channel CRO gutshots - Page 1
Forum section: electronics / testgear

author: KX36
author_rank: Contributor
timestamp: July 28, 2013, 09:34:30 pm
content: Hi,I was bored today so I decided to take apart my oscilloscope and see what's inside. It's a 'scope I got about 3 years ago on eBay for around £70 working but without probes IIRC. I didn't see any photos around and I know how everyone loves gutshots, so I thought I'd post them.The PM3217's a 50MHz 2 channel analog oscilloscope which has the interesting feature that as well as mains, you can power it from a battery (22-27V DC, 1.1A) - useful for situations which might otherwise need an isolation transformer.The most recent date code I found is 17th week of 1983.Vaguely interesting points (not all suprising, but interesting at least to me) are:-All through hole construction.-All discrete transistors! There are 6x 7400 series logic ICs and 5x NPN transistor arrays (2x CA3086, 3x SL3145), but other than that, it's all discrete bipolar transistors. Not even an opamp in sight.-Quite a few flying wires soldered directly to the boards.-The power supply is a push-pull coverter driven by bipolar transistors resonating at around 18kHz with minimal regulation. Rather than being supplied directly by the rectified mains though, this switching supply is supplied by a 24V secondary on a relatively heavy 50/60Hz mains transformer (or 24V battery). (I'm a bit of a power supply geek)-Just the retro look of the thing.I have a PDF service manual for it, but it's too big to attach here. I only got it from googling, so I'm sure you can find it if you want to see. It does have lots of info including schematics etc in it.Hope someone else finds this interesting!

author: free_electron
author_rank: Super Contributor
timestamp: July 28, 2013, 09:48:50 pm
content: amazing. almost 99% of the componbents in that machine are made by philips themselves. i only spotted a few RCA and TI chips like 3 or 4.. and the pushbuttons switches were bought too.anything else. including transformers, connectors, made philips...today ? philips doesnt make didly squat.. its all sold. how the big have fallen

author: ElectroIrradiator
author_rank: Frequent Contributor
timestamp: July 28, 2013, 10:03:20 pm
content: The worst part: They kept up this policy of making most everything themselves for decades. Open a piece of Philips vacuum tube equipment from the fifties, and it is the same story all over again. Philips parts everywhere, up to and including the tubes themselves.

author: vk6zgo
author_rank: Super Contributor
timestamp: July 29, 2013, 05:47:42 am
content: Yep,there were two ways of doing things---the Philips way,or the highway!

author: mzacharias
author_rank: Frequent Contributor
timestamp: July 31, 2013, 12:57:10 am
content: I have one of these scopes. Pretty nice, alright, but the controls were HORRIBLY noisy and furthermore very difficult to clean. Maybe not as bad in this respect as a Tektronix but give me a Kenwood-built B&K for serviceability any day.I will say that since cleaning the controls, they have stayed clean so far - about 2 years now.
Bought two used, cheap oscilloscopes, questions. - Page 1
Forum section: electronics / testgear

author: J-P
author_rank: Newbie
timestamp: July 31, 2013, 06:10:17 pm
content: Hello, I watched "EEVblog #498 - How to get a $50 Oscilloscope on Ebay" and started looking for used oscilloscopes.I never had an oscilloscope, I'm really an beginner at electronics, but I'm learning... I've used oscilloscopes though so it's not all new to me.However, this dude was selling this Kenwood CS-4025 20MHz, dual channel oscilloscope for 30 euros, (40 US dollars), I thought it was simple enough to get started with and cheap ofcourse, so I went to pick it up. When I arrived there, he had another oscilloscope, Iwatsu DS-8621 200MHz four channel and was asking 40 euros (53 US dollars) for it so I bought it too.So now I have two oscilloscopes... They both are supposed to be working and that's what it seems like, they had no probes so I have to buy them too.I couldn't really find anything about the Iwatsu oscilloscope. It seems fairly high end though. It also says "Storagescope" on it, what does that mean? Sorry if that's a stupid question, I'm just still a beginner.Is there anything I should know about these? Anything I should check?Thanks in advance.

author: jancumps
author_rank: Unknown
timestamp: July 31, 2013, 06:51:57 pm
content: Storage scope means that it can sample and store your input signals in memory.

author: KTP
author_rank: Frequent Contributor
timestamp: July 31, 2013, 07:04:04 pm
content: The 8600 series doesn't seem to be on their webpage but you might be able to get them to send you a pdf of the manual or possibly it is hidden on the site somewhere:http://www.iti.iwatsu.co.jp/en/products/ss/index.html

author: Unknown
author_rank: Unknown
timestamp: July 31, 2013, 07:15:33 pm
content: Storage scope can be both a digital storage oscilloscope (DSO), which samples the signals with an ADC, stores them in memory and then displays the digitized signal, or analog storage scopes. Analog storage scopes use a special CRT that can retain the image for a while. These are pretty much obsolete. I think this is a DSO. Tektronix's 'XYZs of oscilloscopes' primer provides some information about the differences between digital and analog scopes.Storage is useful for non-repetitive signals, for example turn-on behavior of a circuit. If you don't feel like flicking the power switch continuously, then storage is very helpful. Now digital (storage) scopes (essentially all digital scopes have storage), especially the earlier ones, also have disadvantages, so there may definitely be an advantage to holding on to both. And acquiring another dozen if you ask some people on this forum.
New UNI-T portable spectrum analyser UTS1000 - Page 1
Forum section: electronics / testgear

author: Wytnucls
author_rank: Super Contributor
timestamp: July 31, 2013, 07:34:52 pm
content: Looks like UNI-T has launched a portable spectrum analyzer which is quite similar in design to the Rhode & Schwarz FSH4.http://www.uni-trend.com.cn/cp-show.asp?yy=??&ProductNO=866I don't know if the specs are any good, but it will probably sell for a fraction of the price.

author: Fraser
author_rank: Super Contributor
timestamp: July 31, 2013, 09:45:08 pm
content: OH NO ! My bank account balance is in jeopardy !I need a decent portable SA and that looks like a nice design. I very much doubt that UNI-T make the internals as an SA is a long way away from their usual product lines and SA RF technology is a bit of a black art.... read expensive to develop from scratch.

author: Wytnucls
author_rank: Super Contributor
timestamp: August 01, 2013, 07:21:47 am
content: The company also makes a range of desktop analyzers, up to 3 GHz. They seem to be pushing the envelope in all directions, perhaps hoping to move into Rigol territory.I don't know if there are made in house, but there are few OEM manufacturers in China making such advanced equipment, apart from Rigol.
Do most probes have the spring loaded tips? - Page 1
Forum section: electronics / testgear

author: Stonent
author_rank: Super Contributor
timestamp: July 30, 2013, 04:10:06 pm
content: I've seen some probes for sale on Ebay where they show the end removed and there is the spring loaded tip, is that typical or do only certain probes have that feature? I was looking at these:http://www.ebay.com/itm/New-Two-100MHz-Oscilloscope-Scope-Clip-Probes-Kit-Probe-Super-Fast-Ship-From-USA-/160696019019?pt=LH_DefaultDomain_0&hash=item256a3aa84bBut this one shows specifically the end comes off and has the tip.http://www.ebay.com/itm/New-2x-100MHz-X1-X10-Oscilloscope-Scope-Clip-Probe-Tektronix-HP-BNC-Connector/171048975270?_trksid=p2047675.m1982&_trkparms=aid%3D333005%26algo%3DRIC.FIT%26ao%3D1%26asc%3D177%26meid%3D217734295429706283%26pid%3D100009%26prg%3D1088%26rk%3D1%26rkt%3D5%26sd%3D160696019019%26

author: Unknown
author_rank: Unknown
timestamp: July 30, 2013, 04:47:27 pm
content: What exactly do you mean with spring loaded tip? Common scope probes have a sharp pointy tip that is usually not spring loaded (there are exceptions, but these are usually the $100+ Agilent probes, not the $10 nonames). Probes almost always come with a removable witches' hat (retractable hook) which is spring loaded and features a hook that can hook onto test points / wires / components. I haven't seen any scope probes where the retractable hook is not removable.

author: Stonent
author_rank: Super Contributor
timestamp: July 30, 2013, 05:04:00 pm
content: Quote from: alm on July 30, 2013, 04:47:27 pmYeah I guess that's what I meant. I had thought the spring part of the hat was in the probe.So yeah I'm wanting probes with the hat and the pointy end.If they pretty much all come that way then I'll get some.
Measuring static charge with an electrometer?  - Page 1
Forum section: electronics / testgear

author: SArepairman
author_rank: Frequent Contributor
timestamp: July 30, 2013, 02:37:40 pm
content: Can an electrometer be used to measure static charge (since it measures coulombs). Like in the EEVblog video where Dave Jones has some sort of meter that measures surface charge (it has a round plate iirc).Is there some kind of attachment for common tri-axial connection electrometers?Since the input impedance is gargantuan (10^14 ohms, or 100 teraohms), could I just use regular voltage measurement mode and then a high voltage divider probe (1000:1), designed so that meter can read 35kV apparently, and touch stuff with a little disk (so it has greater surface area) to get a good charge reading?
Agilent 1660AS user manual? (oscilloscope section specifications) - Page 1
Forum section: electronics / testgear

author: SArepairman
author_rank: Frequent Contributor
timestamp: July 29, 2013, 11:21:44 am
content: So I am interested in the user manual for the 1660AS.I am curious about detailed specifications for its built in oscilloscope. I figure the 1660 manual will cover me on the logic analyzer part.

author: DRT
author_rank: Regular Contributor
timestamp: July 29, 2013, 02:50:46 pm
content: http://cp.literature.agilent.com/litweb/pdf/5963-2172E.pdf

author: SArepairman
author_rank: Frequent Contributor
timestamp: July 30, 2013, 02:22:29 am
content: thank you i missed that
Fluke 289 Question - Page 1
Forum section: electronics / testgear

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: July 29, 2013, 03:53:32 pm
content: I have a Fluke 289, does anyone know if the Fluke 289 will measure µ Ohms? I don't think it will, but I could be wrong.

author: IonizedGears
author_rank: Regular Contributor
timestamp: July 29, 2013, 04:12:58 pm
content: Just use the range button to manually look for a u? (sorry for using the different omega character, on my phone right now) range. Or perhaps a m? range that goes down to the 10 u? resolution.

author: quarks
author_rank: Frequent Contributor
timestamp: July 29, 2013, 05:20:58 pm
content: max. resolution in 50 Ohm LoZ range is 1 mOhm
Digital/Analog Proto Board Development Stations Help Needed With Docs  - Page 1
Forum section: electronics / testgear

author: Dawn
author_rank: Regular Contributor
timestamp: July 28, 2013, 06:24:10 pm
content: Here in the states, Global Specialties owns the university level educational system market as well as development labs for their integrated trainers/protoype boards with power supplies, function generators, etc. Sometimes these little sets beat the hell out of working with a passive board at a workstation with regular equipment. I'm more inclined to get to work on my kitchen table with my 30 yearold Heathkit 3400 development station because it's extremely convenient plus my spouse gets pissed if I disappear too long in my shop.There's a never ending supply of these units pulled from schools in non working condition for a fraction of the $500+ USD a new one commands. Problem is, there are no docs available from Global unless they release them to major contract purchasers. Auction sites commonly sell them in non-working condition for around 60-75 $USD or less primarly because of this.It's come to my attention that these are sold in the UK, OZ, & NZ in kit form under the names of :Cadet = Global PB-503Cadet II= Global PB-505They're made by two other companies that I know of and one was Techsoft in a kit form. I'd like to find at least a schematic of one of these, preferably one that has the bi state logic indicator with red and green LED's for high and low. Unlike most proto board kits that have just undedicated pots, debounced switch pairs, logic state indicators, and so on, these boards have a lot of "protection" buffering the outputs and protecting the circuits from student error. For example, the debounced switches aren't just the output of a 7400 like most kits, they're buffered by transistors. Other components have pico fuses such as the undedicated pots. The Cadet versions are white or some light color instead of the black sold in the states. Here's a link to the Global versions we have here. Maybe some of you might recognize one of them under another vendor's name.http://globalspecialties.com/electronic-trainers/analog-a-digital-circuit-design-workstation.htmlI'd love to see a print of either of these units and pick up one of them. I'd appreciate it if any of you guys across the pond have any access to some of these docs from a kit build or any other supplimentary circuit descriptions.Thanks in advance,dwt
getting the most from a gieger tube?: - Page 1
Forum section: electronics / testgear

author: SArepairman
author_rank: Frequent Contributor
timestamp: July 28, 2013, 12:13:29 pm
content: So what are methods from getting the most out of your gieger tube?I know that you can improve dead time by driving the input into a negative high voltage after a pulse is detected. Are there any other methods for getting more out of your tube?I'm guessing you can get some significant improvements if you switch in a negative voltage using a fast transistor.
Hameg HM303-6 probe calibration - Page 1
Forum section: electronics / testgear

author: albe
author_rank: Newbie
timestamp: July 28, 2013, 02:10:35 pm
content: Hi all,I am a newcomer to electronics and I wonder if I could seek advice on some questions on a second hand Hameg 303-6 that I have just purchased. Apologies in advance if the questions are numpty.1. The probe compensation process in the Hameg involves setting the Voltage/Div to 5mv/DIv and the Time/Div to 0.2ms/Div for the 1kHz square wave signal generated by the scope's internal generator. At these settings the top and bottom of the signal should cover 4 vertical grids. I manage to calibrate a probe on Channel 1 without any problem. With the same settings and the same probe on Channel 2 the signal only spans half that (i.e. 2 vertical grids). Is this normal settings? If not how do I align the Channel 2 Volt/Div sensitivity to that of Channel 1. The manual doesn't appear to touch on that.2. On the 1MHz signal, the rising and falling vertical side of the square wave is rounded but the probes doesn't have any R Trimmers to allow this to be adjusted. What does this translate to in practice.3. On 1 occasion the rising and falling verticals of the square wave (during the 1MHz calibration process) appear to be missing. Is this something to worry about?Many thanks

author: madires
author_rank: Super Contributor
timestamp: July 28, 2013, 04:26:54 pm
content: Quote from: albe on July 28, 2013, 02:10:35 pmIt should be the same for the second channel. Please check several voltages (lab PSU or batteries) with both channels. Is channel 2 still off by factor two? Just for a specific Volt/Div or for multiple?QuoteIt means that you should keep that in mind when looking at signals above 1MHz, i.e. the probe will suppress nice edges. Or that you should get some probes with low and high frequency adjustments ;-)QuoteIf that happens again change the Time/Div to a lower value to get more waveforms on the screen. If the rising/falling edges are still not visible try to increase the brightness, sometimes the beam is too week to show them. And don't forget to check the trigger settings.
Hacking Siglents - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: July 27, 2013, 08:30:30 pm
content: Has anyone here attempted to hack there Siglent CNL series scopes with any success to upgrade BW, etc...? Please let me know as my SDS1102CNL is set to arrive some time soon, and I would love to hack it.
Cheap digital scope! - Page 1
Forum section: electronics / testgear

author: Christopher
author_rank: Frequent Contributor
timestamp: July 27, 2013, 11:34:22 am
content: Guys,Looking for a cheap 2 channel digital scope. At least 50 MHz with USB so I can save snaps on a flash drive.Is the Rigol DS1052E still a good option? Or is there something a bit more 2013?I found a Siglent SDS1102CNL for £215 on ebay which looks good. It's only got 32kpts memory, but I cant see that being a massive problem?Will only be looking at some digital signals like SPI I2C so i won't need to look back that far, if I did i'd use the logic sniffer.

author: rf-loop
author_rank: Super Contributor
timestamp: July 27, 2013, 12:58:46 pm
content: Quote from: Christopher on July 27, 2013, 11:34:22 amSDS1102CNL have max 40kSDS1000DL models have max 32k (DL models have max 500MSa/s)SDS1102CNL In one channel use and if horizontal speed is so that it use 1GSa/s then it is 40k for this single channel. In other cases 20k for each channel.For very low speeds it have also 6M record memory (can use only low speeds (when scope is in scan mode). It can store continuous record.But be careful when you estimate memory needs.It is good to note that it also affect to samplerate.If you use example 100us/div and one channel.With "normal memory (20k)" samplerate is 5MSa/s and with LongMemory samplerate is 100MSa/sIf you look these sellers "specifications" note that there may be what ever mistakes (example this 32k) Many sellers do not know anything what they sell. They only resend cartons.

author: echen1024
author_rank: Super Contributor
timestamp: July 27, 2013, 08:29:01 pm
content: I would just go with the Siglent. I ordered one myself as well. Go on siglent's website, and here are the specs for it. It seems pretty good for the price. 330 USD for the scope, and free shipping via UPS. About the scope, 100MHz, 40KPt mem, 1GS/s sample rate, and good features.http://siglent.com/en/product/detail.aspx?id=100000004399111&nodecode=119008001
Rigol DS1000 Series (especially D) WFM files request - Page 1
Forum section: electronics / testgear

author: mabl
author_rank: Regular Contributor
timestamp: July 25, 2013, 06:24:00 pm
content: Hi all,for my WFM file parser library I'm looking for WFM files from all DS1000 series. Since the logic analyzer part is still missing, DS1000D captures would be most intresting.So if you have a RIGOL DS1000 scope, could you please post some WFM files, and the picture and "Parameter Save" exported in parallel during screenshot save.It does not matter what you capture, "esoteric" configurations are also welcome.This would be more than helpful to iron out the remaing bugs

author: mabl
author_rank: Regular Contributor
timestamp: July 27, 2013, 01:32:32 pm
content: Nobody?
Mastech MS5308 Question - Page 1
Forum section: electronics / testgear

author: Anson
author_rank: Regular Contributor
timestamp: July 26, 2013, 12:50:47 am
content: I just got my Mastech MS5308 LCR Meter and I am a bit confused. From what I have read most ESR meters test using a 100khz signal to allow in-circuit testing of caps right? Well I ma trying to use this meter set on capacitance and esr mode at 100khz and I am getting nearly always OL. And sometimes getting a reading that is very low value even on higher value caps. If I change the test frequency to 100 or 120hz many times I get a reading of 3.3 to 3.6mf. I am not sure what is going on.

author: elliott
author_rank: Regular Contributor
timestamp: July 26, 2013, 01:55:33 am
content: Most LCR meters can't do in-circuit tests. The Mastech has a test voltage of 500mV peak to peak, which can cause false readings due to turning on transistors, most testers capable of in-circuit readings are around 100mV. Keep in mind none of the in-circuit meters are particularly accurate either.

author: ddavidebor
author_rank: Super Contributor
timestamp: July 26, 2013, 02:03:51 am
content: On 100khz test voltage is lower, you can check with the scope.

author: Unknown
author_rank: Unknown
timestamp: July 26, 2013, 08:28:46 am
content: Measuring capacitance in circuit is not going to be accurate. ESR is usually slightly better, since you're only looking at orders of magnitude increases in ESR.

author: Anson
author_rank: Regular Contributor
timestamp: July 26, 2013, 02:50:30 pm
content: Ok makes sense. So in circuit testing I should only pay attention too the ESR reading. Should I always test in circuit at 100khz?Also a few other silly questions. When would you use DCR? What is wastage factor or D? And what is quality factor or Q? I guess I'll ask about phase angle also when does that come into play?

author: robrenz
author_rank: Super Contributor
timestamp: July 26, 2013, 04:01:54 pm
content: Download theAgilent impedance measurement handbookdon't worry about getting all the math just try to get the basics from it.

author: Anson
author_rank: Regular Contributor
timestamp: July 26, 2013, 06:14:00 pm
content: Thanks! Just what I was looking for.
Rigol DM3068 sceenprint .Net + general SCPI - Page 1
Forum section: electronics / testgear

author: KedasProbe
author_rank: Frequent Contributor
timestamp: July 25, 2013, 01:24:52 pm
content: Hi,Based on this basic example for .Net I started to change/build a new Application.https://www.eevblog.com/forum/beginners/rigol-c-net-ni-visa-example/msg154172/#msg154172This will show you the LCD screen on your PC every time you press the refresh button.I also updated everything else a bit. (default commands, text output format changed a bit.)I asked Rigol if it was possible to get the LCD matrix data and they said they had no such GUI software, only via ultrasigma.But UltraSigma was able to do it so there is a command for it (not documented for DM3068)I tried the same command as in their scope documentation :DISPlay:DATA? and this workedThe next-step maybe is to put a instrument photo in the background and make the buttons work based on mouse positionMaybe this type of app should be done in an App for an android tablet if possible.Note: continuous refresh doesn't really work, if you press the picture it will do it for like 6 seconds. (I limited it) but it freezes the controls during that time and I'm not really sure how to fix that without making it very complicated with threads, I'm not a programmeredit code update, save screenshot to png added.edit code update, stores not rounded .xdat values to .csvedit code update, continuously refresh works now. (click image), save format changed to .gif
Tektronix 455 peek inside - Page 1
Forum section: electronics / testgear

author: daqq
author_rank: Super Contributor
timestamp: July 25, 2013, 11:31:13 am
content: A long time ago I acquired a Tek 455 scope - a neat device. While repairing it I took a few photos and posted them on my page:http://www.daqq.eu/?p=85Enjoy.I especially like the delay line.
Alternative to Keithley 225 current source? - Page 1
Forum section: electronics / testgear

author: george graves
author_rank: Super Contributor
timestamp: July 23, 2013, 11:31:14 am
content: I was re-watching some of Dave's old videos - and thought that his Keithley 225 would be a good thing to add to my own lab.Unfortunately - I can't seem to find any for a decent price(what is a decent price?).Is there an alternative for a hobby/home lab? Something used for around $100-$150 would be great.Any recommendations?

author: edavid
author_rank: Super Contributor
timestamp: July 24, 2013, 04:07:08 am
content: Quote from: george graves on July 23, 2013, 11:31:14 amYou can get one for that price or less if you are patient.The most common alternative is an HP 6181B or 6181C.

author: madshaman
author_rank: Frequent Contributor
timestamp: July 24, 2013, 05:54:28 pm
content: Try this one:http://bit.ly/15g16tI(ebay link), it just went up for auction.

author: uoficowboy
author_rank: Regular Contributor
timestamp: July 24, 2013, 09:15:42 pm
content: Quote from: edavid on July 24, 2013, 04:07:08 amThe old HPs are very nice. I have a 6186C and it is a nice piece of gear.
New ATTEN DSO discovered - Page 1
Forum section: electronics / testgear

author: tinhead
author_rank: Super Contributor
timestamp: July 19, 2013, 06:19:47 pm
content: while playing with the GPL sources from Hantek DSO5000P series i found a boot logo (with recent date/timestamp) named ATTEN.So far nothing special, but yesterday while playing arround with latest firmware for these DSO5000P models i found lot of functions having at the end of name "_atten". I wasn't thinking any deeper about, but then remembered the bootlogo, so i oppened it and "boom!", i think discovered something.It looks like Tekway/Hantek is producing (or will soon do, heh, i hope i will not destroy the contract whith this posting) DSOs for ATTEN, look on the attached pictures!Sure, i already reported that they producing DSOs for other "manufacturers", like Protec, Voltcraft, AKIP, Zhongce, Falcon India, Aplab ... and of course all the best ISO9001 company ExtechBut ATTEN is a "wow effect", i always thought ATTEN was developing own gears before Siglent told me "no, they not, we doing it for them".What happened to the contract with Siglent (hello dear Siglent support, did you know anything?), i thought Siglent would produce for ATTEN for the next 100 yrs.Probably Tekway/Hantek will be bit pissed off now (the last time as i discovered the deal with Extech they stopped me for few months), but hey, it wasn't me again - you guys posted DSO5000P GPL sources together with all these bootlogos

author: echen1024
author_rank: Super Contributor
timestamp: July 19, 2013, 09:10:11 pm
content: From what I know, Atten doesn't produce anthing of their own...

author: MrAureliusR
author_rank: Unknown
timestamp: July 22, 2013, 03:27:41 am
content: Is it possible the _atten is for attenuation? Or some other suffix?

author: tinhead
author_rank: Super Contributor
timestamp: July 22, 2013, 09:24:27 am
content: Quote from: MrAureliusR on July 22, 2013, 03:27:41 amsure, the first thing i thought when i saw "_atten" was like you said.But the boot logo said everything, it looks like/for ATTEN, even the DSO naming looks like what ATTEN is currently using - ADS1102CAL

author: tinhead
author_rank: Super Contributor
timestamp: July 24, 2013, 02:37:56 pm
content: Hantek posted today new DSO5000P GPL sources link, no wonder, all ATTEN logos/includes has been removed ^^
RF Explorer PC Client Update - Page 1
Forum section: electronics / testgear

author: fpliuzzi
author_rank: Regular Contributor
timestamp: July 24, 2013, 02:10:40 pm
content: Hello,Ariel just released a fairly substantial update to the Windows PC client software for the RF Explorer handheld spectrum analyzer. Just thought that other fellow users of this device might want to check it out.http://micro.arocholl.com/index.php?option=com_content&view=category&layout=blog&id=3&Itemid=18Regards,Frank
Drieg - Awesome help. - Page 1
Forum section: electronics / testgear

author: orbiter
author_rank: Frequent Contributor
timestamp: July 23, 2013, 04:23:36 pm
content: Hi all,A bit of good news regarding theyellow/bluescreen scenario on my DS2072 scope.. Some of you may remember this from my posting in theSniffing the Rigol's internal I2C busthread as I initially thought that this may have been related in some way to testing option serials etc.Firstly though I would just like to say a massive.. THANK YOU, to EEVBlog memberdriegfromSilcon Electronics.Who sorted this out for me.The issue only started to rear it's head over the past few weeks or so when my new'ish DS2072 started to misbehave. Firstly (more on a cold boot,) it would show the rather worrying corrupt yellow/blue screen. Now thinking that this may have possibly been something to do with all the fiddling etc I'd been doing with option codes, I posted it in the earlier mentioned thread for some advice.Not long afterwards another very helpful memberWim13(Thanks Wim) contacted me and mentioned that drieg may be able to help with this. So off I trotted into the PM area and sent off a message explaining the problem.After a couple of emails back and fourth with drieg kindly pondering over the problem, he got back to me with the news that this was likely a BGA contact issue, especially as he'd had similar BGA type issues on a DS4 series scope.So.. Last week I posted the motherboard off to drieg, and within a week or so, I had a brand new warranty replacement motherboard returned, ready to be fitted into my scope, the board was also pre-programmed with my faulty boards serial number, and MAC address so that there would be no communication issues etc.Now all is well againThanks again very much indeed drieg for your help and awesome service.Kind RegardsJohn

author: Carrington
author_rank: Super Contributor
timestamp: July 23, 2013, 07:27:48 pm
content: I also bought my DS2072 to Silcon Electronics, and all perfect.I recommend this shop, also is an RIGOL authorized distributor:Silcon Electronics s.r.o.L. Janacka 91250601 JicinTel: +420 722 320 408http://www.silcon.czThank Drieg!Last edit: New phone number.
Is is normal for HP3478A DMM? - Page 1
Forum section: electronics / testgear

author: baoshi
author_rank: Regular Contributor
timestamp: July 23, 2013, 04:30:04 am
content: Hi,I'm negotiating to buy a HP3478A . The only picture I receive is below.Is it normal for a 3478A to show 1.9v reading when inputs are floating?ThanksBob

author: EEVblog
author_rank: Unknown
timestamp: July 23, 2013, 04:32:51 am
content: Yep, normal. That's the High-Z input.

author: baoshi
author_rank: Regular Contributor
timestamp: July 23, 2013, 05:27:04 am
content: Thanks.Getting it now at $105
Buy a DS2072 in AU to bring back to the US - Page 1
Forum section: electronics / testgear

author: mikepa
author_rank: Contributor
timestamp: July 24, 2013, 05:48:56 pm
content: I may be visiting AU in a couple of weeks and have been looking at the price of the Rigol DS2071 in AU compared to the US. Cheapest place I've seen for the DS2072 is on eBay direct from China for $1190 US dollars (free shipping).But in AU I see it's only $839 AU $, which is roughly $755 US $. I believe the GST is either not payable or will be refunded for export.Has anyone done this?

author: alank2
author_rank: Super Contributor
timestamp: July 24, 2013, 06:20:27 pm
content: You can get a DS2072 (not sure if they have them in stock) for $839 -6% at tequipment.com ($788.66)...

author: mikepa
author_rank: Contributor
timestamp: July 24, 2013, 07:11:16 pm
content: Thanksalank2. I see tequipment.net has them for $839 - is that the same place? How do I get the additional 6% off?

author: synapsis
author_rank: Regular Contributor
timestamp: July 24, 2013, 07:17:56 pm
content: Yeah, it's tequipment.net. That's where I ordered my DS2072 from.I wish I would've known something about -6% before I ordered the DS2072 and the DG4062!

author: mikepa
author_rank: Contributor
timestamp: July 24, 2013, 07:32:44 pm
content: Whats the deal with the -6% ?

author: mikepa
author_rank: Contributor
timestamp: July 24, 2013, 08:05:52 pm
content: OK I see the deal with the 6% now ... mention to TEquipment that you are a EEVBlog member. Thanks for the advice.

author: alank2
author_rank: Super Contributor
timestamp: July 24, 2013, 08:52:46 pm
content: All I did was start a chat with them and ask for it and they sent me a quote with the discount on it. Good luck!
Power Designs 2K-10 power supply teardown - Page 1
Forum section: electronics / testgear

author: LukeW
author_rank: Frequent Contributor
timestamp: July 22, 2013, 07:45:20 am
content: After watching too much EEVblog, etc, I have been inspired to make my own technology video.I don't pretend to be any video production expert, the video is just a crude job with me waving around a smartphone. This is not something I do professionally every day with lots of equipment and experience, so try not to be too harsh.This is a Power Designs 2K-10 0-2kV regulated DC power supply, 10mA Iout.I'm not sure exactly when it was made, but it's probably at least as old as me or a little older. Good quality stuff that has stood the test of time, though. It's US-made, and it's running off a 115VAC stepdown transformer in this video.Since making the video I have used a Fluke 1000:1 40kV voltage divider probe to measure the HV output on the 'scope, and the regulation is very good, with quite clean DC.A good little power supply for testing devices that require a bias on the kV scale at low currents - scintillation detectors and other technologies involving photomultiplier tubes were mainly what I had in mind, as well as Geiger-Muller tubes.And I got it for only 5 bucks! (it did require a little bit of love, such as cleaning out dirt and grime, replacing the fuseholder, mains cable and two of the neons, as well as the 115V stepdown transformer.)Edit: Helpful to actually include video.

author: saturation
author_rank: Super Contributor
timestamp: July 22, 2013, 03:48:34 pm
content: This is an excellent unit, thanks for the review. I've been toying with buying one as many remain on the eBay. I have an electrophoretic unit that generates up to 2-3kV, but its a SMPS, and its very noisy. But I use it only for destructive testing of dielectrics so cleanliness isn't required.
Rigol Ultra Sigma DM3068 communication breakdown? - Page 1
Forum section: electronics / testgear

author: KedasProbe
author_rank: Frequent Contributor
timestamp: July 22, 2013, 02:27:56 pm
content: Hi,I have some communication problems with the DM3068.I can for example take a few sceenshots, but then after some time (minutes) it stops working the DM3068 only gives a beep as soon as I give the command and gives a communication error.I don't know how to restore but after a few times it works again and then stops working again.The SCPI console keeps always working though. (just asking its ID as test)And the DM3068 WebControl works but nevers shows me a reading only "- - -" where the value should be.I assume it has to do with ultrasigma and drivers but I think I have all the latest versions installed.anyone experience with this kind of problem.I have Window 7 64Bit.example screenshots below + the error messageBTW I get the same error message if I try to take a screenshot of the DG4102 (but I don't know if that is supported)P.S. I just received it today, and still within the 90Days of calibration

author: KedasProbe
author_rank: Frequent Contributor
timestamp: July 23, 2013, 04:49:18 pm
content: I think I found the main reason of the problem.Hold on this is funnyYou maybe know that the DM3068 supports 3 command sets: (very nice of them)Rigol DM3068 Command SetAgilent 34401A Command SetFluke45 Command SetNow guess what happens when you start the WebControl interfaceYep it switches from Rigol to Agilent making some commands invalid.So the WebControl itself may also work bad because of that.Going to contact Rigol about this, maybe it is some default config file on my PC that needs changing.(just hoping)BTW they did gave me a small DSP update file of 2MB: (yesterday)QuoteBoot up time is about 16 seconds for those who care.(Warm up time much longer but you may not need the accuracy that soon)I will write a summary later about the DM3068. (not DM3058, has different functions)edit see:https://www.eevblog.com/forum/testgear/rigol-dm3068-issues-remarks-improvements-requests/msg388614/#msg388614
Philips PM-3218  Oscilloscope - Page 1
Forum section: electronics / testgear

author: Dellyjoe
author_rank: Regular Contributor
timestamp: July 03, 2013, 01:29:45 am
content: hello everyone im just starting out in Electrical Engineering and my mom's friend found out that im studying EE and he found this, witch i don't have any test equipment other then an BK precision multimeter so i picked it up.My questions are should i keep this? Is this a good one to still be using i know it is old.Here are some pics.

author: madshaman
author_rank: Frequent Contributor
timestamp: July 03, 2013, 02:27:31 am
content: Dunno, only thing that might limit you is that 35Mhz bandwidth. I'll bet it'll still show you decent signals up to 70+Mhz if you're lucky.I don't know what kind of circuitry you want to build, but if you'll be interested mainly in logic levels and you're not working with high speed digital, like 100s of Mhz, it might do you just fine for everything.Just my two cents.

author: c4757p
author_rank: Super Contributor
timestamp: July 03, 2013, 02:42:54 am
content: Beauty. You've even got a delayed timebase. 35 MHz is a bit low but you can work with it.

author: Dellyjoe
author_rank: Regular Contributor
timestamp: July 04, 2013, 02:59:46 pm
content: thank you everyone having a hard time understand what you are all saying. i just need to get my feet wet with everyone EE.

author: ElectroIrradiator
author_rank: Frequent Contributor
timestamp: July 04, 2013, 03:29:28 pm
content: For the love of [preferred deity], keep that thing!For sure it won't fulfill every oscilloscope need you may ever have down the road, but if it works reliably, then it is a great starter scope. Among other things, then it is kinda hard to accidentally burn the inputs out if you are unlucky with some connections, perfect for a beginner.More to the point: If you, as a beginner, is doing something that scope can't cope with, then you are probably inwayover your head.Also, once you do hit its limitations, then you will be in a much better position to judge what its successor should be capable of. In all likelihood you will decide to keep the old scope, as there are problems they still excel at, even when faced down by modern, kilobucks digital oscilloscopes.

author: Dellyjoe
author_rank: Regular Contributor
timestamp: July 04, 2013, 03:54:38 pm
content: Quote from: ElectroIrradiator on July 04, 2013, 03:29:28 pmThanks electroIrradiator im now reading the manual to find out how to use this thing.

author: mzacharias
author_rank: Frequent Contributor
timestamp: July 22, 2013, 02:00:14 am
content: The Philips analogs are decent but the controls get VERY scratchy and are difficult to get to to clean (but no worse than a lot of other brand scopes).I use a 50mHz delayed sweep Philips and a 25mHz basic model daily.Once serviced, no complaints. They were both over 20 years old when I got them.Definitely keep for now; it's considered that everyone needs at least one analog scope.
How are older Kenwood (Trio) 1980's scopes? - Page 1
Forum section: electronics / testgear

author: Stonent
author_rank: Super Contributor
timestamp: July 12, 2013, 01:12:44 am
content: I found what seems to be a decent deal on a Kenwood scope how are those in comparison to other scopes of that era?

author: rsjsouza
author_rank: Super Contributor
timestamp: July 12, 2013, 01:43:46 am
content: I have a CS4025 bottom of the range: 2-channel, 20MHz, nothing fancy. However, it is a workhorse and it is pretty good after almost 20 years of service.

author: TerraHertz
author_rank: Super Contributor
timestamp: July 12, 2013, 09:52:36 am
content: Ha ha, Stonent, stop dithering and buy it before someone else grabs it.Speaking of Trio/Kenwood scopes, does anyone know where I can get a schematic/service manual for a Trio CS-2110?It's my most-used scope. I've had it since the 80s; it has never had a single problem and still works perfectly. Which is why my lack of the service manual has never been a problem, and finding one is a chore that always sinks to the bottom of the heap.

author: nanofrog
author_rank: Super Contributor
timestamp: July 12, 2013, 04:33:03 pm
content: Quote from: TerraHertz on July 12, 2013, 09:52:36 amFWIW, found a site that sells .pdf downloads of the CS-2110 Service Manual for ~$5.00.http://www.dual.owner-manuals.com/CS2110-service-manual-DUAL.html

author: Fraser
author_rank: Super Contributor
timestamp: July 12, 2013, 07:52:38 pm
content: That is a link to a Dual record deck manual I believe

author: tinhead
author_rank: Super Contributor
timestamp: July 12, 2013, 08:42:02 pm
content: i do have Kenwood DCS8200, as well known as Trio DCS8200 (or in France as Sefram 5802/2). It is a very good piece of scope, sure 20MS/s when in digital mode, but it is still good 50MHz analog scope as well. A bigger brother of that scope is DCS8300, with 100MHz analog and digital bw and 40MS/s when digital mode enabled. They do have GPIB, but as well RS232 (and pen out! heh), so not a bid deal to get data from scope to PC.Btw, as it was broken (caps of course) i got within 2 days all the manuals from Kenwood Japan (actually fromTexio / Nikke Techno Systemswhich is ex-Kenwood TMI), that kind of service i knew only from R&S.

author: nanofrog
author_rank: Super Contributor
timestamp: July 12, 2013, 11:06:35 pm
content: Quote from: Aurora on July 12, 2013, 07:52:38 pmGenuinely thought "Dual" was just another label that model was sold under.

author: mzacharias
author_rank: Frequent Contributor
timestamp: July 22, 2013, 01:36:37 am
content: Kenwood made the BK Precision 'scopes such as my 1470, 1477, and 1540, and many other models up to and including one version of the 2190 series.Spend a little time on eBay and it's easy to see the family resemblance.Deals abound on the BK versions, and service literature easier to find.I've never seen one break though, except needing to clean some switches every few years.Decent little analogs 'scopes.
BK Precision 2709B Manual Error? - Page 1
Forum section: electronics / testgear

author: crab
author_rank: Newbie
timestamp: July 21, 2013, 12:32:51 am
content: I recently bought a BK Precision 2709B multi-meter. I tried measuring a few capacitors, but couldn't get an accurate reading with the meter. Themanualsays:QuoteIf I do this, it doesn't seem to measure capacitance at all. However, if I connect the red lead to the left-most port that has the picture of the capacitor, it seems to work. What's the deal? Is it a misprint?

author: tinhead
author_rank: Super Contributor
timestamp: July 21, 2013, 12:34:29 am
content: yes it is misprint