hybridfree/eevblog-posts huggingface dataset:
hey - can any one please give me the procedure of calibrating the 6632B ?  - Page 1
Forum section: electronics / testgear

author: eevblogfan
author_rank: Frequent Contributor
timestamp: April 24, 2013, 01:26:06 pm
content: heyI finally got my 6632B ! YAYso I guess the device is within spec , But I've noticed like 13mA of offset and 5mV ofset , so just for the sake of fun and learning , I'd like to know the procedure of calibrating , thank you in advance !BTW - KJDS . that supply came with broken plasticsdon't know what to tell you . wheter discount or IDKbut I bought okay device , you didn't mentioned me that he has some broken plasticsany way KJDS - Great seller after all - awsome communication fast replay , HUGE thumb up for that though

author: mikes
author_rank: Regular Contributor
timestamp: April 24, 2013, 01:30:56 pm
content: It's in the User Guide, which can be downloaded from the Agilent web site.

author: eevblogfan
author_rank: Frequent Contributor
timestamp: April 24, 2013, 01:36:04 pm
content: I seem not to find it - can you please link it here ? ( I did went and searched)

author: cyr
author_rank: Frequent Contributor
timestamp: April 24, 2013, 01:39:26 pm
content: http://cp.literature.agilent.com/litweb/pdf/5962-8196.pdfPage 59.

author: eevblogfan
author_rank: Frequent Contributor
timestamp: April 24, 2013, 01:47:35 pm
content: thanks !

author: KJDS
author_rank: Super Contributor
timestamp: April 24, 2013, 08:42:49 pm
content: Quote from: eevblogfan on April 24, 2013, 01:26:06 pmThanks for sending me photos of the damage. It wasn't shipped like that and I'm sad that you would even think that I would send you a damaged unit.What would you like me to do to put right the transit damage?
BK2790B@ 500V fuses  - Page 1
Forum section: electronics / testgear

author: Maciek
author_rank: Newbie
timestamp: March 22, 2013, 11:52:06 am
content: I skimped through the post about DMMs not compliant to their specifications and I am curious about not meeting CAT standards by the BK 2709B DMM. Following the manual part regarding input protection:"Input Protection 0.5 A/500 V & 10 A/600 V fast blow ceramic fuses".There is a comment in the post that the meter actually has 2x500V fuses so I am thinking if replacing fuses with 600V version will make it better. I noticed that some meters have their fuses spec'd like e.g. @0.5A/600-1000V & @10-15A/1000V. Does anyone tried swapping in 2809B?I am wondering if putting there 600V fuses will make other parts of circuitry blow. Is it a very serious issue? Ideal 61-342 has it marked as minor inconsequence and not following the specs. Thanks in advance for explanation.

author: tinhead
author_rank: Super Contributor
timestamp: April 24, 2013, 04:32:22 pm
content: i got 2709B with fuses exactly as described in manual -> 0.5A/500V and 10A/600V.

author: Lightages
author_rank: Unknown
timestamp: April 24, 2013, 05:59:39 pm
content: Replacing fuses with a higher voltage rating is never a bad idea. It doesn't not mean that the meter is now capable of a higher safety rating. It is more than just the fuses. In the case of the Ideal meter the fuse is rated very close to the CAT rating and so I deemed it less and issue than a meter that has little glass fuses rated for 250V when the meter is supposed to be rated for 600V+.A higher voltage rating on a fuse means it will reliably interrupt a higher voltage whereas a lower voltage rated one will possible still continue to pass current with a voltage applied higher than its rating. Higher voltage fuses are good things and cannot harm your meter.The BK 2709B had 500V rated fuses inside it with Dave's review (unless I read them wrong) so I prefer to leave this as a warning. It makes it even worse if the meter is being supplied with fuses less than specified on the manual.
HP 54645D Oscilloscope Trigger Problem - Page 1
Forum section: electronics / testgear

author: NickAmes
author_rank: Contributor
timestamp: May 05, 2013, 11:43:20 pm
content: I have an HP 54645D oscilloscope with a trigger system problem. The edge, glitch and pattern triggers don't work on the analog channels. It also fails the Trigger Hysteresis self-calibration.Everything else seems to work fine. The digital channels trigger properly, and the TV and line triggers work on the analog channels. It passes the self tests, as well as the first four self-calibrations (analog channel gains and offsets). Unfortunately, because it fails the Trigger Hysteresis self-cal, it won't save the results, so both analog channels have an offset.I've done some probing around the trigger area of the scope, but it's over my head. I haven't been able to find a schematic or CLIP (Component-Level Information Package) available online. There seems to be a problem with the channel 2 level comparator, but I'm not sure if that's the cause of the issue.Any information would be helpful, and I would be willing to pay money for a copy (even just to borrow) of the schematics for this scope or the 54645A.
keithley 2400 C power issue - Page 1
Forum section: electronics / testgear

author: richcj10
author_rank: Unknown
timestamp: April 24, 2013, 03:30:45 am
content: I have acquired this piece B/C it wasn't working. (nothing on the screen, no beep) I have found out that the AC in to DC (12v & 5v) is working but the 12V DC to AC to +-15, +-30, etc isn't.I think the problem is at the front end of the transformer. does anyone have the schematic?Thanks,Rick

author: MetraCollector
author_rank: Regular Contributor
timestamp: April 24, 2013, 10:12:30 am
content: As I know, schematics are not available, I was trying to find some for K2000 with no success.Anyway, service manual is available through G. and there are some flow chart for repairing these Keithley instruments.GL !

author: free_electron
author_rank: Super Contributor
timestamp: April 24, 2013, 03:04:50 pm
content: Most likely that big power hybrid is shot. On the bottom board there is an industrial power converter brick. Either a vicor or an ericsson. They are hard to find...

author: richcj10
author_rank: Unknown
timestamp: April 24, 2013, 03:09:07 pm
content: It works.I get the 12v and 5v out of it.I just discovered if I run my o-scope probe across one side of U3 (Main CPU)it will reset and turn on with a "No Com" error.
Tek OTDR uses? - Page 1
Forum section: electronics / testgear

author: krivx
author_rank: Frequent Contributor
timestamp: April 24, 2013, 01:41:33 pm
content: I saw a Tektronix OTDR on local eBay with no bids so I threw in a small bid out of curiosity over the Tek name - now I've found out I was the only bidder and have bought the unit at the starting price. The thing is I have no idea what to do with it, I don't do any work with optical fiber. Are there any interesting experiments I can do with this? Is it worth throwing back on eBay or looking for a sale or trade on here? Possibly send it off to someone who wants to do a teardown?It's this Tek FiberMinihttp://www.atecorp.com/ATECorp/media/pdfs/Tektronix-TFS3030_Datasheet.pdfand apparently it has the pricey dual wavelength option.
Thinking of buying Tektronix PS-2521G power supply  - Page 1
Forum section: electronics / testgear

author: eevblogfan
author_rank: Frequent Contributor
timestamp: April 29, 2013, 03:52:03 pm
content: heyIn my new Job I got hell lot of gear that is un-needed , today I stumbled some Tektronix PS-2521G in there ( and some 60V 30A Horizon ! ) the boss will sell it to me for less then 280$what is the overal opinion to that supply ? is it good quality ?does one of you can tell me - what is the ripple like ?Current riple and voltage and the on/of raise and fall time ?if you can tell me about the user interface as wellI know tek are good so no worries but still , Just asking you knowthank you in advance !

author: free_electron
author_rank: Super Contributor
timestamp: April 29, 2013, 07:53:18 pm
content: just a rebrand. tektronix, tenma , metrix, made in china somewhere .. long agothese things are old. they are plagued by two problems :1) the keypads become sticky / intermittent. you need to take the front off , clean the pcb with alcohol and apply a fresh coat of carbon on the membrane2) the output on/off is done by clunky relays. no softstart. these relays eventually go bad.another annoyance of these supplies is that there is no rotary dial. so if you need to play with a varying supply it becomes tedious ...i got a stack of those in the lab where i work. nobody wants to touch em anymore. they all got problematic keypads / bad relays and have fried many a board during poweron ( oh and you cannot control individual output on. it's all or nothing )

author: eevblogfan
author_rank: Frequent Contributor
timestamp: April 29, 2013, 08:00:08 pm
content: so it isn't worth 250$ ?well there was many .. so i'll see what eles i shall chek ...any suggestion for some good multy channel supply ?thank you
8714C Network Analyzer - Page 1
Forum section: electronics / testgear

author: wstech7
author_rank: Newbie
timestamp: April 22, 2013, 10:49:46 pm
content: Hello,I am trying to repair a HP 8714C network analyzer and was wondering if anyone might know where to find parts. I am looking for the A4 Source module, which I believe is identified with part # 08713-60004, 08713-69004, 08713-60051 or 08713-69051.Thanks
Frequency ot from a cesium atomic standard - Page 1
Forum section: electronics / testgear

author: ddavidebor
author_rank: Super Contributor
timestamp: April 22, 2013, 05:43:11 am
content: Hi to everyone.A simple question:-a cesium standard with a non-working tube, still have something near is nominal frequency on the output?

author: N2IXK
author_rank: Frequent Contributor
timestamp: April 22, 2013, 12:56:36 pm
content: Maybe, maybe not.The cesium tube is used in a feedback loop to control the output of a high quality ovenized quartz oscillator which actually produces the 10 MHz or whatever output signal. But whether the oscillator output is actually sent out of the instrument in the event of a failure of the feedback loop depends on how it was designed.A cesium standard is used in applications where the output frequency is of utmost importance. Making the unit output NOTHING in event of a control loop failure, rather than putting out a signal that is "almost right" would seem to be a reasonable design choice to me. A complete failure would quickly be noticed, where an off-frequency output might not be noticed for a while, and could cause problems for anything downstream.

author: ddavidebor
author_rank: Super Contributor
timestamp: April 22, 2013, 01:36:24 pm
content: So, i assume is possible because the oscillator still run...Thaks a lot...

author: N2IXK
author_rank: Frequent Contributor
timestamp: April 22, 2013, 02:07:46 pm
content: But you may need to modify the unit to get access to the signal straight out of the oscillator, if it goes through a error detect gate or similar circuitry before hitting the output jack.You would also want to find the control voltage input into the oscillator, and disconnect it. That way, the "off scale" output from the defective cesium tube/error detector isn't trying to push the OCXO frequency all the way in one direction. You could then "dummy in" a suitable control signal to make the OCXO think that the the frequency error is zero, which should give the nominal frequency output.

author: ddavidebor
author_rank: Super Contributor
timestamp: April 22, 2013, 02:33:39 pm
content: i don't have it in my hands so mine is only a teorical question.thanks a lot
does somebody know something about flexible current probe? - Page 1
Forum section: electronics / testgear

author: Jasmine
author_rank: Newbie
timestamp: April 19, 2013, 05:30:05 am
content: what's the difference between normal current probe and flexible current probe?can anyone explain to me ?

author: mazurov
author_rank: Frequent Contributor
timestamp: April 19, 2013, 05:00:07 pm
content: Flexible is often a Rogowski coil ->http://en.wikipedia.org/wiki/Rogowski_coil.Clamp-on probes can be Rogowski as well but more often they are split-core current transformer (sometimes combined with a Hall sensor to boost low-frequency response). There are also solid-core current transformer types.Define "normal" current probe.

author: Smokey
author_rank: Super Contributor
timestamp: April 19, 2013, 08:26:02 pm
content: http://en.wikipedia.org/wiki/Rogowski_coilwithout the .

author: Jasmine
author_rank: Newbie
timestamp: April 23, 2013, 08:30:07 am
content: Quote from: mazurov on April 19, 2013, 05:00:07 pmthanks
Extending probe-cable on Rigol DS1102 - Any advice - Page 1
Forum section: electronics / testgear

author: bob_60
author_rank: Contributor
timestamp: April 24, 2013, 12:13:58 am
content: Hi. I need to extend the probes about 2 meters. Does anyone have any advice on how to achieve the best result.I'm thinking about Coax - but what type (impedance) should I choose. And what about a terminator for the cable.The object to test, is running at about 10 - 20MhZ (5V).Any advice is appreciated./Bo

author: ben_r_
author_rank: Frequent Contributor
timestamp: April 24, 2013, 12:33:12 am
content: If you cant figure another way out, I use and recommend the modular series from Fluke as they have a lot of options including extenders.

author: amspire
author_rank: Super Contributor
timestamp: April 24, 2013, 01:00:29 am
content: Quote from: bob_60 on April 24, 2013, 12:13:58 amConventional scope probes are not designed to be extended.At 10 to 20MHz, you would be better off making your own 20:1 cable with a 1K input impedance. A 15pF x10 scope probe at 20MHz has an input impedance of 500 ohms, and a homemade 1K probe may actually work much better. probably better risetime.The cable is a good quality 50 ohm cable - whatever length you need - terminated with 50 ohms at the scope end. At the sensor end, you have a 950 ohm SMD resisistor in series with the inner core of the cable.

author: Psi
author_rank: Super Contributor
timestamp: April 24, 2013, 01:05:42 am
content: Quote from: bob_60 on April 24, 2013, 12:13:58 amManufactured scope probes use special resistive cable and the exact resistance is part of how the probe is designed. (Watch dave's recent video on the subject)Adding coax onto an existing probe will upset the characteristics.As said above, you need to make your own probe
Quick teardown - Kikusui PLZ 72W electronic load - Page 1
Forum section: electronics / testgear

author: reagle
author_rank: Unknown
timestamp: March 06, 2013, 01:59:58 am
content: Just posted a very brief teardown- mostly pictures of inside of the PLZ 72e- load.http://kuzyatech.com/kukusui-plz-72w-electronic-load-teardownSmall and all analogyy inside

author: saturation
author_rank: Super Contributor
timestamp: March 06, 2013, 01:43:02 pm
content: Very nice device. Kikusui are among the top eloads in the market, even the old ones are great and still command high prices on eBay.

author: reagle
author_rank: Unknown
timestamp: March 06, 2013, 02:44:18 pm
content: I snagged it for around $100, plus the new AC fan. Quite a nice instrument, though I am not sure I care for all the open point to point mains wiring!Unlike my Array 3710A, this can easily do pulsed load- a useful thing for power supply transient response testing

author: sorin
author_rank: Frequent Contributor
timestamp: April 22, 2013, 11:53:37 am
content: Do you have a schematic for this model?

author: reagle
author_rank: Unknown
timestamp: April 22, 2013, 12:24:54 pm
content: Nop, just a user manual link in the teardown
Agilent Mobile Logger App - Page 1
Forum section: electronics / testgear

author: MITTS
author_rank: Contributor
timestamp: April 21, 2013, 01:34:46 am
content: Anyone have experience with the Agilent Mobile Logger App?Will the graphing feature of multiple meters display in real time and not just off recorded data?Can you name or title the inputs or are they directly transferred values marked voltage current etc. ?

author: babysitter
author_rank: Frequent Contributor
timestamp: April 21, 2013, 07:48:06 am
content: realtime, the meters are named a b c and d. there is a fifth window where you can enter a function to calculate before plotting. units are kept.

author: MITTS
author_rank: Contributor
timestamp: April 21, 2013, 12:38:01 pm
content: Very nice. Thank you babysitter.
DIY Calibrate DMM's - Page 1
Forum section: electronics / testgear

author: johnny diaz
author_rank: Contributor
timestamp: April 20, 2013, 03:21:40 pm
content: Does anyone have any proven methods for DYI calibrating DMM's such as the Fluke 289 or Fluke 190-102 meter? I would like to confirm voltage, current & resistance values.

author: babysitter
author_rank: Frequent Contributor
timestamp: April 20, 2013, 03:46:22 pm
content: Yes, basically compare it to a known good-enough meter (reference) and write down the differences of the measurements with date and if possible temperature. That is calibration.Sources for good-enough meters:* Ask local electronics shops* Hobbyists/Ham radio ops* local school teaching electronics,* a very friendly but possibly expensive cal laband ask if they mind if you compare your own meter to theirs.On the other hand you might decide to go for buying a new meter which you trust to be good for you, which will act as your personal reference meter then. (threat it well)You will have it easier when you think about the interesting ranges you want to calibrate - comparing resistor measurements will be easy as cake, low-voltage, low current DC stuff too... AC values and high voltages or currents are a bit more complicated, but do you really need it ? If you have something which you want to measure, just take it with you and use your meter and the reference meter to measure it.I rarely use any AC, and never more than 400VDC.If possible, make or buy sources which will give you the values that you want to calibrate - a handful of resistors (1 or 2 for every range your meter has), a stable voltage source (buy a fluke if you are rich, a geller labs reference if inclined, or make one yourself) and combine U source + R to get a I source.And finally, know your meter ! It has a impedance in voltage measurement, and a burden voltage in I measurement !You can even go one step further and look if the service manual of your meter tells you how to adjust it.Try to make your "slave" meter reading approaching the value that the reference meter reads.After that, do the calibration as described above.Did this help ?BRBabysitter Hendi
Looking for a spesific tester - Page 1
Forum section: electronics / testgear

author: newnerd
author_rank: Newbie
timestamp: April 20, 2013, 06:38:09 am
content: I have been looking for a tester that I used to have, and it was stolen. Now I can't find another one. It is not real technical. but it works well. It was a lot like your standard 12 volt tester that has a needle point and an alligator clip on the wire. Clip it to a ground,, and when you touch a hot wire the light in the handle lights up. The big difference is tis one has an LED and if you touch a hot wire the LED lights up red, but if you touch a ground wire the LED lights up green. I don't remember what it was called. Everyone I ask has no clue what I am talking about. I think it was either a continuity or polarity tester, but that is it. Can any one either tell me what it is called or better yet where I can buy one. Thanks much for your time.
Extech EX430 multimeter teardown photos - Page 1
Forum section: electronics / testgear

author: Medo
author_rank: Regular Contributor
timestamp: April 18, 2013, 05:03:52 am
content: I took liberty to take apart EX430 multimeter (http://www.extech.com/instruments/product.asp?prodid=272).One curious thing that I noticed on board was existence of two beepers. It is either that or I am going crazy (or both)...Here are the images if anyone is interested.

author: Lightages
author_rank: Unknown
timestamp: April 18, 2013, 05:31:35 am
content: Thanks for the pictures. It looks like it is made completely different than some of the other EX series. How well does it work?It is obvious that it has minimal input protection. It certainly does not match its CAT ratings according to the latest CAT requirements based on the fuses.

author: retiredcaps
author_rank: Super Contributor
timestamp: April 18, 2013, 05:46:45 am
content: On the one Ihad, the backside of the COM jack already had a solder ring crack. It is hard to tell from the photos here, but mine was obvious.The EX430 overshoots a lot.When measuring a simply 9V battery, it would show 17.xy, then 9.06, then 9.05, and then finally settle, correctly, on 9.03.This would take 3 or 4 seconds.The local Canadian electronics store lists it for $109.99 CDN MSRP.

author: Medo
author_rank: Regular Contributor
timestamp: April 18, 2013, 07:50:27 am
content: I personally have mixed experience.I bought one for $60 on Amazon, which I think is quite a good price for what you get. Unfortunately, most probably due to really awful packaging, it arrived semi-dead. It acted funny while measuring temperature (room was freezing according to F and boiling according to C) and it didn't measure current at all. I returned that one and borrowed second for few days.Second unit is one on pictures and I was quite satisfied with it. Most of stuff I dealt with those days was on 3.3/5V and I haven't noticed any large overshoot. Maybe few counts but nothing as retiredcaps. All voltage measurements were spot on (within 1 count, compared to Agilant A1232) and current seemed close enough (I did some troubleshooting on live project so it was very had to get any stable reading).Capacitance was fairly close (based on sample of two) and frequency was much better than spec (at least on 4 MHz I measured it on). Temperature was within specs but with 3%+3C I have broken thermometers with better accuracy.There are few annoying things. Voltage/Common socket was ok, but I had feeling that probes would fall out from A/mA ones. They were just annoyingly wiggly inside. That is something I noticed on both devices I had. It is unstable when on tilting bail and screen gets all washed out. For me that one wasn't an issue since I almost never use titling bail but someone might mind. Backlight was just weird and it made display look very pixelated but that is probably quite subjective.All in all, I had dealt with better multimeters but I have dealt with worse also. I think that for $60-$70 it would be a good buy (assuming that it survives shipping).
Tektronix 2225 - No Horizontal B Mode Sweep!  - Page 1
Forum section: electronics / testgear

author: AcousticBruce
author_rank: Contributor
timestamp: April 17, 2013, 02:58:58 pm
content: I am not getting a horizontal B sweep. It seems to trigger most of the time. I demonstrate A mode first... then B Mode. To make this really easy. I did about a 1 minute video demonstrating the problem.Just a note: The demonstration is done with channel 2. I assure you that I tested channel 1 and it does the same.https://www.youtube.com/watch?v=IfTkgZURFi0Video is about a minute long and gets right to the point.Any Ideas? Am I doing something wrong?Is this an issue that you have heard of?

author: Resistoid
author_rank: Contributor
timestamp: April 17, 2013, 10:57:45 pm
content: I do not own one of these scopes, but I have seen similar effects on other scopes when the trigger is set to "EXT", while no external trigger is available. - You could check that your 2235 is not set for external triggering on B Sweep.Do you have a manual for this scope? - If not, let me know and I'll supply you a link where you can obtain one.Have you joined the "Tekscopes" group? - If not, let me know and I'll give you details. - There are many Tektronix scope experts over there who may be able to help diagnose and remedy this apparent malfunction.Resistoid.
Hantek DSO 3064A software - Page 1
Forum section: electronics / testgear

author: kermit
author_rank: Newbie
timestamp: April 24, 2013, 07:01:16 am
content: Hi all,I recently bought a Hantek DSO 3064A scope with with integrated DDS signal generator.It looked like a great piece of hardware that could do a lot when connected to a PC running the right software.However the software that came with the unit is nothing to get excited about and I am struggling to find 3rd party software to get the best out of my box.Has anybody written or found software that will drive both the scope and signal generator ?I am particularly interested in software that will analyse frequency response of filters and the like.What came with the unit doesn't even let me use the scope and signal generator simultaneously.Your help will be appreciated.Thanks
Anyone seen this bench PSU? - Page 1
Forum section: electronics / testgear

author: nctnico
author_rank: Super Contributor
timestamp: April 19, 2013, 07:49:58 am
content: I'm looking for a PSU with a small form factor. 60V would be nice but 30V will do and at least several amps at lower voltages. I was eye balling an Itech IT6720 (also sold by BK precision) but the review here revealed the load regulation and power-on rise time are beyond bad.I've found a different PSU (1V to 36V 3A) which is sold under different brands (Distrelec sells it as a Manson, Farnell has put a Tenma sticker on it). Has this one been reviewed before?

author: grumpydoc
author_rank: Super Contributor
timestamp: April 19, 2013, 08:34:23 am
content: Similar to the one Mike (mikeselectricstuff) did a review/teardown of.

author: nctnico
author_rank: Super Contributor
timestamp: April 19, 2013, 11:42:46 am
content: Thanks for the pointer. I've found the topic:https://www.eevblog.com/forum/reviews/tenma-72-8345-bench-psu-review/msg120307/#msg120307
Stark OSK-3 General Purpose Oscilloscope teardown - Page 1
Forum section: electronics / testgear

author: sonnytiger
author_rank: Frequent Contributor
timestamp: April 16, 2013, 01:31:32 am
content: http://youtu.be/r50sTg4emcoGot this fine piece of ancient equipment off of eBay for 50 bucks. Works, though I am not sure how accurate it is, probably not very.

author: Hydrawerk
author_rank: Super Contributor
timestamp: April 16, 2013, 01:07:31 pm
content: How old is that nice scope? 1968?

author: sonnytiger
author_rank: Frequent Contributor
timestamp: April 16, 2013, 05:49:38 pm
content: Well i took a guess in the video at around the 1960s but i have no idea couldn't find anything.
Tektronix 2211 - intermittent display (information) issues - Page 1
Forum section: electronics / testgear

author: AcousticBruce
author_rank: Contributor
timestamp: April 16, 2013, 03:01:12 pm
content: This scope has intermittent display problems. It seems to only mess up on the information portion of the screen. I posted a video so you can see exactly what I am talking about. When the vid startsit looks nasty and completely out of place. At about 1:30you can see that it popped In place.-I cannot find a service manual anywhere. I do have a 2212 service manual.-I would like to find the problem with the display-I think the digital storage displays the images too high and this may be out of cal also.It would be cool to hear of similar problems or find a manual and or get some help trouble shooting this.
Oscilloscope ads1102cml - Page 1
Forum section: electronics / testgear

author: illyesgeza
author_rank: Contributor
timestamp: April 16, 2013, 08:23:49 am
content: I'd like to know if this type of memory IS61LPS51236A-200TQLI is used in atten 1102cml (siglent 1102) digital storage oscilloscopethe problem is that atten specify 1G sampling rate for a 8 bit vertical resolutionso 36bit / 8bit = aprox. 44 * 200MHz = 0.8GHz (maximum 800 megasamples)what is wrong hire?1.) not this type of memory IS61LPS51236A-200TQLI2.) or not 1GSPlease help me!

author: rf-loop
author_rank: Super Contributor
timestamp: April 16, 2013, 09:17:23 am
content: With long memory, samplerate max is half. (500MSa/s)(this is very normal in many cheap DSO:s)Only short memory is full speed. (it is 40k or 20k + 20k)
How is Hantek MSO5102D oscilloscope/Logic analyzer?  - Page 1
Forum section: electronics / testgear

author: singera
author_rank: Contributor
timestamp: March 03, 2013, 08:06:58 pm
content: hey to all as describe at the subject how is that scope/Logic analyzer?eBay auction: #300825895779or should I buy Owon SDS7102 but without LA?http://www.saelig.com/PSBE1002/PSBE100008.htmthanksArnon

author: kripton2035
author_rank: Super Contributor
timestamp: March 03, 2013, 08:13:00 pm
content: ebay answer :Unfortunately, access to this particular item has been blocked due to legal restrictions in some countries. We are blocking your viewing in an effort to prevent restricted items from being displayed. Regrettably, in some cases, we may prevent users from accessing items that are not within the scope of said restrictions because of limitations of existing technology. Please accept our apologies for any inconvenience this may cause, and we hope you may find other items of interest on eBay.

author: Bored@Work
author_rank: Super Contributor
timestamp: March 03, 2013, 09:43:08 pm
content: Quote from: singera on March 03, 2013, 08:06:58 pmIt is the Tekway/Hantek discussed here on the forum ad-infinite, just with the additional LA.

author: Electro Fan
author_rank: Super Contributor
timestamp: April 16, 2013, 04:20:10 am
content: anyone know anything about the LA?

author: Electro Fan
author_rank: Super Contributor
timestamp: April 16, 2013, 04:29:32 am
content: I think I found the answer to my own question (go figure):https://www.eevblog.com/forum/testgear/what's-the-deal-with-logic-analyzers-on-scopes-(hantek-mso5102d)/msg215339/#msg215339

author: kripton2035
author_rank: Super Contributor
timestamp: April 16, 2013, 06:08:46 am
content: does not seems to have a serial decoder feature (i2c spi uart) ?only a brute logic "displayer" of 16 channels.overwise it's really cheap !
Rigol DG1022 troubleshooting - Page 1
Forum section: electronics / testgear

author: ceasar
author_rank: Newbie
timestamp: April 15, 2013, 04:33:48 pm
content: Hi!I've been reading this forum for quite a while, but this is the first time I am posting.I have studied electronics engineering, but I work in another field. I have not practiced electronics for many years, so I consider myself a begginer in the area.This blog however gave me the inspiration to get my hands on some electronic projects, although at a novice/hobby level.I bought a Rigol DG1022 waveform generator, described as malfuctioning, for next to nothing money.Its firmware version is 00.03.00.08.00.02.08.The mainboard version is ver. 2, rev. AThe unit seems to work fine and is in very good condition, apart from the fact that the LEDs that light the buttons on the front panel keypad seem to have a mind of their own.For example, when I press the ARB button, the Pulse key lights up, when I press the Cannel 1 output button the Noise key lights up, etc. The actual buttons work fine, doing what they are supposed to. Also, sometimes buttons blink without any keys being pressed.I am not sure if this is a hardware or firmware issue, but if I had to bet, I would bet on hardware. I tried to find another (or even the same) version firmware on the net, but no luck there. Is there any chance anyone has it or knows where I can find it? I also emailed Rigol support, but I recieved no reply.Considering it a good experiance-building exercise, I did some investigation on the front panel board of the unit. On it there are:2 HC595 8-bit shift register chips, which seem to drive the LEDs (15 LEDs in total, plus 1 for the Power On button which is wired independently and is the only one operating properly.2 HC4051M MUX/DEMUX chips which I think sense when a button is pressed1 HC393 Binary counter chip which I think is also used to control the buttons.The keypad board is connected to the mainboard via a 16-wire flexible cable. I traced the wires to be:1: Gnd,2: Gnd,3: Gnd,4: HC595 RCLK Pin (Storage register clock)5: HC595 SRCLK Pin (Shift register clock)6: HC595 SER Pin, (Serial input)7: Vcc,8:Vcc,9:Vcc,10:Vcc,11: HC393 1CLK, 2CLK pins12: HC393 1CLR, 2CLR pins13: PWR On Button,14: PWR On LED (This one works OK),15: HC4051M COM IN/OUT Pin,16: GndI took some scope measurments for wires 4,5,6,11,12,15 which i attach below.So, to sum up, my questions are:1. Do you think this is a hardware or firmware issue?2. Do these waveforms look OK to you (I am concerned mostly about RCLK and SER)?3. Any suggestions about what else I should check?A big Thank you to anyone having the patiance to read all this!
tektronix 2225 - still going strong? - Page 1
Forum section: electronics / testgear

author: bamboo
author_rank: Newbie
timestamp: April 15, 2013, 01:47:03 pm
content: I watched DJ's teardown of the tektronix 2225 CRO in 2011. I just wonder how it turned out in use? Has it proved reliable? Reason I ask is I am a fan of tektronix kit (great build quality) but in the past my tek 2215 proved to be a right PITA. The voltage tripler failed (£££$$$) but more difficult was the crazy "floating" psu. (Was in a world of its own) failed.I see from DL's video that the 2225 is a far superior design with basically a single board and a more conventional PSU.I have been watching ebay for one (am in the UK) and just now there are 2225's in Israel and the States only. I'm waiting in hope a good one will show up.

author: EEVblog
author_rank: Unknown
timestamp: April 15, 2013, 03:06:33 pm
content: Mine still works just fine. Have used in a recent video.
Owon SDS7102 OS X client software - Page 1
Forum section: electronics / testgear

author: bbum
author_rank: Newbie
timestamp: April 08, 2013, 04:34:27 pm
content: I picked up an Owon SDS7102 last week (the new version seems to address most of the criticisms I saw, it has a big display, and an ethernet port... and it was available, scratching my immediate gratification itch). As I plan on using it to write a series of weblog posts about hacking and trouble-shooting using the [holy cow! these things are cheap compared to 'scopes of 20 years ago! wow!] digital storage scopes, I wanted to grab screenshots and data over the LAN port.No surprise, there was no OS X software and documentation is lacking. However, it wasn't hard to figure out. End result is that I have code that can grab data and screenshots from the Owon scopes. It decodes a summary of the data right now and I'm working on full to-CSV export over the coming week or so.I'll be dropping it on Github under a liberal license (MIT). It should be easy to compile for iOS, too. If anyone is interested in it, respond here or ping me.The attached image was grabbed from the terminal with the command "ow net screen /tmp/screen.bmp" (and subsequently renamed).b.bum

author: AndrejaKo
author_rank: Frequent Contributor
timestamp: April 10, 2013, 05:42:44 pm
content: I was preparing to do something similar for Windows as a learning experience one of these weeks.If you'd be willing to share the link to the github repository, it would be great.

author: tgdavies
author_rank: Newbie
timestamp: April 15, 2013, 04:10:48 am
content: I have just got an SDS7102 and I'm interested in your software -- a bitbucket or github repo would be great.Best wishes,Tom

author: bbum
author_rank: Newbie
timestamp: April 15, 2013, 05:40:40 am
content: I've been meaning to push this out for a couple of days with some refinements, etc... yeah... didn't happen.So, here you go:https://github.com/bbum/owLet me know if you have any problems with it. Github bugs/feedback welcome (as is direct email).
Pace Solder station, connectors, and hand pieces - Page 1
Forum section: electronics / testgear

author: tommypro
author_rank: Newbie
timestamp: April 13, 2013, 03:58:35 pm
content: Hi All, I have a MTS200 Heatwise system. I bought a solder iron hand piece from ebay, and it has a blue connector, but my system has a black/red connector, and the blue won't fit. The black connectors have 6 pins, but the blue have 8. I'm not sure what the difference in black and blue connectors are (besides the blue not working on my system!).I was thinking about making a convertor from blue to black, but I can't seem to find the blue connectors. I think I found the black ones. There are no part numbers on any of the other hand piece tools I have, so I'm just guessing.Any ideas?Thanks.

author: quint
author_rank: Contributor
timestamp: April 13, 2013, 04:21:20 pm
content: Quote from: tommypro on April 13, 2013, 03:58:35 pmThe black connectors are for what Pace calls the SensaTemp (ST) system. This is used on their older equipment (as well as new). The blue connectors are for the IntelliHeat (IH) system which is for newer equipment. As you noticed, the two connectors are not interchangeable. I know that a new IH base unit can drive older ST hand pieces (Pace makes an adapter to go from ST to IH for around $20 IIRC). However, I don't know whether or not a ST base can drive an IH hand piece.QuoteAs I said, I don't know if it is possible to adapt from IH handpieces to ST base units. You could check the Pace website to see if they make an adapter. Also, I have found Pace support to be very quick to respond to questions. Send them an email and see what they say.
Desired specs/price for a low-cost/beginner's DSO - Page 1
Forum section: electronics / testgear

author: rps
author_rank: Newbie
timestamp: April 14, 2013, 03:56:19 pm
content: Hi everyone.I was hoping you could give me an idea of what you would consider the best specs a PC-based (USB) scope should have. I'm referring to a scope for the hobbyist crowd (Arduino, DIY, etc.). What do you think would be the ideal characteristics and price? Something cheaper than the common Rigol scopes (less than $300). What would be the must-haves? For example: BW, Samps/s, etc.? Something you would recommend to someone looking to get started in electronics but not wanting to spend anywhere near $300.Thanks.

author: Unknown
author_rank: Unknown
timestamp: April 14, 2013, 04:38:32 pm
content: I'm not aware of any sub-$300 PC-based scope that can compete with the old used analog scope. I think Dave's rant'Buy a real analog oscilloscope PLEASE'is still valid. All of the cheap USB-based scopes that I've encountered are still toys. This is not to say there are not some decent products out there. Some people are happy with the Picoscope products, for example. However, the cheapest 2 channel / 25 MHz model (not exactly impressive specs, even for an old analog scope) is already $400. USB-based scopes are also much less versatile than stand-alone scopes, whether digital or analog.Rigol, Owon and Siglent appear to have some decent entry-level DSOs. Below that, you have the used analog scopes.Some specs I would consider essential: 2 channels, 50 MHz bandwidth, 500 MS/s sampling rate, 10kpoints memory, vertical range from 5 mV/div to 5V/div, good software. This would have to be substantially cheaper than a real DSO, say $200 max.

author: Balaur
author_rank: Unknown
timestamp: April 14, 2013, 04:51:54 pm
content: Quote from: rps on April 14, 2013, 03:56:19 pmThe Hantek DSO-2150 that I've bought in 2008 costs now $180. You can have the DSO-2090 for $150.Start by beating these devices.DSO-2150 specs are as follows: 60MHz 150MSa/s 64KBest regards

author: rps
author_rank: Newbie
timestamp: April 14, 2013, 04:55:02 pm
content: QuoteThanks, that's more or less what I was looking for answer-wise. I'm asking for the ideal specs of a cheap, beginner's, hobbyist scope. Even if such a product doesn't exist, what you would like to see in one (for these sort of people, not pros like most people on here). I know analog scopes are better and all that, but I'm talking about people who aren't going to need that much horsepower in their equipment.Thanks again.

author: rps
author_rank: Newbie
timestamp: April 14, 2013, 04:56:33 pm
content: Quote from: Balaur on April 14, 2013, 04:51:54 pmThanks.

author: casper.bang
author_rank: Frequent Contributor
timestamp: April 14, 2013, 05:06:44 pm
content: Some of the engineers where I work (I'm in software, they're in hardware) usesPC oscilloscopes by Pico. Apparently it makes it easier to document and exchange measurements. Because of this, It's the only PC scope I would consider.
Heathkit IM-105 Multimeter Schematic & Cal Info Needed - Page 1
Forum section: electronics / testgear

author: radiotek
author_rank: Contributor
timestamp: April 13, 2013, 03:58:22 pm
content: I am looking for the schematic and calibration instructions for my Weston 660 / Heathkit IM-105Multimeter so I can repair it. The Weston 660 is basically the same as the Heathkit IM-105. If thiscan be scanned or you copied please let me know. Any help would be greatly appreciated.
Altek 334 4-20mA Loop Calibrator - Page 1
Forum section: electronics / testgear

author: Cones
author_rank: Regular Contributor
timestamp: April 13, 2013, 02:33:18 pm
content: Hi,Another piece of equipment that I have bought on ebay recently. An Altek 334 4-20mA Loop Calibrator.If you are not familiar with 4-20mA process loops they are used extensively in control automation. The 4-20mA loop signal is perfect for long runs to sensors, actuators and inverter drives. It can source the 4-20mA to simulate a powered sensor or a control signal. It also has a 2 wire mode to simulate a 2 wire loop powered sensor. It will also work in both 4-20mA mode and 0-100% which is easier if you are testing signals to control equipment. As a bonus it also has a 0-100 VDC voltmeter function, so you can test the loop supply voltage on a 2 wire system.I was pretty sure it was going to be broken as it only sold for £21.50 and these are around $950 new. Although the new model is slightly different to this one.But a quick replacement of the three 9v leaky batteries that came with it and it proved to be almost spot on with my Fluke 179.It looks like this one was made in 08 1993 so pretty impressed that it is still working nearly perfectly after 20 years!The croc clips are a little rusty, and the 4mA-Adjust-20mA selector switch is a bit floppy in the middle position and could perhaps do with replacing.I'd be interested in the calibration instructions or a circuit diagram if anyone has them please?Anyway a few pictures for those interested.

author: Cones
author_rank: Regular Contributor
timestamp: April 13, 2013, 02:38:07 pm
content: A few more pictures.
DSO Choices  - Page 1
Forum section: electronics / testgear

author: ahnuts72
author_rank: Regular Contributor
timestamp: April 11, 2013, 04:27:41 pm
content: I'm looking for opinions on a digital scope choice.(I all ready have a tek 475a)My choices areRigol 2202 and be stuck with 2 chfor about 1700Rigol 4024 and get 4chfor about 2900 (a little more than I want to spend upfront)Agilent 2004a and get 4 ch and upgrade bandwidth later.for about 1900Sent from my Milestone X using Tapatalk 2

author: ben_r_
author_rank: Frequent Contributor
timestamp: April 11, 2013, 05:10:48 pm
content: Agilent sells refurbed in brand new condition with all accessories and full 5 year warranty (basically exactly like buying brand new) DSOs via their eBay store AgilentUsed. I just bought an MSOX2024A for $1850 USD. That model is still listed on eBay. Find the listing and use the Best Offer at $1850 and theyll accept. They will also heavily discount those accessories/add-ons listed in the description section of the listing. Thats the best deal youre going to find on a seriously nice professional entry level digital scope.

author: ahnuts72
author_rank: Regular Contributor
timestamp: April 11, 2013, 05:57:13 pm
content: I had forgot about agilent used thanks for the reminder.Sent from my Milestone X using Tapatalk 2

author: ben_r_
author_rank: Frequent Contributor
timestamp: April 11, 2013, 06:35:18 pm
content: No prob! Now enjoy much more bang for your buck!
ds2072 trial licenses expired with FW 00.00.01.00.05... - Page 1
Forum section: electronics / testgear

author: Xyphro
author_rank: Regular Contributor
timestamp: April 14, 2013, 02:23:21 pm
content: Hi!I received yesterday my new Rigol DS2072. It had the trial licenses installed and many hours of usage left.It has Software Version 00.00.01.00.05 installed which is as far has -as far as I read here in the forum- NOT the self calibration bug.Yesterday I did a self calibration to calibrate a large DC offset out. Today I wanted to test the Ethernet port and connected it to Lan. After powering up I was very disappointed to see that ALL licenses expired.So I think it is not solved with the mentioned SW version. Maybe in this case the root cause was not the self calibration?!Does anybody have an Idea how to recover the licenses? I was planning to try out the serial decoding feature today.Best regards,Kai

author: Xyphro
author_rank: Regular Contributor
timestamp: April 14, 2013, 03:08:41 pm
content: ...suddenly the licenses reinstalled (2130 minutes left)?!Nice surprise and I have no idea how and why this happend. Funny...

author: bmwnomad
author_rank: Contributor
timestamp: April 14, 2013, 03:47:56 pm
content: I did the same, self-cal on .05 a few days ago. Unfortunately, my trial licenses haven't returned yet.Any idea what you were doing when they returned? There must be something that triggers it to return.Steve

author: marmad
author_rank: Super Contributor
timestamp: April 15, 2013, 07:47:23 pm
content: We're not posting the method publicly because we're trying to keep the exploit available in future releases of the firmware. While well-intentioned, these kinds of threads might attract the attention of people from other websites - causing the information to spread quickly - and making you-know-who nervous enough to throw time and money at attempting to plug it. But there are many members who can be PMed for the information - just try a few that have posted about the subject over inthe main review thread.
How do you put an image in a Rigol DS1052E startup - Page 1
Forum section: electronics / testgear

author: NeoRecasata
author_rank: Newbie
timestamp: April 11, 2013, 05:35:10 am
content: How did Dave put his image on the Rigol DS1052E startup in Segan's first oscilloscope

author: Bored@Work
author_rank: Super Contributor
timestamp: April 11, 2013, 05:45:06 am
content: IIRC he didn't. A forum member (drieg?) "customized" the firmware for him.
incredible price for something like the 113000$ scope 12Ghz - Page 1
Forum section: electronics / testgear

author: ddavidebor
author_rank: Super Contributor
timestamp: April 10, 2013, 09:03:59 pm
content: is that possible ?http://www.ebay.it/itm/Agilent-DSO81204A-12-GHz-40GSas-4-Channel-Oscilloscope-/140944723142?pt=UK_ToysGames_ModelKits_ModelKits_JN&hash=item20d0f5ccc6&_uhb=1#ht_500wt_1051

author: ben_r_
author_rank: Frequent Contributor
timestamp: April 10, 2013, 09:09:50 pm
content: Seller reviews look good. Maybe they dont know what they have? Looks like a crazy deal to me. Id jump on it, not like you cant get your money back through paypal. At least thats how it is in the US. No idea how well paypal works outside.

author: grego
author_rank: Frequent Contributor
timestamp: April 10, 2013, 09:12:13 pm
content: It's already unlisted. Not sold, but unlisted.

author: ben_r_
author_rank: Frequent Contributor
timestamp: April 10, 2013, 09:14:03 pm
content: Ah. Price mistake. Lets see if it pops back up at a higher price.

author: ddavidebor
author_rank: Super Contributor
timestamp: April 10, 2013, 09:39:33 pm
content: Yeah, it was really underpriced.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: April 10, 2013, 10:25:57 pm
content: Perhaps its original owner spotted it...

author: ben_r_
author_rank: Frequent Contributor
timestamp: April 10, 2013, 10:52:04 pm
content: Quote from: mikeselectricstuff on April 10, 2013, 10:25:57 pmHa ha! Could be!

author: Rufus
author_rank: Super Contributor
timestamp: April 11, 2013, 01:04:58 am
content: Quote from: ddavidebor on April 10, 2013, 09:03:59 pmNo it isn't possible. The pictured scope sold in in January for $15,000 in the states.Someone has their ebay account compromised. The scammer lists copies of previous listings of high value items at bargain prices. Anyone dumb enough to bite will be asked to make payment by bank transfer or western union or something and won't see the item or their money again.The "FOR PAYMENT WE TAKE BANK TRANSFER" added to the bottom of the item description should give you a clue.

author: ddavidebor
author_rank: Super Contributor
timestamp: April 11, 2013, 05:06:46 am
content: Mmh this thing need to be know because if it's true is a present for this price

author: AndyC_772
author_rank: Super Contributor
timestamp: April 11, 2013, 05:26:23 am
content: It's listed under "toys and games", and all the previous sales by that user are for in-car audio accessories. No question, it's a compromised account.