hybridfree/eevblog-posts huggingface dataset:
New PicoScopes - Page 1
Forum section: electronics / testgear

author: Reboot
author_rank: Contributor
timestamp: November 13, 2013, 03:56:23 am
content: Tonight I went to Picotech to get the latest version of their software.Seems they have a whole new line of their 2200 series scopes just released; and they look nice! They are smaller than the old ones and now go all the way to 200Mhz.I have a Pico 5000 series, 4 channel scope which I really like. I use it for gathering mountains of data, and for mechanical vibration spectrum analysis. It is a beast of a pc based scope. Their software is the best I have ever used for this type of product.

author: Rasz
author_rank: Super Contributor
timestamp: November 13, 2013, 04:55:19 am
content: USB 2.0plus"Buffer memory 8 kS 16 kS 32 kS 40 kS 48 kS"Sounds painful to use.

author: JohnnyGringo
author_rank: Regular Contributor
timestamp: November 13, 2013, 05:03:34 am
content: Quote from: Reboot on November 13, 2013, 03:56:23 amWhat other software have you used for this type of product? I'm just curious as to your sample size.

author: Reboot
author_rank: Contributor
timestamp: November 13, 2013, 05:29:58 am
content: Not that many i guess. I don't know how many different ones there are, but i have used or demo'ed the more popular ones i think.I personally have a USBee AX and DX with the software upgrade, a USBinstruments swordfish, parallax USB scope(toy), and a logicport(also good software, but not applicable here). I have a tried a friend's Cleverscope which was ok.Before I purchased the Pico, I had evaluated the Hantek USB scope software in demo mode. Bitscope also has an online demo which i checked out.

author: JohnnyGringo
author_rank: Regular Contributor
timestamp: November 13, 2013, 05:44:20 am
content: How did you like the USBee? I've been considering the QX model.

author: Reboot
author_rank: Contributor
timestamp: November 13, 2013, 06:11:03 am
content: My DX is a very nice tool. That being said, it is more of a digital tool (logic) and has a very low sample rate for analog work - 24msps shared between digital and analog. You have to buy the additional "suite" software to get even basic analog triggering. Although the software is pretty, it is not so intuitive to use.The QX is their new one which seems to be more of a real tool. I don't know if it is easier to set up and use, but to me the software looks the same. One other thing about the software is that the suite tool is the only app of theirs that is all together integrated which kind of limits it and complicates it all at the same time. (if that makes sense) All of the other individual functions (i.e. scope mode program) are separate applications.I really like the Pico software a lot better. It has advanced triggering capability and a host of other features that you find on bench scopes like masking, decoding about everything, and persistence. It will run in demo mode without the instrument, including the function generator, so you can really get a feel for how well it works. There are also a ton of youtube videos especially showing how to use it for automotive troubleshooting.
LFSR for HP signature analyzer? - Page 1
Forum section: electronics / testgear

author: resistor
author_rank: Regular Contributor
timestamp: November 12, 2013, 08:21:00 pm
content: I'm trying to repair an old HP 3456A meter. I've been working my way through the service manual, and have reached the point where I start needing to use a signature analyzer, which I don't have handy. I could go out and buy one, but it seems like I should be able to make out out of, say, an FPGA dev board. Unfortunately, I have only been able to find fairly sketchy descriptions of how they work. I know that it's basically a linear feedback shift register, but the only description of the tap points for the LFSR I've found is the diagram here:http://books.google.com/books?id=DSHSqWQXm3oC&pg=PA2104&lpg=PA2104&dq=signature+analyzer&source=bl&ots=o-PRBQMI2N&sig=OtgjLfzZFh-uePaNamST4AgKW3s&hl=en&sa=X&ei=JY2CUpqXLaWIiALctoCgDw&ved=0CHcQ6AEwDQ#v=onepage&q=signature%20analyzer&f=falseDoes anyone know if that set of tap points is correct, or know where I could find out?

author: PaulAm
author_rank: Frequent Contributor
timestamp: November 12, 2013, 10:36:22 pm
content: Look for a service manual for a Tek 308 Data Analyzer and look in the theory section. It has a description of how signature analysis works. The tap points are the same as your referenced diagram. The Tek 308 is compatible with the HP signature data.You could also look for service manuals for HP 5004/5/6 signature analyzers. They should have theory sections.You can generally find signature analyzers in the $50-100 range. Although it sounds like a fun project, is it really worth rolling your own? A presumably repairable hp 5004 just went for under $40 including shipping.
Someone please explain why these are priced like this... - Page 1
Forum section: electronics / testgear

author: cidcorp
author_rank: Unknown
timestamp: November 11, 2013, 05:08:47 am
content: I've noticed this before, but never gave it much thought.Why are these supplies sooooo much more expensive than others on eBay?(sorry don't know if the links will work correctly - so listed item number after link)http://www.ebay.ca/itm/USA-Brand-Precision-Lab-GQ-A305D-Variable-30V-5A-DC-Power-Supply-w-CV-CC-mode-/290627598340?pt=LH_DefaultDomain_0&hash=item43aac13804ITEM NUMBER: 290627598340http://www.ebay.ca/itm/Precision-Lab-PS305D-Variable-30V-5A-DC-Power-Supply-/310295629869?pt=LH_DefaultDomain_2&hash=item483f0f902dITEM NUMBER: 310295629869I'm assuming because they are both from the same seller that someone didn't read the list price correctly as I'd expect this Bench Supply to go for 1/10 the price (ie: drop the last zero).Just confirming that there is no other reason it could be so much more, well unless it's a lot of 10...lol.Told seller a month ago, they ignored my message.I'm looking for a new dual or triple output power supply, at least a 30v 5A max, and one of the 3 channels can be a fixed 5v.I've been using a Micronta Adj Dual-Tracking Supply from Radio Shack (bought when I was alot younger) and it's been good to me, butI need something with a digital readout...so I'm shopping around. I think $200 or 300 is going to be my price point... if anyonehas suggestions.ThanksChris

author: mariush
author_rank: Super Contributor
timestamp: November 11, 2013, 05:31:42 am
content: The eBay seller ran out of stock of those particular models.If they close the sale page, when they have the model in stock again they'll have to open a new listing and they get charged $0.5 or whatever the eBay fee is , the "More than 10 available / 16 sold " or "More than 10 available / 82 sold" text by the "Item quantity" gets lost (some buyers will actually be convinced to buy from a seller who sold a lot of units compared to one with new listing) and so on.It's just easier for them to adjust the price to some ridiculous value.

author: Monkeh
author_rank: Super Contributor
timestamp: November 11, 2013, 05:34:36 am
content: Quote from: mariush on November 11, 2013, 05:31:42 amI find it amazing eBay are so slow on the uptake.

author: cidcorp
author_rank: Unknown
timestamp: November 11, 2013, 02:51:45 pm
content: Quote from: mariush on November 11, 2013, 05:31:42 amWell thanks that explains it perfectly.

author: rastro
author_rank: Frequent Contributor
timestamp: November 11, 2013, 03:08:58 pm
content: I just discovered this myself on an $818.00 I.C..Maybe this also explains crazy prices on some used test equipment. I guess the take away is to mostly rely on prices of sold items to establish fair market.

author: scratch_monkey
author_rank: Contributor
timestamp: November 13, 2013, 03:00:47 am
content: Also, they might get lucky and sell one to some poor fool!
SMD Wedge Probes any cheap? - Page 1
Forum section: electronics / testgear

author: Carrington
author_rank: Super Contributor
timestamp: November 05, 2013, 11:02:27 pm
content: Agilent SMD Wedge Probes:http://www.home.agilent.com/en/pc-1455359/oscilloscope-probe-accessories?pm=SC&nid=-34380.0&cc=ES&lc=engAnd the question is: Exist a cheaper version?Apart from this:http://www.uchobby.com/wp-content/uploads/2007/05/wedge.jpgand similar ->http://essentialscrap.com/probe/

author: Carrington
author_rank: Super Contributor
timestamp: November 12, 2013, 08:32:06 pm
content: Yes I know, this is not exactly the same as wedge probes, but: Has anyone bought some IC-Caps cheap for 5mm probes (such as Rigol's RPxxxx)?
Rigol DS1074Z Rack mount - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: November 12, 2013, 12:33:15 am
content: Well, I am planning my DIY 19in instrument rack, and are there any rack mount clones for the ds1074z? $137 seems like an awful lot.

author: JDubU
author_rank: Frequent Contributor
timestamp: November 12, 2013, 12:45:24 am
content: Not quite as elegant, but you could put it on a rack mount shelf:http://www.monoprice.com/Product?c_id=105&cp_id=10516&cs_id=1051602&p_id=8631&seq=1&format=2Don't be fooled by the low price. Monoprice sells excellent quality stuff. This shelf is really heavy duty.

author: Mark_O
author_rank: Frequent Contributor
timestamp: November 12, 2013, 05:31:01 am
content: I'd agree with JDubU's recommendation... both on the shelf, and Monoprice.There's a big advantage to putting it on a rack shelf... you can grab and go if you need to use it outside your lab. And move it around, when the mountain can't come to Mohammed.Screwing it into a rack isn't a great option for a scope, IMO, unless it's there strictly to monitor some fixed set of signals, also permanently mounted in the rack.

author: manzini
author_rank: Regular Contributor
timestamp: November 12, 2013, 09:06:36 am
content: I have a ds2072 in a rack shelf, but the devil is in the details.like this:a) Deep with a bar at bottom to prevent drops. Do not mount the front barb) 2U shelf but you must take 4.1U, don't mount the front bar.c) 1mm of foam to avoid sliding when push buttons&knobsd) lateral grooves help you put it on one side without interrupting the fan air flow.
Wait for Rigol DS2072-A ? - Page 1
Forum section: electronics / testgear

author: JohnnyGringo
author_rank: Regular Contributor
timestamp: October 18, 2013, 11:00:45 pm
content: Is there going to be enough of a difference between the Rigol DS2072 and the DS2072-A version to warrant waiting another month or so? Or should I go ahead and get the DS2072 one now?Thanks,

author: olsenn
author_rank: Frequent Contributor
timestamp: October 19, 2013, 12:50:43 am
content: Yes. 300MHz bandwidth! Hopefully a free hack

author: apelly
author_rank: Unknown
timestamp: October 19, 2013, 01:14:01 am
content: I'm just about to buy one. John at Emona said I would get the "A" version which he is expecting in stock fairly soon. So maybe it's not such a long wait?

author: olsenn
author_rank: Frequent Contributor
timestamp: October 19, 2013, 05:33:09 pm
content: I'm under the impression that they will be shipping in early December. A nice Christmas gift for you

author: JohnnyGringo
author_rank: Regular Contributor
timestamp: October 19, 2013, 05:44:15 pm
content: Quote from: apelly on October 19, 2013, 01:14:01 am"Fairly Soon" is such a relative term. Especially if you're waiting in line to.... <anyway>Did he put any expectations on ETA? Also, do products tend to hit Australia before US?After finally deciding on Make/Model/Budget, hard to wait, waiting... waiting...It would be a GREAT Christmas Gift! I promise to be good for the rest of the year!

author: apelly
author_rank: Unknown
timestamp: October 19, 2013, 08:28:16 pm
content: Quote from: JohnnyGringo on October 19, 2013, 05:44:15 pmNo. His exect words: "I think they are due in soon"Quote from: JohnnyGringo on October 19, 2013, 05:44:15 pmNo Idea.

author: van-c
author_rank: Regular Contributor
timestamp: October 19, 2013, 10:02:32 pm
content: TEquipment in the US is taking orders now for the DS2072A, with shipping estimated late in November. But it is still unclear (from the lack of confirmation on this forum) whether the DS2000A models will be compatible with the upgrade techniques discussed in several threads here. It is possible the new models may have changes that prevent these techniques from working.Although waiting to see whether the DS2072A will be compatible is certainly an option, it is also quite likely that once the "A" models are shipping, the DS2072's will be phased off the market. This has been my dilemma and, consequently, I decided to order the 2072 instead of the 2072A. But there are some determined minds at work on this forum, and there will undoubtedly be exciting things happening with the new models as well.

author: JohnnyGringo
author_rank: Regular Contributor
timestamp: October 19, 2013, 10:08:22 pm
content: I would hope that the DS2072 would be discounted once the -A hit the market.

author: Gazza
author_rank: Newbie
timestamp: November 12, 2013, 11:29:13 am
content: Quote from: JohnnyGringo on October 19, 2013, 10:08:22 pmProbs not, with the unlock software going around they are more likely withdraw it altogether or sell it at the same price as the "all options" version.
UNI-T UT61C calibration - Page 1
Forum section: electronics / testgear

author: jay
author_rank: Regular Contributor
timestamp: November 18, 2013, 01:06:02 pm
content: My UT61C has an annoying feature: resistance values are systematically slightly below the actual resistance. Is there anyway to adjust it? I guess they have some calibration values in their firmware or do they? Voltage measurements are quite accurate (or at least almost the same as in two different Fluke meters, 87V and 289).p.s. "Get a proper meter" is not a good answer unless you're planning to donate one.

author: TMM
author_rank: Frequent Contributor
timestamp: November 18, 2013, 02:07:47 pm
content: If i remember correctly all the calibration is done by trimmer pots/caps and there isn't one that specifically does resistance. You may be able to bring it into calibration for resistance at the expense of voltage calibration or something like that.edit:that's for the UT61E - chances are the UT61C is the same.
Extech Ex330 - missing main chip? - Page 1
Forum section: electronics / testgear

author: da_n
author_rank: Newbie
timestamp: November 09, 2013, 12:52:32 pm
content: Hi, first post here so I am sorry in advance for any noobie errors. I recently bought an Extech Ex330 after watching Dave's $50 shootout, I thought I would have a quick look inside just to check it all looked OK. After removing the back I was very surprised to see the main chip appears to be unpopulated, picture attached (including screenshot from the YouTube shootout which shows it populated). Wonder if people think this is simply a case of them revising the board and no longer needing the chip, or would this raise your suspicions? Thanks.

author: Lightages
author_rank: Unknown
timestamp: November 09, 2013, 12:56:13 pm
content: I does have the main chip. Under that black blob of epoxy is a form of the chip in bare form, no package. This is called "Chip ON Board" and is a common way of manufacturing circuit boards in order to save costs. The footprint for a full chip is also sometimes included so as to allow the possibility of a full packaged chip if necessary.

author: da_n
author_rank: Newbie
timestamp: November 09, 2013, 12:59:20 pm
content: Ah I seeThanks for clearing up my confusion, you learn something new every day I guess (I am new to electronics). Cheers!

author: Zbig
author_rank: Frequent Contributor
timestamp: November 09, 2013, 09:12:28 pm
content: I once heard someone calling them "topless" chips
Siglent Spectrum analyzer - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: November 10, 2013, 03:21:40 am
content: What is the general consensus on their spectrum analyzers? I haven't seen any posts about them before, only about the Rigol DS815.

author: rf-loop
author_rank: Super Contributor
timestamp: November 10, 2013, 08:56:53 am
content: Quote from: echen1024 on November 10, 2013, 03:21:40 amPerhaps becouse it looks like they are not designed for hobby markets.Example SSA3030 price is in +4kEur class depending some other things.

author: rockandroll
author_rank: Newbie
timestamp: November 11, 2013, 07:18:34 am
content: I think they pay more attention to education and industry, look at the price and new product SDS2000, they concentrate on oscilloscope like Lecroy
Summery of videos for Siglent SDG1000 - Page 1
Forum section: electronics / testgear

author: Fay
author_rank: Contributor
timestamp: November 15, 2013, 07:43:21 am
content: O0 O0 I collected some videos for cheap siglent SDG1000, which I personally favors.Please add in if you guys have moresaying AKTAKOM, but in fact manufactured by Siglent
Fluke 8050a help  - Page 1
Forum section: electronics / testgear

author: Napalm2002
author_rank: Regular Contributor
timestamp: November 10, 2013, 12:09:18 am
content: I had just purchased a fluke 8050a and it was said that the current is inop. Otherwise meter is fine. It hasn't shown up yet but hopefully it shows soon. Assuming that the current function is inop, do u guys have any idea where to start. Besides fuses of course.

author: drtaylor
author_rank: Regular Contributor
timestamp: November 10, 2013, 12:18:29 am
content: The current circuitry is relatively simple. Once you've confirmed that the fuses are good, just use a DMM to check the shunts. The Diode bridge protection circuit would be the next candidate. All this assumes that the unit works in DCVs. Rarely switches can get fried. Anyway should be easy to fix.

author: Napalm2002
author_rank: Regular Contributor
timestamp: November 10, 2013, 12:56:19 am
content: Thank you Dr. I will post as soon as I get it and check it out. Thanks again Doc

author: Lectricman
author_rank: Newbie
timestamp: November 10, 2013, 01:59:42 pm
content: 90% chance a fuse is the problem in my experience.

author: Napalm2002
author_rank: Regular Contributor
timestamp: November 10, 2013, 04:09:52 pm
content: I would think that also, but I'm completely shooting from the hip bec I don't actually have it in the bench yet. I'm eagerly awaiting its arrival.
Pace MBT250 Calibration Modules - Page 1
Forum section: electronics / testgear

author: educational
author_rank: Newbie
timestamp: May 10, 2013, 09:02:22 am
content: Hi Everyone,I would like to calibrate my Pace MTB250 85A Desoldering Station.Would anyone have a diagram or information of the two modules ( C1 and C2 ) that is used to calibrate this unit. Looking at the picture of the two modules it looks like a male plug, PCB board and a resistor.Any help in my request would be very much appreciated.Thank you.

author: sdim
author_rank: Contributor
timestamp: November 09, 2013, 09:07:40 pm
content: I'm also looking for a schematic for these modules.It looks that the resistor connects two of the connector pins. If only I knew the resistor value, the power rating and the pins it would be perfect.They are not available in my country. Buying the kit directly from pace it out of question, they charge 85AUD just for the shipping cost.
Cheapo variable power supply amperage is way off? - Page 1
Forum section: electronics / testgear

author: XOIIO
author_rank: Super Contributor
timestamp: November 09, 2013, 07:14:09 pm
content: Hey there, I noticed this problem with my cheapo (and used) variable power supply recently and I was hoping you guys might have a solution.Also, when I hook a low load, like an arduino, to it (which would normally draw 30 miliamps) it just climbs up and up, and has gotten to 12 amps even though that's impossible.So, what gives?
With or without signal gen? - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: November 06, 2013, 12:46:28 am
content: I have narrowed my oscilloscope hunt down to the Rigol DS1074Z, but now, the question is to whether buy the arb gen for about $200 more, or save up for a DG1032/5062 or a Siglent SDG5082.

author: Fsck
author_rank: Super Contributor
timestamp: November 06, 2013, 01:01:12 am
content: once you have a scope, you really want a signal gen.however, not everyone needs an arb. do you really need an arb? = what do you plan to do?I have a rigol dg2021 and I haven't used the arb function yetI probably could've survived with an old HP signal gen

author: echen1024
author_rank: Super Contributor
timestamp: November 06, 2013, 01:09:39 am
content: I am watching a broken HP 3312A signal gen on eBay. 12MHz, needs repair, for about $75 or best offer. What do you think it's worth.

author: Mark_O
author_rank: Frequent Contributor
timestamp: November 06, 2013, 03:09:14 am
content: Quote from: echen1024 on November 06, 2013, 01:09:39 amIf you don't know enough to be able to fix it, then it's not worth anything.

author: creyc
author_rank: Regular Contributor
timestamp: November 06, 2013, 03:50:04 am
content: Another point to consider if you get a scope with a built-in signal gen is that's one less piece of gear on your bench.For guys like myself and many other who end up jamming a small laboratory full of stuff into a corner of a garage or spare bedroom, bench top real estate really starts to get very valuable.I don't NEED any arbitrary waveform generator, true, I could get by fine on an older HP or something but then I need to find a place to put it as well.

author: hofig
author_rank: Newbie
timestamp: November 09, 2013, 07:00:07 am
content: Scopes with signal gen built in can be very tempting for small space. I'd get on right now, if the signal gen on 1000Z-S series had a wider voltage range.

author: echen1024
author_rank: Super Contributor
timestamp: November 09, 2013, 03:59:51 pm
content: Bench space is not a problem. I have 2 Ikea tables in the attic.
Tek 2236 Calibration - Page 1
Forum section: electronics / testgear

author: lnx64
author_rank: Regular Contributor
timestamp: November 08, 2013, 10:33:20 pm
content: Considering since buying this at an electronics surplus store, I'm surprised it at least seems like it's still in calibration. Can anyone verify that's more familiar with scopes? I'm still learning how to read it. I did find that according to the frequency counter, my sound card is more accurate at a 1KHz square, than the scopes built in generator. But not as clean. I hope I can definitely use this scope seriously and accurately.My Mac laptop generating 1KHz.My scopes built in 1KHz generator.And just for the sake of knowing what the adjustments were, here's the settings on the scope, so you see the time base and volts/div.Channel A is on the Mac, and channel B is on the scopes built in generator.

author: sync
author_rank: Frequent Contributor
timestamp: November 08, 2013, 11:19:16 pm
content: The probe adjust generators are usually not very accurate. Something like 1kHz +/-25%.

author: lnx64
author_rank: Regular Contributor
timestamp: November 09, 2013, 12:34:53 am
content: Ouch, I would have thought if it's for calibrating the probes, it'd be a good way to calibrate the scope too..Woops!Ok. So in the case of the good 1KHz square, minus the ripple, does it look like the scope is working good? I don't know how to read the dashes on it yet.. I haven't found good scope books that cover a scope like mine, all of the papers I find are for the more modern ones.

author: Unknown
author_rank: Unknown
timestamp: November 09, 2013, 01:23:17 am
content: The probe compensation output is not a frequency reference. It's adjust the AC attenuation ratio of 10x (and 100x/1000x) probes to match the DC attenuation ratio, so the probe has a flat frequency response from DC to low frequency AC. The fundamental frequency of this signal is pretty much irrelevant, since you're adjusting the probe for the cleanest rising edge.Frequency response of the probe compensation signal looks good. The amplitude looks like it's fairly close to 5V pp (assuming you're using a 1x probe or simple wire). Period is a little under 5 divs, with the time base set to 0.2 ms/div this is a little under 1 ms, or a frequency of a little over 1 kHz. The frequency of the signal from your sound card looks like pretty much spot-on 1 kHz (5 divs period). The high-frequency response of that sound card obviously sucks, but I guess clean square waves wasn't one of their design goals. Given the fact that the CRT of the scope was probably only specced for 2% accuracy or so, I would say that the scope appears to be fine on these time base / attenuator settings.I would highly recommend watchingAlan's (w2aew's) oscilloscope tutorial videos, or if you prefer reading the Tektronix primerXYZs of Using a Scope.

author: lnx64
author_rank: Regular Contributor
timestamp: November 09, 2013, 01:39:03 am
content: Good to know it's looking on par then.I'll definitely check that out, thanks.
BK Precision 875B LCR Meter - Page 1
Forum section: electronics / testgear

author: bogoljub
author_rank: Newbie
timestamp: October 28, 2013, 10:20:58 pm
content: Please schematic for BK Precision 875B LCR Meter.Thanks.

author: bogoljub
author_rank: Newbie
timestamp: November 08, 2013, 01:03:52 pm
content: Thanks B&K Precision Tech Support for scnematic.

author: bogoljub
author_rank: Newbie
timestamp: November 08, 2013, 03:41:03 pm
content: Thanks to the support of the company BK Precision obtained schemes and fixed RLC meter
Wanted - schematic for Blackstar Apollo 10 Universal Counter timer - Page 1
Forum section: electronics / testgear

author: alanb
author_rank: Frequent Contributor
timestamp: November 07, 2013, 06:25:02 pm
content: Can any one tell me where I can get a copy of the schematic for the above? So far the only the only documentation that I have been able to find is the instruction manual. Thanks in anticipation.
Asking for advice. Need DSO + AWG. Combo Unit or Seperates? - Page 1
Forum section: electronics / testgear

author: JohnnyGringo
author_rank: Regular Contributor
timestamp: November 09, 2013, 02:40:34 am
content: My budget: $2.5K USD left on initial funding ($5K) .My needs: In circuit cap testing, learning EE and for general electronic repair work. Eventually: Robotics.My experience level: max noob. The more I'm learning, the more I don't know.I know about ESR meters, but seems like a DSO+AWG can do pretty much the same and more than just an ESR meter.With a combo DSO+AWG, don't you use up one probe when you are generating a waveform? Which would only leave one probe for signal debugging. That makes me lean toward buying separate DSO and AWG units.I'm considering getting a DS2072 (for functionality) and a DS1000Z-S (for the extra channels and it's AWG).I've pretty much got everything else I need (AFAIK) for setting up my lab:Soldering Station (JBC DD),STEINEL Heat gun 2510,2 DMM(Fluke 87V, Amprobe AM-140-A),Hakko 880 Solder Sucker (can't recommend that one),PanaVice w/various heads and accessories,Audrino Due, bunch of passives/chips, ESD mat, hand tools, and consumables.*If anyone has any questions about the above products, I'd be glad to give my opinion on them.I don't have a *real* bench PSU, using several converted ATX PSUs for now. It's amazing how quickly you can burn through a budget.With all the new Rigol products hitting the market, it makes the choices that much harder. I'm waiting until Black-Monday (Monday after Thanksgiving) for all the (hopefully) online blow-outs.Is the combo DS2072/DS000Z-S an OK idea? Or is there a better combination of choices for DSO/AWG.-Thanks for your input.

author: tautech
author_rank: Super Contributor
timestamp: November 09, 2013, 06:24:22 am
content: Consider this:https://www.eevblog.com/forum/testgear/siglent's-new-product-msosds2000-series/70MHz model with AWG whats more Dave will be doing a review shortly.

author: Hydrawerk
author_rank: Super Contributor
timestamp: November 09, 2013, 09:31:20 pm
content: Well, never buy a scope from an early batch. Wait a few months until all the initial early problems are fixed.On the other hand, that Siglent SDS2000 looks great. I am looking forward to the review.A separate function generator has more features, for example modulation input, a larger output amplitude and a better front panel with a numeric keyboard. If you have enough money and bench space, buy a separate function generator.(I bought a DSOX2002A because there was a special offer with a free built-in function generator. But it has no arbitrary function.)https://www.youtube.com/channel/UCw_LXic7XLq1_zSuwTQODFQ/videoshttps://www.eevblog.com/forum/reviews/my-new-toy-%29-agilent-dsox2002a-sex-on-a-stick!/msg216361/#msg216361
Mini Teardown of the Turnigy Smart 6 Charger - Page 1
Forum section: electronics / testgear

author: AlessandroAU
author_rank: Regular Contributor
timestamp: November 06, 2013, 01:18:24 am
content: I watched Dave's Video of the Turnigy Accucel 6 Charger. I happen to have a Turnigy Smart 6 which has slightly different internals so I thought I'd take it apart and post a few images if anyone is interested.Main Differences,Hardware:Graphical LCD (128x64 I presume) instead of the 16x2 standardAdditional higher change and discharge current, 7a charge 1.5a discharge, they added more fets to achieve this.Soft buttons instead of tactile switches.ATmega128AUInterestingly the programming header has been populated, and an additional 2 pins broken outSoftware:Internal Resistance measurement featureBattery Charge/Dischange curveAdjustable voltage CutoffsAutomatic battery charge/discharge cycle featureCharge/Discharge Power limitshttp://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=15403

author: AlessandroAU
author_rank: Regular Contributor
timestamp: November 06, 2013, 01:18:55 am
content: More Images

author: aargee
author_rank: Frequent Contributor
timestamp: November 06, 2013, 03:54:07 am
content: That looks like a nice charger, how does it perform?I like the internal resistance feature...I have the Accucel6 and have not had a problem with it.

author: AlessandroAU
author_rank: Regular Contributor
timestamp: November 06, 2013, 11:10:21 am
content: Not a fan of the soft buttons, but otherwise its my charger of choice. I really like that it plots the battery charge/discharge curve, makes it easy to spot a bad cell. I also have a iMax B5, but the buttons are starting to go bad.

author: true
author_rank: Frequent Contributor
timestamp: November 07, 2013, 03:33:13 am
content: I wanted to buy one of these some time back...when I went to buy, it looks like they were discontinued!Has production restarted on these?I was going to mod mine with clicky buttons.

author: Lightages
author_rank: Unknown
timestamp: November 07, 2013, 03:42:20 am
content: Is this a piece of test equipment?

author: aargee
author_rank: Frequent Contributor
timestamp: November 07, 2013, 07:16:20 am
content: Well it is a battery charger...but... it doesmeasureinternal resistance of batteries and other useful battery info as part of it's spec.You choose. I'd use it for testing batteries!

author: AlessandroAU
author_rank: Regular Contributor
timestamp: November 07, 2013, 09:45:01 am
content: Quote from: true on November 07, 2013, 03:33:13 amIt seems to be available in stock so I would say so. I like it much better than the imax B5 (Almost identical to the Accucel)Quote from: Lightages on November 07, 2013, 03:42:20 amThere is already a thread on the Turnigy Accucel6 so I would guess so

author: mos6502
author_rank: Frequent Contributor
timestamp: November 07, 2013, 12:40:21 pm
content: Did you check if the three pin port outputs serial data like on the Accucel 6? Because when you hook the Accucel 6 up to the PC and use an app like LogView, you can make nice graphs like this one. So yeah, it's most definitely test equipment.
Oldacker Test Leads and Accessories - Page 1
Forum section: electronics / testgear

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: November 06, 2013, 12:54:32 pm
content: So I am running a few errands, and I stop by my local electronics surplus store called Philcap in Akron, Ohio and pickup a few items I need. I'm always looking for extra probes, test leads and accessories and I ran across a needle point, nickel plated, polished probe set made by Oldaker. To my surprise, they are made right here in Ohio and have a rather large distributor list. Considering they were not extremely expensive and NOT made in China, I decided to pick up a set and much to my surprise these test leads are pretty good quality.Here are the specifications the company claims on their website:The TIP on this lead is made of .080" Dia. X 5/8" long stainless steel with a polished point for insulation piercing. Threaded 8-32 for attachments. (Nickel plated). . .The PROBE is 5" molded flame retardant ABS plastic with 3/4" safety ring. .The WIRE is 18 ga. (65x36) tinned copper stranding, rubber insulation .145" Dia. 20KV breakdown 5KV working... Standard length is 4 feet, sold as sets 1 red, 1 black.I tested the lead resistance with my Agilent DMM, .048 Ohms with just 2-Lead touching together and ExTech MiliOhm meter using Kelvin 4-Wire I was getting .6 mOhm (Unloaded) and 26.6 mOhm (Load Tested). The tip is very sharp, and the rubber feels good and very silicon like. They fit very snug in my Agilent DMM almost like they were made for it. Looking them up on their website and doing some research on their past, they appear to be a family oriented company and seem to make a decent product. I will do some more testing and update this thread if needed.Here is the companies website:http://www.testleads.net...and for those that have heard of and maybe use Oldaker, hold the laughing to a minimum, this is the first I have heard of them!

author: retiredcaps
author_rank: Super Contributor
timestamp: November 06, 2013, 05:20:43 pm
content: I had a set of Mueller probes and yes they are darn sharp probe ends.

author: nanofrog
author_rank: Super Contributor
timestamp: November 06, 2013, 07:34:50 pm
content: I'm quite familiar withMueller(also located in Akron), but never heard of Oldaker.Reminds me a lot of Probemaster. Even the probe grips are the older style of "Softie" probes that Probemaster used to sell.

author: SLJ
author_rank: Frequent Contributor
timestamp: November 06, 2013, 07:45:13 pm
content: They look good but I emailed them last year to buy a bunch and they never answered my emails.
Agilent Handheld Digital Multimeter 4 wire resistance measurement. - Page 1
Forum section: electronics / testgear

author: jmcdonald
author_rank: Contributor
timestamp: November 06, 2013, 09:21:48 am
content: Agilents web site has listed that all there handheld multimeters have 4 wire resistance measurement capabilities this is a mistake/typo that thay need to fix.

author: con-f-use
author_rank: Unknown
timestamp: November 06, 2013, 09:58:23 am
content: You're using Internet Explorer. Also a mistake worth fixing(just kidding, couldn't resist)But yes,for Agilent. You should order, then sue them! Guess technically you can measure 4 different wires with the meter so no wrong.

author: jmcdonald
author_rank: Contributor
timestamp: November 06, 2013, 11:22:53 am
content: Quote from: con-f-use on November 06, 2013, 09:58:23 amI'm ordering the U1231A, U1177A Bluetooth Adapter and U1233A .I switch between ie and fire fox.

author: Wytnucls
author_rank: Super Contributor
timestamp: November 06, 2013, 11:28:00 am
content: If you get two meters for the price of one, then you can do 4-wire measurements.

author: Lightages
author_rank: Unknown
timestamp: November 06, 2013, 06:45:57 pm
content: Holy crap! Those prices are really bad.
does anyone have an RK8512 programmable load? - Page 1
Forum section: electronics / testgear

author: daedalus
author_rank: Regular Contributor
timestamp: November 06, 2013, 03:59:20 pm
content: Mine just arrived, and helpfully the manual is entirely in Chinese. Apparently some of the retailers have translated manuals (mine doesn't), so thought I'd ask here in case someone has a translated pdf.
Read RMS voltage with a Rigol DS2000 scope? - Page 1
Forum section: electronics / testgear

author: zener
author_rank: Contributor
timestamp: November 06, 2013, 02:45:48 pm
content: I want to be able to get the RMS voltage of a waveform with my Rigol DS2000 scope.I have searched the menus and can't find a RMS function, does it exist?I am looking at noise like signals and need the RMS reading.Pete.

author: JDubU
author_rank: Frequent Contributor
timestamp: November 06, 2013, 03:26:59 pm
content: Press the left side "Menu" button repeatedly until the "Vertical" menu content appears.Press the left side down arrow button once to scroll the Vertical menu to its second page.Vrms will be the first selection at the top of the second page of the Vertical menu.You can press the CH 1 or CH 2 buttons in the vertical controls area to show the applicable Vertical menu.

author: zener
author_rank: Contributor
timestamp: November 06, 2013, 03:32:51 pm
content: Thank you.I searched the manual for "RMS" and did not find it.I should have played with the buttons more.Thanks,Pete.
Owon SDS7102 Screen Malfunction  - Page 1
Forum section: electronics / testgear

author: geo_leeman
author_rank: Regular Contributor
timestamp: November 05, 2013, 09:46:40 pm
content: Hello all,I've recently acquired a new Owon SDS7102V... I decided to go with this scope over the Rigol per recommendations of several techs. So far I've been generally satisfied, just minor annoyances with the control feel and such. I was measuring a spectrum and all of a sudden two vertical white lines wiped across the screen and the scope completely froze! (See photos) Cycling the soft power switch didn't do anything, I just had a white screen on boot-up. After unplugging the unit for several minutes while I looked through the useless 'Troubleshooting' section of the manual I plugged it back in and all is well. I repeated the measurement and left the scope measuring for several hours multiple times since with no problems. Has anyone else seen this?
How does digital to analog conversion in a DC standard work? (Knick) - Page 1
Forum section: electronics / testgear

author: e61_phil
author_rank: Frequent Contributor
timestamp: November 04, 2013, 06:43:36 pm
content: Hello,at work we have a 5.5 digit Knick DC calibrator. I wonder how the digital to analog conversion works. I can't find any DAC ICs. Is there a method like the dual slope method (A->D) in DMMs used in such devices which build a discrete digital to analog converter with great resolution?PhilippEdit: Sorry upside-down

author: SeanB
author_rank: Super Contributor
timestamp: November 05, 2013, 04:48:29 am
content: Probably a lot of R-2R BCD resistor networks on ceramic substrates that have been laser trimmed, along with a summing network to sum the discrete digits. You will likely see a lot of ceramic blocks with them inside under a shielding cover.

author: e61_phil
author_rank: Frequent Contributor
timestamp: November 05, 2013, 06:42:24 pm
content: No, there aren't any ceramic resistor networks as far as I can see.I can't believe a resistor network will work with 20bit resolution (5.5 digit = 1e6 counts ~ 20bit). The MSB accuracy have to be better than 1/(2^20)?

author: SeanB
author_rank: Super Contributor
timestamp: November 05, 2013, 07:07:20 pm
content: I used to use some BCD ceramic networks that were made specially for the use. Came in a square ceramic block with 20 odd leads on the sides to give a voltage from 0 to Vref ( which was a 5 VAC 400Hz sine wave from the main AC reference generator) that was used to convert the input from a 5 digit BCD switch which had as the MSD a polarity switch. It was pretty stable, the LSD never drifted more than a count over the full operating range ( or from a bath in freezer followed by a cooking from a hot air gun) during testing. There was one trimming resistor for the unit, used to adjust the offset to zero. Typically I used a 1M resistor there to ground, as you needed a resistor in the schematic, but had a choice of connecting the chosen value to ref or GND.
HP 54501A OScope Battery Replacement - Page 1
Forum section: electronics / testgear

author: nathon
author_rank: Contributor
timestamp: November 05, 2013, 01:13:28 am
content: Has anyone had the pleasure of replacing the CMOS (or backup) battery in the HP 54501A oscilloscope?I'm hopefully looking for instructions on where it is, a place to source a replacement and anything to be aware of. I've heard it's integrated into a chip, but not sure how that'd work.On a side note there are a ton of these out there with bad batteries that us beginners are swiping up as first scopes/boat anchors. Might make a good video for Dave to do.CheersNathon

author: reagle
author_rank: Unknown
timestamp: November 05, 2013, 01:47:47 am
content: Not exactly the same scope, but I performed that "surgery" on my HP54645D scope. It came with NVRAM failure message off ebay. Basically, inside was an ST NVRAM chip with integrated battery (Mouser 511-M48Z1810PC1) in a DIP-like package. I desoldered the old part, installed a 28 pin socket an plugged in a brand new one. Then ran self cal and was back in businessThe picture of it is at

author: nathon
author_rank: Contributor
timestamp: November 05, 2013, 06:23:27 am
content: That's exactly what I was looking for. I'll take a look at that and update this post when I make progress on my meter. At least that gives me an idea what I'm looking for. Thanks for the help!
HP 54501A Oscilloscope Issue - Page 1
Forum section: electronics / testgear

author: nathon
author_rank: Contributor
timestamp: November 01, 2013, 05:07:03 pm
content: First let me start by saying I'm a beginner so please take it easy on me.I have an HP 54501A oscilloscope that I have come to realize is not showing the correct voltage. I have found that it is about 10x lower than expected. For example measuring a constant 5v DC voltage source is showing a steady signal, but at approximately 500mv. I tested the voltage source with my nice but off brand meter and it was spot on 5v. I purchased this scope used with just a bad memory battery so it has been like this since I got it.Here is what I've done so far.- Cleared memory on boot and ran through complete calibration routines.- Tested with 2 different probes (with only ref buttons on them).- Ran full diagnostics, even over time and every test passes every time.- Started on service manual checks.- 5v rail was .1v high so adjusted it down to tolerance in service manual.- Ensured scales and everything was adjusted so measurement was easy & even used scope math to measure voltage.- Measured AC & DC calibration voltages and both were good.Anyway, the thing that is weird to me is that it appears to be almost exactly 1/10 the real measurement. If anyone could give me any pointers I would really appreciate it!

author: nathon
author_rank: Contributor
timestamp: November 01, 2013, 05:56:34 pm
content: You know... I was wondering the same thing. The probes only have a single button on them for REF. There's no selection for 1x/10x. I will have to look up the model number to make sure that's not the problem. Thanks for the info.

author: free_electron
author_rank: Super Contributor
timestamp: November 01, 2013, 06:00:56 pm
content: if you go in the vertical menu of the scope you can change probe attenuation from 1x to 10 x or automatic.the scope by default is set to automatic. but this ONLY works of you have probes that can signal their attenuation to the scope. Only the original hp probes and some tek probes can do that. they have an additional pin on the bnc connector.anything else you will ave to set the attenuation manually in the vertical menu . then the scope will show the correct value

author: nathon
author_rank: Contributor
timestamp: November 01, 2013, 06:07:46 pm
content: Perfect! I'll set it to 1x manually and see how that works. Thanks for your help!

author: nathon
author_rank: Contributor
timestamp: November 05, 2013, 01:07:37 am
content: I have a follow up for this question. After looking at my probes I discovered they're 10x probes (10:1) and HP brand. I set the oscilloscope to 10x and all is happy in the world again.What a stupid mistake! Well I feel sheepish. Thanks for the help!
R&S analyzer bios  - Page 1
Forum section: electronics / testgear

author: matt123
author_rank: Newbie
timestamp: November 04, 2013, 12:07:44 am
content: Hello,I'm trying to get into the bios on my ZVR VNA so I can change the boot order and install the software(it didn't come with any). Any help would be much appreciated.Thank you,Matt
Fluke 887A Null Detector Circuit - Page 1
Forum section: electronics / testgear

author: JoeD
author_rank: Contributor
timestamp: November 04, 2013, 06:45:29 pm
content: Does anyone have a circuit for the Fluke 887A (or 883A) Differential Voltmeter that shows an IC based null detector circuit? All the manuals that I can find on line show a discrete transistor amplifier with a mechanical chopper occupying a full length board. The unit I have has a half length board with a single op amp made by Burr Brown and marked KM010 which I have not been able to find on any online searches, presumably it's a custom marked part. The board is marked 887A-4024 and is part number PN812610 Rev C. The unit is currently not working and all indicators are that the fault is on this board. The meter is hard over and on examination all the other circuit blocks appear to do what they should.RegardsJoeD
HP 3478A service manual IC U102 - Page 1
Forum section: electronics / testgear

author: yogece
author_rank: Contributor
timestamp: November 04, 2013, 02:48:47 pm
content: Hi ,i have got the service manual of HP 3478A; on page number 149 schematic of current source(programmable current source) is given.It is used to select the value of particular resistor to change the current; for switching P-MOSFET is used and it is designated as U102 but nowhere i could find the part number.can any one help me?

author: Vgkid
author_rank: Super Contributor
timestamp: November 04, 2013, 03:17:31 pm
content: It looks like a custom componet if it is the fet array.it is part number: 1qf7-0067and it looks to be possible to still buy one from here:http://4gte.com/hp-agilent-1qf7-0067-hybrid-input-board.html
Zico DMM, new kid in town.. - Page 1
Forum section: electronics / testgear

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: November 03, 2013, 04:32:25 pm
content: Came over this site, Zico DMM`s.. funny name do..Israely Company, they should if its buildt there be good.. or maybe a OEM..http://www.zicotech.com/index.asp?id=2161

author: Wytnucls
author_rank: Super Contributor
timestamp: November 03, 2013, 04:47:41 pm
content: probably a CEM meter again...they are everywhere.Similar to this one:

author: chiefengineer
author_rank: Newbie
timestamp: November 03, 2013, 04:50:05 pm
content: Theres nothing that I hate more than uneven backlights...The case looks quite similar to some Extech meters.http://www.google.de/imgres?client=safari&rls=en&biw=1280&bih=703&tbm=isch&tbnid=S9-sd1ztj301OM:&imgrefurl=http://www.voelkner.de/products/13956/Multimeter-digital-Extech-Ex530-TRMS-DMM.html&docid=JTQOL7QH7Phy5M&imgurl=http://www.voelkner.de/products/13956/100-xl.jpg&w=460&h=1000&ei=XX52Ur2bCIXHsgbMtoHYAg&zoom=1&iact=hc&vpx=492&vpy=261&dur=2906&hovh=331&hovw=152&tx=101&ty=218&page=1&tbnh=145&tbnw=66&start=0&ndsp=36&ved=1t:429,r:13,s:0,i:122

author: david77
author_rank: Frequent Contributor
timestamp: November 03, 2013, 04:53:32 pm
content: Of course that's a bloody CEM. Nothing to see here...

author: retiredcaps
author_rank: Super Contributor
timestamp: November 03, 2013, 10:45:24 pm
content: Southwire also started selling CEM multimeters in black/brown color scheme.http://www.southwiretools.com/tools/categories/test-and-measurement
Faulty Crypton engine analyzer  - Page 1
Forum section: electronics / testgear

author: Theron
author_rank: Newbie
timestamp: November 03, 2013, 06:09:24 pm
content: Hello everybody !Im new on this forum. I have this old Crypton-triangle ldt. engine analyzer. The previous owner was modifying it, and now the device doesn't work properly. Im asking for help in search for service manual or schematics.English is not my first language, so please bear with me.Thank you