hybridfree/eevblog-posts huggingface dataset:
Voltcraft ME-32 DMM teardown - Page 1
Forum section: electronics / testgear

author: jitter
author_rank: Frequent Contributor
timestamp: June 13, 2016, 01:10:00 pm
content: My one surviving cheapie multimeter, also my first autoranger.Bought in May 1998 for the (converted) sum of about € 45.It's cheap, and feels it. Lightweight but stiff. The selectorswitch doesn't feel very nice and binds a bit halfway through.It came with testleads, a K-type thermocouple and a pouch. It's powered by two AAA batteries.The biggest drawback: a mechanical power switch that will be operated when something is pushing only lightly on it, and there's no auto power off. On more than one occasion this thing drained the batteries well into leaking electrolyte...Underneath it's a Metex... so why bother with a teardown? Why not...Is there anyhing good about it? Yes, threaded metal inserts and captive screws. And it has ceramic fuses, but the spare 5x20 800 mA fuse I only just now discovered is a glass fuse.

author: jitter
author_rank: Frequent Contributor
timestamp: June 13, 2016, 01:11:23 pm
content: More...

author: retiredcaps
author_rank: Super Contributor
timestamp: June 13, 2016, 03:35:16 pm
content: Quote from: jitter on June 13, 2016, 01:10:00 pmThanks for sharing the pictures. I like meters that use AA and AAA cells as I like using rechargeable ni-mh eneloops.

author: jitter
author_rank: Frequent Contributor
timestamp: June 13, 2016, 06:12:01 pm
content: Aren't there any Eneloop (or similar low self discharge type NiMH) in 9 V versions?
HP 8903B which manual to use - Page 1
Forum section: electronics / testgear

author: Gmanfro
author_rank: Contributor
timestamp: June 13, 2016, 11:29:36 pm
content: Just bought a HP 8903B distortion analyzer serial # 3413A, not sure which manual to use to operate it or do I use both? Seems like the last update stopped at 2450A-2948A and there was a prior one. Seems like there is also a cal manual. This one was just recently calibrated, but want to print a operation manual so I know how to use it properly. Any help on operation or proper manual will be much appreciated.

author: macboy
author_rank: Super Contributor
timestamp: June 14, 2016, 12:59:33 pm
content: The service manual is in two volumes, you need both. There is also an operation/calibration manual. My op/cal manual indicates S/N range 2450A to 2922A. I downloaded these from Agilent directly, and I don't know of a source of better quality or later manuals.

author: Gmanfro
author_rank: Contributor
timestamp: June 15, 2016, 11:47:27 am
content: Thanks, Got the op/cal manual and there is 2 service manuals. Looks like I have them located from Agilent. So 3 manuals in total. Guess my brain was overloaded the other day and just got confused. Thanks for straightening things out.
multi-meter broken :( - Page 1
Forum section: electronics / testgear

author: thefamilyman
author_rank: Regular Contributor
timestamp: June 11, 2016, 03:11:22 am
content: a bit annoying.....doesn't look too easy to replace. I've tried knocking it out with some medium blows but not budging.moral of the story; don't use uninsulated test leads like the one on the left. creates too much leverage on the sockets and causes both metal and plastic fatigue that eventually cracks off.

author: retiredcaps
author_rank: Super Contributor
timestamp: June 11, 2016, 03:37:18 am
content: On ebay, I see a lot of meters with the inner shroud missing presumably due to many insertion/removal or the use of unshrouded test leads. However, I haven't seen one that ripped off the actual metal?.Modemhead, a member here, does some DIY repair. While not the same and I realize materials used are probably different, it may give you some clues/ideas on how to proceed? Seehttp://mrmodemhead.com/blog/fluke-banana-jack-repair/http://mrmodemhead.com/blog/fluke-80-series-jack-assembly-rebuild/

author: ModemHead
author_rank: Frequent Contributor
timestamp: June 12, 2016, 06:46:19 pm
content: You may be able to repair with 3/16" brass tubing like I did in the jack rebuild article posted above. Given that the original doesn't seem all that robust, the result might be quite reasonable.Here's a possible method:Carefully drill out the old stud. Go slow and do not let heat build up that might melt the plastic, and fanatically police any metal shavings.Cut a piece of brass tubing to the appropriate length.Find a washer that solder will stick to. Drill it out to the O.D. of the brass tubing. Solder it onto the end of the brass tube, leaving a generous fillet. Also solder on a wire pigtail for later connection to the PCB.Epoxy the assembly into the plastic post. Solder the wire to the connection point on the PCB. Plug the end of the brass tube with epoxy or something to prevent FOD from entering the meter.The meter should be useable at this point, but for aesthetic purposes, you could get one of those plastic plug inserts from a set of cheap probes, prepare it and glue it to the tube from the front, to make a replacement red inner shroud.
Rigol DSA815 is it worth to buy - Page 1
Forum section: electronics / testgear

author: PsychoBoy
author_rank: Contributor
timestamp: June 10, 2016, 05:54:13 pm
content: Hello, I got presumably simple question, is it worth to buy Rigol DSA815 WITHOUT tracking generator for round about 750 USD? Or is TG actually an essential option and every spectrum analyzer should have one?

author: bson
author_rank: Unknown
timestamp: June 11, 2016, 11:24:25 pm
content: You need the tracking generator to characterize devices and their response. You don't need it to look at signals.

author: xrunner
author_rank: Super Contributor
timestamp: June 11, 2016, 11:30:53 pm
content: Quote from: PsychoBoy on June 10, 2016, 05:54:13 pmPersonally (I own a DSA815-TG) I wouldn't even consider buying one without the TG. Yea you may not need it now, but come the day you do, you'll regret it.

author: jjoonathan
author_rank: Frequent Contributor
timestamp: June 12, 2016, 01:24:09 am
content: There are 815-TGs on ebay for fully 20% off the list price, and you could probably negotiate further because they haven't moved in weeks. If you can afford the few hundred extra I would strongly recommend going for the TG. Otherwise you'll probably wind up swapping it out not too far down the line, and you won't come out ahead.

author: nctnico
author_rank: Super Contributor
timestamp: June 12, 2016, 10:20:08 am
content: OTOH you can do the same with an external RF generator if this is able to do a stepped sweep (most digital controlled ones can do this). Using an RF generator will be slower but an RF generator can be useful for other purposes as well.

author: coppice
author_rank: Super Contributor
timestamp: June 12, 2016, 10:33:55 am
content: Most people never use the tracking feature in their spectrum analysers. Some rely on the feature most of the time. Which category are you in? If, say, you need the machine exclusively to monitor emissions you'll never need the generator. If you are trying to characterise RF bits and pieces you will probably find it a real boon.

author: HighVoltage
author_rank: Super Contributor
timestamp: June 12, 2016, 11:51:48 am
content: I have one older HP Spectrum Analyzer without TG and found the need for a TG, so I bought the DSA815 with TG and really like it. Actually I like it so much, I would never consider a SA again, without a TG.

author: DG5SAY
author_rank: Contributor
timestamp: June 12, 2016, 02:34:14 pm
content: Have a look at the SIGLENT SSA3021X (ad the TG of course).
VICTOR VC921 DMM Integrated Personal Handheld Pocket Mini Multimeter  - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: June 11, 2016, 09:36:08 pm
content: I have a Vichy 921 pocket multi meter just to carry around as a cheap multi meter for quick checks.interestingly all functions seem to work accept the duty cycle function...this seems a bit odd.It can measure duty cycle on a PWM of a function generator. Or duty cycle of 240V A.C mains.However it will not measure the duty cycle on a fuel metering valve PWM signal on a car. It just shows 99%It is able to measure the frequency of the metering valve but why not the duty cycle?Its a 14.Volt PWM signal seems a bit odd other multi meters I have measure the duty cycle no problems.Has anyone else discovered such a problem?http://www.aliexpress.com/item-img/VICTOR-VC921-DMM-Integrated-Personal-Handheld-Pocket-Mini-Multimeter-AC-DC-LCD-Digital-Multimeter-LCR-Meter/32227933928.html?spm=2114.10010108.1000017.2.7rEXYWR_G_B

author: Maxlor
author_rank: Frequent Contributor
timestamp: June 11, 2016, 09:53:35 pm
content: Many multimeters have trouble measuring PWM signals that have a DC offset. Try measuring with a small capacitor inline.
Cheap multimeters with a PC connection - Page 1
Forum section: electronics / testgear

author: TomerP
author_rank: Newbie
timestamp: June 18, 2016, 12:47:12 pm
content: Hello guys,I'm looking to buy 2 multimeters with a PC connection (Serial/USB/whatever) that would be as cheap as possible, as all I need to do is read voltage and current.Any advice?

author: HK3R
author_rank: Newbie
timestamp: June 18, 2016, 03:11:41 pm
content: I have been looking at this one HYELEC MS8236, a rebranded exact version was just reviewed by SteveyG here:https://www.eevblog.com/forum/testgear/mustool-mt826-6000-count-digital-multimeter/Protections are scarce, continuity test seems slow, I found a Russian review site that was able to use the data logging basic SW, this particular model is not yet supported by sigrok.org but is on plan.Not sure if include the link to the Russian site will break any rule so if you want it just PM me.The other option that came to my mind is the UT61E, much better accuracy, same bad protection, some loves it some don´t.I´m actually also looking for a cheap data logging DMM, just for bench work, I was inclined toward the UT61E but seems like it drift a lot within time, not sure if the latest revisions fixed the issue.

author: rsjsouza
author_rank: Super Contributor
timestamp: June 18, 2016, 04:11:10 pm
content: I am not sure how easy it would be to get these in Greece (eBay perhaps?) but reasonably built multimeters with PC connectivity are the RadioShack 2200039 (4000 counts) and 2200087 (6000 counts) - you either would get them NOS or used. A while ago I did a review on them in my blog (link in my signature, but it is in portuguese).Otherwise, as mentioned above the UT-61E variants seems to get some love (and hate too) around.

author: SkyMaster
author_rank: Frequent Contributor
timestamp: June 18, 2016, 04:14:32 pm
content: Quote from: TomerP on June 18, 2016, 12:47:12 pmDigitek DT-4000ZC Data Logging Multimeter$38.99 US, free shippingSold byiloveelectronic, who is a member here.http://www.ebay.ca/itm/Digitek-DT-4000ZC-TekPower-TP4000ZC-Data-Logging-Multimeter-with-Temperature-/200912705694?var=&hash=item2ec754989e:m:mcJBleKfbRy9NFe7RTlR8Rg

author: stevenhoneyman
author_rank: Regular Contributor
timestamp: June 18, 2016, 04:21:37 pm
content: I got this:http://www.stevenhoneyman.co.uk/2016/06/mercury-mttr01-digital-multimeter-600104.htmlIt's based around the same multimeter IC as the UT61D:http://www.ic-fortune.com/upload/Download/FS9922-DMM4-DS-13_EN.pdf

author: retiredcaps
author_rank: Super Contributor
timestamp: June 18, 2016, 04:25:45 pm
content: Quote from: SkyMaster on June 18, 2016, 04:14:32 pmReviewed by Martin. Part 2 has the logging feature.
new clamp meter - Page 1
Forum section: electronics / testgear

author: thefamilyman
author_rank: Regular Contributor
timestamp: June 11, 2016, 08:00:55 am
content: Just got a Fluke 376 to complement my Fluke 325.since the 376/E is an end of line model (only because of the 376/FC, FlukeConnect) it's quite a bit cheaper now.Got it mainly for the larger current capacity of 1000A and 2500A via the very useful iFlex.carry case with everything includedIt's quite a bit larger than the 325. I'll still most probably use the 325 more often because it fits into my toolbox nicely when i go onsite. but the 376 will be extremely useful when i service larger generators and switchboards thanks to it's larger current capacity and the iFlex.
DT-830B multimeter teardown - an unique teardown - Page 1
Forum section: electronics / testgear

author: retiredcaps
author_rank: Super Contributor
timestamp: June 08, 2016, 04:07:42 am
content: Electronupdate, a member here, did a recent teardown of those cheap DT-830B multimeters, but with an unique look starting at the 7:00 minute mark. I won't spoil it for you.

author: Wytnucls
author_rank: Super Contributor
timestamp: June 08, 2016, 06:10:42 am
content: https://learn.sparkfun.com/tutorials/how-chip-on-boards-are-made

author: Jasper
author_rank: Contributor
timestamp: June 10, 2016, 09:48:28 am
content: 8617/8217 sound very familiar to me. I think my cheap-ass meter in the 90s had that as a model number?

author: dannyf
author_rank: Super Contributor
timestamp: June 10, 2016, 10:46:19 am
content: Not bad for an el-cheapo meter. For most people, if they cannot make it work with a $7 830, they cannot make it work with $700 Fluke or Agilent, ....That's the bottom line.

author: saturation
author_rank: Super Contributor
timestamp: June 10, 2016, 12:52:08 pm
content: That stylized "S" looks like the logo of defunct Signetics, among many things, once a giant in the IC world and developer of the 555 timer.
Can the Rigol DS1102D decode I2C - Page 1
Forum section: electronics / testgear

author: ulix
author_rank: Regular Contributor
timestamp: June 05, 2016, 10:16:09 am
content: Hello,Can the Rigol DS1102D like the DS1000Z decode the logic analyser Input Signals?I couldn't find anything in the Handbook...Thank you very much!

author: jlothian
author_rank: Newbie
timestamp: June 09, 2016, 11:37:03 pm
content: No, the 1000D series don't have any protocol decoding options. All you get is 16 digital channels synchronised with the analog ones, and digital pattern triggering.James
Need: Service Manual for VP-960A Voltmeter - Page 1
Forum section: electronics / testgear

author: maxbarjr
author_rank: Newbie
timestamp: June 09, 2016, 10:24:01 am
content: I've just picked up a National Electronic Voltmeter VP-960A from a surplus store. Looked inside, fuse is missing, caps are dirty and some are leaky, some resistors are black perhaps due to overheating. Anybody has a service manual or tell me where to download one?Appreciate it very much.Max
just acquired a Tektronix 2445 with fan problems - Page 1
Forum section: electronics / testgear

author: scottie4442
author_rank: Unknown
timestamp: June 09, 2016, 01:57:07 am
content: Just got a tek 2445 off epay for $125. The seller said that the fan did not work but the scope tested good. When I received it turned it on just to see if the traces came up and the screen showed readout, it did all channels. I did not hear the fan so took off the back, after removing power cord, and to my surprise there is no squirrel cage on the fan motor shaft. Did check to see if the fan would actually turn and the shaft spins freely, but when the scope was powered on the shaft was not spinning somhave to check the power supply later, I do have a complete new power supply coming in form this unit. I am not critising the seller just made me laugh when he said that the fan did not work when the fan blade was not there. I will take pics later and post them, but other than the fan so far this unit looks really good, a little wear on the front (the lettering on top of the screen has the color worn off) but other than that all the knobs are there and the other text on the front cover is crisp. I plan on changing all the electrolytic, just in case, anything else I should change or check, the u800 looks like it is good.

author: tautech
author_rank: Super Contributor
timestamp: June 09, 2016, 02:09:33 am
content: In another thread there was a good trick for Tek fans:https://www.eevblog.com/forum/repair/tek-2445-(not-a-not-b)-repair-u800-fan-etc/msg947145/#msg947145There may be other info in that thread that could be helpful.

author: scottie4442
author_rank: Unknown
timestamp: June 09, 2016, 02:10:47 am
content: Thank will look at that post
HP 33120A Revisions -- Any important lifecycle changes? - Page 1
Forum section: electronics / testgear

author: jeffsf
author_rank: Contributor
timestamp: January 14, 2016, 01:17:21 am
content: I'm looking at a function generator to meet my modest needs and have a couple options for an HP 33120A potentially available.Were there any great/horrible revisions? Was there any point in the model's history where there were significant changes made that should impact my choices?Is there any reason to prefer a later-production MY4000 unit over, for example a US3401 or US3601 revision (assuming same price and condition)?TIA,Jeff

author: HighVoltage
author_rank: Super Contributor
timestamp: January 14, 2016, 12:14:47 pm
content: The only thing I did not like about the 33120A was the fact that it did not have a pulse capability. That is why I sold my 33120A a long time ago and got the 33220A instead.Otherwise I was very happy with my 33120A but I do not remember the specifics of updates after a certain serial number.

author: valgamaa
author_rank: Contributor
timestamp: January 15, 2016, 07:54:16 pm
content: Quote from: HighVoltage on January 14, 2016, 12:14:47 pmThere is a duty-cycle adjustment on the square-wave, which does much the same thing (but I can't remember the range of PW available).

author: Scottjd
author_rank: Frequent Contributor
timestamp: June 08, 2016, 04:07:08 am
content: So your so happy with the 332201A that you sold one in 2015 and picked up another one?Quote from: HighVoltage on January 14, 2016, 12:14:47 pm

author: HighVoltage
author_rank: Super Contributor
timestamp: June 08, 2016, 08:12:22 am
content: Quote from: Scottjd on June 08, 2016, 04:07:08 amThe devil is in the detail (Numbers)Agilent 33120Awas great, but did not have the Pulse capability and I finally sold it.Agilent 33220Ais really great, especially for the Pulse capability, I still have a few of them.Agilent 33500Bis just an amazing generator because of the dual output, I still have a few of them.Here are some pictures to show the difference.Your reference number has a typo and does not exist.In regards to the 33220A, if anyone is interested in obtaining one, make sure to get one that has a serial number that starts with MY44xxxxxx, which is an upgrade from the MY43xxxxxx versions. Interestingly Agilent did not call it the "B" version, as they usually do.
DP832 output tracking  - Page 1
Forum section: electronics / testgear

author: horst
author_rank: Newbie
timestamp: June 10, 2016, 03:44:51 pm
content: Hello everybody!Thanks to Daves videos I just bought a Rigol DP832 Lab PSU.I really like it so far but there's one thing that bothers me a bit.I always thought that if I set it to tracking mode, it will not only track the set voltages but also the ouput voltages, meaning that if one channel is in constant current mode, the other channel will track its voltage.From what I know now, it doesn't work like that. It just tracks the set voltages. Am I right?That would be such a pity. I'm mostly working on audio circuits and it would be nice to have that option, for example for some opamp circuits where one failing power rail would cause the opamp to blow...Is there at least some workaround for this? Like some option, hidden in the shadows of some menu?Any help would be highly appreciated!CheersHorst

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: June 10, 2016, 06:44:27 pm
content: From the DP800 User guide"The track function only tracks the voltage setting value and the actual output voltage will not be affected."The manual mentions this multiple times.

author: horst
author_rank: Newbie
timestamp: June 10, 2016, 07:33:15 pm
content: Quote from: CustomEngineerer on June 10, 2016, 06:44:27 pmYes, I read that. Sorry, maybe I didn't ask the question the right way.I wanted to know if there is some other way to do this. There are a lot of functions in this power supply and I was somehow hoping that there is some hidden feature that I'm not aware of.

author: TurboTom
author_rank: Super Contributor
timestamp: June 10, 2016, 08:50:02 pm
content: It appears that currently there's no way to accomplish this. My approach would have been to enable synchronous switch on/off of the synchronized channels and then enable an overcurrent shutdown on both channels. If the overcurrent limiter trips on any of the two channels, it should take out both channels (since the switch on/off function SHOULD BE syncronized) -- but it doesn't. Only the channel where the overcurrent condition is sensed is shut down, the other one stays enabled. It seems the synchronized switching function actually only supports manual turning on/off of the synchronized channels. Room for firmware improvement it seems...Cheers,Thomas

author: horst
author_rank: Newbie
timestamp: June 10, 2016, 09:07:07 pm
content: Quote from: TurboTom on June 10, 2016, 08:50:02 pmYes, that would be a good way to do it actually. I will write an email to Rigol, it shouldn't be a big deal to implement this in the next firmware update.Let's hope somebody is reading the mails from customers
Agilent/Keysight U8201A test lead kit - Page 1
Forum section: electronics / testgear

author: Jasper
author_rank: Contributor
timestamp: June 05, 2016, 09:12:27 am
content: A random YouTube comment on an AvE video pointed me at these:http://www.keysight.com/en/pd-1654521-pn-U8201A/combo-test-lead-kitThey seem to be available around $30-40. For the amount of stuff you get and the label that's slapped on, that seems like a reasonable deal. Almost no one on the forum seems to have heard of it, though, as far as the Search function knows.Anyone have any experience with them? Are the actual leads good quality, lots of fine strands, silicone? How's the quality of the accessories?How would they compare to Frankie's stuff?

author: TheAmmoniacal
author_rank: Unknown
timestamp: June 05, 2016, 09:54:42 am
content: I'm not a big fan of Keysight's multimeter leads, the quality is fine but they are unwieldy. The leads themselves are adequately soft and flexible, but way too long and rather heavy (more apt for a bench top DMM I'd say). Even the probes are too long for my taste. Probably not a complaint for most people though..I'd recommend the Probe Master 8043SK kit first, or 8043S for a cheaper version:http://probemaster.com/8000-series-standard/

author: Neganur
author_rank: Unknown
timestamp: June 05, 2016, 03:37:06 pm
content: The most annoying thing about the Agilent test lead is that the lead is not always inserted all the way into the probe body and may have an intermittent connection.Another thing to watch out for is that they're safety-shrouded, you can't use the leads with standard 4mm banana sockets (like the uCurrent or whatever).Overall, I'm quite happy with the set but I think Fluke's probe leads are nicer since you have accessories like the thin&flexible extended probe tips.Edit: and in the end are those not all rebranded Probemaster or Pomona leads anyway...?

author: kandrey89
author_rank: Contributor
timestamp: June 05, 2016, 07:16:24 pm
content: Best test leads I've found are Fluke TL175 $30http://www.flukeonlinestore.com/3521976.htmlBeware though, amazon and ebay may sell chinese fakes with gray rubber. Only yellow rubber leads are genuine. Though I did hear gray rubber might be Fluke's version for chinese market, but not sure.I have Fluke TL175 yellow rubber and they are excellent, bought directly from fluke's online store.

author: nanofrog
author_rank: Super Contributor
timestamp: June 06, 2016, 01:39:26 am
content: I'm a fan of Probemaster's9104 Electronic Deluxe Kit.Less weight hanging off of what you're testing than the 8000 series stuff, so they don't slip off as easy. More options as well.

author: zaoka
author_rank: Frequent Contributor
timestamp: June 07, 2016, 03:50:15 am
content: Probe master or Hioki leads.Pomona is not bad as well.I got Agilent probe kit with U3401 meter and it was sitting in the box, I was using probe master.. Maybe that helpsThey were well built, however, not as smooth as Probe master and if you test small resistor values Agilent probes will affect reading. Fluke probes as well... that made me feel like I cant trust this probes ...
Tektronix 2230/2232 DSO cursor option problem... - Page 1
Forum section: electronics / testgear

author: RedPortal
author_rank: Newbie
timestamp: June 05, 2016, 02:37:38 am
content: Hi guys, I bought my first personal (dream come true...) oscilloscope which is the TEK 2230.I was a little disappointed that the cursor was on storage mode.should have done more research but I'm fine with it.The problem is,the delta voltage cursor display's unit has changed from volt to percent.according to the manual, the percent unit is for rise time calculations.But I can't find how to change it back to volts anywhere.The menu clearly has options for switching between 1/dT and dTbut no options for dVAnyone experienced with TEK DSOs, please help me!

author: mettlerr
author_rank: Unknown
timestamp: June 06, 2016, 11:53:53 am
content: Maybe the user and service manuals will help? See here:http://w140.com/tekwiki/wiki/2230

author: David Hess
author_rank: Super Contributor
timestamp: June 06, 2016, 03:24:41 pm
content: I really like the 2230.The cursor readout shows percent when the variable calibration control for the vertical sensitivity it not fully clockwise and in its detent. The variable calibration control is commonly used for lining up transition time measurements on the graticule so this makes perfect sense.If the variable calibration control is out of its detent, then the readout for that channel will show a ">" at the beginning.

author: RedPortal
author_rank: Newbie
timestamp: June 07, 2016, 03:25:16 am
content: Ah! That's the problemThen guess I have to calibrate the scope 'the hard way' by opening this beast up.Thanks SO MUCHyou made my day!!
B&K 1550 based on same design as Tenma 72-8345 and Manson NSP-3630 - Page 1
Forum section: electronics / testgear

author: dh
author_rank: Newbie
timestamp: June 05, 2016, 10:07:51 pm
content: Sorry if this is traveled ground, but I just picked up a B&K Precision 1550 cheap lab power supply. The Amazon reviews are hit or miss, but I figured it was worth the money to get a 'travel size' supply.I was surprised that there are no teardowns that I could find, and not much more than a review or two.Here's what I found when I opened mine up: virtually the same thing that Mike and Phil found.http://jumperone.com/2012/12/manson-nsp-3630-power-supply-teardown/The only difference I saw is that they seem to have updated the power supply PCB to get rid of the resistor on the bottom, and the UI was changed significantly, although the circuit boards behind it look very similar.I saw a couple of things inside that bothered me:1) When trying to disassemble things, the wires chaffed pretty badly on the rough-edged chassis. Not a huge deal if you don't take it apart.2) It is possible to disconnect the GROUND WIRE for the POWER CORD with just a screwdriver from the outside. A lot of times you'll see a grounding screw on the outside of equipment... this is usually(right?) an extra screw that is available to bond the chassis to an external ground.In the case of the B&K 1550, it holds down a ring-lug that grounds the chassis inside, held on by a nut. If you gave it to an enterprising fool, it is possible to loosen that and disconnect the chassis from ground, while leaving a nut to roll around inside. Yikes.Overall if you know what you're doing, not such a big deal, but I'm not sure this unit would pass UL like that!Keywords: B&K Precision 1550, BK Precision 1550, switching power supply, lab power supply
Multimeter UNI-TREND UT51 - copper strips positions needed - Page 1
Forum section: electronics / testgear

author: SaloWay
author_rank: Newbie
timestamp: May 26, 2016, 02:12:49 pm
content: Can anyone post a scheme of rotary switch (namely - copper strips positions) of Uni-t ut51?Thank you in advance!

author: SaloWay
author_rank: Newbie
timestamp: June 05, 2016, 07:47:42 pm
content: Yahoo!I found the correct position!
HP54502A how much shall one pay? - Page 1
Forum section: electronics / testgear

author: MT
author_rank: Super Contributor
timestamp: June 05, 2016, 04:21:24 pm
content: Have traced up a boat anchor HP54502A in reasonable condition, how much should one pay (maximum) for a working unit?

author: MT
author_rank: Super Contributor
timestamp: June 05, 2016, 04:34:54 pm
content: Cant use US prices as guide line, it's a different market, Scandinavian T/M second hand market is stone dead since several years ago so i cant use that either!

author: nctnico
author_rank: Super Contributor
timestamp: June 05, 2016, 05:21:56 pm
content: Well the seller will need to sell it either way so if the local market is dead (and Europe isn't a good used TE market as a whole) he'll end up selling it to a US oriented market. I'd just use Ebay prices for sold listings to get a feel on what is the maximum price.Looking at Ebay they seems to sell in the sub $100 range so I'd start at 50 euro. IF you really want this machine because (IIRC) these have only 6 bit vertical resolution.

author: MT
author_rank: Super Contributor
timestamp: June 05, 2016, 07:24:52 pm
content: Yes i saw it had just 6 bits on the vertical, well i go by the Ebay prices as you mention, at least some sort of guideline at all!
Fluke 12E+ Frequency, Duty Cycle and Temperature Hack - Page 1
Forum section: electronics / testgear

author: crash2140
author_rank: Contributor
timestamp: June 05, 2016, 10:49:45 am
content: So I just came across this AvE video where he opens up his Fluke 12E+ and finds out it's the same pcb for the other more advanced DMM's with frequency, duty cycle and temperature measurement.Pretty darn sweet, for only a few extra bucks than an Extech EX330.Edit: as it seems, this is already being discussed in other topic:https://www.eevblog.com/forum/testgear/fluke-12e-'easter-eggs'/
U1272A Calibration (and BM257s service) - Page 1
Forum section: electronics / testgear

author: Floyo
author_rank: Regular Contributor
timestamp: June 01, 2016, 07:49:30 pm
content: Hi all, some simple measuring in the lab tonight turned into a bit of an annoying situation. Both my u1272a and bm257 "started" acting up at the same time.The BM257s displayed the same symptoms as mentioned herehttps://www.eevblog.com/forum/testgear/brymen-257s-lost-calibration-data/,except it also shows overload on the dcV range. Trying the "fix" in that thread did remove the error, but the dcV range still refuses to work.Luckily I bought this meter a little over a year ago, so it should still be within warranty, and I'll contact the guys mentioned in the other thread.Now, to the other meter, in short, its out of cal. by roughly .4% on the DC and ACv ranges. the DC mV range is still bang on compared to my BM867 and 33401a.According to the 1 year spec. on the cal. cert. of +/-0.0667% multiplied by the roughly 6 years it has been since the factory cal. happened the drift could be as much as0.4%, so that makes sense at least.Now, for the main question, where can I get this meter calibrated (for a fair price) in Europe. Keysights own option is in the US, and counting in shipping and the inevitableimport tax (even though its my own meter) this makes no economic sense.http://www.keysight.com/en/pd-1896657-pn-U1272A/handheld-digital-multimeter-45-digit-water-and-dust-resistant?cc=NL&lc=dutSorry for the waffle, had to rant a bit, my poor meters

author: boggis the cat
author_rank: Regular Contributor
timestamp: June 02, 2016, 01:59:56 pm
content: You should be able to search for calibration labs local to you. Try "calibrate multimeter" or the equivalent in local languages. If you don't care about the accuracy as it is now, then ask for a quote for adjustment to specifications then calibration.Some labs will offer different options and prices based on information such as whether you require comprehensive data, ISO 17025 compliant certificate, etc.If I recall correctly, there are labs offering such service starting at around £50 or so in the UK. Possibly you can find even less expensive options elsewhere in the EU.

author: Floyo
author_rank: Regular Contributor
timestamp: June 04, 2016, 06:41:34 pm
content: I had some more looking around, and no place specifically mentions Agilent gear, but I did find the cal manual for the meter, so I'm sure those guys at the cal lab can figure that out too.No concrete prices either, so I'll have to send out some emails and see which numbers come back.
6 bit Frequency Counter - Page 1
Forum section: electronics / testgear

author: metrologist
author_rank: Super Contributor
timestamp: June 03, 2016, 09:29:08 pm
content: I was reading specs on a hardware counter that said it was 6 bit. What does that mean, other than 6 bits has 64 possibilities? I think there's a typo because the counter shows 6 numerical digits...

author: Maxlor
author_rank: Frequent Contributor
timestamp: June 03, 2016, 09:48:52 pm
content: I'm guessing, a chinese/english translation error, and digit is what they really meant.

author: billfernandez
author_rank: Regular Contributor
timestamp: June 04, 2016, 07:13:53 am
content: Or maybe they're specifying the price as $0.75 USD.

author: metrologist
author_rank: Super Contributor
timestamp: June 05, 2016, 01:40:35 am
content: This is in the Rigol DS1054Z spec sheet, for its hardware freq counter... I became interested when reading a post that illustrated the scope displaying a 400 MHz+ plus signal and questions about its freq counter, and additionally the counter's accuracy.
SDS1102CNL vs SDS1102CNL+ - Page 1
Forum section: electronics / testgear

author: tango48
author_rank: Newbie
timestamp: June 04, 2016, 11:47:06 am
content: Just ordered a SDS1102CNL from China, but when it arrives, it is a SDS1102CNL+. Any idea what's the different between CNL vs CNL+?

author: rf-loop
author_rank: Super Contributor
timestamp: June 04, 2016, 12:44:38 pm
content: Quote from: tango48 on June 04, 2016, 11:47:06 amIn Europe DL+ and CML+ have increased TFT resolution (physical size is same 7") and added LAN. (SDS1052DL+, SDS1072CML+, 1102CML+, 1152CML+)But SDS1102CNL or SDS1102CNL+ is not at all in our market area anymore.Edit: It exist in Siglent China (where is also other models what we do not have here)It is like old SDS1102CNL exept + model have this higher TFT resolution and LAN, just as DL+ and CNL+ models in Europe.Display resolution you can also easy chec example: take TFT image to USB stick and look this image size.In attached image added LAN in new + models.
Rigol MSO1000Z LA fault (SOLVED) - Page 1
Forum section: electronics / testgear

author: Howardlong
author_rank: Super Contributor
timestamp: June 09, 2016, 08:56:17 pm
content: FolksA few months ago I noticed some strange behaviour on a couple of the digital channel on my MSO1074Z-S. Although a signal was showing, the high time was very short, much shorter than expected, of the order of about 15ns or so when the width was really about 40ns in a specific test I made up to reproduce the problem. Other digital (and analogue) channels on the same signal were fine.The problem was intermittent but more recently it became almost permanent on one of the channels. Because it's my field scope, it doesn't get much use in the lab, so I never got around to fixing it until now.To cut a long story short, it turned out to be a very mundane fix: clean out the cable and scope connectors with a quick spray of IPA and an air duster. I assume one of the differential connections from the cable connector wasn't making contact.Frustrating, because I went as far as having the probe apart, and was probing the probe... which is why one scope is never enough!Hopefully this'll help others if they encounter a similar fault.

author: saturation
author_rank: Super Contributor
timestamp: June 10, 2016, 12:39:58 pm
content: Yes, in the end its always better to have at least 1 backup of everything to check the failed one against; it may not be faulted. As a rule I keep at least 3 of everything in stock, ready for use.
Rohde RTO1044 sample rate - Page 1
Forum section: electronics / testgear

author: kazam
author_rank: Regular Contributor
timestamp: June 03, 2016, 09:14:44 am
content: Hi,I have a R&S RTO1044 which is a 4 GHz 20Gsps model. Now I need to sample a baseband voltage output and I plan to use 16,24,or 32MHz sample clock for the ADC. So it would be helpful to use these exact sample rates for the scope in order to get some real world data.However, it seems to be only possible to set even sampling intervals in tenths of ns which of course only gets you so close. Anyone experienced this?/K
Distortion Analyzer what type of cables to use - Page 1
Forum section: electronics / testgear

author: Gmanfro
author_rank: Contributor
timestamp: June 02, 2016, 01:13:31 pm
content: Trying to find out what type of cables (not brand) people use on their analyzers. I have a Sound Technology 1700B, with no reference on cables to use from the manual. I do know to use twisted/shielded pair for the inputs to the analyzer from the DUT. Question would be1- What type of cables do you use for outputs from the analyzer to the inputs of DUT. This would be the signal and voltage going to the DUT. RG58, RG59,regular rca cables or something different? The connectors are not the issue it would be the proper cable type to use.2- What cables to use from the analyzers 2 outputs (signal & distortion output) to the oscilloscope (BNC). Should it be RG58 50 ohm, RG59 75 ohm and do I need a 50 ohm min loss pad on it going into the oscilloscope. I have a older Iwatsu analog scope, but will be buying a Rigol digital scope soon.Any help would be appreciated, since the manual has no reference on these cables. I've searched, but not sure what to use.
BM235 InEr appears randomly - Page 1
Forum section: electronics / testgear

author: Maxlor
author_rank: Frequent Contributor
timestamp: May 31, 2016, 03:48:03 pm
content: On my BM235, "InEr" sometimes shows up randomly when it shouldn't, accompanied by a short beep, usually right after switching to a new mode. At the moment I can get it to happen pretty reliably by switching from AutoV through OFF to V quickly with no probes connected, but every so often it would also happen when switching from V to Ohms mode.Is this normal, are other people seeing it too, or is something in my meter on the brink of failure? If it's nothing to worry about, is there a reason other than "firmware bug" why it might be doing that (maybe something along the lines of residual charge in the split jacks or something?)

author: MarvinTheMartian
author_rank: Frequent Contributor
timestamp: June 01, 2016, 01:29:14 am
content: Quote from: Maxlor on May 31, 2016, 03:48:03 pmI've never seen this error on mine. Can't replicate it using your method above either.Something slightly dodgy with your unit?

author: mettlerr
author_rank: Unknown
timestamp: June 01, 2016, 01:33:45 am
content: I am having this too, but only if I switch through OFF. Very short "InERR" on the display and a short beep. But it's not long on there enough to bother me at all. Couldn't get it to show up until now by switching anywhere between V and uA. Maybe it resets somehow if you switch the range switch through OFF?

author: EEVblog
author_rank: Unknown
timestamp: June 01, 2016, 03:26:36 am
content: Confirmed:

author: Maxlor
author_rank: Frequent Contributor
timestamp: June 01, 2016, 05:05:02 pm
content: Thanks for the responses guys. If many or even all meters have this behaviour, I guess then it's ok. I was worried about there being an intermittent contact or something like that which would get worse with time.

author: GEuser
author_rank: Frequent Contributor
timestamp: June 02, 2016, 02:26:26 am
content: One could nearly say that it is working normally depending on which way one looks at it .InEr = input errorThe meter has decided that there "is" a error on the input (no leads attached) but then quickly decides hey what's the drama there is no leads attached so no-one can get hurt so "Whatever anyway" and turns off the InEr .Then the meter says to itself (all meters do this btw , talk to themselves) , only if they knew what we have to put up with with all those strange users out there !imo of course .

author: Maxlor
author_rank: Frequent Contributor
timestamp: June 02, 2016, 11:26:53 am
content: Quote from: GEuser on June 02, 2016, 02:26:26 amExcept of course the behaviour shown in the video above appears regardless of whether leads are plugged in (correctly) or not at all. Same with the rare spurios errors I've seen at other times. In any case, the meter only checks whether leads are connected to the mA and A jacks, there's no provision for checking the COM or V jacks.
Info needed on Ballantine 3440A RF Millivoltmeter - Page 1
Forum section: electronics / testgear

author: N8AUM
author_rank: Regular Contributor
timestamp: May 29, 2016, 09:35:22 pm
content: Hello all,I just purchased this 3440A RF multimeter complete with 2 sets of 50 ohm RF probes and two 100:1 50 ohm T adaptors.After calibration from Ballantine back in September 1989 it has been in a box until last week when I pulled it out and plugged it in.As far as I can tell it STILL WORKS and it looks brand new !Doing a quick search for a user's manual yielded zip so hopefully someone out there might have one for this beauty ?

author: radhaz
author_rank: Regular Contributor
timestamp: May 29, 2016, 10:22:49 pm
content: Ballentine appears to still be doing business.http://www.ballantinelabs.com/manuals.htm

author: N8AUM
author_rank: Regular Contributor
timestamp: May 29, 2016, 11:01:28 pm
content: radhaz: tnx for the quick reply ! I saw that but $100 is a bit way tooo far out of reach for me for just a manual

author: N8AUM
author_rank: Regular Contributor
timestamp: May 31, 2016, 06:34:18 pm
content: Great news,the folks at Ballantine Laboratories, Inc. just sent me the manual which also includes the alignment procedure AND schematic !

author: Vgkid
author_rank: Super Contributor
timestamp: May 31, 2016, 10:46:55 pm
content: That is good news. Their manual pricing drove me to buying one on epay for my 323-07 meter.

author: N8AUM
author_rank: Regular Contributor
timestamp: May 31, 2016, 11:18:33 pm
content: Nice meter, how much did did the manual cost on epay ?

author: Vgkid
author_rank: Super Contributor
timestamp: June 01, 2016, 12:17:05 am
content: Quote from: N8AUM on May 31, 2016, 11:18:33 pmi argued them down to 15, wanted 30. Plus 12 in shippingThat 12 in shipping confused me.

author: N8AUM
author_rank: Regular Contributor
timestamp: June 01, 2016, 12:37:20 am
content: Quote from: Vgkid on June 01, 2016, 12:17:05 amWas that for a paper copy or CD ?

author: Vgkid
author_rank: Super Contributor
timestamp: June 01, 2016, 02:38:28 am
content: Paper, but it was a copy.
Ordered a UNI-T UT61E on Amazon and received a Tek Power UT61E - Page 1
Forum section: electronics / testgear

author: superfreq
author_rank: Newbie
timestamp: May 26, 2016, 06:19:51 pm
content: I bought this for $44.49 USD. As far as I can tell it is identical to a UNI-T branded meter. It works well but has a different board layout compared to teardown videos I have seen. There is no UL E number printed on the circuit board that I've seen in the teardown videos.Did I get ripped off? Is Tek Power just an OEM for UNI-T or vise versa? What do you think?Thankssuperfreq

author: rsjsouza
author_rank: Super Contributor
timestamp: May 26, 2016, 06:36:50 pm
content: Well, since you are in the US and Tekpower is located in the US, perhaps you can get better support from them (althoughtheir websitedoes not instill much confidence).Interesting to see it has a different layout, but IIRC Uni-T has done a few redesigns on this popular model. One thing I would do is carefully compare your board to other UT61 variants (B, C, D).

author: joeqsmith
author_rank: Super Contributor
timestamp: May 27, 2016, 12:37:12 am
content: Assumed you looked at the 61E thread and know there are several versions of PCB for that version of meter. A picture of your board would have been more helpful than the outside of the case. Let's see what it looks like! Maybe you have even another version!Quote from: superfreq on May 26, 2016, 06:19:51 pm

author: superfreq
author_rank: Newbie
timestamp: June 01, 2016, 09:26:18 pm
content: Sorry it took so long to reply. Attached photos show it is the newest version of the 61e.

author: joeqsmith
author_rank: Super Contributor
timestamp: June 01, 2016, 11:52:54 pm
content: Looks like you received what you wanted then.It appears to look just like 5KY's 61E. The soldering and workmanship on his looked pretty good. How's yours?I thought about getting a few of these to run some tests after people were posting about adding MOVs for some reason or another. There were so many different flavors of the 61E it would have made it near impossible of a task.Quote from: superfreq on June 01, 2016, 09:26:18 pm
Can the rigol  DS2072A still be hacked with the latest firmware ? - Page 1
Forum section: electronics / testgear

author: Aztlanpz
author_rank: Regular Contributor
timestamp: May 31, 2016, 05:38:12 pm
content: I am thinking on buying today if they are sill can be hack. To add all the functions and bw

author: Aztlanpz
author_rank: Regular Contributor
timestamp: June 01, 2016, 01:03:52 pm
content: Anyone know

author: nrxnrx
author_rank: Unknown
timestamp: June 01, 2016, 05:35:15 pm
content: Hi!I don't have the DS2000, but many here do. If Rigol ever do such a thing, expect it to be very,veryvisible here. (unless of course, you're the first to find out)It's an $800+ bet, but I'd take it. At most, you lose ~$100 of the resale value if you're among the first to find out Rigol decided to cut their sales volume.That said, this other thread made a bit of an impression:https://www.eevblog.com/forum/projects/project-yaigol-fixing-rigol-scope-design-problems/.--Mihai

author: MarkF
author_rank: Super Contributor
timestamp: June 01, 2016, 08:19:21 pm
content: I don't have a ds2000 series scope. However, the last several pages of the monster thread have detailed instructions which may answer your questions. Start atDave92F1 hack summaryin the "Sniffing the Rigol's internal I2C bus" thread.

author: Fungus
author_rank: Super Contributor
timestamp: June 01, 2016, 09:18:46 pm
content: Quote from: nrxnrx on June 01, 2016, 05:35:15 pmYes, you'd definitely feel a big disturbance in The Force if that ever happened.