hybridfree/eevblog-posts huggingface dataset:
Peaktech 3440 - Software problem solved - Page 1
Forum section: electronics / testgear

author: Awap
author_rank: Newbie
timestamp: November 20, 2017, 01:23:40 pm
content: I bought the Peaktech 3440 because I liked to have a simple portable graph/data logger.Because there is not a lot of info on this meter in the various fora, I like to share my experiences.Was happy with my trusty old Voltcraft M3860M and VC820. Both have a RS232 connection, connected to a RS232 to USB cable, to Wifi Hub, to the Windows PC with LogviewBut too much wires and not too much transportable and flexible.I like the 3440:- Screen graphs good resolution, readable, doesn't scratch easy.- Battery life 8 hours, 3 hours charging. But one hour charging is good for again a few hours logging.- Data transfer fast. A full set of 10000 data lines will take 1 to 2 minutes downloading to the PC.- It's accurate.- Like the 50000 counts range while measuring LiPo's.- Options and menu's are nice to work with.Dislike:- No ON/OFF switch, nice to have if you are using always the same measurement mode.Like to share my problems setting up the software on my WIN10 Home PC:Setting up the PC software took me 4 hours.Couldn't get it to work with a Blue Tooth dongle but with the enclosed Peaktech dongle it worked at the end.My problem was that during "Scanning device" the 3440 was found (with RSSI reading) but the "multimeter.exe" program immediately closed with an error.Sollution: run the "mulimeter.exe" file under "Vista service pack 2 compatibility mode" . Administrator rights not needed.Question:The android app's "Meterbox Pro" and "Peaktech Multimeter" work, the logdata is saved. But I'm not able to share the logs via email or *.CSV. Also the logdata is not accessible in the Android system (hidden files allowed). Android problem or App problem?Happy with the 3440.
Eevblog -Bryman DMM question  - Page 1
Forum section: electronics / testgear

author: Russ
author_rank: Regular Contributor
timestamp: November 18, 2017, 01:29:14 am
content: HelloI just received my EEVBLOG-Bryman DMM. Looks to be a nice unit. However, what is that little magnetic string holder for, how does it work?Thanks

author: iainwhite
author_rank: Unknown
timestamp: November 18, 2017, 05:58:28 pm
content: It slides into the back of the blue holster to act as a hanger or mag-mount. If you can't work it out, I can post a couple photos to help.

author: Russ
author_rank: Regular Contributor
timestamp: November 18, 2017, 07:01:50 pm
content: IanThat would be great.Thank youRuss

author: Russ
author_rank: Regular Contributor
timestamp: November 18, 2017, 07:09:02 pm
content: IanI figured it out. I was overthinking it 😬. Not the snuggest Of fits. It does not fall out?ThanksRuss

author: iainwhite
author_rank: Unknown
timestamp: November 18, 2017, 08:48:43 pm
content: Russ,See photo for how I attached mine. The raised tab on the holster retains the underside of the hanger once it is pushed in.Iain

author: Russ
author_rank: Regular Contributor
timestamp: November 18, 2017, 09:01:59 pm
content: IanThank you. I figured it out. I was overthinking it. Is it a snug enough fit to prevent it from falling out? How do you like the Meter? I just received mine.Russ

author: iainwhite
author_rank: Unknown
timestamp: November 18, 2017, 09:14:40 pm
content: Quote from: Russ on November 18, 2017, 09:01:59 pmIt seems snug enough to me. I tend not to use the hanger all that much, but it seems fine when I do. The magnetic mount works fine stuck to a vertical surface like a filing cabinet.Main reason for buying was to support Dave, but it is also a really nice meter to use. I am hoping to buy it's big brother (EEV 121GW) soon!

author: Russ
author_rank: Regular Contributor
timestamp: November 18, 2017, 09:16:08 pm
content: 👍
Agilent U3606B Multimeter| DC Power Supply Schematics? - Page 1
Forum section: electronics / testgear

author: patpat
author_rank: Contributor
timestamp: November 18, 2017, 04:21:17 pm
content: Hi guys,any tip on getting the U3606A/B schematic?The Service Guide for the U3606B is available but no schematic in it.https://literature.cdn.keysight.com/litweb/pdf/U3606-90069.pdf?id=2401381Is the U3606B similar to some other unit with schematic available?Thanks.
Agilent U1732B LCR Meter lot on (US) eBay - Page 1
Forum section: electronics / testgear

author: rheb1026
author_rank: Regular Contributor
timestamp: November 17, 2017, 02:30:24 pm
content: I was perusing ebay and came across a listing for an Agilent U1732B LCR Meter. $99 plus shipping. There are 11 left as of writing this, and they look to be in great condition so I couldn't resist picking one up.I hope this is the right place to pass along the info. If the link below doesn't work a search for "U1732B" will bring it uphttps://www.ebay.com/itm/Agilent-U1732B-Handheld-LCR-Meter-Used-very-clean-tested-in-spec/142581298890?epid=1701671838&hash=item213281f6ca:g:MFsAAOSw4PxaC4pp

author: skander36
author_rank: Frequent Contributor
timestamp: November 17, 2017, 02:55:43 pm
content: Thanks for info .US location ... bye bye beautiful ...

author: saturation
author_rank: Super Contributor
timestamp: November 18, 2017, 12:39:09 pm
content: Good find, all gone.
Video: Vintage Tech: A look at a 45 yr old Sencore TC162 Tube (Valve) Tester - Page 1
Forum section: electronics / testgear

author: w2aew
author_rank: Super Contributor
timestamp: November 18, 2017, 07:25:41 pm
content: My latest short "vintage tech" video features a Sencore TC162 Tube Tester. I review the features, how to use it, and even a peek inside...

author: rsjsouza
author_rank: Super Contributor
timestamp: November 18, 2017, 08:33:40 pm
content: Bookmarked! Will watch as soon as the kids go to sleep.
Extech calibration/adjustment procedure? - Page 1
Forum section: electronics / testgear

author: kc9qvl
author_rank: Regular Contributor
timestamp: March 23, 2014, 09:12:14 pm
content: Just got a new Nist calibrated fluke 87 and was comparing to my ex520 and ex410. The 520 is close at 410 is off. Could not find the calibration procedure on extech website. Not in user manual. I did send an email to tech support. See if they reply. So anyways does anyone know what the different trim pots do? Has vr1 to vr5.

author: kc9qvl
author_rank: Regular Contributor
timestamp: March 23, 2014, 10:38:21 pm
content: Turned some pots so this what i came up with FOR THE EX410.VR1 IS DC VOLTSVR5 IS AC VOLTSVR2 TEMPERATURE IN CVR3 TEMPERATURE IN CVR2 AND VR3 work together. Used ice water and boiling water and adjusted both till got 0 C and 100 CVR4 TEMPERATURE IN FVR4 is adjusted after vr2 and vr3.

author: kc9qvl
author_rank: Regular Contributor
timestamp: March 25, 2014, 12:59:07 pm
content: Well I was almost correct.Quote

author: retiredcaps
author_rank: Super Contributor
timestamp: March 25, 2014, 01:50:39 pm
content: Quote from: kc9qvl on March 25, 2014, 12:59:07 pmAre these instructions cut and paste from Extech tech support or some manual? They obviously mean coarse, not course.Is there no adjustment for DCV?

author: kc9qvl
author_rank: Regular Contributor
timestamp: March 25, 2014, 08:22:49 pm
content: Cut and paste from pdf manual from Extech tech support.I'm going to recheck this for dcv. Pretty sure the only one the affected vac was vr5 and vdc vr1Not sure how to generate 750 C stable best I can do is 500 c.Also for the ex520Quote

author: cfkerchner
author_rank: Newbie
timestamp: November 18, 2017, 02:28:44 am
content: Can you provide the "calibration procedures" for an Extech 22-816 True RMS Multimeter? In particular the appropriate variable resistor to adjust to calibrate the VDC and VAC readings for the meter. Thank you in advance.
HP E3630A buzz - preregulator or transformer? - Page 1
Forum section: electronics / testgear

author: bd139
author_rank: Super Contributor
timestamp: November 17, 2017, 07:24:51 am
content: Got myself an HP branded E3630A dated around 1999 the other day and it’s buzzing at 50Hz when not under load. I know the preregulator on early units is a bit wonky on these as there’s a missing pull up. Is there any way to isolate this or the transformer conclusively. Not a problem if it does buzz, but would rather fix it if it’s the preregulator as this has some other side effects.
How common is "low power ohms" in a DMM these days? - Page 1
Forum section: electronics / testgear

author: cvanc
author_rank: Frequent Contributor
timestamp: November 16, 2017, 07:52:27 pm
content: So the Fluke 8060a is famous for (among other things) having low power ohms. This means a low test voltage is applied when in resistance mode so no semiconductor junctions turn on, allowing more accurate in-circuit resistor measurements.This was pretty revolutionary way back when, but is it common in modern meters? Or still fairly rare?

author: retiredcaps
author_rank: Super Contributor
timestamp: November 16, 2017, 08:04:08 pm
content: This has been discussed a few times ...https://www.eevblog.com/forum/beginners/do-dmms-in-resistancediode-mode-damage-components/https://www.eevblog.com/forum/testgear/multimeter-with-low-continuity-test-voltage/and possibly more, but I have no time to search right now.
Prologix USB-GPIB interface with softplot - Page 1
Forum section: electronics / testgear

author: PA5Y
author_rank: Newbie
timestamp: November 14, 2017, 12:57:12 pm
content: Can anybody who uses Softplot with a Prologix USB-GPIB interface give me the settings that they are using. I am able to plot from my HP-8711/12B using KE5FX's 7410.exe but I cannot get the interface to work in softplot. It is quite an old version of softplot from previous employer who went belly up, however I can use the LAN interface with my Agilent E4406B without any problems.RegardsConrad PA5Y

author: PA5Y
author_rank: Newbie
timestamp: November 16, 2017, 10:16:37 am
content: So no-one is using Softplot with a Prologix interface? I find that surprising. It is listed as a supported interface on the Aphena website.I'll have to ring Chris Potter.RegardsConrad
Rent or buy a scope for entry-level use? - Page 1
Forum section: electronics / testgear

author: jmw
author_rank: Frequent Contributor
timestamp: November 14, 2017, 10:16:38 pm
content: I think a scope will be useful in a SMPS design I am building for a hobby project, and probably something around a 100 MHz entry-level model should be adequate. As much as I'd like the geek cred of owning a scope, it might see sporadic use after I'm done until I pick another project. Is it more economical to rent a 2000-level scope for a few months vs. buy a 1000-level? Are there rental companies you have used successfully for low-end equipment for personal projects?

author: jmw
author_rank: Frequent Contributor
timestamp: November 14, 2017, 10:26:26 pm
content: Boost converter from 5 V to 130-140 VDC < 10 mA. Not low-voltage but not mains connected either.

author: texaspyro
author_rank: Super Contributor
timestamp: November 15, 2017, 12:57:45 am
content: Have you ever priced renting test equipment? It's rather rare that you can rent something for a couple of months for less than you can buy something quite usable on Ebay for. It may not be the latest, swootiest, shiny... but it will get the job done. Of course, when Ebay is involved, buyer beware and do your homework.

author: AmadeusMozart
author_rank: Newbie
timestamp: November 15, 2017, 01:58:49 am
content: I have found that when I needed specific tools it was cheaper to buy and then sell it off after finished using it rather than renting. YMMV.AM

author: DaJMasta
author_rank: Super Contributor
timestamp: November 15, 2017, 05:04:08 am
content: Quote from: AmadeusMozart on November 15, 2017, 01:58:49 amAnd if it's really entry level stuff you're looking for, it may still be cheaper to buy and keep than needing to even sell it. Good entry level scopes aren't hard to come by and come in several flavors, better used scopes are fairly similarly easy, though you may have to go back a couple of product generations to fit within the same budget. If you're worried about voltage spikes, you could even pick up a 100x passive probe to be sure for quite cheap.

author: jmw
author_rank: Frequent Contributor
timestamp: November 16, 2017, 02:17:27 am
content: So I asked Testequity for info on renting a 200 MHz DSOX2024A and they quoted a rate of $100/mo, which sounds pretty good compared to a new 1000X or even a 1000 series scope. Anyone have dealings with them for rentals?

author: daybyter
author_rank: Frequent Contributor
timestamp: November 16, 2017, 04:38:04 am
content: Maybe there is a hacker space near you, where a scope is available for free? Also look for ham radio clubs or vintage computer meetups. This could be the cheapest solution.
Cloned EEVblog DMM - spoof - Page 1
Forum section: electronics / testgear

author: TheNewLab
author_rank: Frequent Contributor
timestamp: November 07, 2017, 12:13:21 am
content: I posted a while back a Chinese cloned EEVblog Bryman DMM. I also posted two photos.I am so sorry I forgot about it..I included two photos.TRUTH, it was Dave's DMM. I had gotten to talking with Frankie and came up with the idea of spoofing everyone on this site and see who bit. The actual photos were Dave's Bryman DMM cloaked in a Red boot, a Chinese fake Fluke K type thermocouple,and a Mastech pair to test leads.I am guessing that Dave or a super sued yanked it. I took to long to follow up and confess.Sorry, it was all in funRic

author: Mr. Scram
author_rank: Super Contributor
timestamp: November 07, 2017, 12:18:33 am
content: The thread is linked below, but looks an awful lot like spam due to the links you added to it. I sincerely hope it was a joke, because if it's an attempt to grab attention for commercial purposes, it is a great way of damaging your brand.https://www.eevblog.com/forum/testgear/countefeit-multimeters!/msg1292955/#msg1292955

author: Russ
author_rank: Regular Contributor
timestamp: November 18, 2017, 01:26:59 am
content: HelloI just received my EEVBLOG-Bryman DMM. Looks to be a nice unit. However, what is that little magnetic string holder for, how does it work?Thanks

author: Simon
author_rank: Unknown
timestamp: November 18, 2017, 09:07:45 am
content: Quote from: Russ on November 18, 2017, 01:26:59 amPlease don't hijack threads or double post, it's very bad etiquette.
Philips PM 3055 Oscilloscope – set/save startup settings? - Page 1
Forum section: electronics / testgear

author: wellewellew
author_rank: Newbie
timestamp: November 15, 2017, 09:24:22 pm
content: I've had a Philips PM 3055 with its soft buttons for a few years now that I only use in XY mode.It's become a silly ritual of turning it on and immediately pressing X-DEFL then A/B twice to get it into that mode.However, is there a way to avoid doing this?? Does anyone with this scope know how to set/save/store a setup from the soft buttons so it would always startup in that mode (also with a particular V/CM, say .5)? This is where those physical buttons/knobs shine.. but the display of this one is soooo nice!I've read the manual and was optimistic that the 'auto set' button would offer such function, but I couldn't get anything to save past a power off/on...

author: HalFET
author_rank: Frequent Contributor
timestamp: November 15, 2017, 09:32:57 pm
content: It probably stores the settings somewhere in a RAM or flip-flop, so you'd have to power it some other way.
Kaise SK-6500 Digital Multimeter Teardown - Page 1
Forum section: electronics / testgear

author: SinsBird
author_rank: Newbie
timestamp: November 14, 2017, 08:56:35 pm
content: I love it. Looks like Beckman CircuitMate DM77.

author: HalFET
author_rank: Frequent Contributor
timestamp: November 14, 2017, 09:03:18 pm
content: I like how they soldered a sense wire onto the current shunt.

author: SinsBird
author_rank: Newbie
timestamp: November 14, 2017, 09:10:34 pm
content: Haha, how come I did not notice that

author: Kleinstein
author_rank: Super Contributor
timestamp: November 15, 2017, 05:57:27 pm
content: It looks like the fuse is for the batteries, not the current ranges.It also looks like there is even a white wire bridging the fuse.The sense wire on the shunt can be a way of adjustment.

author: gardner
author_rank: Regular Contributor
timestamp: November 15, 2017, 07:12:19 pm
content: Quote from: Kleinstein on November 15, 2017, 05:57:27 pmWhat looks like a jumper across the fuse is the white and grey wires that lead down to the selector switch and AMPs input area on the other side of the board. I think the fuse is physically located near the batteries only so that a single access panel is needed for both.
Opinion of "C&C" brand frequency counters/universal counter/timers? - Page 1
Forum section: electronics / testgear

author: cdev
author_rank: Super Contributor
timestamp: November 15, 2017, 04:47:19 pm
content: Hi,For quite some time Ive been seeing very cheap "C&C" timer/frequency counters/universal counters on auction sites. Some are "for parts or not working" some are sold as functional.Are they any good, does anybody have any experience with them? Are they a rebrand of some better known manufacturer's HW? (which maybe has better documentation?)

author: Mr. Scram
author_rank: Super Contributor
timestamp: November 15, 2017, 04:59:15 pm
content: Quote from: cdev on November 15, 2017, 04:47:19 pmDo you have a link? My regular sources don't seem to recognize that description.

author: cdev
author_rank: Super Contributor
timestamp: November 15, 2017, 05:22:08 pm
content: Just found some more info...There was a thread here (which didn't show up in the site search, for some reason) a few months agohttps://www.eevblog.com/forum/testgear/el-cheapo-cc-model-150u-frequency-counter-help/where I found this.http://www.elexp.com/PDFs/01FC150U.pdfApart from it taking an external time base input, it doesn't look that interesting. Even at the low price.It might be useful to schools though. But I need a bit more in the way of other functionality.

author: Mr. Scram
author_rank: Super Contributor
timestamp: November 15, 2017, 05:34:45 pm
content: They look for all the world like the units made by LG or EZ Digital, which is the same manufacturer at different points in time.
Rigol DS2072A - Page 1
Forum section: electronics / testgear

author: Aztlanpz
author_rank: Regular Contributor
timestamp: November 15, 2017, 05:12:49 am
content: I can buy a new Rigol ds2072A for $579, is that a good price?Thank youAztlan

author: JDubU
author_rank: Frequent Contributor
timestamp: November 15, 2017, 06:03:14 am
content: If it is truly new, in its original unopened box from Rigol, with free shipping, and no tax then it would definitely be a good deal.I see that price listed from a third party seller on Amazon:https://www.amazon.com/gp/offer-listing/B00H80HJ8Q/ref=dp_olp_new_mbc?ie=UTF8&condition=newBut take a look at the seller's reviews. Multiple reports of receiving used products, sold as new. It is fulfilled by Amazon, so you can return it but...TEquipment is a well established, reputable US vendor that offers a small discount for members of this blog (order directly from them by phone to get the EEVblog discount).

author: Aztlanpz
author_rank: Regular Contributor
timestamp: November 15, 2017, 01:46:25 pm
content: thanks
What is "With NIST Certificate" - Page 1
Forum section: electronics / testgear

author: goethert
author_rank: Contributor
timestamp: August 18, 2017, 08:54:22 pm
content: I am looking for a Fluke 87V multimeter. The following two have $100 difference because of "w/ NIST certificate". What is it exactly? Worth to buy it? Thanks.https://www.zoro.com/fluke-digital-multimeter-1000v-50-mohms-10a-fluke-87-ve2/i/G2384733/https://www.zoro.com/fluke-digital-multimeter-1000v-50-mohms-10a-fluke-87-ve2-nist/i/G8201873/

author: metrologist
author_rank: Super Contributor
timestamp: August 18, 2017, 08:59:41 pm
content: It was verified using equipment and standards that are traceable to the National Institute of Standards and Technology standards. It's only worth it if you need instrumentation that is traceable to that standard.

author: LabSpokane
author_rank: Super Contributor
timestamp: August 19, 2017, 12:03:41 am
content: Unless you need equipment traceability for commercial or governmental reasons, don't buy the cert.

author: EEVblog
author_rank: Unknown
timestamp: November 14, 2017, 08:45:17 pm
content: Quote from: LabSpokane on August 19, 2017, 12:03:41 amThis.The "traceable certificate" is something that companies get in order to keep their QA systems happy, and for legitimate reason to do with traceable assurance.Personally it can give you an extra "warm fuzzy" that your meter meets specs, but in theory your meter can drift out of spec the day after it leaves the calibration house. Individuals should pay extra for this.

author: iainwhite
author_rank: Unknown
timestamp: November 14, 2017, 09:17:17 pm
content: Quote from: EEVblog on November 14, 2017, 08:45:17 pmDid you mean "should NOT pay extra" ? It seems that way from the rest of the post.

author: EEVblog
author_rank: Unknown
timestamp: November 14, 2017, 10:17:35 pm
content: Quote from: iainwhite on November 14, 2017, 09:17:17 pmOops, yeah, NOT pay extra.

author: bson
author_rank: Unknown
timestamp: November 15, 2017, 02:53:30 am
content: Any decent calibration lab will use a NIST traceable standard/reference. It's just you have to pay extra for the piece of paper stating as much. They use the same equipment and procedures, to the same standards, regardless of whether you want the certificate.
J-FET 2SK932-24 - Page 1
Forum section: electronics / testgear

author: sdouble
author_rank: Frequent Contributor
timestamp: November 17, 2017, 08:41:13 pm
content: Dear all,The famous j-FET BF862 is now discontinued. It has been a long lasting working horse for many people working in the high impedance world.Very favorable gm/ Cgs ratio and good low frequency are some of the major reason for its success.The very recent On Semi 2sk932 shows similar specs and I decided to test some of its properties this week.the 2SK932 is splitted into 3 Idss ranges. I went for the Higher Idss range : 14.5mA to 24mA at Vds=5VI run my boards at Vds = 2.5V. Therefore, all tests were realized at Vgs=0 and Vds =2.5V leading to lower values of Idss.I bought 2 reels in 2 months and looked at 150 samples.The mean measured Idss was 17.1 mA with a RMS of only 1.2 mA .Such a low dispersion in the Idss distribution is pretty impressive for a j-FET and was worth mentioning I think.I could match tens of pairs of 2sk932 easily.The meaured gm was very close to 50mS for all samples.
A 'Thank you' for the uCurrent Gold - Page 1
Forum section: electronics / testgear

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: November 15, 2017, 02:39:42 am
content: I got my uCurrent Gold yesterday - 6 days door-to-door from Oz to the east coast of the US. Amazing. I'd never heard of it until the same day I ordered it.For years I have suspected that vendors of a certain type of laboratory analytical equipment were conveniently sweeping an important issue under the proverbial rug. It relates to electrode polarization. I became suspicious a few weeks ago and set about on my mission to see if it was present and the impact it was having on generating misleading data. In the past, I have used Keithley picoammeters but I really couldn't justify the cost even for a used one off eBay. I stumbled across the uCurrent Gold (like real gold, it's a well-hidden gem). Just a few hours after receiving it, I had confirmed my suspicions and I know there are going to be some none-to-happy folk when I complete in-depth experiments and publish the findings.Wow, Dave. Thank you for such a great - and very inexpensive - product.John.
DIY GPIB to USB - summary and way forward? - Page 1
Forum section: electronics / testgear

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: November 14, 2017, 07:12:46 pm
content: I recently searched for various implementations of a really cheap GPIB to USB adapter. There are quite a few, but each one seems to be only 50-80% complete. There are also semi-commercial solutions for $70 to $150. I have become addicted to cheap e-bay items, because that seems too expensive for hobby purposes. Also, one can get a used GPIB to RS232 adapter for $50 or less. Here is the list of relatively recent posts I found:Atmel Atmega implementation (Arduino and clones):http://prologix.biz/gpib-usb-controller.html$150, works with EZGPIBhttp://egirland.blogspot.com/2014/03/arduino-uno-as-usb-to-gpib-controller.htmlOne device, works with EZGPIB (with changes?), No-derivative licensehttp://www.rudiswiki.de/wiki/GPIBtoUSB_Nano3Multiple devices (not tested)http://www.kingswood-consulting.co.uk/gpib/https://github.com/mathiashelsen/agipibihttps://github.com/pepaslabs/atmega-gpibcustom board, recent work in progressMicrochip PIC implementation:http://www.galvant.ca/#!/store/gpibusbPIC18F4520 , $70http://www.dalton.ax/gpib/PIC18F2550. Works with EZGPIB with mod. Boards available?http://www.natureandtech.com/?cat=224pic18F24k50, work in progressI don't have much experience with microprocessor programming. I imagine an ideal solution would be:1. Using a general purpose board that one can buy on ebay for a few dollars. There have been a few implementations that connect GPIB lines directly to the controller, without any pull-up or current-limiting resistors. I am not sure how reliable that is long term. But for really low cost it would be best to avoid custom boards (at least until some Chinese manufacturer starts making and populating them). Then all one needs to do is just solder wires to GPIB and USB connectors.2. Simple software path, with an .ino file that can be uploaded using Arduino IDE. PIC processors usually require more steps.3. Compatibility with EZGPIB4. Ideally ability to talk to 2-3 instruments using short cables, high speed is not crucial.It seems we are fairly close to a complete solution. With a bit of a group effort or rallying the original authors it should be possible to get there. For me, the first question is which one of these implementations is most promising as a starting point?
Infiniium DSO80000B Series Oscilloscopes vs DSO8000 Series Oscilloscopes - Page 1
Forum section: electronics / testgear

author: Zucca
author_rank: Unknown
timestamp: November 14, 2017, 05:43:05 pm
content: Hi, after looking at the datasheet:http://www.testequipmenthq.com/datasheets/Agilent-DSO80204B-Datasheet.pdfit seems a very interesting digital scope family.I would like to know what you think about it, also in comparison with the Infiniium 8000 Series Oscilloscopes it seems to have much more sample/seconds...So a little "B" will change so much?Have you guys have touched one of those animals? What do you think about them?

author: Someone
author_rank: Super Contributor
timestamp: November 14, 2017, 09:15:43 pm
content: Quote from: zucca on November 14, 2017, 05:43:05 pmI think you jump from 8000, to 80000 and miss one order of magnitudeThe 80000A and 80000B not so different to each other, but a different platform to the 8000 (even though the same UI/case)

author: Zucca
author_rank: Unknown
timestamp: November 14, 2017, 11:16:10 pm
content: yeah it's more than a "B", it's 10x and then "B".
Protek 6506 High Voltage problem - Page 1
Forum section: electronics / testgear

author: ulyanoff
author_rank: Contributor
timestamp: November 13, 2017, 01:51:53 pm
content: Hello friends ! I have problem with my oscilloscopes Protek 6506.In this moment don`t work transformer T1001, in manual I can see transformer SZ191F from TAMURA.May be someone knows where to buy it or the winding data of the transformer??
Anyone know anything about this RF signal generator? - Page 1
Forum section: electronics / testgear

author: GreyWoolfe
author_rank: Unknown
timestamp: November 10, 2017, 10:22:00 pm
content: This is an Electronics Measurements Corporation, New York, NY, RF signal generator. My ham radio club received a rather large donation of equipment and this was in one of the boxes. It does power on, the single tube glows (didn't check tube type) but it only puts out 60 Hz regardless of the setting.Has anyone seen or owned one of these? Maybe even have a schematic for it? It defeats my Google Fu to find out anything on it.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 11, 2017, 04:21:56 am
content: Sanity check first: replace the capacitors.Likely the tube is a 12AU7 or 6SN7, or heck, even simpler than that, 6C4 or 6C5 or the like. It can be checked on a tube tester (which, heh, your club probably has one, or does now).The oscillator coils themselves should be fine, that's not an aging problem. Do check for shorted caps, in case there are tin, zinc or silver metal whiskers growing out of plating or whatever.Tim

author: edpalmer42
author_rank: Super Contributor
timestamp: November 11, 2017, 04:45:26 am
content: http://antiqueradios.com/forums/viewtopic.php?t=90853- schematic- troubleshooting

author: GreyWoolfe
author_rank: Unknown
timestamp: November 12, 2017, 12:39:51 am
content: Ed, thanks. I found a link to the antique radio website and the link had a bunch of stuff but not the signal generator. It seems it was a fairly cheap kit but it might be worth trying to bring it back to life. There is only a couple of caps in it so it shouldn't take much money to fix up.

author: edpalmer42
author_rank: Super Contributor
timestamp: November 12, 2017, 01:08:19 am
content: I noficed that yours has been modified. The BNC jack definitely isn't original. Watch out for more internal mods.Ed

author: GreyWoolfe
author_rank: Unknown
timestamp: November 12, 2017, 01:39:27 am
content: So did I. I am going to have to draw a better schematic than what I have been able to pull off the computer. There is only the 1 40 uF capacitor. I actually need 2 additional of the same value so I will have to hunt them down.

author: georgd
author_rank: Regular Contributor
timestamp: November 12, 2017, 02:40:00 pm
content: At 38th minute o fthis video I saw some tools unknow for me:https://image.prntscr.com/image/eb2HEyeCT7_CvZZ50VQSLA.pngWhat are these orange cakes?Georg

author: GreyWoolfe
author_rank: Unknown
timestamp: November 12, 2017, 09:58:07 pm
content: Quote from: georgd on November 12, 2017, 02:40:00 pmBench cookieshttps://www.amazon.com/Bench-Dog-10-035-Cookie-Grippers/dp/B0037Z7D0A
TTi 1906 5,5 digit programmable benchmeter repair - Page 1
Forum section: electronics / testgear

author: PA4TIM
author_rank: Super Contributor
timestamp: November 10, 2017, 07:50:58 am
content: A friend gave me 2 of these benchmeters he found in the dumpster. They looked very nice. There is not much to find about this meters so I made a video of the repair of the most dead one. Someone already worked on it because it was missing parts. The total repair was something like 6 hours work because there was a lot off hidden damage from the earlier repair.For future meter owners. They (ab)use a lot of LM324 as comparator. In both meters a lot of them were dead. The relais are latching and they use a LM324 and series electrolitic cap to pulse the relais. Replace those caps if you have strange switching problems with the relais.I hope this video helps others to repair a meterhttps://youtu.be/suUTTDEpG5k
Fluke transformer needed for 6060 series RF signal generator  - Page 1
Forum section: electronics / testgear

author: HotIron
author_rank: Newbie
timestamp: November 10, 2017, 07:25:53 am
content: Hi All,I was trying to repair a broken Fluke 6060A signal generator with no display. It turns out the filter cap for the 38v output from the transformer was shorted which causes the transformer overheat. I isolated the transformer from the rest of the circuit and measured the secondary output voltages. All secondary output voltages are ok except the 38v output. it only outputs 6.4v ac instead of 38v ac. If I let the unit stay on, the transformer will heat up even with no load. I just wonder if anyone here have a transformer available. Any transformer from Fluke 6060A, 6060A/AN, 6060B, 6061A or similar would work. Fluke's part# is 717959 or 774315. Thanks.David
NVRAM IC for Prema 6048 (or 6047) - DS1220AD doesn't work! - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: November 09, 2017, 02:07:23 pm
content: For those of you who have a Prema 6047 or 6048, the original NVRAM that was fitted to my meter was a DS1220Y with a date code from 1987. Clearly in need of replacement.I ordered a DS1220AD-100 and found that it didn't work (Error 8 - checksum failure). I could read the original DS1220Y, and could write the content into the DS1220AD with my Galep-4 programmer, but the meter was having none of it when I installed the DS1220AD.I contacted Prema in Germany and they advised me to use an ST M48Z02-150 as the DS1220AD was known not to work.I installed the M48Z02 into the meter with the rear panel switch in the "Cal" position, which wrote the original factory calibration constants for THIS meter from the EPROM into the NVRAM.When I compared this data with what I'd previously read from the DS1220Y, it was pretty much the same (only ten bytes different), so I stored the data from the DS1220Y into the M48Z02 and put it back in the meter.PS does anyone know the format and location of the date code printed on an M48Z02, as the current ST datasheet is silent on this issue.HtHDaveSo

author: stj
author_rank: Super Contributor
timestamp: November 09, 2017, 02:54:58 pm
content: i would also like to know the date coding,i think one of the big u.k. suppliers is shipping 10year old parts!btw, dont throw the old part away - try to open it to remove the original cell and replace it with a coincell-holder.if you fail - you lose nothing, but if you manage then it will be better than the factory part that has a smaller battery of unknown age.
MSO-2204EA Bandwidth - 300 MHz. - Page 1
Forum section: electronics / testgear

author: rfdes
author_rank: Regular Contributor
timestamp: November 09, 2017, 02:51:29 pm
content: I mentioned in an early post that I had finally purchased a new scope. I've been using a TDS-3054 since the late '90s, so I was definitely overdue to upgrade.At the moment I'm working through all of the functionality and wanted to report that the bandwidth check on my unit was a very solid 300 MHz although it is specified to 200 MHz. I was quite surprised. I used a Fluke 6080 sig gen terminated using an external 50 ohm load at the scopes inputs. I was guessing I would see a margin of maybe something like 220 MHz or so, not a full 300 MHz.Anyway, I didn't know what I've been missing all of these years. On top of that I received the Saelig discount bringing the total cost to $1750. Dirt cheap in my book compared to what I've been used to spending on Tek/Agilent equipment.I certainly hope this unit lasts a long time.Take care to allJim
Takeda riken Manual  schematic for  TR4113 AL - Page 1
Forum section: electronics / testgear

author: domino33
author_rank: Newbie
timestamp: November 10, 2017, 09:26:00 am
content: Bonjour,je possède cet appareil et j'ai égaré sa notice technique (incroyable mais vrai!)le commutateur de gain logarithmique 10/5/2/ dB ne fonctionne plus que sur 10 dB! Sinon la trace disparaitCela ne me semble pas un mauvais contact car sur 5/2/1/dB c'est pareil!je ne retrouve plus le dossier de cet appareil qui a..20 ans et j'ai déménagé 3 fois depuis.QUI aurait un tel dossier? QUI pourrait me le scanner et me l'envoyerJe paye ce service bien surBonne journéeDominiqueHello,I possess this device and I misled the specification sheet (incredible but true!)The switch of logarithmic earning 10/5/2/ dB works only on 10 dB! Otherwise the track disappearsIt does not seem to me a bad contact because on 5 / 2 / 1 / dB it is similar!I do not find any more the file of this device which is 20 years old and I moved 3 times since.WHO would have such a file? WHICH could me the scanner and send it to meI pay this service well onGood dayDominic
Black Friday Sales for test equipment ? - Page 1
Forum section: electronics / testgear

author: kwaite
author_rank: Newbie
timestamp: November 05, 2017, 02:41:18 pm
content: Does anyone know of or have ideas on whom will be having Black Friday sales, especially on oscilloscopes? Over the next week I will look around and see if I can find any adverisements and post them here.Thanks!

author: Joel_l
author_rank: Frequent Contributor
timestamp: November 05, 2017, 03:00:29 pm
content: These guys have in the past, as well as some sales throughout the year.https://www.circuitspecialists.com

author: LaurentR
author_rank: Frequent Contributor
timestamp: November 05, 2017, 03:19:20 pm
content: Along the same lines, there is the Chinese "11.11" sale, which is next week.You may be able to find good deals on Aliexpress for instance (many of the deals are already advertised).For instance, I am eyeing one of the new Andonstar microscopes with some good pricing.

author: wraper
author_rank: Unknown
timestamp: November 05, 2017, 03:27:29 pm
content: Quote from: LaurentR on November 05, 2017, 03:19:20 pmYou need to be aware that many of discounts will be fake. Often base price is increased so it appears like if there is a big discount.

author: kwaite
author_rank: Newbie
timestamp: November 10, 2017, 11:01:27 am
content: Good info - thanks all for replying I am calling Tequipment tomorrowhttps://www.tequipment.net/as I don't see any but normal sales. Well in my case right now I need a sale on the salesThanks all
HP 3478A or Agilent 34401A? - Page 1
Forum section: electronics / testgear

author: beuford
author_rank: Contributor
timestamp: November 08, 2017, 08:02:43 am
content: I've stumbled across two interesting DMM deals (I'm an equipment/tool junkie...), but I can't afford both.One is an HP 3478A at $150, the other is an Agilent 34401A at $350. Both are local.Which provides the better value, and what should I check before purchase?Any advise/suggestions would be appreciated.Beuford

author: beanflying
author_rank: Super Contributor
timestamp: November 08, 2017, 08:34:13 am
content: Not long ago done just this exercise and the 34401 just out of Cal Agilent wonIn Australia we don't have to many of them come up for sale and hence the local price tends to be higher. So if you can grab one locally and in particular have a look before parting with the $$ even better. So rather than perhaps decide to upgrade to something newer in the short term I decided to do it once (famous last words) Resale value on Agilent over HP should remain better too.Do it you know you want to

author: woody
author_rank: Frequent Contributor
timestamp: November 08, 2017, 08:51:57 am
content: I got the Agilent 34401A a couple of weeks ago for US$250 and, apart for the solid DMM features it has, I really like the VFD display. This display is both the strong and the weak point of the DMM, as in an older unit the brightness (of one or more digits) can be a problem.

author: hendorog
author_rank: Super Contributor
timestamp: November 08, 2017, 09:00:38 am
content: I have both. The HP 3478A is still in bits under the bench. I dislike it mainly because it has a really dumb (fragile, easily broken, combined mechanical and electrical) connection from the front panel to the main board, be very wary of that if you ever pull one apart.Neither sounds really cheap. You could easily get an 3478A on eBay for much less, but would have to try a little harder for the 34401A.

author: capt bullshot
author_rank: Super Contributor
timestamp: November 08, 2017, 09:06:39 am
content: My choice would be the34401Aboth (one cannot have to many multimeters)It's more recent and I like the VFD way more than the LCD
Question on Fluke 45 AC voltage measurements - Page 1
Forum section: electronics / testgear

author: beuford
author_rank: Contributor
timestamp: November 06, 2017, 06:32:33 pm
content: I recently purchased a used Fluke 45. It is in excellent physical shape and seems to work fine except for low-level AC voltage measurement. However, I am aware that AC voltage measurement is usually specified with far less precision by meter vendors, so maybe this is normal? I'm hoping someone can confirm or advise.When in the auto AC range with shorted leads (different lead sets tried with the same results), the AC voltage reads about .240mV. Manually increasing the voltage range increases the reading, but leaves the digits very nearly the same; see photos below as the meter cycles from the 300mV to the 750V range.Is this expected for AC measurements with the Fluke 45 (or other meters), or is it in need of repair/calibration? Any advise would be greatly appreciated.Thanks in advance,Beuford300mV range:3V range:30V range:300V range:750V range:

author: alm
author_rank: Super Contributor
timestamp: November 06, 2017, 08:10:50 pm
content: There used to be a Keithley document describing this in detail, but it seems to have disappeared when Tektronix ate Keithley. The best reference I found wasthe first entry in this Fluke FAQ, but it is light on details. Basically, the true RMS converter has an offset of about 240 counts. With shorted inputs, it will read 240 counts. If you read the manual, it will likely specify ACV measurements only down to something like 3% of full scale. So for the 100.000 mV scale, the minimum value it should accurately measure is 3 mV. For an input signal of 3 mV, the reading would be \$\sqrt{(3.000 mV)^2 + (0.240 mV)^2} = 3.010 mV\$, which I imagine is within the accuracy specifications.

author: Deckert
author_rank: Regular Contributor
timestamp: November 06, 2017, 11:04:05 pm
content: Hi,Mine basically reads about half of yours, but in the last pic I see you can null out the input reading by pressing REL.Auto:300mV scale:3V scale:REL:--deckert

author: Performa01
author_rank: Super Contributor
timestamp: November 07, 2017, 07:58:19 am
content: True RMS converter exhibits some offset whichmust notbe nulled by means of the REL function.This is absolutely normal for any true RMS meter, except for some of the latest models, which just sample the input at high speed and calculate the RMS voltage in software, like a DSO would do.As has already been stated, you can measure AC voltages down to a certain value that is guaranteed to be less than a certain percentage of the range, below that threshold the reading won't change anymore.

author: beuford
author_rank: Contributor
timestamp: November 08, 2017, 07:54:29 am
content: Thank you for your responses; it makes sense now. Seems like a decent little bench meter for only $150.Beuford
Oscilloscope GW GOS-643 - Page 1
Forum section: electronics / testgear

author: mabcs
author_rank: Newbie
timestamp: April 07, 2014, 12:39:41 pm
content: hello anyone know give me an opinion on this scope? I can not find neither manual nor technical, but it exists! GW GOS-643 40 mhz

author: pelleman
author_rank: Newbie
timestamp: November 13, 2015, 01:24:44 pm
content: Lets dig up this long dead thread.Yes, I can testify it exists. Mine is a bit dim but otherwise a bobby dazzler. Built like a brick dunny.I have scanned the manual. Enjoy this PDF!http://marsba.se/?p=129GOOD WILL INSTRUMENT CO., LTD40MHz Dual Trace OscilloscopeModel: GOS-642 / GOS-643

author: retired tech
author_rank: Newbie
timestamp: November 07, 2017, 10:40:52 pm
content: Hi,Pelleman, I have a GOS-643 that has a problem in the vertical section(off screen).If I remove the delay line and feed a variable voltage to it,I can get a good trace(H ok).Do you still have a schematic and trace diagrams for this machine.I set aside for a couple of years,as I have another scope,so wasn't in a hurry to repair it.I tried marsa.se but the site has disappeared.Any help would be appreciated.

author: ebastler
author_rank: Super Contributor
timestamp: November 08, 2017, 06:01:37 am
content: Pelleman has only one post on this forum, and has last been active here in November 2015 according to his profile. So he is unlikely to see this enquiry, I'm afraid. But maybe someone else has that manual?
Hantek button - Page 1
Forum section: electronics / testgear

author: SquaL
author_rank: Newbie
timestamp: November 05, 2017, 03:03:02 am
content: Hi, can someone please tell me if the "Single Seq" button for DSO5102P lights up when pressed? I have searched Google images, videos and other sources and cannot find answer. Thanks.

author: SquaL
author_rank: Newbie
timestamp: November 07, 2017, 03:49:06 am
content: Heard from tech support. This button should light up, but when i opened device...

author: GreyWoolfe
author_rank: Unknown
timestamp: November 07, 2017, 05:38:24 pm
content: Are they the new style stealth LEDs designed to look like switch contacts?

author: MasterT
author_rank: Frequent Contributor
timestamp: November 07, 2017, 06:13:37 pm
content: I see 5 button's with led's, one has two - green and red probably.

author: SquaL
author_rank: Newbie
timestamp: November 08, 2017, 04:07:53 am
content: Received clarification form tech support. Apparently my scope is old (2016), and design for board has since been changed. K17 is where there should be an LED for Single Seq. Maybe I can do a mod...
uCurrent - minimum input to meet accuracy spec? - Page 1
Forum section: electronics / testgear

author: alexwhittemore
author_rank: Frequent Contributor
timestamp: November 06, 2017, 07:50:26 pm
content: Since the uCurrent uses op amps to amplify the shunt resistors, there's some minimum input on each range, positive or negative, closer-to-zero-than-which the offset voltage and input offset current will kill all hope of accuracy. For example - I've got a microcontroller project that I'm trying to measure which uses 200mA in active mode, but 30uA in sleep. The 1mV/mA range is fine at 200mA, but the 1mV/uA range isn't. Inversely, at 30uA, the 1mV/uA range is the right choice, but the 1mV/mA range's 10mOhm resistor is only developing .3uV across it - way lower than the op amp's max offset of 2uV. Any rule of thumb on what's a reasonable minimum input for an op amp like this to be in the generally accurate regime? 10x offset voltage? That'd be 2mA on the highest current range. Or if you take the nominal .1uV offset, and the same 10x margin, more like .1mA on that range, below which all hope for accuracy is gone. Do I have that about right?

author: Damianos
author_rank: Frequent Contributor
timestamp: November 06, 2017, 09:10:58 pm
content: If the problem is the offset then it may be "adjusted" by the null function of the voltmeter, at least for some time.I think that a bigger problem is the noise and any interference...