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Thread: SkyRC — IFA 2014 — MC3000 charger-analyzer

  1. #4771

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Quote Originally Posted by canonite View Post
    i like my MC3000 ... but it seems to have a loud whirring sound sometimes which last 1-2 secs, when i switch it on .. during charging , if the fan comes on... it does not have that loud whirring sound at all..

    wonder if anyone else has the same ?
    Yep, i have same here.
    Its a common thing on old pcs, fans are loud until system/fan bearings warms up.

    Fan needs to be oiled/lubricated to stop doing that.
    I would guess this is a common issue with the charger, and most other chinese charger with fans like the opus, litokala etc.
    They just cant find it in their hearts to use good quality fans , even in a charger that costs almost 100$...
    Last edited by DeJaVu; 07-01-2017 at 01:31 AM.

  2. #4772
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    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Quote Originally Posted by DeJaVu View Post
    Yep, i have same here.
    Its a common thing on old pcs, fans are loud until system/fan bearings warms up.

    Fan needs to be oiled/lubricated to stop doing that.
    I would guess this is a common issue with the charger, and most other chinese charger with fans like the opus, litokala etc.
    They just cant find it in their hearts to use good quality fans , even in a charger that costs almost 100$...
    hope its nothing more then that.. i think i should be able to find a replacement fan if needed... was thinking of attaching those usb fans to the USB output for 'additional' cooling ..
    ::: space for rent :::

  3. #4773

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Quote Originally Posted by canonite View Post
    hope its nothing more then that.. i think i should be able to find a replacement fan if needed... was thinking of attaching those usb fans to the USB output for 'additional' cooling ..
    The fan inside the charger is not 12v like most fans ive come about, but its rated at 15v. So have that in mind when looking for replacement.

  4. #4774

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Quote Originally Posted by kreisl View Post
    Today i followed Alt2 to install 3.2.9 and i did some mc3k logging (click to enlarge!):



    Then i grabbed 3.3.0(beta) and followed Alt1 to install it.
    Sharing time. Maybe nothing new to the people who followed the Raspberry Pi adventures from the very beginning, but afaik nobody posted so far this very setup in picture form, we only talked about it ("headless raspi", "DEX on raspi", "raspi powered by mc3k") and i would believe that not everybody could picture the setup properly in the mind. I didn't share a pic earlier because i wanted to wait for my aluminum case to arrive. Finally we're there!

    If someone wants to log mc3k without a laptop, full-size PC station, or a PC monitor, OR if someone wants to log mc3k for 24/7 (say 99 cycles), this is the recommended way to go. As you can see the raspi is at ~40% GPU-CPU, and the energy consumption is ~2W, which is a fraction of the mc3k's energy consumption. The mc3k's power brick adapter is rated at 60W iirc. Personally i haven't actually tested 99 cycles with this setup for the sake of testing, but i will. Summer is long. So.

    In case you're wondering.. while a (beta) version of DEX for Android does exist , the above setup has nothing to do with it. The above demonstrates how i am using my smartphone to view (and actively control) what's going on on the raspi. There's a smartphone app called VNC Viewer. The app mirrors the raspi desktop on my phone in real-time, and there's no major time lag unless you run a high-res HD video on raspi's VLC Media Player. So, DEX is installed on raspi, and i use my phone's viewer app to remotely access raspi and its DEX. I can do so, even when i am on the train, on the road, etc., the VNC Viewer app is crazy awesome, stable and modern. And easy to use.

    DEX produces *.OSD (or *.CSV) files on the raspi's microSD card. How do you transfer files from the raspi to your (new/old) PC workstation or to your smartphone in the most elegant and efficent way? The answer is the same: By using 'the FTP client of your powerful file manager' on your PC/smartphone/etc. TotalCommander and Directory Opus 11, for example, are powerful file managers (for PC, also for Android phone) with built-in FTP functionality. So you point your file manager to the raspi (typically bookmarked under Favorites or Bookmarks of your file manager) and bam!, you have all the file access to need: you can copy/paste files from the raspi and also to the raspi, back and forth. The reason why this works is: as soon as you enable Interface: SSH on the raspi, the raspi can be addressed as special FTP server, called SFTP over SSH. Note that this FTP'ing works only when your PC or smartphone is in the WiFi network of your raspi and WLAN-router.
    If you're on the road in your car and really wtf need to transfer files between smartphone@car and raspi@home, then upload the file to the cloud or as email attachment and download it on the system where you need it on (Raspbian or Android, either accessed through your smartphone@car); there are also dedicated tools for any kind of file transfer between computers, for example Send Anywhere.

    Everything works beautifully like that.

    Once in a while i would update my raspi thread, whenever there is something new or neat to share. Hope you find my posts worthwhile reading or even inspiring (any mc3k owner interested in buying a raspi now too? i know at least one other person ). The content is very basic, i am a raspi beginner, but scratching at the raspi world is absolutely enough to keep myself hooked. And as a logging machine for mc3k (and UT61E) it found a serious purpose in my hands.
    Last edited by kreisl; 07-02-2017 at 05:58 AM.

  5. #4775

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    YEEEESSSSSS, WOOOOHOOOO
    I was starting to feel left out, but no more. Full fledged member of the brotherhood, baptized by snap.

  6. #4776

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    I am not sure what you're saying but you do sound delighted about something with regard to this thread. Must be something good positive then

    Btw to whom it may concern:
    Since this great flexible method of "quasi-offline" logging (technically "offline" is incorrect word choice because raspi is a standalone computer and has wifi and www capability) of mc3k exists, works and pleases, I won't request true offline logging, i.e. on a SDcard directly inserted in the charger, if sky ever thought about a "MC5000"in a dream future and asked me about ideas for it. With DEX, you can control which data columns and in which format (how many decimals, which time format, etc) and which sessions and slots are to be included in the exported *.CSV-file. One wouldn't have any such controls if a "mc5k" logged directly to card (unless a raspi were integrated in the mc5k casing - crazy idea).
    Logging directly to card or to USB thumb drive made sense to me like 5-10yrs ago. The game has changed since. The new relevant co-players are wifi, internet, cloud, smartphones and raspi, not even Bluetooth imho. And of course also thanks to the dedicated geman team behind DEX, the software is key in the game.

    When people, from this very day on, approach sky suggesting offline logging capability to built-in SDcard, the rep will probably respond with "aha yes sir do you already know about the raspi dex solution to your request?" and then ignore and move on, how rude lol
    Last edited by kreisl; 07-02-2017 at 12:54 PM.

  7. #4777

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Quote Originally Posted by kreisl View Post
    I am not sure what you're saying but you do sound delighted about something with regard to this thread. Must be something good positive then
    Yes, im ecstatic. For joining the brotherhood of snapped spring posts.
    Not a half hour had passed after me badmouthing skyrc for using cheap fans, and the skyrc gods punished me with a snap sound .
    1 post snapped while charging single 18650(not that oftenly used slot), 2 more were about to give out and only one was intact.

    At least i had a good excuse to open up the charger and tidy it up a bit.
    1.Removed all posts, replaced with zip tie
    2.bent the lower portion of positive contacts so now all flattops can be charged without lifting
    3.Added long overdue "twin turbine" 40mm fans at the back connected to the chargers usb port , got about 7 degrees lower system temp.Considering that the back fans are running at 5V and are inaudible its a good gain.
    Bit questionable mod though, even though you get lowered system temp, when operating it at full power like discharging 4 batteries battery temp rises because the fans are cooling the heatsink and blowing the hot air toward the batteries. Still havent tested how it would behave on charging with high current, but i think it wont bother the batteries much, and those rare times the fan starts during charging should be kept at minimum or posibly eliminated alltogether. Making a side grill so the air escapes from the sides along the airflow(fins are horizontal so air doesnt escape from the top vent but goes along the sides) of the heatsink could help resolve the battery heating issue when discharging.
    Not sure if i will try that, the little bugger got me tired, removing that chewing gum from the connectors was a real (challenge). Took me more than half an hour, and was actually the hardest part of the whole process if you ask me.
    4.And at the end removed that cheap paste and replaced with good one, battery temp sensors now seem much more precise to me. Gained a few degrees of system temp upon doing this grrrrrr. I know, i know, the degrees were there but i just couldnt see them, and now i have the gift .

    All in all, i found the good in the bad.
    Last edited by archimedes; 07-02-2017 at 07:39 PM. Reason: language, please

  8. #4778

    Smile Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Quote Originally Posted by kreisl View Post
    How do you transfer files from the raspi to your (new/old) PC workstation or to your smartphone in the most elegant and efficent way?.
    Congrats on the whole setup
    Happy to see a convert to Pi

    About transfer, samba is supported also,
    and sshfs allows to mount the raspi memory card as a remote drive/folder from another linux machine.

  9. #4779

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Quote Originally Posted by Ravel View Post
    Congrats on the whole setup
    Happy to see a convert to Pi
    @Ravel , thanks for your cheers!!
    Without you guys' help and the recipe it would have taken me much longer to install DEX on Pi. Using the install script made it so much easier! A RS232 serial board in form of a "Pi Hat" is on my way, that should complete my Pi-related purchases. Then i'll be able to log my multimeter on Pi too, not only the mc3k.
    So you like samba and sshfs for remote access? If i understood correctly, SSHFS is a thing between two Linux machines; i couldn't use it on my Win-machine or on my Android phone. Samba seems popular, versatile, powerful, and has functionality like the control of printers which SFTP doesn't have. But for file transfer/file management, it seems that i would use my Win file manager here too, the raspi drive/folder would become available as a new shared network computer entry in my Win file manager. Samba must have its strong advantages over SFTP but the latter still seems to me the most direct primitive easiest way to connect and transfer, since modern file managers already have an integrated FTP-module and one does not need to create/modify/manipulate linux files on the raspi.

  10. #4780

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Quote Originally Posted by CuriousOne View Post
    Hello. Which charger currently has most reliable battery internal resistance measurement, for both Lithium and Nickel cells? (Except hobby chargers and MC3000 please).
    Since the author doesn't want mc3k discussion in his thread..

    I saw a similar question on the geman forum. The OP couldn't produce consistent Batt IR measurements with the mc3k and questioned the acquisition. I commented that, unfortunately as so much in serious life, if one wants to produce serious or ambitious measurements (like HKJ) which are suitable for publication or future reference, the mc3k device takes a minimum of personal efforts to produce such measurement results. The key reason for this being the various contributions of contact resistances per slot. Let's count, (+)TERMINAL-(+)BATTERY, (-)TERMINAL-(-)BATTERY, SLIDER-RAIL; that's 3 contributions. If you modded (it is possible but don't ask me how lol) the mc3k to having FourTerminalSensing (actually, it is ThreeTerminalSensing in practice) slots, you would eliminate the SLIDER-RAIL contribution only, and the total contact resistance would still depend on the contact pressure. Contact pressure is highest and optimal in a fixed bay charger like the MH-C9000; the AAA and AA batteries are really firmly seated between the contacts.

    What kind of personal efforts? Well, amongst others, a fully serviced, maintained, re-calibrated unit, plus the manual minimization of the total contact resistance. Clearly, the ambitious tester tries to find the minimum of the total contact resistance (in a particular slot), before he proceeds with the test (Batt IR test, capacity test, whateva test) and publishes the test results.

    Getting consistent and reliable Batt IR measurements with the mc3k is, due to the personal efforts, a bit challenging at first. Same with sharpening knives, tuning an old violine, or frying perfect eggs sunny side up! We are talking here +1 milliohms deviation, so any disturbing factors must be taken into account, eliminated or minimized!! Unless the battery is soldered to the PCB, you cannot eliminate contact resistance. So you can only minimize it by maximizing the contact pressure, e.g. as seen in the MH-C9000 or NC2500 fixed battery slots.

    Nuff with the blablah. My unit was serviced and re-calibrated over a year ago. So, for my test videos, i only had to look out for the minimal total contact resistance and then try to reproduce the minimum before turning on the camera! The "trying to reproduce" took me an average of ~5min. So the time difference between each of the 4 video clips is ~5min. I didn't feel like video recording the 20mins of efforts (= 4*5min), i am showing the end result only. As any reviewer/tester does. As any pianist does. No pianist video records how he progresses studying a new piano piece until he finally gets to public-worthy performance quality!

    The point of the footage is NOT to teach you how (what i did in the 5mins) to get to each of the four video results. The point of the footage is to prove that consistent Batt IR measurement is possible on the mc3k. Note: The test results are also reliable, as long as you repeat them under the same battery conditions: the battery should be well-conditioned (i.e. not a sleeping battery), fully charged, cooled off, and clean. lol.

    Through rotation of the 4-bay configuration each battery was tested in every slot.


    WHITE: 94, 94, 94
    BLUE: 86, 86, 86
    VIOLET: 86, 86, 86
    YELLOW: 81, 81, 81


    YELLOW: 81, 81, 81
    WHITE: 95, 95, 95
    BLUE: 86, 86, 86
    VIOLET: 88, 88, 88


    VIOLET: 86, 86, 87
    YELLOW: 81, 81, 81
    WHITE: 93, 93, 94
    BLUE: 84, 84, 85


    BLUE: 87, 87, 87
    VIOLET: 87, 87, 87
    YELLOW: 81, 81, 82
    WHITE: 95, 95, 95

    The batteries are from my set of Eneloop Panasonic Tropical (manuf. 2014), have been re-conditioned just now (BREAK_IN, followed by 6 cycles at -0.5/1.0A with MH-C9000, avg. mh-c9000 capacity reading ~1890mAh) and have been discharged to 0.9V without D.REDUCE prior to the above Batt IR measurement tests. Afaik Batt IR measurements should not be taken with discharged batteries, because this would produce unreliable or unstable results, but .. the heck i thought and did it anyway haha, with no detrimental effect in this clip series, as we could see.

    To cut the whole post short:

    If i gave my mc3k, this very unit!, and my Eneloops, this very set of 4 well-conditioned samples!, to my RC hobby savvy neighbor and asked him to shoot a series of videos showing 4-bay configuration rotation and measurement of Batt IR (3 readings per battery per slot) — basically doing exactly the same what i did in ~22mins of efforts! — he would have shot everything in 1 single video of 1min length and gotten completely different measurements showing in his video footage: whose fault for the discrepancy between mine and his footage would it be then? Is it the device's fault? Or is the mc3k user to blame? I will let the buyer/shopper decide upon this question.

    The gist is, it really does take some efforts (time, energy, efforts, experience, practice, patience, frustration, knowledge, understanding, etc) to get things as beautifully right as seen in HKJ's review or the above set of 4 video clips ... regarding the ambitious measurement of battery internal resistance with the mc3k charger. ( Btw before i start very serious capacity tests, i use the Batt IR function too to learn the total contact resistance minimum per slot. Extra contact resistance, for example caused by my flaking dandruff, would ruin the beauty of the capacity test results. )
    Last edited by kreisl; Yesterday at 05:51 AM.
    ~ bitterness about poor quality remains long after sweetness of low price is forgotten ~

  11. #4781

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    So far, hobby chargers with balance connector and good quality cradle are most affordable tool for IR resistance testing.

  12. #4782

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Quote Originally Posted by kreisl View Post
    @Ravel , thanks for your cheers!!
    So you like samba and sshfs for remote access? If i understood correctly, SSHFS is a thing between two Linux machines; i couldn't use it on my Win-machine or on my Android phone. Samba seems popular, versatile, powerful, .
    Was thinking just file access, not remote access as such.
    Never used samba, I know nothing about winblows (it was for completness of option)
    Quite keen on sshfs, yes it is more of an oddity linux to linux, but great.

    Also if interested there is an android raspi manager app called raspmanager

    Regards

  13. #4783
    Flashaholic _UPz's Avatar
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    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Hi,

    Today I am trying to replace an old MC3000 case (wiv broken spring poles and some screw column missing two) and I am struggling to take the display off. Removed all screws but the display block seems to be glued to the case and pry/level it is scary...

    Any of you who replaced the case or dissasembled the display can help with any tip?

    Thanks a million!

  14. #4784

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Quote Originally Posted by _UPz View Post
    Any of you who replaced the case or dissasembled the display can help with any tip?
    Here is my tip: the display assembly consists of LCD screen soldered(?) to its PCB. And between LCD and mc3k case there is a thick transparent plastic window. We have four layers at the screw posts for the display assembly: mc3k case + window + LCD + PCB. Since this sandwhich is held together with 4 small screws, their white glue is imho not needed.

    Maybe you can tell us how you managed to ..

  15. #4785
    Flashaholic _UPz's Avatar
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    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Hi kreisl,

    Thanks for your "tip".
    I've managed to take out the display, not with a lot of scary moments. As you say, there's white glue. Too much imho. And also, not needed at all because all parts are nicely enginereed and the fitment is perfect with no glue.



    Dissasembling my old unit was easy, till I got to the display... after some meditation I decided to throw the dice and try to pry it out. I started prying with small flat screwdriver from the corners. I bended the screwdriver and the "sandwich" display was still intact . Grabbed a bigger flat screwdriver and my wife's hair dryer. After heating a bit the display corners from the front side of the device, I started to feel how the things started to get "screamy" when prying, cracky scary noises. But shortly the screen (LCD and it's PCB) came out.



    There was still the display "window" attached to the case. And it had TONS of white glue under. More hair dryer, a bit of pry... but the material of the "window" is bit fragile and I broke a small bit (fortunatelly not visible from the front face) of it while prying... then I switched the screwdriver for a guitar pick and slowly I started introducind it from the front joint of the window-case. Spend a bit of time slowly separating the glued parts and finally the d*mn window thingy came off.



    My adventures with mc3k replacement case didn't end there... shortly after removing all the bits (including the logo plate) from the old case, I noticed the new case had thicker screw columns. YES.
    I measured my PCB hole diametter (~5.2mm) and the columns in the replacement case are ~6.4mm. Whoa... test fitment confirmed: My "motherboard" PCB (v1.4, 07-2015 FYI) didn't fit in the new case columns.



    There was no other option than sand the columns or bigger the PCB holes. Since I was replacing the case because it had 4 broken spring poles and 3 screw column missing... for me it made no sense to "weaken" the new purchased ( and pretty expensive if you ask me ) case. So I took a round diamond file and start sanding out the holes to make them bigger. I took extreme caution to not touch any of the traces around the holes. It was specially tricky with the center-left hole, which I sanded a bit on the PCB and had to sand a bit the case column to reduce its diametter to make it fit, because there are PCB traces surounding the hole very closely.



    Once I got all holes enlarged I test-fitted the PCB: nice perfect fit. I followed this video tutorial (tx larry) for assembly, which can be tricky specially with the backplate-slider-spring-cable-thermalsensor fitment combination .

    Fortunatelly my unit is now repaired, working and looking good, but, just in case any of you need to replace the case (because poor plastic choice on first batch) just be aware that it's not a fast & easy task.
    Also, the replacement case product page didn't say nothing, but it's only the front half. It doesn't include the back case, nor the display window, nor the screws, nor the slot thermal plates, nor even the logo! I understand that it's a replacement part intended for waranty issues, but people paying "full price" like me will feel like ripped off.

    Thanks again for the help!
    Last edited by _UPz; 07-12-2017 at 05:52 AM.

  16. #4786
    Flashaholic* MidnightDistortions's Avatar
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    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    I'm so excited, i got my MC3000. I'm playing around with an older AAA NiMH battery. I couldn't get the temp cut off to work though, i'm not sure why that is unless it's because the battery is at an angle? It was the only way i could get the battery to go in there. Either way, this is pretty cool a lot more information and play.
    LED Lights: ThruNite TN4A, Coast HP7, LEDLenser T7, Fenix E25, Fenix LD41, Maglite 2D, Maglite XL50, Maglite 3D (3rd Gen), AA MiniMaglite Pro+
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  17. #4787

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    yes could be. the AAA might not be touching the temp sensor plate.
    btw i have enough thermal paste on my thermal sensors, so my slot sensors work pretty well. just saying.
    Congrats to the acquisition, welcome to the owner's club
    Which firmware version is on your unit?

    Quote Originally Posted by _UPz View Post
    Thanks for your "tip".

  18. #4788
    Flashaholic* MidnightDistortions's Avatar
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    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Yeah. Thanks.. it's a great unit. I'm not sure if i can view the firmware while i have a battery cycling in there. I think it was 1.4 something i don't recall.
    LED Lights: ThruNite TN4A, Coast HP7, LEDLenser T7, Fenix E25, Fenix LD41, Maglite 2D, Maglite XL50, Maglite 3D (3rd Gen), AA MiniMaglite Pro+
    Chargers: Maha C9000, La Crosse BC1000, Panasonic BQ-CC17, Eneloop user.

  19. #4789
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    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    was charging nl1834 cells.. and notice slot 4's battery post being pushed into an awkward position.. spring and slider is fine.. but seems like the post was bent backwards...
    Last edited by canonite; 07-15-2017 at 09:43 PM.
    ::: space for rent :::

  20. #4790
    Flashaholic tjh's Avatar
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    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Is there a new FW version in the works?
    I mean there's nothing wrong with 1.13 as far as I'm concerned (well the beeping error is annoying) but you know, good to see it get an update once a year or so I guess!

  21. #4791

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    i have the 1.14beita and the finalization is on their todo list but these days/weeks they are not working on it afaik. you can see the changes for 1.14 already in de list: only few changes like minor bug fixes, official(!) support for LTO and RAM, and filling up the <DOWN+SNB> in TOV with 4 additional "memories" as not opposed by you guys.

    btw while "memory" is not a technically incorrect term, see old handheld calculators and their <M+> and <MR> keys, i suggested that they use the word "shortcut" instead. when they update the pdf manual, let's look for the old/new words.

    fed is the goat!!

  22. #4792

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    How reliable should we expect the Battery IR measurement achieved by < Up + Down > to be? Compared say with supposedly dedicated battery IR measurement meters?
    EagTac M25C2 Turbo_VN_XPG2-PDTc version; SureFire UB3T Invictus; Nitecore SRT7; TrustFire X6; LumaPower MVP (3xCree) , Sunwayman V11R; 4Sevens Quark AA Tactical; Nitecore DI (R2, GDP, Q5); LiteFlux LF2XT-R2;

  23. #4793

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Quote Originally Posted by 7histology View Post
    How reliable should we expect the Battery IR measurement achieved by < Up + Down > to be? Compared say with supposedly dedicated battery IR measurement meters?
    You must have read my post #4780, haven't you?

    Have you experienced the operation (ease of use?) of dedicated Batt IR measurement meters (dbirmm)? Meaning what?
    Meaning .. if i handed out your meter to a family of six (father, mother, son, daughter, grandpa, grandma) and told them that each person were to give it only 1 shot, after which he/she must quote me the reading, what do you think would the sequence of six numbers look like? And also, i wouldn't give them any kind of information or details on how to operate the meter other than pressing the button

    Point is, i (and HKJ, and and and) can produce reliable batt ir measurements with the mc3k <Up+Down> method, as proven by my above series of footage, but not everybody else can produce reliable batt ir measurements with the mc3k. The minimization or elimination of all contact resistances comes always first, no matter which sensing is implemented (Two-Terminal Sensing, Three-Terminal Sensing, Four-Terminal Sensing) and no matter which sophisticated code algorithm is used, and it is the only challenge to face when any mc3k user wants to produce reliable batt IR measurements with the mc3k (or a dbirmm).

    Or was your question how a "51mΩ(mc3k)" reading (produced by my efforts) compares to a dbirmm reading produced by my aunt? No offense but i would rely more on my mc3k-measurement


    Yet another related example: Have you ever tried to measure the resistance of a piece of wire with the probes of your digital multimeter? A piece of wire has only a few milliOhms resistance, say 6-8mΩ. But to get this reading on the display of your DMM (typically rounded as "0.01Ω" on an auto-ranging DMM) you will have to spend real sweat and efforts with your hands, probes and the piece of wire. The contribution of contact resistance between probe1+wire and probe2+wire is substantial and can range between 0.10-1.00Ω, i.e. 1 or 2 orders of magnitude higher!, depending on how well/forceful you press the probes against the piece of wire.
    Last edited by kreisl; 07-19-2017 at 06:01 AM.

  24. #4794

    Default Re: SkyRC — IFA 2014 — MC3000 charger-analyzer

    Yes I have/had. Which is why I asked the question and was looking for a short answer. I guess a short answer is/was: very reliable if you work at it a bit and certainly as good as dedicated meters.

    Quote Originally Posted by kreisl View Post
    You must have read my post #4780, haven't you?
    EagTac M25C2 Turbo_VN_XPG2-PDTc version; SureFire UB3T Invictus; Nitecore SRT7; TrustFire X6; LumaPower MVP (3xCree) , Sunwayman V11R; 4Sevens Quark AA Tactical; Nitecore DI (R2, GDP, Q5); LiteFlux LF2XT-R2;

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