Looking at picking up the UNI-T 81b (any thoughts?)

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • The Performer
    Senior Member
    • May 2013
    • 60
    • United states

    #1

    Looking at picking up the UNI-T 81b (any thoughts?)

    As the title says, Im in need of a new portable scope. Previous one was the dso nano v2 which got fried.

    I've used the TPI440 and it seems to be a decent meter as well, but much more expensive.

    As of right now my scope usage is very primative, I'm an autotech at best buy and the most extensive use for me is testing wiring to find can networks, and viewing sine waves to set clip levels of amplifiers. That's pretty much what I use a scope for on a day to day, however Im also hoping to get into college to study electronics engineering if I can get my grades up, maybe it will be handy to have a scope meter for that as well.

    Reason Im looking at the 81B is it's a mix of scope and DMM which would be right up my alley of usefulness. I currently have my main meter a fluke 117.

    So that being said, has anyone used one? Likes, dislikes? Better options?

    Thanks in advance!
  • retiredcaps
    Badcaps Legend
    • Apr 2010
    • 9271

    #2
    Re: Looking at picking up the UNI-T 81b (any thoughts?)

    Martin did a review.

    https://www.youtube.com/watch?v=9SPcgNGTiOA
    --- begin sig file ---

    If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

    We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

    Please do not post inline and offsite as they slow down the loading of pages.

    --- end sig file ---

    Comment

    • The Performer
      Senior Member
      • May 2013
      • 60
      • United states

      #3
      Re: Looking at picking up the UNI-T 81b (any thoughts?)

      Originally posted by retiredcaps
      Yes, that video was a great review. Still just curious if anyone had anything to add.

      Comment

      Related Topics

      Collapse

      • ngml
        Repair of an LG split AC system indoor unit PCB
        by ngml
        I am trying to repair an LG split AC indoor unit, which does not start and gives a CH05 error code.
        This indicates an error in the communication between the outdoor and the indoor unit.
        The outdoor unit is fine, so the problem is the indoor PCB.
        The indoor unit is an LG PC09SQ NSJ (3SNM09JA2FA), and the PCB has the following type number: EAX35907219-1.2 (see photo1)
        I changed optocouplers ICO1X & ICO2X and the NPN transistor S9013 which drives optocoupler ICO2X (see photo2), but this did not remedy the fault.

        Does anybody have the schematics of this board,...
        02-01-2025, 12:55 PM
      • CoinCoin88
        Garage door RX unit (Cardin S38C) does not short relay to send opening signal
        by CoinCoin88
        Hello everyone,

        I'm turning to the Badcaps community to help me troubleshoot the radio Rx card from my (old) garage door opener. While I could just ditch that card and replace the whole system, I first would like to understand "why" it suddenly stopped working, because that's just how I am wired...!

        Some basics: the receiver works on a 30.875 Mhz frequency. Yes, I'm aware this is not in use anymore in a looot of places. It does not use any rolling code, it's just a regular dip-switch code that you have to set up on both the receiver and transmitter. The receiver...
        09-15-2025, 03:36 AM
      • DrDos
        Unit runs but no speaker output kenwood KR-6030
        by DrDos
        I have finished my work. The new lights come on except the one for stereo, I reversed the bulbs to no affect, anyway, the unit powers on, relay clicks. I have no DC voltage in speaker outputs, I also do not have any AC in the speaker outputs. There is some faint crackling in the speaker. This unit cranks up loud so I had the volume on very low. Everything seems to be fine but I can't really check the switch until I can get sound out of the outputs. I was going to do caps for the power supplys and the tone board but thought if it was cranking loud at one time maybe just leave it alone until it...
        09-14-2025, 09:57 PM
      • bauto601
        KDM 480W PSU upgrade succes! (opinions?)
        by bauto601
        Back in 2020 i bought a (2nd hand) compact ATX psu to replace my current one. My PC case only fits very short ATX power supplies so i didn't really have the choice of buying a decent 80Plus unit. The current unit is a modded YoungYear unit that i made a thread about a while ago:
        A "nice" YoungYear unit? - Badcaps

        The "new" unit is a KDM-M6480 480W psu, the 480W number is a typical KDM bullshit claim of course, but the 24A rating on the 12V rail seemed reasonable and the "Active PFC" claim gave me a bit of hope that this was going to be decent-ish....
        12-26-2023, 03:05 PM
      • repair-it
        Need advice testing a samsung power supply board with scope
        by repair-it
        I am attempting to test a samsung power supply board to verify the pfc ic is working. I am powering up the board with my isolation transformer. The board turns on fine but when I attempt to connect the ground for the scope probe, it trips out the isolator. I was taught not to 'float my scope' so I am wondering if I should test without connecting the ground lead or would that be asking for trouble? Not sure how else to test, I don't have a portable scope. I could plug direct to mains power but that would bypass the safety factor.
        07-12-2025, 11:00 AM
      • Loading...
      • No more items.
      Working...