Using an Oscilloscope probe when using a DVM meters

Discussion in 'General Electronics Chat' started by SamEricson, Apr 26, 2015.

  1. SamEricson

    Thread Starter Member

    Apr 25, 2015
    I have been using an oscilloscope probe instead of regular DVM meter probes. Why I have been using an oscilloscope instead of using the regular DVM meter probe it because i was getting false logic triggering when probing test points or TTL/CMOS IC pins. I use a BNC to male banana plug adapter from my DVM meter to the oscilloscope probe.

    Have you heard of electronic technicians doing this and when would you use an oscilloscope probe when using a DVM meter to troubleshoot or test circuit boards?
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    Hi Billy Mayo...

    I would fire any tech who would use a 10X scope probe (designed for a scope that has a 1megΩ input impedance) ahead of a DVM that has an input impedance of 10, 20 or 100megΩ, for gross incompetence, because they obviously do not know what they are doing....
    Reloadron and #12 like this.
  3. SamEricson

    Thread Starter Member

    Apr 25, 2015
    What kind of DVM meter probes can I use that are "shielded" like a logic probe is for testing logic circuits?
  4. #12


    Nov 30, 2010
    Thanks for the reminder, Mike.
    I hadn't caught on yet.
    Pretty slow of me. :oops:
    Reloadron likes this.
  5. SamEricson

    Thread Starter Member

    Apr 25, 2015
    will i am getting false triggering when probing logic circuits when using DVM meter probes.

    I need shielded meter probes, do you know any i can use for testing TTL and CMOS logic circuits?

    How can I plug my DVM meter inputs into my analog oscilloscope?

    can i use the oscilloscope external input bnc jack because i think the external output jack is ment for 10 megs to go into an external DVM meter or counter
  6. dl324

    Distinguished Member

    Mar 30, 2015
    Have you checked your leads? Could you post a schematic of a circuit that you can't probe?
  7. DickCappels


    Aug 21, 2008
    Just for the record, when I built an RMS-to-DC adapter I made the input 1.0 Meg shunted by 20 pf so that I can use it with scope probes.
  8. SamEricson

    Thread Starter Member

    Apr 25, 2015
    The oscilloscopes ch#1 output is 50 ohms , it's ment to be plug into a counter or function generator

    The only way I will be able to use an oscilloscope probe with a DVM meter is to use an BNC "impedance matching adapter" or BNC termination adapter to match the Oscope probe to the DVM meter input?

    My DVM meter leads are shield but not shield like a logic probe or oscilloscope probe
    Last edited: Apr 26, 2015