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On Jun 9, 2019, at 16:06, nonIonizing EMF <nonionizingemf@...> wrote:

On Sun, Jun 9, 2019 at 07:25 AM, David Berlind wrote:


3. The 620B did not come with any probes when I purchased it. I noticed from
the 620A documentation that that scope originally came with a 6139A probe
which lead me into an exploration of probe characteristics. That probe's specs
appear to match the 500Mhz capability of the scope. Over the last two years, I
haven't thought much about the probes themselves. Just been using what I
acquired along the way and things seem to work. So, in the spirit of rooting
out any configuration problems before needing to effect any repairs, to what
extent could basic probe differences impact behavior? For example, I have some
basic 1X/10x probes (which might not be rated for 500Mhz) that work nicely on
my 7603. What incompatibilities could exist between these probes and the 620B
such that I might get unexpected/inaccurate behavior?

Here are some references for those not on the FB Old Tek Scopes group, might not have seen the latest post regarding Tek probes or haven't seen these references before ( ) :




I'm thinking these are older probes references so might not be pertinent though may have some utility from the info in the links:

(two links might provide some details)

(more of an older scope reference)


I've not gotten around to verifying the "A", "B", "C" and "D" model codes... though seems from general reading there are TDS-5XX/6XX/7XX family associated capabilities detailed (I forget at the time being).