Re: Strange Tek2440 issue - SOLVED!


Ray
 

That would be a VDR ©   ;)Sent from my T-Mobile 4G LTE device------ Original message------From: SiggiDate: Thu, Sep 10, 2020 13:56To: TekScopes@groups.io;Cc: Subject:Re: [TekScopes] Strange Tek2440 issue - SOLVED!On Wed, Sep 9, 2020 at 8:32 PM Vince Vielhaber wrote:

Ok, the problem has been solved!

Congrats!

As I mentioned before, I lifted one lead of both resistors (and a couple
of others) and they were all within spec. Strangely enough, it took
another 6.8K across R875 (a 6.19K) to drop pin 2 (inv) on U870 to 0.10V
less than pin 3. Measuring R875 again (with a lead lifted) it was
giving a new value.
How quaint, but I guess it happens. I had a problem in my 485 sweep
generator where a precision resistor went voltage dependent on me. Measured
up just fine on a DMM, but beat Ohms law handsomely at its working voltage
:/.

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