Did you try to?re-do the vertical calibration? Can you look at the
waveform during the measurement process to see if it is loading the input
down?
?
?
Strange one. Hope you find it.
?
Tom
?
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----- Original Message -----
Sent: Wednesday, January 02, 2013 6:58
PM
Subject: [TekScopes] Re: 2465B auto
measurment error
?
Any ideas?
B
--- In TekScopes@...,
"andersen_bill@..." wrote:
>
> I posted
a few months ago on this scope.
>
> I was not able to get this
resolved at the time and got busy on other projects.
>
> I want
to take a fresh look at it now.
>
> Here is an example of what I
am seeing.
>
> Using a function generator with 50 ohm
termination, frequency set to .5 MHz, volts 4.0 peak to peak- out of the
function generator.
>
> If sending a square wave the scope will
auto measure the voltages corectly.
>
> Example;
>
>
peak to peak 2.02 volts
> pos peak 1.01
> neg peak 1.01
>
> If I change to a triang. wave. (frequency and voltage the same) the
scope will now not measure the voltages correctly.
>
>
Eample;
>
> peak to peak 1.1 volts
> pos peak .97
volts
> neg peak .14 volts
>
> If I measure manually using
the cursers, they are correct.
>
> I verified the trigger cal.
and did a DC balance.
>
> Please help.
>
> Thanks,
B
>
