The SM lists A "standard amplitude signal generator" for setting the triggers.
I have been using a function gen set to 60Hz with a sign wave. The cal accepts the input and the triggers appear to bet set correctly when the trigger is manually adjusted.
Is there a specific frequency and or type of signal required for the the trigger cal?
B
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--- In TekScopes@..., Jeff Machesky wrote:
I would adjust the trigger and see if it can reach the very edges of a
sine wave. If it stops triggering before the peaks then something is out
of calibration or hopefully not busted. Mine is off a little bit, but
it's off by the same amount that my mentioned test shows. It almost
triggers to the peaks..but not right to the edge. So my calculated
reading is a bit low. In my case I just need to rerun the trigger
calibration and do a bit better job. The Para-metrics are based on the
trigger from what I've read and then also have their own calibration for
frequency.
Jeff
On 1/2/2013 7:17 PM, Tom Miller wrote:
Yes, I believe that is correct. Maybe pull the U500 and clean the
contacts
carefully?
Does it do the same for all the channels?
Do you have or can get a spare U500?
Tom
----- Original Message -----
From: "Jeff Machesky" >
To: >
Sent: Wednesday, January 02, 2013 8:30 PM
Subject: Re: [TekScopes] Re: 2465B auto measurment error
Doesn't it use the trigger functions to do the auto voltage measurements
? I thought it just adjusted the trigger voltage up and down until it
found the peaks of where it could trigger and then just reported that
back.
Jeff
On 1/2/2013 5:18 PM, Tom Miller wrote:
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
----- Original Message -----
*From:* andersen_bill@...
> >
*To:* TekScopes@...
> >
*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
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