Thanksfor all of your input.
I redid the cal 2 and 3. Vertical and triggers.
Error is still there. Looks like at low frequencies-below .5 MHZ it works, above that the error occurs.
I am thinking there is a problem with the U500 trigger.
I see a few on Ebay. Anyone here have one for sale?
B
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--- In TekScopes@..., "Tom Miller" wrote:
Yes, it is a 1 kHz square wave at 0.5 volts PP if I remember right. I use the CG-5011 to do mine.
Ok, looking at the procedure, it wants 0.5 VPP @ 1kHz and 2 VPP @1 kHz. Both square wave.
See the Cal-03 section.
Tom
----- Original Message -----
From: andersen_bill@...
To: TekScopes@...
Sent: Thursday, January 03, 2013 12:01 PM
Subject: [TekScopes] Re: 2465B auto measurment error
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
--- 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
> > >> >
> > >>
> > >>
> > >
> > >
> > >
> > > ------------------------------------
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> >
> >
>
