piclist 2002\08\22\133228a >
Thread: measuring jitter on a scope
face BY : Jim email (remove spam text)


These scopes have actually three trigger modes
as determined by the "Trig Mode" push buttons:

Auto - sweep with or without trigger signal.
       (results similar to the old recurrent-sweep
        scopes like the EICO 460! and old Heaths)
Norm - the scope -only- sweeps with tgiggering signal
       criteria being met
Swp  - Single sweep

Also, you can choose your trigger to be DC
or AC - and the AC mode has like a 20 Hz
or so low freq cutoff.

So, I would choose DC. By careful adjustment of the
"A Trigger" "Slope" and "Level" control you
should be able to trigger off a slow-moving
waveform as it crosses the trigger threshold.

Also, be sure to choose "DC" coupling on the switch
located below the rotary "Volts/Div" switch on the
channel you're working with!

Next question - is this just a one-axis gyro (I've
not played with the recent crop of piezo gyros,
my expereince was with the mechanical stuff a
few years back).

RF Jim

----- Original Message -----
From: "Bob Japundza" <.....Bob.JapundzaTakeThisOuTspamREALMED.COM>
Sent: Thursday, August 22, 2002 11:26 AM
Subject: Re: [EE]: measuring jitter on a scope


I have set it as you describe and have no idea why it isn't triggering.  The
dc output of the gyro is proportional to rate acceleration, approx
20mv/deg/sec.  I do get some sine waves on the display, but when I rotate
the gyro I don't see any change in amplitude.


> {Original Message removed}
<000701c24a01$f0100680$0100a8c0@piii500a> 7bit

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