Jim,

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.=20

Bob

> -----Original Message-----
> From: Jim [mailto:jvpoll@DALLAS.NET]
> Sent: Thursday, August 22, 2002 11:01 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: measuring jitter on a scope
>=20
>=20
> Bob,
>=20
> Can you explain why it is you have nothing to
> trigger off?
>=20
> I am assuming you can simply set the scope's trigger
> Source for CH 1, set for AC, adjust the level and get
> triggering ...
>=20
> What is the output of the piezo gyro supposed to be?
>=20
> Is it DC proportional to something?
>=20
> I've got a 475 too, and the Horz scale is shrunk ...
>=20
> RF Jim
>=20
>=20
> ----- Original Message -----
> From: "Bob Japundza" <Bob.Japundza@REALMED.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Thursday, August 22, 2002 10:25 AM
> Subject: [EE]: measuring jitter on a scope
>=20
>=20
> I am working with a piezo gyro that puts out a bit of=20
> noise/jitter in its
> output.  I have a couple of different op-amp filter circuits=20
> I've thrown
> together to see how well they clean up the output of the=20
> gyro, but at the
> same time not screw with the bandwidth of the gyro's output. =20
> The gyro puts
> out approximately 2.5v at a steady state, and goes up/down from there
> depending on the direction of rotation.  I have been trying=20
> to measure the
> noise level of the output with my scope without success; I=20
> assume it is
> because I don't have anything to trigger off of.  My guess is=20
> that I need a
> function generator (which I don't have at the moment, but one=20
> is on the way)
> tied into the external trigger input of the scope and=20
> "sample" that way.
> Can anyone tell me that I'm correct in my thinking?  What=20
> frequency should I
> use to sample the output?
>=20
> Also, it seems my scope is a bit out of calibration (Tek=20
> 475).  I have just
> located some manuals on ebay; is it difficult for one to=20
> calibrate this
> scope, or should I be looking to send the scope off somewhere to be
> calibrated?
>=20
> thanks,
>=20
> Bob
>=20
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>=20
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>=20
>=20
>=20

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