Using a scope

[Frederic Breitwieser]

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Fear not Mr. Mechanical <smile>, most 'scopes have a high enough impedance 
(loading capacity) that you can snoop around circuits without causing 
issues, and you can directly attach your 'scope to the injector, and view 
the pulses directly.

Most oscilloscopes have a test generator for calibration, you can attach 
the input probe to this generator, which typically is a 1 khz signal, and 
see the waveform on the screen.  If you have a wave on the screen, its 
working.  However, some of the older scopes (including mine) has drifted in 
accuracy due to parts aging, however for automotive use, I've gotten use to 
it enough to get the idea.

Feel safer?  BTW, just joshing :)

Frederic Breitwieser
HomeBrew Automotive Mailing List
Bridgeport Connecticut
http://www.geocities.com/MotorCity/Downs/4605/index.html



----------
From: 	Joe Boucher
Sent: 	Thursday, June 19, 1997 10:14 AM
To: 	diy_efi at coulomb.eng.ohio-state.edu
Subject: 	Using a scope

Being a mechanical engineer, I have a natural fear of electrons or in
other words a little knowledge is dangerous.

If you hook up a scope to something like a injector circuit are you
suppposed to use isolator transformers or somekind of isolation circuit
to protect the scope?  Are these built into the scope?

In Dallas on the first Saturday of each month, there is a swap meet for
electronic stuff.  It started out decades ago as a ham radio meet, but
as evolved to a computer orientation.  There is a lot of test equipment
there including HP stuff.  Can I tell if a scope works properly as long
as the guy can turn it on?

Joe boucher
'70 Camaro, '81 TBI Suburban
Bedford, TX

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