From: "Jeff Verive"
Subject: Re: can I see the vibration?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Fri, 10 Jan 2003 17:29:02 -0600
NNTP-Posting-Date: Fri, 10 Jan 2003 17:29:02 CST
Connect the probe's ground lead to its tip, and use this as a "sniffer"
without actually touching any components. If the magnitude of the
measurement is important, I like to use a cap that is 1/19th the probe's
capacitance, in series with the probe tip. This usually reduces loading to
a minimum, and it forms a 1/20 voltage divider that makes for easy mental
conversion. I keep a lot of low-value caps around (with short leads) for
just this purpose.
Not only are these "tricks" easy to do, they usually blow away the
uninitiated (and impress the management).
Of course, if the loading is still too much, you can add another small cap
in series. "Robert Baer" wrote in message
> tsj wrote:
> > I am trying a RF tranceiver powered by a 9V battery. Can I see the
> > oscillation with scope? will the probes influence the oscillation? How
> > know the oscillator works if the probes kills the oscillation?
> Presuming the bandwidth of the scope is wide enough to give a
> reasonable indication, connect the probe ground lead to the circuit
> board in question, and hold the probe tip within 1/8 inch (more or less)
> from the output lead.
> Or, use a radio tuned to the Xmitter freq.