Fw: Re: Probe Question

[W. Kranitz]

His Configuration looks like a PK-1 Universal probe. The value of the
resistors depend on the desired out impedance (3.6 or 1 Megohm).
An earlier version was fixed at 3.6 output impedance. Also, the
variable cap. was 5-20uuf in the older version, but 4-40uuf in the
newer version.  I have one and I have both Schematics sitting
in front of me.

Gary Harmon wrote:
>
> The probe in question sounds like the Model 342 Low Capacity Oscilloscope
> Probe.  The resistor across the cap is actually a 22M not the 2.2M as stated
> in the original e-mail.  Also there is not a 240K resistor between the tip
> and ground.  Perhaps the resistor change and added resistor were upgrades to
> improve performance.  I have a copy of the spec sheet and will be glad to
> scan the details for anyone needing them.
>
> Best 73,
> gary
>
> =======================
> Gary H. Harmon, Jr. - K5JWK
> 6302 Robin Forest
> San Antonio, TX  78239
> (210) 657-1549
> gharmon at idworld.net
> =================
>
> -----Original Message-----
> From: Jay <jstrat at teleweb.net>
> To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
> Date: Sunday, November 15, 1998 2:18 AM
> Subject: Re: Probe Question
>
> >I have a probe almost exactly like that only mine also has a diode. It
> >functions as a demodulator probe. Coaxial cable exits the back of the
> probe,
> >(a clue) which means it carries an HF demodulated signal.
> >-----Original Message-----
> >From: Conrad Hoffman <crhoff at BELLSOUTH.NET>
> >To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
> >Date: Saturday, November 14, 1998 2:47 PM
> >Subject: Probe Question
> >
> >
> >>Hi,
> >>
> >>Just paid 50 cents for what looks like a Heath probe of some kind.
> >>
> >>Has a switch and a trimmer cap you can adjust thru a hole in the AL tube.
> >>The tip goes either stright thru or thru a 2.2 meg resistor with a 5-20 pf
> >>variable across it.  In either case there is a 240K resistor between the
> >tip
> >>and ground.
> >>
> >>Anybody recognize it?
> >>
> >>Conrad   W8MHH   crhoff at bellsouth.net
> >>
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