[TenTec] OT: Scopes

[kc9cdt at aol.com]

Yep...makes sense...so the normal Tek scope probes...what are they 
rated at?
Lee



-----Original Message-----
From: Ken Brown <ken.d.brown at hawaiiantel.net>
To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
Sent: Mon, Feb 20, 2012 2:59 pm
Subject: Re: [TenTec] OT: Scopes




> What if I want to look at the plate?
>
>
>
>
If you are looking at low level stages with only 100 volts DC or so you
could use a 250 Volt rated probe. The probe rating should be as high as
the peak AC voltage PLUS the DC voltage that is at the point you are
connecting it. Generally two times the DC voltage will be good enough.
The AC signal generated at the plate of a tube is seldom greater than
the DC plate voltage. If the tube has 125 VDC on the plate you should
use a 250 Volt rated probe.

When making these kinds of measurements it is best to connect 
everything
with the power off, and then keep your hands off the probe when the
power is on.


> The RF or Audio signal from the RX stage is passed on through a
> capacitor to
> the next stage, otherwise you would have the high voltage on the 
input
> of
> the next stage.   Measure on the other side of the capacitor, not on 
the
> high voltage side.
>
> You need to consider the voltage specs of the probe, but most should 
be
> good
> for 250v.
>
>
>
>
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