[Boatanchors] measuring ripple?

[Lawrence Mayhew]

Check your Tektronix 475 oscilloscope manual specification on input voltage
levels.
My recall is that the input capacitor can handle 600 volts (at least when it
was manufactured) so you should have no problem with the plate potential
mentioned.
Regards,.........Larry in Seattle (retired Tek scope designer)

-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of
eugene at hertzmail.com
Sent: Thursday, June 14, 2007 6:42 PM
To: boatanchors at mailman.qth.net
Subject: [Boatanchors] measuring ripple?

Hello all,

I have been working on a heathkit sb-610. Seems my tone output has 60hz
hum on it. So I want to use my scope to look at the ripple on the +215V
plate supply for this circuit.  My scope is a tek 475.  Can I simply put
the coupling on AC and connect to the 215v line? I am afraid that 215 is
too much for the scope. I understand that putting the scope in AC mode
puts a cap in series to block any DC, but surely there must be a limit
to how much DC it can block, no?

Are there other ways to do this? Can I use my DVM in AC mode or
something? 
Thanks
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