[R-390] R-390 C101 and C103 Caps

[Tisha Hayes]

Roy wrote,

*"The surge voltage on that cap will happen before the series regulators get
heated up, so a quick measurement at turn-on will be needed to find out what
you need.  Here is where the DVM is best set aside and a VTVM with moving
needle used."
*
-- I am a big fan of VTVM meters for high Z measurements where the loading
on a circuit by a DVM really throws off a reading, for the ease in peaking a
level like the diode load level by watching the swing of a needle and when
measuring RF levels with a high frequency meter (some of the HP 400 family
meters are great for this) are the best choice. The use of a really good DVM
on peak measurement readings of B+ may actually be a better choice in some
cases.

To measure very fast peak rises on a non-high-impedance circuit I still use
a top end Fluke DVM with a fast capture option and with peak hold
capability. I have found that the measurement accuracy of a good Fluke
rivals a capture and hold oscilloscope for measuring fast transients and
gives me a fast capture peak-hold capability when measuring current as well.
>From an aesteic standpoint a tube meter with a mechanical movement is what
the R-390 was originally designed to work with back in the 50's and 60's. We
cannot forget that there are pieces of modern test equipment that will
surpass the capabilities of a good old VTVM for certain applications. --
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