[R-390] More "bad" resistor comments and questions (a bit long)

[paolo gramigna]

Hi,
My experience is too thin to set out definite answers, but I have learned
very soon to test all capacitors using a megger, not a tester. I use a
surplus AN/PSM-2A. A capacitor with infinite resistance on a tester will
show less than 1Mohm on a megger, if leaky. Same for sockets (at least the
non-ceramic ones). When I suspect a resistor, first I check the resistance
and voltage as stated in the voltage/resistance table in the manual; if
there is more tan 10% difference, then I'll clip one end and measure it with
a "bad" ohmmeter (something with 1000 ohm/volt) in order to put some current
in it. At that point, being the resistor already clipped, it's usually
faster and safer to replace it with a new one; I'm told that metal oxide
resistors are more stable than carbon, and smaller too.
 
cheers,
Paolo from Italy