On 12 April 2016 at 07:13, w7qed@... [TekScopes] <
Then I got brave and hooked up my Simpson 260 from chassis to the "-2450"
test point (TP1423 I believe). On the 5kv range it hardly moved. On the 500
volt scale it went about half way up. On the DMM this measured -490V. Now,
it's 11 pm and I know better than to keep at it this evening (as much as I
want to). Any pointers? I will review the cathode voltage circuits tomorrow
and take another peek tomorrow evening.
What's the impedance of the meter? It's most likely that it's shorting out
the HV. You need to use a HV probe ideally with gigohm impedance.