Simpson 260 VOM's provide 20 kOhms/volt sensitivity on all DC volts
ranges, as the basic meter movement is 50 microamps. A Simpson 260 with
a 5 kV range therefore provides circuit loading of 100 megohms. Many
(most?) of the 260's do not have a 5 kV range.
Mike N4MWP
On 04/12/2016 06:10 AM, Malcolm Hunter malcolm.r.hunter@...
[TekScopes] wrote:
On 12 April 2016 at 07:13, w7qed@... [TekScopes] <
TekScopes@...> wrote:
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.
Malcolm
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]
Mike Dinolfo