Re: Tektronix 7603 won't trigger



GanjaTron wrote:

On Jun 19, 9:49 am, Jorgen Lund-Nielsen <jorgen.lund-
niel...@xxxxxxxxxxxxx> wrote:

GanjaTron wrote:

Well, I replaced the CA3046s with a pair of CA3086s. Triggers fine
now. Having said that, there's some noticeable noise (as in
flickering) in the trace. I checked the power supply caps with a
capacitance meter, and they look ok (so do the supply lines measured
with another scope). Any ideas what else I should check?

Regards,

--Roland

You also have to check the ESR of the electrolytics with an ESR-Meter.
Often elytics have still their capacitance but the ESR goes up and than
they are nearly functionless.


Hmmm, even if I had an ESR tester at hand, I wouldn't have the
reference values. Is there a "sane" range for these big-ass caps?

--Roland

Hi Roland,

the most ESR-Meters have a reference list printed on the housing
as you can see here on some pics:

http://www.electronicrepairguide.com/capanalyzer%20esr%20meter.jpg

http://www.nippur.hu/esr_meter_nagy.jpg

http://www.electronicrepairguide.com/esr%20capacitor%20tester.jpg

Jorgen
dj0ud
.

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