Re: New Member intro and needing help
Hi Jim,toggle quoted messageShow quoted text
Thanks for the comments.
Kind regards,DBN, aka John
On Saturday, July 2, 2022 at 07:48:22 AM EDT, Jim Adney <jadney@...> wrote:
On Fri, Jul 1, 2022 at 09:50 AM, druid_noibn wrote:
What would be a good or appropriate power-up procedure for for older 'scopes that sat on the shelf for a few years?There are two good approaches:
Bring it up slowly on a Variac. This has the advantage of giving alum electrolytic capacitors time to reform before they get full voltage
Build a fixture that puts an incandescent bulb in series with the old device. I built mine using a 2x4 box and a cover that had an outlet and a socket for a screw-in (Edison base) lamp. Choose a bulb that will almost, but not quite, blow the fuse. As long as the lamp doesn't glow brightly, you're okay. If the lamp suddenly goes bright, you know that something in your old device has shorted.
You could also do both, using the Variac to bring the voltage up slowly, while watching the lamp to monitor the current.