[time-nuts] HP 5370B dropping mains voltage

[Mark C. Stephens]

How Does that Work Robert?
I mean why out of phase?

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Robert Atkinson
Sent: Sunday, 7 July 2013 12:57 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 5370B dropping mains voltage

Hi Marki, 

Dropping the mains voltage is easy. Get a mains to low voltage transformer. Connect the primary across the mains and the secondary in series opposition (out of phase) with the mains supply. Foar example a 100VA 12V transformer will drop your mains to just under 238V with a maximum load of 8A (the current rating of the secondary). 


HTH,
Robert G8RPI.



________________________________
 From: Mark C. Stephens <marks at non-stop.com.au>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
Sent: Saturday, 6 July 2013, 13:25
Subject: Re: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting normally, PB ...
 

Hi Nigel, 


The only screw type electro can find is 29000uf at 10V. it's the same dimensions.
Should I risk the strain on the rectifiers (another 10Kuf is rather a lot)?
Without this timer I am dead in the water so I need to do the right thing here...

That's why I posted on the Agilent group too, I need to be sure that I do the right thing!

By the way, the failed electro measures 39uf :)

I reckon, the line voltage here is 250v and the equipment is set for 240V, that extra 10V on the mains is why I am having so much equipment failure.
Also the Heat sink on the 5370B got so hot I mounted a 5" fan across it to keep it at a respectable temperature.

How can I drop the Mains to 240V, I have a boat load of gear that needs to be powered concurrently.
(8566A, 8568B, 3585A, 5335A, 5370B, 8901A, etc, powered on together) we are starting to talk some serious current there.


-marki


-----Original Message-----
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