I own two of these power supplies (which I'm trying to sell), and you could
lift the point E3, the junction of the negative of the filter capacitor with
the lower end of the choke, place your current sample resistor from E3 to
ground, then wire the current sample to either C or D on J1, which are
spares. If you wanted to float the entire negative high voltage supply, then
wire E3, and E2 in parallel over to J1 pins C, and D. I wouldn't float the
entire negative supply much above ground unless you mount L1, the 8 H
swinging choke on standoffs, as it's insulation won't support the full 3300
volts which is why it's in the negative side in the first place.
Note that E3 also has a ground to the negative of the 13.6 VDC supply, and
the line neutral. You would want to leave that at ground potential, just
isolate the high voltage supply.
-Doug
W6DSR
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Ron Youvan
Sent: Thursday, January 5, 2017 01:48 PM
To: amps
Subject: Re: [Amps] HARRIS PP-7913/URC POWER SUPPLY
Jeff KD4LYH Pederson via Amps wrote:
> I noticed that this power supply uses a choke in the B negative
lead.
> The B negative is grounded directly to the chassis. Most schematics
> for GG show the B negative lifted above ground a little for metering
> purposes. The panel meters I'm using are 0-1 amp full scale and 0-150ma
full scale.
> Can't I just bond the PS and RF deck together and strap the the meters to
ground.
I don't know this power supply, but generally the choke is part of the
power supply and needs to stay as it is and the point where it is grounded
can be lifted and connected through a big (10 Ampere) diode to ground in the
modern manor.
--
Ron KA4INM - Youvan's corollary:
Every action results in unwanted side effects.
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