[ARC5] Use of a Variac

[Tim]

The ZM-11 looks to be a capable instrument - Is it "military"?  If so, I
wonder where they were actually used.  Line Maintenence?  Organizational
repair? Depot repair?  Depot overhaul?  Manufacturer component parts QA?
DOD R&D Labs?  Lot of capability, looks cool!

Tim
N6CC

On Fri, Apr 24, 2020 at 10:56 AM David Stinson <arc5 at ix.netcom.com> wrote:

> With the ZM-11, you set the internal DC supply to the operating voltage
> for the cap, i.e. 450VDC.  The DC supply is developed by a low-current RF
> flyback system which can deliver several mA without any trouble and will
> "live" if your cap is shorted. You don't usually have to "baby-sit" the
> process. Connect the cap.  The ZM will current-limit down to a lower
> voltage and start reforming.  Once the voltmeter makes it to operating
> Voltage (minus "normal" leakage, usually less than 1 mA) you're good to go.
> I've had a few that went ahead and shorted and many which can't "make the
> cut," but most are recoverable.  Don't remember ever having trouble with a
> cap after being acceptably reformed.
> That said, when more desirable and available, I will install new caps.
> 73 Dave S.
> On 4/23/2020 6:25 PM, Mike Feher wrote:
>
> Most of the reforming I did, I used my time. I would start at a low
> voltage at a comfortable current like about 5 ma and then wait and do
> something else. Come back to it and if the current went down I would
> increase the voltage for the same current, and so on. I kept it up till I
> reached rated voltage
>
>
>
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