Testing H7864 (MicroVAX II) PSU With No Load

Pete Turnbull pete at dunnington.plus.com
Sun Nov 1 14:37:42 CST 2015

On 01/11/2015 18:47, tony duell wrote:
> I've yet to find a DEC PSU that fails destructively if not loaded, it
> is more likely to just trip the overvoltaeg protection crowbar, shut
> down, then try to restart and repeat the cycle, tweeting as it goes

Then you've not come across the ones in TK50Z desktop cases (and a few 
other things).  They don't like operating without a minimum load, 
without which various parts sacrifice themselves to protect the fuse.  I 
once had to sort through a pallet load of them for repair.  The bonus 
was I got to keep three, which now house an assortment of RX50s and 
small hard drives.


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