[time-nuts] z3801 supply voltages

g4fre at g4fre.com g4fre at g4fre.com
Sat Sep 26 17:13:08 UTC 2009

All my current z3801 have a label on the back against the power connector 
saying "38-60V" and indeed they do work over the whole range, i tried it! 

I chose a 48V psu and they have been running fine for years now 

At one time I assumed (from the k8cu site) that all z3801 were ~48V. That 
was until i applied 48V to one and it got very upset. After removing the lid 
I saw the dc-dc converter on the psu board was labelled "19.5-30V". 
Replacing the psu with a 48V version one and all was well again. 

Since this time I have seen z3801 that have labels saying "19.5-30V" near 
the power connector (but not the one that got upset) 


> In a message dated 26/09/2009 15:40:29 GMT Daylight Time,  
> james.p.lux at jpl.nasa.gov writes: 
> Of  course, another problem is that the Z3801A doesn't use 48V. It takes  
> more
> voltage, from K8CU's site: The Z3801A is specified by HP (depending  upon
> model) as  either a nominal minus 54 or plus 27 volt device. The  best bet
> is to keep the voltage at the nominal value specified by HP.   

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