[time-nuts] DC-DC converter
GandalfG8 at aol.com
GandalfG8 at aol.com
Sat Sep 26 16:19:42 UTC 2009
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. This way any
out of specification internal DC to DC converters are satisfied, and the
units will perform normally. Reports from other users confirm this.
----------------------
Most Telecom supplies do seem to be around the -54 volt mark, the one I use
for the Z3801A is a bit lower than this at -55.1 volts, but the Z3801A
itself is marked 38 to 60 Vdc.
Whilst the HP Specification, as per page 5-4 of the manual, is -54 Vdc
nominal it does then go on to clarify this as being.....
-60 Vdc +/- 0.5 Vdc to -37 Vdc +/_ 0.5 Vdc operating range, less than -46
Vdc +/_ 0.5Vdc starting.
As expected from the above, PSU problems tend to be more noticeable at
startup if higher voltages, ie closer to zero, are used but a regulated -48
volt supply should be fine.
regards
Nigel
GM8PZR
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