[time-nuts] FE-5680A
Peter Bell
bell.peter at gmail.com
Thu Nov 10 22:37:36 UTC 2011
As far as I can see, the trimpot has no effect at all - the only frequency
trim on the unit is via the RS232 interface on pins 8 and 9 of the
connector I suspect this is adjusting the c field, but have not actually
verified this. It does definately change the output frequency, though.
On Nov 11, 2011 6:17 AM, <EWKehren at aol.com> wrote:
>
> Thank you Peter
> With Jose's and your input I will power it up in the morning. Mine has the
> same part # and a date code 0330. Does yours respond to the trim pot, I
> plan to bring out the tuning voltage to a modified Shera controller.
> Bert
>
>
> In a message dated 11/10/2011 5:03:07 P.M. Eastern Standard Time,
> bell.peter at gmail.com writes:
>
> Assuming it's the same as the units I have (two labels, with "FEI P/N
> 217400-30352-1" on the upper label and two barcodes on the lower
> label) then the +5V supply runs all the logic in the unit. There are
> no special power sequencing requirements, but you need both supplies
> for the unit to operate. The current drain on the 5V line is fairly
> low - about 90mA - the 15V will pull about 2A when the unit is cold
> and then drops to 500-600mA once everything is warmed up. Pin 3 is
> the lock indicator - driven low when locked. The output (10MHz sine)
> is present on pin 6, and appears immediately after power up - although
> the frequency is not accurate until the lock pin is asserted.
>
> The 4 digit prefix on the lower barcode is a date code - so "S/N
> 0416-77234" would indicate a unit made in week 16 of 2004.
>
> Regards,
>
> Pete Bell
>
> On Fri, Nov 11, 2011 at 12:30 AM, <EWKehren at aol.com> wrote:
> > I did purchase one of the "New" FE-5680A Rb's. Looking at packaging
and
> > the housing it does look new. I have not powered it up because of +5
> Volt on
> > pin 4. Does any one know its purpose and is there a power up sequence.
> Any
> > help will be appreciated.
> > Bert Kehren Miami
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