[time-nuts] FTS4060/S24 Location of E26 Test Point & ConfirmOperation?

[Tom Van Baak]

The jitter will be there if free-running or locked. If it is
on-frequency to 10 or 11 digits you either got lucky with
the way the OCXO was last set or it is in fact locked.

Wait a few more hours and if it hasn't drifted then you're
locked for sure. Or turn it off for a minute and fire it up
again and watch the frequency wobble around and then
stabilize.

Does the green lock LED come on?

/tvb

----- Original Message -----
From: "Brooke Clarke" <brooke at pacific.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Thursday, January 06, 2005 14:06
Subject: [time-nuts] FTS4060/S24 Location of E26 Test Point &
ConfirmOperation?


> Hi:
>
> For the last few days I have been working on my FTS4060/S24 s/n 1013.
This is the unit that arrived metal banded to a shipping pallet sitting on
top of it's well padded box.  Since the control voltage is continuously
ramping I followed Appendix A in the operation manual and adjusted the Loop
Gain and Control Voltage using the front panel switches and now the Green
Lock LED is on.
>
> Now for the questions:
>
> (1) Fig 2-5B shows the R5 pot that should be adjusted until the voltage
between E23 (ground) and E26 (test point) is 1.8 +/- 0.2 Volts.  I can find
E23 on my /S24 unit but not E26.  Does anyone know where E26 is located?
>
> (2) I'm trying to come up with some way to see if it's really working.  I
have a SR620 Time Interval counter using the 10 MHz output output from the
SR PRS10 as it's reference.  I have the 1 PPS from the PRS10 connected to
the A input and the 1 MHz output from the 4060 connected to the B input.
The counter is set for TI mode trigger on B and average 10 readings.  The
idea is that the rising
>
> The display shows .9936202, .993630, .993601 i.e. there is some change at
the 10 micro second digit, this seems to be wrong, maybe there should be
change at the 10 ns digit.  What am I doing wrong?
>
> Measuring the FTS4060 frequency gives: 9,999,999.99278, .99368, .99239
i.e. a jitter Allan variance of about 12 milli Hz or parts in 10^10 or not
as good as I would hope.
>
> Any ideas on how to confirm proper operation?
>
> 73,
>
> Brooke Clarke, N6GCE
> --
> w/Java http://www.PRC68.com
> w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
> http://www.precisionclock.com
>
>
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