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

Brooke Clarke brooke at pacific.net
Fri Jan 7 01:28:35 UTC 2005


Hi Tom:

The Green Lock LED has been on for 4 1/2 hours now.
The 1 MHz output is still reading 999,999.99xxx  Hz.

How do I use the Zeeman input on a 4060?

73,

Brooke

Tom Van Baak wrote:

>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
>>
>>
>>_______________________________________________
>>time-nuts mailing list
>>time-nuts at febo.com
>>https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>
>>
>>    
>>
>
>
>
>_______________________________________________
>time-nuts mailing list
>time-nuts at febo.com
>https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>
>
>  
>

-- 
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com




More information about the Time-nuts_lists.febo.com mailing list