Are you applying +5V to pin as well? See:
http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:fe5680a_faq
"Within 5 minutes after powering up (apply +15V on DB9 pin 1 and
+5V on pin 4) the unit should indicate lock (pin 3 voltage drops low)."
John WA4WDL
--------------------------------------------------
From: "Bob Stewart" <b...@evoria.net>
Sent: Saturday, September 21, 2013 10:55 AM
To: "Bob Stewart" <b...@evoria.net>; "Discussion of precise time and
frequency measurement" <time-nuts@febo.com>
Subject: [time-nuts] FE-5680A Loop Lock Indicator
The instructions I got with this Rb said that you could hook an LED
through a 5-10K resistor to the +15 supply and get a lock indication. I'm
using a 10K resistor and the LED lights as soon as it's powered up from
cold. Is the loop lock indicator circuit broken or is it just another
strange option for these things? I saw on one site that if you do it this
way it prevents lock, but mine seems to lock OK with or without the
voltage.
Bob - AE6RV
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