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Products => Test Equipment => Topic started by: Ice-Tea on September 06, 2018, 04:03:21 pm

Title: Wanna see an OXCO heat up?
Post by: Ice-Tea on September 06, 2018, 04:03:21 pm
OXCO heating up (https://youtu.be/z8WEtVMC5qs)
Title: Re: Wanna see an OXCO heat up?
Post by: T3sl4co1l on September 06, 2018, 04:21:36 pm
So what, starting up cold and monitoring its output?

Congrats on the 1000th by the way ;)

Tim
Title: Re: Wanna see an OXCO heat up?
Post by: xrunner on September 06, 2018, 05:15:46 pm
I think your spectrum analyzer has a bad drift.  :-DD
Title: Re: Wanna see an OXCO heat up?
Post by: Ice-Tea on September 06, 2018, 05:17:11 pm
What 1000th? Oh, this one! Yay!

Hadn't noticed ;)

Yeah, turning on a boat anchor and monitor the output. Nothing earth shatering, obviously, but I thought it neat.
Title: Re: Wanna see an OXCO heat up?
Post by: Ice-Tea on September 06, 2018, 05:18:12 pm
Quote from: xrunner on September 06, 2018, 05:15:46 pm
I think your spectrum analyzer has a bad drift.  :-DD

Heh, no. The SA is rock steady. This is a HP8662A cold start. Also rock steady after 15 min or so.
Title: Re: Wanna see an OXCO heat up?
Post by: capt bullshot on September 06, 2018, 05:24:00 pm
These:
http://wunderkis.de/mg3633a/ (http://wunderkis.de/mg3633a/)
take an hour for their OCXO to reach the final frequency.
What a coincidence, I've also used a CMU200 to watch that, so your video looked quite familiar.
Title: Re: Wanna see an OXCO heat up?
Post by: Ice-Tea on September 06, 2018, 05:31:46 pm
Heh, yeah, CMU200 ;)

The Anrtisu looks and 'feels' like the same era as the HP.
Title: Re: Wanna see an OXCO heat up?
Post by: capt bullshot on September 06, 2018, 05:57:01 pm
http://hpmemoryproject.org/timeline/bob_devries/hp8662a_01.htm (http://hpmemoryproject.org/timeline/bob_devries/hp8662a_01.htm)
Looks like one can derive the block diagram from the modules arrangement  :)
The Anritsu looks completely different inside, but in the same ballpark of specifications and features.
Anyway, the CMU200 isn't good enough to see the phase noise of these beasts.
Title: Re: Wanna see an OXCO heat up?
Post by: Ice-Tea on September 06, 2018, 06:15:39 pm
Quote from: capt bullshot on September 06, 2018, 05:57:01 pm
Anyway, the CMU200 isn't good enough to see the phase noise of these beasts.

Which should be pretty damn good if the marketing blurb is to be believed ;)
Title: Re: Wanna see an OXCO heat up?
Post by: texaspyro on September 07, 2018, 02:39:09 am
I put an Oscilloquartz 8663 DOCXO on a Gerry Sweeny board into my HP-53132A counter.  Here are plots during initial warmup, day1, day7, day30, and day60.  And people wonder why OCXOs are kept powered on all the time.