I tested a couple of the oscillators. The Reference Output Voltage does not
plateau as the input voltage is increased. It does hit 3.00V for an input of
3.3V. It is at 4.5V when the input is 5v and keeps climbing well past 5V as
the input voltage is raised. So, it appears to be a simple 0.9 times the
input voltage. One unit failed at 12V. At 3.3V, the initial current drain is
0.45A for a net power of 1.48W and after a short time the current drops to
0.16A for a net power of 0.53W. Both numbers are well below the maximum
ratings, but typical ratings are not given and the rapid drop between the
two plateaus indicates the oven controller is working fine.
So, my bet is placed on the devices being 3.3V.
John WA4WDL
--------------------------------------------------
From: "Peter Gottlieb" <[email protected]>
Sent: Friday, December 23, 2011 2:57 PM
To: <[email protected]>
Subject: Re: [time-nuts] eBay Giveaway Vectron OCXOs
A search of the Vectron site for OCO500 (which is on my unit) brings up a
datasheet which references that as a "replaced" unit.
http://www.vectron.com/products/ocxo/c4550.pdf
Shows there are 5, 12 and 3.3 volt options. I don't see where 4.8 volts
is a reference output voltage, the closest is 5 volts with the 12 volt
unit. I would put the unit on a variable bench supply and slowly raise
the input voltage to see where the reference stops increasing but I would
hazard a guess that it is a 12 volt unit. If you increase the supply to
5.5 etc then in that case you would see the reference stop increasing at
5.0.
Peter
On 12/23/2011 2:42 PM, Magnus Danielson wrote:
On 12/23/2011 08:26 PM, [email protected] wrote:
Running it at 5V with a Ref out at 4.8V would seem too close. Maybe it's
a
12V part?
If nothing else this could be a very stable, ovenized 4.8V lab
reference
source..
Is anyone planning to monitor the aging/stability/noise of this
reference?
My guess would be for 12 V, but 5V would be one to try.
Measuring the frequency stability on 5V would be one thing to try.
Cheers,
Magnus
bye,
Said
In a message dated 12/23/2011 07:28:34 Pacific Standard Time,
[email protected] writes:
Thanks for all the responses. A quick check before breakfast shows
that
mine would seem to be for 5 Volts since the power consumption at that
input agrees with the data sheet referenced; the current peaks at 0.95 A
warming up and 0.13 A warm. Reference V out is 4.8 V.
Dan
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