[time-nuts] Isotemp OCXO trimpot question...

Jerry jsternmd at att.net
Mon Aug 27 20:10:28 EDT 2012


I don’t know if the list allows attachments but I tried to attach to this
email a datasheet for a very similar Isotemp 10Mhz OCXO (Model OCXO134-10;
PN 6624.00002).   Just in case the attachment doesn’t come thru here is the
relevant section.  

I am not certain whether the pins are the same as your model but I believe
all the Isotemp OCXO have same arrangement:

3. ELECTRICAL FREQUENCY ADJUSTMENT
	3.1. Range 		> ±0.45 PPM 
				< ±1.2 PPM (At time of shipment) (Referenced
to nominal frequency)
	3.2. Control 		0 VDC to Vref (0 VDC to +8 VDC ) or a 10 kW
potentiometer connected between pins 2 and 4 with wiper connected to pin 3.
	3.3. Slope 		Positive
	3.4. Center 		Vref/2 ±10% of Vref (+4 VDC to +0.8 VDC)


Jerry


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Azelio Boriani
Sent: Monday, August 27, 2012 6:57 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Isotemp OCXO trimpot question...

If there is no datasheet to refer to then the usual value is between 10K and
20K.
10K is the most common value for 5V or 8V Vref. The OCXO should provide the
Vref output pin to connect one side of the pot, the other to GND, for a GND
referenced EFC. Your mileage may vary but, without a datasheet, it is the
best starting point.

On Mon, Aug 27, 2012 at 11:26 PM, Bud Patten
<bud.patten at frontiernet.net>wrote:

> I have an Isotemp OCXO (674-0010-000) an am wondering what is the 
> recommended value for the frequency trim pot?
>
> Bud
> W0LCP
>
> Time is only there to prevent
> everything from happening at once.
>
> Einstein
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