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

jmfranke jmfranke at cox.net
Tue Aug 28 20:24:52 EDT 2012


Now I need to find a 10 KW potentiometer!

John

--------------------------------------------------
From: "Jerry" <jsternmd at att.net>
Sent: Monday, August 27, 2012 8:10 PM
To: "'Discussion of precise time and frequency measurement'" 
<time-nuts at febo.com>
Subject: Re: [time-nuts] Isotemp OCXO trimpot question...

> 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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