[time-nuts] Once again about counter calibration

Scott McGrath scmcgrath at gmail.com
Sat Apr 25 15:18:21 EDT 2015


Or feed  both oscillators into a mixer and extract the difference which will be the offset of your DUT from your standard 

Content by Scott
Typos by Siri

> On Apr 24, 2015, at 10:36 PM, Brent Gordon <time-nuts at adobe-labs.com> wrote:
> 
> Just feed the PPS into the scope trigger on step 2.
> 
> The low repetition rate on the PPS would make this difficult on an analog scope; on a digital scope it is easy.  You can use any sub-harmonic that is less than or equal the counter reference frequency (10 MHz).
> 
> Brent
> 
>> On 4/24/2015 3:45 PM, d0ct0r wrote:
>> 
>> 
>> Hello,
>> 
>> The input: HP 5386A which I would like to calibrate, Well warmed Tremble
>> Thunderbolt (1PPS only), 10 Mhz Datum OCXO (unknown accuracy), Rigol
>> 1101E Oscilloscope.
>> 
>> The goal is to calibrate counter to read the Datum OCXO.
>> 
>> ===========================
>> 
>> Reading the manual for 5386A, there is simple schema for calibration:
>> 
>> 1. Connect HP 5386A 10Mhz OUTPUT to Oscilloscope
>> 2. Connect Frequency Standard to Ext. Trigger on Oscilloscope
>> 3. Adjust the frequency on 5386A TCXO for minimum sideways movement of
>> 10 Mhz signal
>> 
>> However, my Trimble TB 10Mhz output is currently in use. I have only
>> 1PPS signal available. The HP manual do not mention what exactly
>> frequency needs to be on "Frequency Standard" connected to Ext. Trigger.
>> Is there any method/option I could apply to calibrate HP counter ?
>> 
>> Thanks !
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