[time-nuts] 10MHz Rubidium reference source for frequency counter
ra3apw at mail.ru
Mon Nov 3 08:48:01 EST 2014
yes, it is my fault - my set up (connections) for TI mode was not correct.
According your advices I went back to the frequency mode and set gate / sample time to 1 second for CNT-91 and TimeLab.
Then I switched on "Smart Frequency" and "Interpolator Calibration" option on CNT-91
1. Setting -> Misc -> Smart Meas -> Smart Frequency -> ON
Smart Frequency (valid only if the selected measurement function is Frequency or Period Average).
By means of continuous timestamping and regression analysis, the resolution is increased for measuring times between 0.2 s and 100 s.
2. Setting -> Misc -> Smart Meas -> Interp Calib ON
Interpolatator Calibration - By switching off the interpolator calibration, you can increase the measurement speed at the expense of accuracy.
Please see the result with and without these CNT-91's options (Smart Frequency and Interpolator Calibration)
This result is for the internal CNT-91 reference source. I will check with external reference second Morion OCXO shortly.
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