I have a PM6690 and it seems to work with Prologix GPIB/USB and latest version of Timewave. I have never used the software before. I have my Thunderbolt connected as external ref and as Input A measuring Freq. inset up Timewave for a modified Allan Dev taking datapoints every second for 2 hours. After about 10-15 mins it had collected 7200 points and stop and said insufficient data points were acquired. Why did Timewave stop exactly at 7200 ? Any advice appreciated to get me on the right track Jerry Sent from my iPhone

Opps my smartphone spell corrected somehow. My question is about Timelab not timewave Sorry Jerry Sent from my iPhone > On Aug 10, 2017, at 6:52 PM, Jerry Stern <jsternmd@att.net> wrote: > > I have a PM6690 and it seems to work with Prologix GPIB/USB and latest version of Timewave. I have never used the software before. I have my Thunderbolt connected as external ref and as Input A measuring Freq. inset up Timewave for a modified Allan Dev taking datapoints every second for 2 hours. After about 10-15 mins it had collected 7200 points and stop and said insufficient data points were acquired. Why did Timewave stop exactly at 7200 ? > > Any advice appreciated to get me on the right track > > Jerry > > Sent from my iPhone