Frequency measurement with ADC11/10

Controlfreak · Post by **Controlfreak** » Mon May 21, 2007 12:37 am

We just bought a measurement system utilising an USB ADC11/10 to measure the actual frequency of a 2V squarewave (34...100Hz). The required update rate of the measured frequency value is 100ms => Sampling Interval 100ms.
The contents of the plw.ini file:
-------------------------------------------------
[General]
FirstTime=No
[Window]
Recorder=0,1,-1,-1,-1,-1,310,745,298,567

QuickSampleMs=100
-------------------------------------------------

I run WinXP Professional (continuously updated to latest SP, patches etc.) on a laptop, with PicoLog 5.15.6.
Whenever I set the sampling interval to < 1s, PicoLog records only some flickering frequency value between .90 and 1.21Hz, but not the correct values.
I tried also PicoLog 5.16.2, with the same result.
The supplier of the system says, that they were able to run the system with the specified 100ms sample interval.
I know that other people had similar problems a while ago
[http://www.picotech.com/support/about3289.html].
Can anybody help me?
Thanks

ziko · Post by **ziko** » Tue May 22, 2007 1:26 pm

Hi and thank you for your post.

This is a bug, we have reported to this to the software engineers, thank you for your input.

Kind regards