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why does my 6601 overcount?

I am using a tio 6601 board with an HP 8116A pulse generator,SCB 68 connector block, and LabVIEW 6.1.
When I enter a control pulse count, my counter overcounts by as much as 10%. Is there a reason and a fix for this?
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You might be having noise issues. You might try enabling the digital filters on the TIO. Try using the "Count Edges - Digital Filter (NI-TIO).vi" example that ships with NI-DAQ and try different filter settings. You can find the example with the example finder by searching for "digital filter".
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