Counter Timer Frequency Ranges

[ASTDan]

Hello,

I know this info is somewhere but I am having a hard time trying to find it.

When using a Counter/timer to measure frequency there are multiple methods.

i.e. Low Frequency with 1 counter and high frequency with 2 counters.

What is the definition of a "low frequency" and what is the definition of a "high frequency"? i.e. low frequency = frequencies below 100 Hz

Also what is the definition of a "large range"?

Thanks

Dan

[gleichman]

QUOTE (ASTDan @ Nov 2 2008, 11:00 AM)

Hello,

I know this info is somewhere but I am having a hard time trying to find it.

When using a Counter/timer to measure frequency there are multiple methods.

i.e. Low Frequency with 1 counter and high frequency with 2 counters.

What is the definition of a "low frequency" and what is the definition of a "high frequency"? i.e. low frequency = frequencies below 100 Hz

Also what is the definition of a "large range"?

Thanks

Dan

How many bit is the counter and how often will you be reading it? If there is a possibility of rollover, you will need two CTRs otherwise one will suffice. But, this only matters if you need to count every pulse. (No political comments please ) If you are just measuring frequency and duty cycle this shouldn't be an issue.