Teledyne LeCroy WaveExpert 100H Operators Manual - Manual (Page 213)

Wave Expert
WE-OM-E Rev A
211
leave it unchecked.
9. Touch inside the Output type field, and make a selection from the pop-up menu.
10. Touch inside the Window field, select a window type.
11. Touch inside the Algorithm field and select either Least Prime
** or Power of 2 †† from the
pop-up menu.
** The default algorithm is a least primes algorithm that computes FFTs on transform sizes having lengths that can be
expressed as factors of 2 N *5 K . This is very compatible with the record lengths encountered in the oscilloscope, which are
often multiples of 1, 2, 4, 5, or 10.
†† The other choice is a power of two algorithm where the record lengths are in the form of 2 N . The power of 2 algorithm
generally runs faster than the least primes algorithm. The price that is paid is a record length that is not the same as the
acquired signal. The power-of-two FFT uses the first 2
N points of the record. For example, if you acquire 500 points in your
trace, the power-of-two FFT would only use the first 256 points.