fN1

Determines the lowest frequency that will be eliminated or notched out by the sinc filter. This filter notches out frequencies at integer multiples of fN1 by averaging for a time equal to 1/fN1; thus, lower fN1 frequencies result in longer measurement times. Set fN1 to the lowest frequency that should be filtered out. For example, setting fN1 to 60 filters all multiples of 60 and above (60, 120, 180, etc.) but will not effectively filter lower frequencies; for example 30 Hz. Any value between 5 Hz and 93.75 kHz can be entered, but common options for filtering noise are: Any value between 0.5 Hz and 31.25 kHz can be entered, but common options for filtering noise are:

Option Description
50 Standard measurement speed; requires 50 msec to filter 50 Hz noise
60 Standard measurement speed; requires 50 msec to filter 60 Hz noise
400 Medium measurement speed; performs a 6.25 msec integration to filter 400 Hz noise
4000  Fast measurement speed; performs a 0.5 msec integration to filter 4000 Hz noise
Option Description
15000 Performs a 0.0667 millisecond integration (for fast measurements)
60 (or _60Hz) Performs a 16.67 millisecond integration (filters 60 Hz noise)
50 (or _50Hz) Performs a 20 millisecond integration (filters 50 Hz noise)

Type: Constant