vfc()

vfc( counter_id, timer_id, sample_time)
The counter is cleared, the timer opens the gate for sample_time seconds and the counter contents is returned.
e.g.:
signal = [vfc(c1,t1,0.1)]
* = signal

vfcp( counter_id, timer_id, counts, time_max)
The counter is cleared, the preset timer is loaded with counts, the counter contents is returned after the external clock decremented counts to 0. The maximum wait-time is time_max.

vfc_bw4( counter_id, timer_id, sample_time)
The timer opens the gate for 0.01 seconds, the counter is cleared, the timer opens the gate for sample_time seconds and the counter contents is returned.
e.g.:
* = [vfc_bw4(c1,t1,0.1)]