Advantech PCI-1780U handleiding
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PCI-1780UUser Manual 22
Instant (Software-Timed) Event Counting
With instant event counting, the software controls the rate and time of reading
counter value, which is thus also called software-timed event counting. Whenever the
software sends a read command, the current value of the counter is returned as
shown in Figure 3. 6.
Figure 3.6 Instant (software-timed) event counting
The advantage of instant event counting is low latency. It is typically used for reading
a single sample of counter value.
3.3.2 Frequency Measurement
In frequency measurement mode, the frequency of the counter clock signal is mea-
sured by one of the two measuring methods: Period inversion or counting number of
pulses in fixed duration.
Period Inversion
In this method, the period of the counter clock signal is first measured by an internal
high frequency clock. The frequency of the signal is then calculated by inverting the
period value. This is shown in Figure 3. 7 and by the following equation.
Figure 3.7 Frequency measurement by period inversion
Frequency
1
Period
------------------
1
InternalClockCount InternalClockPeriod
--------------------------------------------------------------------------------------------------------------------= =
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Productinformatie
| Merk | Advantech |
| Model | PCI-1780U |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 4254 MB |
