DI-4730 Hardware Manual
Controls, Indicators, and Connections
22
available. Choose a range that comes closest to your expected full scale rate or frequency. For example, if you need to
measure the output of a flow meter that can measure a maximum flow rate of 100 gallons per minute, and the output
frequency at that rate is 100 Hz, you would choose the 100 Hz range setting. A range setting of 200 Hz full scale sac-
rifices half of the instrument's resolution at 200 gallons per minute, and a range of 50 Hz allows measurements to
only 50 gallons per minute full scale.
Check the "Cycles/min" box to display and select frequencies reported in cycles per minute instead of cycles per sec-
ond (the measurement interval remains the same). Tachometer measurements in units of RPM (revolutions per min-
ute) is just one example that benefits from selecting this option. For example, if the 100 Hz range setting is selected
and "Cycles/min" is checked, the full scale range is actually 6000 cycles per minute.
Please Note:
To measure the maximum rate, which is defined as 2 times the Maximum Sample Rate/Channel , the cur-
rent values of Maximum Sample Rate/Channel divided by Sample Rate per Channel MUST be an integer.
W
IN
D
AQ
Counter (D3 Count)
Enable channel 11 to record Counts, or the number of falling-edge transitions that are applied to this input. The count
may be reset via W
IN
D
AQ
software or under program control as necessary. Click on
Edit
>
Channels
in the W
IN
D
AQ
