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3.7 Digital Active Sensors miniDaqu — Manual
C
1
2
1
-
+ BAT
V
GND 3
+5 V 4
AUX
Not used
5
6
F
1
F
2
FUEL
P
E
2
7 FL
2
GND 8
E
1
9 FL
1
Y
1
10 ROTOR
GND
+12 V 11
12
R
Figure 8: An example of potentiometer, connected as variable resistor to a F
channel.
C
1
2 1
-
+ BAT
V
GND 3
+5 V 4
AUX 5
6
F
1
F
2
FUEL
P
E
2
7 FL
2
GND 8
E
1
9 FL
1
Y
1
10 ROTOR
GND
+12 V 11
12
R
Figure 9: An example of potentiometer, connected as variable voltage divider.
3.7 Digital Active Sensors
Digital active sensors require external power to operate. They produce a step
like signal, which can be viewed at as pulses. Daqu measures time between
these pulses. Such sensors are used for measuring rotor RPM and fuel flow.
Digital pulses are typically accompanied with a pulse divider value. This value
tell how many pulses are needed for one event. The value varies in regards to
the sensor type and intended function. For RPM measurements, the divider
equals to number of digital pulses for one revolution. In the case of fuel flow,
the divider equals to number of pulses required per one litre.
The pulse sensors are typically of two types NPN or PNP.
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