MoTeC CDL3 - Manual (Page 22)

22 Installation
o
Signal conditioned three-wire pressure sensors
o
Thermocouple amplifiers
o
Accelerometers
These inputs can also be used to measure two-wire variable resistance
sensors if an external pull-up resistor is connected from the input to the
5 V sensor supply.
Additionally, on/off switch signals may be connected, which may also
require an external pull-up resistor.
Analogue Temp Inputs
Analogue Temperature inputs are identical to Analogue Voltage inputs,
except that they contain a 1000 ohm resistor which is connected internally
from the input pin to the 5 V sensor supply. This allows the Analogue
Temperature inputs to be used with two-wire variable resistance sensors,
such as:
o
Two wire thermistor temperature sensors
o
Two wire variable resistance pressure sensors
Some voltage output sensors can also be used if they can drive the 1000
ohm resistor without causing an error in their reading (e.g. MoTeC
Thermocouple Amplifier).
Additionally, on/off switch signals may be connected.
Digital Inputs
Digital inputs can be used for the external switches required to operate the
display. These inputs have a 4700 ohm resistor connected internally from
the input pin to the 5 V sensor supply so that a switch can be simply
connected between the input pin and 0 V.
They can also be connected to a brake switch or other switch.
Digital Inputs include the following measurement methods:
o
Frequency: The frequency of the input signal is measured
o
Period: The time between successive pulses is measured
o
Pulse width: The low time of the pulse is measured
o
Count: Counts the number of pulses
o
Phase Difference: Calculates the phase difference between two digital
inputs
o
Beacon: For connection of a lap beacon