Somat eDAQlite - Page 112

Somat eDAQ lite
112
I2773-4.4 en
Mode Description
Pulse Time Period Output the pulse period in microseconds. The unsigned 32-bit counter
can measure pulse widths from 200 nanoseconds to approximately
850 seconds. Because this mode is the most efficient from a
processing point of view, consider using it for measuring the same
types of parameters as the frequency mode when the eDAQ
lite is
near its performance limit or when post test processing can perform
the calculations.
Pulse Frequency Output the instantaneous frequency of the input signal computed as
the reciprocal of the period between the last two falling edges of the
signal. Use this mode for applications including measuring vehicle
speed and engine RPM. The output data type must be 32-bit float. For
important application information, see “Pulse Frequency Mode Notes”
on page 113.
Pulse Rate Output the number of pulse counts in one sample period in units of
pulses per second (Hz). Use this mode in conjunction with the
Integrator computed channel to measure accumulated pulse counts or
other parameters that are directly proportional to accumulated pulse
counts (such as distance traveled, revolutions, etc.). The eDAQ
lite
can accumulate over 4 billion counts in each sample period; however,
the maximum pulse rate is limited to approximately 1.0 MHz.
Pulse On Time Period Output the time period in microseconds that the pulse is at logic 1. The
unsigned 32-bit counter can measure pulse on time widths from 200
nanoseconds to approximately 850 seconds. Use a Desk Calculator
computed channel (see “Desk Calculator” on page 130) to compute
duty cycle as the pulse on time period divided by the pulse time period.
Quadrature Decoder Output the encoder position in terms of the accumulated encoder
counts. The signed 32 bit counter can accumulate over 2 billion counts
in either direction before the counter rolls over.
HBM: public