2.6.2 RPM TACHOMETER PROGRAMMING
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PULSES PER REVOLUTION (PPR)
The “PPr" parameter is the number of pulses given by a
complete revolution of the sensor connected to the
instrument’s input.. It is programmable from 1 to 9999.
RESOLUTION (DCP)
The "dCP" parameter allows setting the display resolution to
units (without decimal point) or to tenths (with one decimal
place).
EXAMPLE
It is desired to display the rate of a turning shaft that delivers
50 pulses per each revolution.
As the only necessary parameter, the "PPr" (pulses per
revolution) must be programmed to 50. The "dCP" parameter
should be set to the desired resolution according to the max.
reading.
With the setting of "PPr" and "dCP" the instrument should be
able to operate correctly, notwithstand, depending on sensor
characteristics, it may be necessary to adjust the internal
sampling and limit times.
After programming "dCP", a push of “ENTER” of 3s gives
access to program these parameters.
SAMPLING TIME (TIME)
With irregular input signals, the display may present fluttering
or unwanted variations due that the number of input cycles
detected at each reading are not equal.
The "TIME" parameter allows stretching the measurement
interval while making an average of the readings taken along
the programmed time. This reduces possible display jittering.
The sampling time is programmable from 0.0 to 9.9 seconds.
A value of 0.0 means that no average will be made. It is set at
the factory to 1 second.
LIMIT TIME (LIM)
The limit time, programmable from 1 to 10 seconds, is applied
in order to limitate the waiting time for at least 1 pulse is
produced at the input before considering it to be zero.
The limit time is initialized at the reception of each input pulse.
If no pulse is detected before completion of the programmed
time, the display goes to zero.
The instrument is shipped from the factory with a limit time of
10 seconds.
Decreasing the limit time makes the instrument be able to
respond more quickly to the zero condition when the system
stops but this reduction leads to an increment of the minimum
displayable reading before the display goes to zero.
