Spider DSA User’s Manual
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The typical settings of the tachometer are listed below:
Tachometer Channel identifies the channel used as Tacho 1 (or 2). The
checkbox can be used to enable or disable the tachometer channel and the
dropdown menu lists all the channels that can be used as a tachometer channel.
For the 7.4 hardware units, any input channel from the master module can be
used as a tachometer channel. For the 7.5 hardware units, the dedicated
tachometer 1 channel is used as the Tachometer channel 1 and is enabled at all
times. The dedicated tachometer channel 2 is used as tachometer channel 2 and
the user has an option to enable it or disable it.
Pulse Edge Type specifies triggering upon the rising or falling edge of the
tachometer pulse.
Pulse per Revolution is assumed from each revolution. The tachometer may
generate one or multiple pulses per revolution of the rotating machine. The
number of tachometer pulses that need to be counted to complete one machine
revolution is set using this parameter. The minimum value of this parameter has
to be 1.
Pulse Edge Value is the threshold voltage level that the input tachometer pulse
needs to exceed to be detected as a pulse.
Acquisition Mode controls the processing of the tachometer signal.
Free Run – data is acquired regardless of the direction of the RPM as long as
the RPM is between the low and high RPM limits.
Run Up – data is only acquired when RPM starts below low RPM limit and
then increases. Acquisition stops when RPM exceeds high RPM limit.
Run Down – data is only acquired when RPM starts above high RPM limit
and then decreases. Acquisition stops when RPM exceeds low RPM limit.
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