Measurement Computing eZ-TOMAS version 7.1.x User Manual
Page 36
eZ-TOMAS & eZ-TOMAS Remote
887591
Edit Menu 3-10
Tachometer Notes
To Assign a
Tachometer to a
Channel
1.
Navigate in eZ-TOMAS as follows: Edit [pull-down men] \ Configuration \
Input Channels Tab \ Tach Reference column.
2.
Click in the Tach Reference column and select the desired tachometer from
the pull-down list.
To Edit a
Tachometer
Channel’s
Parameters
1.
Navigate in eZ-TOMAS as follows: Edit [pull-down menu] \ Configuration \
Input Channels tab.
2.
Edit the parameters on a column by column basis, as desired. Note that there
are two places from which you can edit tachometer parameters:
(a) The main area of the Input Channels tab. This is where, for a Tachometer
type, you can edit the tachometer channel’s name, minimum and maximum
gauge values, units, etc.
(b) The lower panel of the Input Channels tab. From here you can configure
the tachometer channel’s rotation (CW or CCW), trigger/revolution, trigger
direction (POS or NEG), and trigger voltage.
For applicable illustrations of the channel configuration areas, refer to the
preceding two figures.
To obtain
optimal noise
rejection
1.
Setup the input for Voltage Mode.
2.
Take a measurement.
3.
View the Tach Signal on a TimeWaveform plot.
4.
Set the Trigger Slope [Trig Slope] to Positive (POS) or Negative (NEG).
Using Analog
Input as a Tach
1.
If you connect a tachometer sensor to an analog signal input channel (CH1
through CH8) [instead of to a dedicated tach channel], the tachometer modes
will not be applicable to that channel.
2.
Tach calculations [using an analog input] automatically remove offset. For
this reason you must specify the tach trigger voltage [for the tach channel] as
though the channel was AC coupled.
3.
Though offset is automatically removed, it can be displayed using DC
coupling.
4.
The gauge max value [for an analog channel used as a tach] is used to ignore
spurious tach pulses, i.e., anything above the gauge max value. For this
reason care must be taken to set the max gauge value correctly when any
analog channel is used as a tach.