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Setting an Offset
The 2000T tachometer has an OFFSET facility that can be either positive or negative. It is a
very useful addition to the scaling factor and can be used to display percentage difference
between A and B, or show the deviation from a nominal value.
For example: If the nominal frequency on Input A is 1000 Hz, by setting the scaling factor to 1
and the OFFSET to -1000, the display will show the deviation from 1000 Hz.
Another use of the OFFSET is in the display of percentage difference between signal A and
signal B. One of the signals is chosen as the reference (say signal A).
The percentage difference is given by:
which simplifies to:
Thus, by setting the mode to read ratio B/A with a scaling factor of 100 and an offset of –100,
the percentage difference between A and B will be displayed.
Please note that the function of the 7
negative offset values.
Decimal Places
The decimal point position can be user set for each mode and adjusted to either increase or
reduce the number of decimal places displayed. The result will automatically be rounded to
the set number of decimal places. Alarms and other outputs will however always use the
calculated result and not the rounded display value.
The number of decimal places is altered in the settings menu (DISP DP). When doing so, it is
important to ensure that the maximum possible display value can be displayed in the
remaining digits. The display will read
with the current settings.
Update Time
The update time determines the rate at which the frequency calculation is performed and
that the display (and analogue output on "A" models) are updated. The user can select
between a number of options for this: 100ms, 250ms, 500ms, 1000ms (1s), 3000ms (3s).
Wait Time
Provided that a pulse has been detected within the configured update time, the display will
update at this configured interval as described above. The wait time determines the
".!
× 100
!
"
(
× 100 ) – 100
!
th
decade (7 DISP) must be set to sign in order to set
HIGH
when the result is larger than can be displayed
8
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