Programming The Instrument - Logitech 2000 MKIII Series User Manual

Programming the instrument

Calculated Result
The result will be calculated according to the options and values selected for the mode,
calculation, scaling factor and offset, which are described in detail below. The equation for
this will be as follows:
CALC: Frequency A mode:
MUL �� = (��
DIV �� =
A/B mode:
MUL �� =
DIV �� =
Where:
�� is the displayed value.
�� is the scaling factor for the mode.
�� is the rate (frequency) of the input signal on IPa and/or IPb.
�� is the offset for the mode.
The value �� calculated according to the equations above will be shown on the display with
each update. Where this manual refers to the scaled frequency value, it is this result that is
considered (e.g. alarm outputs, analogue output).
Choice of CALC setting
In most cases the 2000T has sufficient digits to accurately represent the scaling factor whether
it is multiplicative or reciprocal, and the calculation can be chosen based on preference.
However, in the case of very small numbers (where most of the entered digits would be zero),
greater accuracy can be obtained by inverting the scaling factor and changing the calculation
type. Flowmeter K-factors are an example of when this can be a useful approach. With the
× �� ) + ��
! ! !
#
!
+ ��
!
$
!
# × $
! !/"
+ ��
!/"
#
"
#
!
+ ��
!/"
# × $
" !/"
Frequency B mode:
�� = (�� × ��
"
#
"
�� = + ��
$
"
B/A mode:
# × $
" "/!
�� =
#
"
#
"
�� =
# × $
! "/!
6
) + ��
" "
"
+ ��
"/!
+ ��
"/!