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Manual C118 EN Rev04
04.2017
16
Computing (scaling) factor
One of the most fascinating facilities of the C118. It con-
verts the measured signal frequency into readings in any
required engineer unit, introducing a conversion factor, in a
multiplying or dividing way.
The multiplying mode increases the measured value (speed)
by the computing factor. A typical application is to convert
a RPM measurement into readings of the circumferential
speed of a roll: simply set the roll circumference as the
multiplying factor. It can be in meter terms, or by ft to read
m/min or ft/min, and with programmable decimals.
Set parameter of step 02 to “0” to achieve the multiply-
ing mode.
The dividing mode, for instance, may be used to get the
output speed of a gear, with the input speed being meas-
ured, and the gear step-down ratio is set as dividing factor.
Another example is to read flowrate, from a flowmeter out-
put frequency as the measured quantity. Set the flowmeter
calibration factor (pulses per gallon, for instance) as the di-
viding factor.
Set parameter of step 02 to “1” to achieve the dividing
mode.
Determining the
relation between
measurement
and reading
Step No. 02
Mode of
computing factor:
0 = multiplying
1 = dividing
Decimal point position of the computing factor
The display shows the digits by - - - - - - and a decimal
point. Move the decimal point shown to the desired posi-
tion with key . Decimal point at the extreme right means
“no decimals”.
Step No. 03
decimal point
position in factor
Computing factor numerically
Set the desired numerical value of the computing factor,
with decimals as prepared in step No. 03.
Step No. 04
computing factor
numerically
Decimals in Speed Display
In VAR mode the decimal point can be set to any desired
position, which will then be maintained for all measure-
ments in VAR mode (except of the totalizing function SF).
It also stays so, when switched to another time reference.
Use the same procedure, as explained for step No. 03.
Notes:
If the actual speed thus exceeds the maximum of 6 digits,
the reading will be blocked at 999990, with the decimal
point held as programmed.
With readings exceeding 100000, with the decimal point
wherever, the last digit is kept on zero.
Step No. 05
decimals in speed
display
Manual C118 EN Rev04
04.2017
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Notes:
Do not select more decimals than necessary! If the high
resolution thus achieved exceeds the stability of the varia-
ble, and the repeatability of the input signal, the last digits
in display and analog output necessarily will fluctuate, and
be useless.
For the totalizing function (SF) the decimal point is set in a
separate step No.10.
Analog Output
The analog output repeats the displayed values, in all
modes /sec, /min, or /h. It is not operational in the totalizing
mode SF.
High end and low end of the conversion span are separately
defined, by program steps No. 06 and 07.
The definitions refer to the numerical values only. If those
vary, because of a change in the time reference /s, /min, /h,
the output changes likewise. Consider this, when setting the
span ends.
A change in the decimal point however, will not affect the
span ends, the output sticks to the numerical value.
Analog Output
High End (4 volts) Assignment of the Analog Output
The parameter defines the displayed value assigned to the
high end 4 volts of the output, however it may be achieved,
disregarding the /s, /min, /h reference in action. But it con-
siders the decimal point in reading, to maintain the output.
For example, if 4 volts have been assigned to 250.00, it will
be 4 volts also at 250.0 or 250.
If the measurement exceeds the high end, the output limits
to approximately 4.06 volts.
Step No. 06
value assigned to
the high end
(4 volts)
Low End (0 volts) Assignment of the Analog Output
The parameter defines the display reading, which is as-
signed to 0 volt output, as a numerical value, disregarding
the /s, /min, /h, as explained for the high end.
Commonly, 000000 is selected as the assigned value, to
have the full range of the variable on the output. Setting a
higher value however, enhances the resolution within the
thus narrowed span – a very practical means to track small
variations of the variable. Do not set the low end to more
than 90 % of the selected high end (= 10 times enlarge-
ment).
Step No. 07
value assigned to
the zero end
(0 volts)
Summary of Contents for MOVIPORT C118 Series
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