13
Manual C118 EN Rev04
04.2017
12
No reliable measurement can be expected unless the input
signal is clearly accepted!
Note:
The input indicator may still be operational with the power
supply no longer adequate.
The
indispensable
pre-condition
to reliable
measurements
MAX/MIN/AVG Function
The C118 detects and memorizes the highest (MAX) and
the lowest (MIN) measurement within a controlled period
of time. From those, it further computes the average (AVG)
of all measurements.
Begin and end of this evaluation period is controlled, under
continued measurement, by the BEGIN/END key. First ac-
tuation start memorizing, next one stops it. Display
FUNC/RUN indicates the function as being active. Once it
has been terminated (power left on), the results can be re-
called to display by the key MAX/MIN/AVG. Power OFF
switching cancels the memorized values.
Note: Do not change the measuring mode or other terms
during the evaluating period.
MAX/MIN/AVG
memorizing
Time Base of Readings
The facility of the C118 converts the originally measured
signal frequency into readings with a corresponding time
base, as indicated at the display. Select desired time base by
the key marked /h /min /sec /SF. The conversion has no in-
fluence to the measuring sequence, nor to the updating se-
quence of the display.
Totalizing
SF evokes a totalizing function within the instrument. It is
started and stopped by the BEGIN/END key, as described
above. Starting simultaneously cancels the previous result.
In FIX mode, the display reads the incoming signal pulses,
reduced by the input pre-divider as programmed by P09.
In VAR mode, they are further scaled by the computing
factor, as programmed in steps No. 02 … 04. The pro-
grammed mode, multiplying or dividing, and the factor, re-
sult in correspondingly enlarged or reduced reading steps
per input pulse. If the corresponding reading step thus re-
sults in a fraction, a decimal point in display can be set by
program step P10.
The totalizer capacity is up to 99999. Overflow will cause
errors.
The analog output cannot be used in this SF mode.
Time base of
speed readings
/h
/min
/sec
SF = totalizing
function
Manual C118 EN Rev04
04.2017
13
Operating Modes FIX and VAR
This is one of the facilities making the C118 that much
useful. Select between both modes by actuating the
FIX/VAR key. VAR mode is indicated by a sign in the
display. Programmed parameters will not be deleted when
switching to FIX.
FIX = straight
tachometer
VAR = using the
computing
facilities
FIX mode
Measuring the rotational speed, with these firm characteris-
tics:
Calibrated to 1 pulse per revolution. Minimum measuring
time = 1 sec. Low end = 30 pulses / min.
Readings in terms of /sec, or /min (RPM), or /hour, as se-
lected by this key.
FIX mode uses a floating decimal point:
Starting with one decimal at low speed. With measurements
above 10000.0, the last digit is kept on zero, to avoid flick-
ering readings. The decimal point is cancelled when the
measurement exceeds 99999.0.
Note: The thus achieved decimal selection will be main-
tained with decreasing measurements. Return to the initial
decimals sequence by switching the instrument off/on.
Totalizing (SF) may be used, counting the input pulses, not
scaled, but reduced by the preset input pre-divider.
Further effective the MAX/MIN/AVG memory. Also the
analog output, using the characteristics, as programmed.
FIX
characteristics
VAR mode
This mode activates all the capabilities included into the
MOVIPORT C118, by programmable parameters, as de-
scribed in the subsequent chapters.
Programming can be done at any time, and in any mode.
The thus defined functions become effective in the VAR
mode only.
Note:
This feature assigns two readings to one measurement, se-
lected just by switching between FIX and VAR. For in-
stance, the rotational speed by FIX, and the circumferential
speed by VAR as computed from its circumference. Or, the
measured input speed of a gear in FIX, and the output speed
in VAR, as computed from its turn down ratio.
VAR
mode facilities
Programming
procedure and
parameters list
on page 14
Two readings
utilizing one
measurement
Содержание MOVIPORT C118 Series
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