Averaging Time T And Measuring Time T - Roland R1000 Series Manual

Operation
8.3 Averaging time t
Averaging time t
Every measuring program allows to choose a time for averaging. This time is the averaging time t
Possible options for averaging are 8ms, 15ms, 25ms, 50ms 100ms, 250ms.
See also chapter 7.7 „Start-up", „Program parameter 7".
Measuring time t
The measuring time t
outputting of the output signal.
Messung Start
Measurement Start
Ausgangssignal
Output signal
Fig. 85.: Clarification of the measuring time
The measurement time t
averaging and an additional delay time of 5 ms for reading the measurement. When operating via
fieldbus the additional delay is 4 ms.
8.3.1 Maximal allowed transport velocity at Double Sheet Control
The maximum allowed transport velocity of the sheet depends on the sheet length and the selected
time t for averaging. In addition, 4 ms are needed for internal processing.
a
At an upper threshold "up" = 120% (see program parameters) following empiric formula applies:
Max. allowed transport velocity [m/s] <
8.3.2 Measuring at standstill
Please notice when performing measurements at standstill:
• The minimum retention period is as long as the measurement time (the selected averaging
time).
• Punctual sheet elevations and contamination, such as dust, leads to wrong measurement
results.
98
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Double Sheet Control System R1000 series L20
with integrated fieldbus interface
and Measuring time t
a
a
Note Basically: A longer time leads because of averaging to more
accurate measuring values.
The selection of the averaging time has influence on the maximal
velocity of the sheets.
m
is the time required by the system from "measurement start" to the
m
t
m
is derived from the sum when operating via I/O inputs: the set time ta for
m
Manual
m
Length of sheet [mm]
ta [ms] + 4ms
B0063191 / 1.3
.
a