Yokogawa µR20000 - Manual (Page 21)

1-5
IM 04P02B01-01E
Funct
onal
Explanat
on
and
Setup
Gu
de
For the procedure to set the functions, see section 1.10, “Function Setup Guide.”
1.2 Measurng Input Secton
1
2
3
4
5
6
7
8
9
10
11
12
App
Index
Note
When using external reference junction compensation, set an appropriate reference junction
compensation voltage. For example, if the reference junction temperature of the external
reference compensation is T
0
°C, set the reference compensation junction voltage to the
thermoelectromotive force of the 0°C reference of T
0
°C.
External reference junction compensation
(Hold the contact point of the thermocouple
and copper wire at T 0 °C)
Thermocouple
Copper wire
Recorder
2
4 1
3
Setting the reference junction compensation function: Section 7.4
Nose Elmnaton from Input Sgnals
Flter and Movng Average
This function used to suppress the effects of noise that is riding on the signal. The pen
model and dot model are equipped with a filter function and a moving average function,
respectively. The function can be set for each measurement channel. However, it does
not operate on channels set to ON/OFF input.
• Flter (Pen Model)
The filter is a low-pass filter. The time constant can be set to 2 s, 5 s, or 10 s.
63.2% of the output value
2, 5, 10 s (time constant, the time it takes
to reach 63.2% of the output value)
Output response curve
(when using the filter)
Input
Filter result (output for a step input)
• Movng Average (Dot Model)
The average value of the m most recent values acquired at the scan interval is used
as the measured value of the channel. The number of moving-averaged data points
(m) can be set in the range 2 to 16. The figure below shows an example indicating
the operation of the buffer for the moving average computation when the number of
moving averaged data points is set to 5.
1
2
3
4
5 10.0 mV
5.0 mV
0.0 mV
–5.0 mV
–10.0 mV
0.0 mV
15.0 mV
10.0 mV
5.0 mV
0.0 mV
–5.0 mV
5.0 mV
10.0 mV
15.0 mV
10.0 mV
5.0 mV
0.0 mV
8.0 mV
Deleted Deleted
Moving
average
Most recent data Most recent data
Buffer data for the
nth sampling time
Buffer data for the
n+1th sampling time
Buffer data for the
n+2th sampling time
Setting the filter: Sections 7.12 and 6.2
Setting the moving average: Sections 7.11 and 6.3