YOKOGAWA MuR10000 Manual page 23

Noise Elimination from Input Signals
IM 04P01B01-01E
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
thermoelectromotive force of the 0°C reference of T
Example when using external reference junction compensation
Recorder
Copper wire
<Related Topics> Setting the reference junction compensation function: Section 7.4
Filter and Moving 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.
• Filter (Pen Model)
The filter is a low-pass filter. The time constant can be set to 2 s, 5 s, or 10 s.
Filter result (output for a step input)
Input
2, 5, 10 s (time constant, the time it takes
to reach 63.2% of the output value)
• Moving 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.
Buffer data for the
nth sampling time
10.0 mV
1
2 5.0 mV
0.0 mV
3
4 –5.0 mV
–10.0 mV
5
Moving
0.0 mV
average
<Related Topics> Setting the filter: Sections 7.12 and 6.2
Setting the moving average: Sections 7.11 and 6.3
For the procedure to set the functions, see section 1.10, "Function Setup Guide."
°C, set the reference compensation junction voltage to the
0
°C.
0
External reference junction compensation
(Hold the contact point of the thermocouple
and copper wire at T °C)
0
Thermocouple
63.2% of the output value
Output response curve
(when using the filter)
Buffer data for the
n+1th sampling time
Most recent data
15.0 mV
10.0 mV
5.0 mV
0.0 mV
–5.0 mV
Deleted
5.0 mV
1.2 Measuring Input Section
Buffer data for the
n+2th sampling time
Most recent data
10.0 mV
15.0 mV
10.0 mV
5.0 mV
0.0 mV
Deleted
8.0 mV
1-5
1
2
3
4
5
6
7
8
9
10
11
12
App
Index