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Fig.10.3.1 shows the original signal before the change-rate limit is processed. No.1 to No.4 are varying
within a small width; however, only signals No.5 and No.6 are varying in excess of 0.5%TS deviation
from the immediately preceding signal No.4. No.7 to No.10 are back to a small width of variation.
In the event that the above-set change-rate limit is applied to such signals, the output signals are as
shown in Fig.10.3.2. Since signals No.5 and No.6 are varying in excess of 0.5%TS with regard to signal
No.4, signal No.4 is output instead with regard to No.5 and No.6. Signal No.7 is output without
modification. Signals No.8 to No.10, which are also within the variation width of 0.5%TS with regard to
the respective immediately preceding signals, are output without modification.
3.0
2.5
2.0
1.5
1.0
0.5
0.0
1
2
3
4
Signal No.
Fig.10.3.3 Original Signal
Fig.10.3.3 shows the original signal before the change-rate limit is processed. The numeric values along
the horizontal axis refer to the signal numbers. No.1 to No.4 are varying within a small width; however,
signal No.5 is varying in excess of 0.5%TS with No.6 to No.10 remaining in a state not very different
from No.5.
In the event that the above-set change-rate limit is applied to such signals, the output signals are as
shown in Fig.10.3.4. Since signals No.5 and No.6 are varying in excess of 0.5%TS with regard to signal
No.4, signal No.4 is output instead with regard to No.5 and No.6.
Signals No.7 to No.10, which are within the variation width of 0.5%TS with regard to the respective
immediately preceding signals, are output without modification.
10.3.3
Cautions in using the change-rate limit factor
(1) Setting the change-rate limit width
The value can be set within the range of 0.00%TS to 9.99%TS. If the width is set to as little a
value as the normally indicated deflection width, restricted signals will increase and indications
will vary in the shape of steps. Therefore, set a sufficiently large value so that the variation width
is reliably judged to be in error.
(2) Setting the times of change-rate limit
Signals that are made faulty due to intrusion of large bubbles, etc. may affect two neighboring
signals in relation to measurement timing. Therefore, although the change-rate limit has an effect
even when it is applied only once, it is desirable to set the times of change-rate limit at least to two
times in order to reliably exclude error signals. In the event of density variations in the shape of
Example 2: Signal change in the shape of steps
5
6
7
8
9
10
84
3.0
2.5
2.0
1.5
1.0
0.5
0.0
1
2
3
4
Signal No.
Fig.10.3.4 Output Signal After Variation Factor
Restriction
6 F 8 A 0 7 8 7
5
6
7
8
9
10
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