DAD 141.1 Technical Manual, Rev. 2.5 – April 2015
Page 37 of 54
Mode 1 (FIR filter) Settings / Characteristic
FL
Settling time
to 0.1%
(ms)
3 dB
Cut-off
frequency
(Hz)
20 dB
damping at
frequency
(Hz)
40 dB
damping at
frequency
(Hz)
Damping in
the
stopband
(dB)
Stopband
(Hz)
Output rate
max.
(samples/s)
0
no filtering
**
600
1
47
19.7
48
64
>90
>80
600
2
93
9.8
24
32
>90
>40
300
3
140
6.5
16
21
>90
>26
200
4
187
4.9
12
16
>90
>20
150
5
233
3.9
10
13
>90
>16
120
6
280
3.2
8
11
>90
>13
100
7
327
2.8
7
9
>90
>11
85.7
8
373
2.5
6
8
>90
>10
75
* * Antialiasing filter 17 Hz @ 60 dB/decade
Attention:
In mode 1 the output rate is dependant on the selected filter level (FL) and will be automatically
adjusted by the DAD 141.1.
10.4.3. UR Update Rate and Averaging
[
Index 0x2120
]
Depending on the selected filter mode this command defines an averaging for the output value. The permitted
settings are from 0 to 7 (see table below
). The average value will always be calculated from
2
UR
measurement
values.
DAD 141.1 allows for the following settings:
UR
0
1
2
3
4
5
6
7
Average of 2
UR
values
1
2
4
8
16
32
64
128
Check / Setup of the averaging:
Master (PC / SPS) sends
Slave (WCN-H 122.1) responds
Meaning
UR
U+00003
Request: Averaging of 8 values
UR 7
OK
Setup: Averaging of 128 values
WP
OK
Setup saved
Factory default
: 0 (no averaging, means 600 samples/sec)
Remark to Mode 1
Dependency Output Rate - averaging UR - Filter FL
UR
Output Rate samples/s
FL0
FL1
19.7 Hz
FL2
9.8 Hz
FL3
6.5 Hz
FL4
4.9 Hz
FL5
3.9 Hz
FL6
3.2 Hz
FL7
2.8 Hz
FL8
2.5 Hz
0
600
600
300
200
150
120
100
85.7
75
1
300
300
150
100
75
60
50
42.85
37.5
2
150
150
75
50
37,5
30
25
21.42
18.75
3
75
75
37.5
25
18.75
15
12.5
10.71
9.38
4
37.5
37.5
18.75
12.5
9.38
7.5
6.25
5.36
4.69
5
18.75
18.75
9.38
6.25
4.69
3.75
3.13
2.68
2.34
6
9.38
9.38
4.69
3.13
2.34
1.88
1.56
1.34
1.17
7
4.69
4.69
2.34
1.56
1.17
0.94
0.78
0.67
0.59
