3-36
3
(AC period ) * (# of AC cycles )
measurement period
The filter settings are controlled with the MEASure:AVERage command.
e.g.
MEAS:AVER 0, 16
'sets temperature filter
MEAS:AVER 2, 33
'sets filter average number
AF 2,33
'sets filter average number
AFI
'resets filter value
TABLE 3-4 4807/4867 FILTER CALCULATIONS
Xtal Freq = 20 MHz
A/D Period = 19.7 ms
Temp Period = 79.11 ms
60 Hz Periods time-ms #A/D Samples #Temp Samples
19
.31666
16.017
4.0028
38
.6333
32.035
8.0057
76
1.2667
64.070
16.0114
50 Hz Periods time-ms #A/D Samples #Temp Samples
32
0.64
32.372
8.0900
86
1.72
87.0005
21.7418
4807 A/D filter values for 60 Hz are 16, 32, 64 etc.
4807 Temp filter values for 60 Hz are 4, 8, 16, etc.
4807 A/D filter values for 50 Hz is 87.
4807 Temp filter values for 50 Hz are 8, 16 etc.
TABLE 3-5 2307/2367 FILTER CALCULATIONS
Xtal Freq = 14.75 MHz
A/D Period = 33.6 ms
Temp Period = 33.6 ms
60 Hz Periods time-ms #A/D Samples #Temp Samples
10
0.16667
4.96031746
4.96031746
50 Hz Periods time-ms #A/D Samples #Temp Samples
42
0.84
25.00
25.00
2307 filter values for 60 Hz are 5, 10, 15 etc.
2307 filter values for 50 Hz are 25, 50 etc.
