©
National Instruments Corporation
23
NI 5922 Calibration Procedure
g.
Repeat steps 10a through 10f for the next data record, and repeat
until you have calculated a result for each of the 400 data records.
11. Calculate the sum of all 400 arrays resulting from step 10. Denote this
sum as X6. X6[0] contains the sum of the first elements in each X5,
X6[1] contains the sum of the second elements in each X5, and so on.
12. For all elements of X6 (indexed from 0 to 80) calculate a new real
array X7:
The absolute value notation implies calculating the real magnitude
(or radius) of the complex number.
Compare the absolute value of each element in X7 to the value listed
in the
Calibration Test Limits
column or the
Published Specifications
column in Table 8. If the result is less than the selected test limit, the
device has passed this portion of the verification.
13. Repeat steps 1 through 12 for each iteration listed in Table 8.
14. Move the scope calibrator to the digitizer input channel 1 and repeat
steps 1 through 13, changing the values of the
channelList
and
triggerSource
parameters from
"0"
to
"1"
.
Note
The –3 dB bandwidth of the NI 5922 is set by its digital filters and does not need to
be verified.
Table 8.
NI 5922 Flatness Settings and Limits
Iteration
Range (V)
Sample Rate
(S/s)
Calibration
Test Limits
Published
Specifications
1
2
5 M
0.06 dB
0.06 dB
2
2
10 M
0.15 dB
0.15 dB
3
2
15 M
0.3 dB
0.3 dB
4
10
5 M
0.06 dB
0.06 dB
5
10
10 M
0.15 dB
0.15 dB
6
10
15 M
0.3 dB
0.3 dB
X
7
i
[ ]
20
X
6
i
[ ]
log
20
X
6 0
[ ]
log
–
=
