Verifying RMS Noise
Follow this procedure to verify the RMS noise of the PXIe-5164 using a 50 Ω terminator.
Table 9. RMS Noise Verification
Config
Input Impedance
(
Ω)
Vertical Range
(V
pk-pk
)
Test Limit
(% of FS)
Measurement
Uncertainty (% of FS)
1
50
0.25 V
0.045
±188E-6
2
50
0.5 V
0.040
±163E-6
3
50
1 V
0.035
±144E-6
4
50
2.5 V
0.030
±127E-6
5
50
5 V
0.030
±124E-6
6
1 M
0.25 V
0.110
±2.64E-3
7
1 M
0.5 V
0.060
±1.24E-3
8
1 M
1 V
0.050
±712E-6
9
1 M
2.5 V
0.100
±1.97E-3
10
1 M
5 V
0.060
±723E-6
11
1 M
10 V
0.050
±327E-6
12
1 M
25 V
0.080
±620E-6
13
1 M
50 V
0.060
±377E-6
14
1 M
100 V
0.050
±272E-6
1.
Connect the 50 Ω BNC terminator (m) to channel 0 of the PXIe-5164.
2.
Configure the PXIe-5164 with the following settings:
•
Input impedance: the Input Impedance value from the
table
•
Maximum input frequency: (50 Ω) 400 MHz, (1 MΩ) 300 MHz
•
Vertical offset: 0 V
•
Vertical range: the Vertical Range value from the
•
Sample rate: 1 GS/s
•
Minimum number of points: 1,048,576 samples
3.
Use the PXIe-5164 to acquire a waveform, then calculate the standard deviation of the
acquired waveform. Use the standard deviation to compute the RMS noise using the
following formula:
RMS noise (% of FS)
= (100 ×
σ
)/
Vertical range
where
σ
is the standard deviation of the acquired waveform.
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PXIe-5164 Calibration Procedure
