17. Connect the DMM and function generator to channel 7 of the NI 5170R as shown in the
AC Verification Test Connections
figure and repeat steps 2 through 9 for each
configuration listed in the
AC Amplitude Accuracy Verification
table.
Verifying Flatness and Bandwidth
Follow this procedure to verify the analog flatness and bandwidth accuracy of the NI 5170R
by generating a sine wave and comparing the amplitude measured by the NI 5170R to the
amplitude measured by the power sensor.
Before performing this procedure, complete the
Test System Characterization
procedures and
calculate the
splitter imbalance
of your power splitter.
Table 6.
Flatness and Bandwidth Verification
Config Bandwidth Vertical
Range
(V
pk-pk
)
Test Point
As-
Found
Limit
(dB)
As-
Left
Limit
(dB)
Measurement
Uncertainty
(dB)
4
Frequency
5
(MHz)
Amplitude
(dBm)
1
Full
Bandwidth
1
0.05
7.5
—
—
—
2
Full
Bandwidth
1
50.1
7.5
±0.50
±0.32
±0.12
3
Full
Bandwidth
1
90.1
7.5
-1.00
to 0.50
-0.63
to
0.25
±0.14
4
Full
Bandwidth
1
100.1
7.5
-3.00
to 0.50
-2.63
to
0.13
±0.14
1.
Connect splitter output 2 of the power sensor assembly from the
Test System
Characterization
section to channel 0 of the NI 5170R.
Note
The power sensor assembly must match the configuration used in the
Test System Characterization
section, in which the power sensor is connected to
splitter output 1 and the signal generator is connected to the input port of the
power splitter.
4
Measurement uncertainty is based on the following equipment and conditions:
•
Rohde & Schwarz Z91 configured with automatic path selection, a transition setting of 0 dB,
a 20 ms aperture, and 32 averages.
•
Harmonics from the signal generator are less than -30 dBc
•
Aeroflex/Weinschel 1593 Resistive Power Splitter
•
Fairview Microwave SMA Adapter (M-M) SM4960
•
Cable from power splitter to signal generator is 1 meter or less
5
The 0.05 MHz test point is used to normalize the remaining test points.
18
|
ni.com
|
NI PXIe-5170R Calibration Procedure
