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2.
Zero the power sensor.
a)
Ensure that the power sensor is not connected to any signals.
b)
Zero the power sensor using the built-in function, according to the power sensor
documentation.
3.
Connect the power sensor with the SMA (m)-to-N (f) adapter attached to CH 0 of the
PXIe-5423.
Note
Ensure the power sensor is supported to the extent that excessive strain
is not applied to the connected channel of the PXIe-5423 or to the power sensor
connector.
4.
Configure the power sensor with the following settings:
•
Maximum noise ratio
: 0.005 dB
•
Auto range
: Enabled
•
Power measurement
: Continuous average
•
Path selection
: Automatic
•
Averaging
: Automatic
•
Aperture
: 20 ms
•
Timeout
: 10 s
•
Frequency
:
Frequency
Passband Flatness Accuracy Verification
5.
Configure the PXIe-5423 with the following settings:
•
Load impedance
: 50 Ω
•
Output mode
: Standard Function
•
Waveform type
: Sine
•
Amplitude
:
Amplitude range
listed in the
Passband Flatness Accuracy Verification
table
•
Frequency
:
Frequency
Passband Flatness Accuracy Verification
•
Offset
: 0 V
6.
Wait 1 second for settling.
7.
Measure and record the power (dBm) using the power sensor.
•
When the power is measured at 0.05 MHz, record this as
P
Measured at 0.05 MHz
.
•
When the power is measured at all frequencies other than 0.05 MHz, record this as
P
Measured at
Current Test Frequency
.
8.
Skip this step if the PXIe-5423 frequency is configured to 0.05 MHz. Calculate the
passband flatness error using the following formula:
Passband Flatness Error
(dB) =
P
Measured at 0.05 MHz
-
P
Measured at
Current Test Frequency
where
P
Measured at 0.05 MHz
(dBm) and
P
Measured at
Current Test Frequency
(dBm) are values for
power measured at the same amplitude range listed in the
9.
Repeat steps 4 through 8 for each configuration listed in the
10. For each configuration, compare the passband flatness error to the appropriate limit from
the
Passband Flatness Accuracy Verification
table.
PXIe-5423 Calibration Procedure
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© National Instruments Corporation
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