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5 Set the frequency of the signal source to 50 MHz and power level to
6 Set the frequency of the N1912A channels A and B to the same frequency as
7 Measure the standard power (P
8 Repeat steps 5 to 7 for other frequencies with the same power level.
9 Turn off the RF output of the signal source.
10 Remove the standard sensor from the N1912A channel A.
11 Replace it with the U2020 X-Series, which is the device-under-test (DUT).
12 Zero and calibrate the DUT.
13 Repeat steps 5 and 6.
14 Measure and record the power readings of channels A and B for the current
15 Repeat steps 13 and 14 for other frequencies with the same power level.
16 Turn off the RF output of the signal source.
17 Compute the accuracy error of the DUT for each frequency being measured at
18 Compare the computed accuracy errors to the calibration uncertainty values in
19 Repeat steps 5 to 18 by sweeping through the power levels from
Keysight U2020 X-Series Service Guide
0 dBm. Turn on the RF output.
the signal source.
channel B. Compute and record the power ratio (P
the current frequency and power level, based on the following equation:
P
(dB) = P
– P
ratio
STD
frequency and power level, as P
the same power level, using the following equations:
Accuracy error (dB) = P
Accuracy error (%) =
the table on the following page. If the verification fails, refer to
on page 36.
–25 dBm to 10 dBm with a frequency of 50 MHz.
Performance Verification and Adjustments
) of channel A and incident power (P
STD
INC1
(for channel A) and P
DUT
– (P
+ (P
DUT
INC2
STD
P
P
(
–
DUT
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Anti
log
) of these channels for
ratio
INC2
– P
))
INC1
+
P
P
(
–
INC2
STD
INC1
10
2
) of
INC1
(for channel B).
)
)
×
–
1
100
"Adjustments"
23
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