Keysight Technologies U8480 Series Service Manual page 26

2 Performance Verification and Adjustments
5 Start tuning the signal generator and/or attenuator/switch driver (optional)
Do not exceed the maximum input power (27 dBm) of the power splitter to
CAUTION
avoid damage to the power splitter.
6 Record the power measured by the power meter as P
7 Normalize both P
Normalization
= Measured Power (P
8 Calculate the linearity error of the DUT for the power level using the following
Linearity error (%) =
9 Compare the calculated linearity error to the root sum of the squares (RSS) of
10 Repeat steps 6 to 9 by sweeping through the power levels from –1 dBm to
11 For the range of 16 to 20 dBm, add a 10 dB attenuator (8491B/8493C) before
26
until the DUT measures the power level as close as 0 dBm. Record the values
as P and P
DUT at 0 dBm
measured via the BenchVue Power Meter/Power Sensor Control & Analysis
App as P .
DUT
ref
following equation:
DUT/ref
equation:
Linearity error (dB) = [P
Anti log
the U8480 series linearity specification and the reference power sensor
linearity specification in the datasheet. If the verification fails, refer to
"Adjustments" on page 31.
20 dBm with the same frequency of 50 MHz.
the reference sensor and repeat step 5 once. This is to ensure that the linearity
specification of the reference sensor is within the range of –1 to <15 dBm
instead of 15 to 20 dBm.
.
ref at 0 dBm
and P to the power measured at 0 dBm, based on the
DUT
) – Measured Power at 0 dBm (P
]
DUT norm to 0 dBm
[ ]
P

DUT
norm to 0 dBm
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

and the DUT power
ref
DUT/ref at 0 dBm
– [P ]
ref norm to 0 dBm
[ ]
P
–
ref
norm to 0 dBm
10
Keysight U8480 Series Service Guide
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