1 Operation and Service Guide
32 Keysight E4412A and E4413A Operating and Service Guide
6 Record the power measured by the power meter as P
ref
for channel B and as
P
DUT
for channel A.
7 Normalize both P
ref
and P
DUT
to the power measured at 0 dBm, based on the
following equations:
8 Calculate the linearity error of the DUT for the power level using the following
equations:
9 Compare the calculated linearity error to the system specifications. If the
verification fails, refer to “Adjustments” on page 42.
10 Repeat step 6 to step 9 by sweeping through the power levels from -30 dBm to
20 dBm with the same frequency of 50 MHz.
11 For the range of 16 to 20 dBm, add a 10 dB attenuator (8491B/8493C) before
the reference sensor and repeat step 5 to step 9 once.
Zero set performance verification
This performance verification is carried out to verify that a minimal amount of
residual offset error is present after zeroing has been performed. The offset error is
caused by contamination from several sources including the noise of the DUT
itself. Zero set is the difference between the power levels indicated by the DUT,
after executing zeroing and the true zero power. Ideally, this difference should be
zero.
This performance verification requires the E4416/7A power meter.
Normalized P
ref
Measured power (P
ref
) Measured power at 0 dBm (P
ref
at 0 dBm)–=
Normalized P
DUT
Measured power (P
DUT
) Measured power at 0 dBm (P
DUT
at 0 dBm)–=
Linearity error (dB) P
DUT
[]
norm to 0 dBm
P
ref
[]
norm to 0 dBm
–=
Linearity error (%) Anti
P
DUT
[]
norm to 0 dBm
P
ref
[]
norm to 0 dBm
–
10
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log=
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