Keysight 8990B Service Manual page 27

11 Zero and calibrate the DUT.
12 Measure and record the power readings for the current frequency and power
13 Turn off the RF output of the signal generator.
14 Compute the accuracy error of the DUT for each frequency being measured at
15 Repeat steps 12 to 14 for other frequencies with the same power level.
16 Compare the computed accuracy errors to the calibration uncertainty values in
17 Repeat steps 4 to 16 by sweeping through the power levels from -25 dBm to
Keysight 8990B Service Guide
level, as P (from the PC) and P
DUT
the same power level, using the following equations:
Accuracy error (dB)
Accuracy error (%)
the data sheet at
https://literature.cdn.keysight.com/litweb/pdf/5990-8126EN.pdf?id=205092.
If the verification fails, return the 8990B to Keysight.
+10 dBm. Level the power manually if necessary, with reference to the incident
sensor, using the following equation:
Test port power = P
Performance Verification and Adjustments
(from the power meter's channel B).
INC2
= P P +
(
–
DUT INC2
P
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
= 100 × anti log
+ ( P P
–
INC2 STD INC1
P P
( ) )
–
STD INC1
P + P
( )
–
DUT INC2 cpl
10
)
1
1
–
27