Power Linearity Performance Verification - Keysight Technologies U8480 Series Service Manual

2 Performance Verification and Adjustments

Power Linearity Performance Verification

The power linearity performance verification measures the relative linearity error
of the U8480 Series. All measurements are performed at 50 MHz. The reference
power level for the linearity measurement is 0 dBm for the U8481A, U8485A,
U8487A, U8488A, and U8489A.
This performance verification requires the following equipment:
– signal generator (N5182A)
– thermocouple-based average power sensor, as a reference sensor
– power meter (N1914A)
– power splitter (11667A/B/C)
– amplifier
– step attenuators (8494H and 8496H)
– attenuator/switch driver (11713B)
– computer, with the Keysight BenchVue Power Meter/Power Sensor Control &
The linearity specification is calculated with a root sum of the squares (RSS) of
NOTE
the U8480 Series linearity specification and the reference power sensor linearity
specification.
For example, at ranges -1 to 15 dBm:
The U8481A/8485A linearity specification is 0.50%.
The N8481A/N8485A reference sensor linearity specification is 0.52%.
Therefore, the linearity specification is equal to √(0.50
Refer to the datasheet for the linearity specification at different ranges.
24
(N8481/85/87/88A)
Analysis App and the Keysight IO Libraries Suite installed
2 2
+ 0.52 ) = 0.7214
Keysight U8480 Series Service Guide