Performance Tests
Power Reference Level Test
Agilent E4418B/E4419B Service Guide 2-15
Power Reference Level Test
Description
This test verifies the power level accuracy of the internal 50 MHz
oscillator—also called the power reference oscillator. The power reference
oscillator output is factory adjusted to 1 mW ±0.4%. This accuracy
includes a performance limit of 0.1% and a system measurement
uncertainty figure of 0.3% (traceable to the National Physical Laboratory
(NPL), UK). Refer to Appendix B for the measurement uncertainty of the
system.
Note The setting of the oscillator output accuracy is determined from the
system measurement uncertainty plus any chosen test line limit.
For example, if a test line limit of 1 mW ±0.2% was chosen while
maintaining a system measurement uncertainty of ±0.3%, the overall
accuracy of the test setup for the 1 mW power output becomes
0.3% + 0.2%, giving a setting accuracy of 0.5%.
Electrical
Characteristics
Performance
Limits
Conditions
Power reference 1 mW Internal 50 MHz oscillator
factory set to ±0.4% traceable to
National Physical Laboratory
(NPL), UK.
Power reference
accuracy setting
±0.1% Guardbanded Test Line Limits.
Power reference
accuracy after
2 years
±0.5%
(23 ±3
o
C)
Worst case power meter
accuracy, taking into account
the possibility of oscillator drift
and operation at 55 degrees.
4402serv.book Page 15 Tuesday, October 14, 2003 3:18 PM
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