Power Reference Level Test; Description - Agilent Technologies E4418B Service Manual

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.
The setting of the oscillator output accuracy is determined from the
Note
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%.
Agilent E4418B/E4419B Service Guide
Electrical
Characteristics
Power reference
Power reference
accuracy setting
Power reference
accuracy after
2 years
Performance
Limits
1 mW Internal 50 MHz oscillator
factory set to ±0.4% traceable to
National Physical Laboratory
(NPL), UK.
±0.1%
Guardbanded Test Line Limits.
±0.5%
Worst case power meter
(23 ±3 o
C) accuracy, taking into account
the possibility of oscillator drift
and operation at 55 degrees.
Performance Tests
Power Reference Level Test
Conditions
2-15