2Performance Tests
36 E4416A/E4417A Power Meters Service Guide
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 C for the measurement uncertainty of the system.
If an equivalent measurement system is employed for post- factory test (with
ambient temperature of 23 ±3 °C), the power reference oscillator output can
again be set to 1 mW ±0.4%. This setting is sufficient to ensure that the power
reference oscillator meets the accuracy specification of ±0.5% after 2 years.
Electrical
Characteristics
Performance Limits
(maximum)
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
±0.9% (0 to 55 ºC) Worst case power meter accuracy, taking into
account the possibility of oscillator drift and
operation at 55 º.
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%.
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