Power Reference Level Test; Description - Agilent Technologies E4416A Service Manual

2 Performance Tests

Power Reference Level Test

Electrical
Characteristics
Power reference
Power reference
accuracy setting
Power reference
accuracy after 2 years

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
The setting of the oscillator output accuracy is determined from the system
N O TE
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%.
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.
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Performance Limits
(maximum)
1 mW
±0.1%
±0.9% (0 to 55 ºC)
for the measurement uncertainty of the system.
Conditions
Internal 50 MHz oscillator factory set to ±0.4%
traceable to National Physical Laboratory
(NPL), UK.
Guardbanded Test Line Limits.
Worst case power meter accuracy, taking into
account the possibility of oscillator drift and
operation at 55 º.
E4416A/E4417A Power Meters Service Guide