Agilent Technologies e4418b, e4419b manual Power Reference Level Test

Performance Tests

Power Reference Level Test

If an equivalent measurement system is employed for post-factory test, 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. This specification includes the ±0.4% setting and also takes into account other factors that will contribute to determining the accuracy after 2 years. The complete breakdown of the ±0.5% specification is as follows:

•Test line limit: 0.1%.

•System uncertainty: 0.3%.

•2 year oscillator drift: 0.04%.

•Delta environment: <0.06%.

The same equipment used to measure the accuracy of the power reference oscillator can also be used to set it to the post-factory accuracy of ±0.4% (for further information refer to chapter 3, Adjustments).

The following procedure ensures maximum accuracy in measuring power reference oscillator output using Agilent test instruments of known capability. Signal acquisition criteria may vary if alternative test instruments are used. In such cases refer to the manufacturer’s guidelines for further information.

The test is performed using Equation 2-4:

Equation 2-4: Power Level Provided By The Reference Oscillator

2Vcomp(V1 – V0) + V02 – V12

P = ----------------------------------------------------------------------------------

meas 4R(CalibrationFactor)

The components of this equation are defined as follows:

•V0 is the voltage measured between Vcomp and VRF with no power applied and after the Agilent 432A has been zeroed.

•V1 is the voltage measured between Vcomp and VRF with power applied. This power is approximately 1 mW.

•Vcomp is the voltage between the Agilent 432A Vcomp connector and chassis ground with power applied.

•R is the resistance of the mount resistor in the Agilent 432A power meter. For further information refer to Appendix A.

•Calibration Factor is the value of the thermistor mount at 50 MHz

2-16 Agilent E4418B/E4419B Service Guide