FIGURE 20. Barnhart. Youden diagram for effective Q at terminals of standards, referenced to initial NBS value.

NOTE:

Attenuator became temperature sensitive, possibly due to having too much power applied somewhere in the audit cycle.

Hand heat alone will lower value from 10.3 decibels nominal At more elevated temperatures the attenuator room temperature value to 10.1 decibels. Data is plotted in random order. It is exhibits a turnover and rises to 10.5 decibels. impossible to know which points are before or after.

FIGURE 9. Barnhart.

Deviations from NBS values, computed by route supervisor, for fixed 10-dB coax attenuator #1.

FIGURE 22. Barnhart. Deviations for initial NBS value, computed by route supervisor, 51–62-74 GHz wavemeter.

FIGURE 23.

Barnhart.

Deviations from initial NBS value, computed by route supervisor, for thermistor mount efficiency at 10 mW, 100 MHz and 3.5 GHz.

FIGURE 14. Barnhart. Youden diagram for fixed 50-dB coax attenuators, referenced to initial NBS value.