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The HP 8516A is an S-parameter test set for the 8510B.
The 8516A test set has a dual port architecture, which develops a separate reference channel for each incident port. RF switching is done with a single built-in electronic switch. For active device measurements, the test sets include the ability to apply DC bias (external) to the test port center conductors. Also available are two 60 dB step attenuators, which allow control of the port 1 and port 2 signal levels.
The 8516A test set is coupler-based. Two alternate coupler configurations are available. The standard configuration is symmetrical and has identical dynamic range performance in both forward and reverse transmission measurements. The port 1 step attenuator allows reduction of the port 1 output power for forward measurements, and the port 2 attenuator allows reduction of the port 2 output power for reverse measurements.
With the Option 003 configuration, the port 2 coupler is reversed. For forward measurements, the port 2 signal is sampled directly through the main arm of the port 2 coupler. Since coupling loss is removed, dynamic range is increased in the forward direction. Since the port 2 step attenuator is inline with the port 2 sample, the power incident on port 2 may be reduced. With Option 003, up to 1 W may be input into port 2.