Specifications

Custom test set configurations

The Agilent 85110 test set provides the greatest

flexibility for the testing of high-power amplifiers

which often require custom test set configurations.

The 85110 test set is an open architecture which

allows amplifiers to be added to the RF path of

the test set. External test set components (ampli-

fiers, couplers, isolators, attenuators, etc.) can be

specially selected to provide the necessary power

handling capability.

For example, if the required input power for the

AUT is greater than the standard 8510C test set

can provide, the 85110 test set allows the addition

of an amplifier to properly drive the AUT. High-

power couplers and attenuators are required to

prevent over-driving the reference and test samplers.

Special test set configurations

Special 8510 test set configurations for high-power

testing are available on a request basis. An exam-

ple of a special 85110 configuration is shown in

Figure 15. This modified RF block diagram allows

up to 500 watts (CW) of high-power handling capa-

bility and also provides the ability to connect addi-

tional test equipment to the AUT via a single RF

connection.

High-power directional couplers replace the stan-

dard directional couplers in the 85110. A pair of

high-power step attenuators are added before the

test samplers (A and B) to prevent them from

being overdriven by the AUT. For some amplifier

measurements, throughput is a major concern due

to the multiplicity of tests that are required. It is

desirable to make as many measurements as possi-

ble at one test station with a single connection to

the device to reduce lengthy setup time. The front

panel port 1 and port 2 jumpers also allow the

addition of other test equipment (power meter,

spectrum analyzer, noise figure meter, etc.) for a

single connection multiple measurement solution.

Appendix A—High-power measurements