Specifications

Second LO Power Adjustment

Agilent Technologies

PSA Series Spectrum Analyzers

Test and Adjustment Software

Second LO Power Adjustment

The 3.6 GHz 2

LO Power is measured with a power meter at the A20 Lowband 2

Test Port, A20J6. The power is controlled by a DAC on the A13 Front End Driver. The

computer reads the power and adjusts the DAC for the proper level. The instrument cover

and top shield must be removed to access the LO Test Port, but it is not necessary to put

PC assemblies on extenders.

The instrument internally reads the power level with a detector and ADC. This is done to

keep the power level constant with changing temperature. The adjustment stores a value in

the FE Driver EEROM used to calibrate the ADC so that the value corresponds to the

proper power level. The 2

LO Power needs to be adjusted from a conservatively low

level, and then gradually increased to the proper level in order to avoid saturating the 2

LO amplifiers.

This adjustment should be performed after replacing the A20 and/or A13 assemblies.

Required Test Equipment

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