Synthesizer Output ALC Adjustment

(M9393A)

The goal of this adjustment is to characterize the performance of the ALC diodes and DAC to provide fixed DAC values for 0.3 dB steps of output power adjustment. While the circuit is referred to as ALC, there is not active feedback provided to the circuit. Calibration provides fixed DAC values for fine power level adjustment.

Required Test Equipment

Test Equipment

Recommended Models1

Power meter

N1914A2

Power sensor

E9300A Opt. H25

Adapter, Type-N (f) to 3.5 mm (m)

1250-1750

Frequency reference module

M9300A
  1. Refer to the main required equipment list for alternative models.
  2. N1914A power meters with serial number prior to MY53040007 require Service Note N1914A-07 which fixes a power supply ground loop. The ground loop injects noise into the measurement circuits which can cause unstable measurements at low (-30 dBm) power levels.

Connection and Setup Procedures

Setup for Power Meter Calibration

Setup for Synthesizer Adjustment