Input Attenuator Adjustment

This adjustment applies to the following models:

There are 79 distinct settings for AT1 and AT2 in the predefined sequence nominally ranging from 0 dB to 19½ dB of attenuation in ¼ dB steps. The adjustment procedure measures the output power at each attenuator setting in the sequence relative to the output power at the nominally 0 dB attenuation setting. The change in measured power determines the amount of attenuation supplied by each attenuator setting at the measurement frequency.

Required Test Equipment

Test Equipment

Recommended Models1

Spectrum analyzer

N9030A Option 5xx2

Attenuator, 6 dB Fixed

8493C Opt. 006

50 W terminator

  • 3 required

909D

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

1250-1750

Adapter, 3.5 mm (f) to 2.4 mm (f)

11901B

Cable, 3.5 mm (m) to 3.5 mm (m)

11500E

Cable, BNC (m) to SMB (f)

8121-2063

100 MHz reference

M9300A
  1. Refer to the main Required Equipment table for a list of alternative models.

  2. Select any frequency option (503, 508, 526, 543, 544, 550)) that has a maximum frequency greater than or equal to the maximum frequency of the unit under test.

Connections and Setup Procedures

Setup for Input Attenuator Adjustment