Attenuator Slope Adjustment

This adjustment applies to the following models:

The attenuator slope adjustment is a rough flatness adjustment for attenuator settings other than 10 dB. The flatness adjustment is performed in 10 dB attenuation only. This adjustment is performed at various frequencies for each attenuator setting in DC-Coupled mode, and at 10 dB of attenuation in AC-Coupled mode for models that allow AC-Coupled mode.

The Total Flatness Correction for any RF Attenuator setting are managed as follows:

Total Flatness Correction = Reference Flatness Correction (generated with 10 dB attenuation) + Attenuator Slope Correction (relative to 10 dB Attenuation) + AC Coupling Correction (if AC Coupling is set)

This calibration should only be performed after replacing the RF attenuators or the front end assembly.

Related utility: Attenuator Slope Check Utility

Required Test Equipment

Test Equipment

Model Number1

Microwave Signal Generator

PSG Models
(see equipment list)

Power Meter

N1914A

Microwave Power Sensor

  • 2 required
  • For Options < 544

N8485A CFT

Microwave Power Splitter

  • For Options < 544

11667B 

Millimeter Power Sensor

  • 2 required
  • For Option 544

N8487A CFT

Millimeter Power Splitter

  • For Option 544

11667C

Cable, BNC

8120-1840 

Cable, coaxial 3.5 mm

  • For Options < 544

11500E

Cable, coaxial 2.4 mm

  • For Option 544

8120-6164

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

  • For Options < 544

1250-1743

Adapter, Type-N (m) to 2.4 mm (m)

  • For Option 544

11903A

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

  • Required with Options < 544 when using a 3.5 mm source

83059B

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

  • Required with Options < 544 when using a 2.4 mm source

11901B

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

  • 8485A adapter

08485-60005

Adapter, 2.4 mm (f) to Type-N (m)

  • 8487A adapter

08487-60001
  1. Refer to the main Required Equipment table for a list of alternative models.

Connection Setups

Power Meter Calibration

Splitter Characterization

Attenuator Slope Adjustment Setup (RF Input 2)

Attenuator Slope Adjustment Setup (RF Input)