Attenuator Slope Adjustment

This adjustment applies to the following models with firmware below A.09.00:

All adjustments will require the CFG Option. Refer to the CFG Option section for more information.

The SA calibration consists of five different adjustments that should be performed in succession in the following order. For more information, click here.Closed

  1. LO Feedthru

  2. Absolute Amplitude

  3. Frequency Response

  4. Attenuator Slope

  5. IF Frequency Response

Total absolute amplitude accuracy is specified with 10 dB attenuation, and Preamp off. The Fieldfox frequency response corrections are generated with 10 dB attenuation (Preamp off). The 10 dB attenuator setting is called the reference setting. Amplitude accuracy is not specified in the non-reference attenuator settings. Even though the non-reference amplitude accuracy is not specified, the amplitude accuracy should be suitable for use. The Attenuator Slope adjustment allows the Fieldfox to have excellent amplitude accuracy in the non-reference attenuator settings. This adjustment generates (and stores) amplitude corrections relative to the 10 dB attenuator setting. An attenuator slope failure may indicate that the input attenuator may have a damaged section.

Related test:

Attenuator Slope Verification (Utility)

Required Test Equipment

Test Equipment

Recommended Model Number
(see main equipment list for alternative models)

Signal Generator #1

E8257D with options:

  • 550
  • 1E1
  • 1EA or 1EU

  • UNR or UNX or UNY

Power Meter

N1914A

Power Sensor

E9304A Opt H20

Power Sensor

Closed(for models ≥ 18 GHz)

N8485A

Power Splitter

11667B

Power Sensor Cable

11730A

BNC Cable

8120-2582

Coaxial Cable

11500E

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

1250-1743

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

  • for 3.5 mm PSG

83059B

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

  • for 2.4 mm PSG

11901B

 

Connection Setups

The following notes apply to illustrations in the FieldFox Help:

  • Only a single representative model will be shown.
  • Some illustrations may differ than those in TME.

  • For procedures that apply to multiple ports, illustrations will show the setup on only one test port.

Power Meter Calibration

Attenuator Slope Adjustment Setup