Third Order Intermodulation Adjustment

This adjustment applies to the following models:

This adjustment adjusts the First LO phase (in both Imaginary and Quadrature) to null the Third Order Intermodulation products. This adjustment is only performed in Band 0 from 100 MHz to 3.6 GHz in 8 MHz steps. At each TOI frequency, the I-DAC and Q-DAC are adjusted to a value that nulls the distortion product. The DAC values are then stored in memory.

This adjustment should be performed if the analyzer fails the TOI test below 3.6 GHz, or if the Front End Assembly has been changed.

For troubleshooting, click here.

Required Test Equipment

Test Equipment

Model Number1

Microwave Signal Generator #1 and
Microwave Signal Generator #2

PSG Models
(see equipment list)

Power Meter

N1914A

Microwave Power Sensor, 3.5 mm

N8485A CFT

Microwave Power Splitter, 3.5 mm

11667B 

Hybrid Power Divider

87302C

Microwave Power Divider

11636B

Fixed Attenuator, 6 dB

  • 2 required

8493C Option 006

Cable, BNC

  • 2 required

8120-1840

Cable, coaxial 3.5 mm

  • 2 required

11500E

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

  • 2 required
  • For 3.5 mm sources

83059B

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

  • 2 required
  • For 2.4 mm sources

11901B

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

1250-1743

Adapter, 3.5 mm (m) to 3.5 mm (m)

83059A

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

  • For Option 544

11901D

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

  • 8485A adapter

08485-60005
  1. Refer to the main Required Equipment table for a list of alternative models.

Connection Setups

Power Sensor Calibration

Third Order Intermodulation Adjustment Setup #1

Third Order Intermodulation Adjustment Setup #2