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.

Click here for troubleshooting.

Required Test Equipment

Test Equipment

Recommended Model Number

Microwave Signal Generator #1 and Microwave Signal Generator #2

PSG Models
(see equipment list)

Power Meter

N1914B

Microwave Power Sensor

N8485A 

Microwave Power Splitter

11667B

Hybrid Power Divider

87302C 

Microwave Power Divider

11636B 

6 dB Fixed Attenuator
(2 required)

8493C Option 006

BNC Cable
(2 required)

8120-1840 

Coaxial Cable, 3.5 mm
(2 required)

11500E

3.5 mm (f) to 3.5 mm (f) adapter 
(2 required, for 3.5 mm sources)

83059B 

BNC (m) to SMA (f) adapter

1250-1700

Type-N (m) to Type-N (m) adapter

1250-1475

Type-N (m) to BNC (f) adapter

1250-1476

Type-N (m) to 3.5 mm (m) adapter
(2 required)

1250-1743

Type-N (m) to 3.5 mm (f) adapter 
(2 required)

1250-1744

3.5 mm (m) to 3.5 mm (m) adapter
(2 required)

83059B

2.4 mm (f) to 3.5 mm (f) adapter
(2 required, for 2.4 mm sources)

11901B 

Connection Setups

In the following setups, cables are designated as solid lines and direct connections are designated as dashed lines.

Power Meter Calibration


 

Third Order Intermodulation Adjustment Setup #1

 

Third Order Intermodulation Adjustment Setup #2