Freq Resp above 3.6 GHz, Preamp Off Adjustment

This adjustment applies to the following models:

This adjustment is run on Options 508, 526, and 544.

This adjustment is performed in two steps. The first step determines the frequencies which the frequency response will be adjusted (this step is called adaptive flatness). The second step determines the DUT frequency response correction at the frequencies determined in step 1.

The Adaptive flatness routine plots out the uncorrected frequency response on the DUT trace. This is done by placing the DUT trace in max hold then sweeping a source through the frequency band of interest. The trace can be seen as plot of conversion loss versus frequency. The trace data is then extracted from the DUT and processed.

At each correction frequency, the DUT's conversion loss is measured. The loss is normalized to the loss at 4800 MHz and this number is placed in the DUT memory. The DUT measurement application uses these stored corrections to make accurate amplitude measurements.

The related performance test for this adjustment is Frequency Response Above 3.6 GHz (Preamp Off).

Required Test Equipment

Test Equipment

Model Number1

Microwave Signal Generator #1

PSG Models
(see equipment list)

Power Meter

N1914A

Microwave Power Sensor

  • 2 required
  • For Options 508 and 526

N8485A CFT

Microwave Power Splitter

  • For Options 508 and 526

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 508 and 526

11500E

Cable, coaxial 2.4 mm

  • For Option 544

8120-6164

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

  • For Options 508 and 526

1250-1743

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

  • For Options 508 and 526

1250-1744

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

  • For Options 508 and 526 when using a 3.5 mm source

83059B

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

  • For Options 508 and 526 when using a 2.4 mm source

11901B

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

  • For Option 544

11900B

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

Above 3.6 GHz Adaptive Flatness Setup

Power Meter Calibration

Splitter Characterization

Frequency Response Adjustment Setup