Freq Resp Above 3 GHz Preamp Off Adjustment

This adjustment applies to the following models:

This adjustment is performed in two steps (for Options 513 and 526). 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 50 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 GHz (Preamp Off).

Click here for troubleshooting.

Required Test Equipment

Test Equipment

Recommended Model Number

Microwave Signal Generator #1

PSG Models
(see equipment list)

Power Meter

N1914B

Microwave Power Sensor
(2 required)

8485A 

Microwave Power Splitter

11667B

Coaxial Cable, 3.5 mm

11500E

BNC Cable

8120-1840 

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

1250-1743

3.5 mm (f) to 3.5 mm (f) adapter
(for 3.5 mm source)

83059B

3.5 mm (f) to 2.4 mm (f) adapter
(for 2.4 mm source)

11901B

3.5 mm (f) to Type-N (m)
(8485A adapter)

08485-60005

Connection Setups

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

Above 3 GHz Adaptive Flatness Setup

 

Power Meter Calibration

 

Splitter Characterization



 

Frequency Response Above 3 GHz
(Preamp Off) Adjustment Setup