Freq Resp above 3.6 GHz, Preamp On Adjustment

This adjustment applies to the following models:

The DUT’s internal flatness corrections are turned off. The Preamp is turned on and the RF Attenuation is set to 10 dB. Amplitude error is measured as a function of frequency depending on the preamplifier option. The source is the PNA-X which is calibrated to –35 dBm. The measured error is normalized to 4800 MHz and the error is stored in the analyzer memory as frequency/amplitude pairs.

The Preamp On Flatness is specified in 0 dB RF attenuation, but this adjustment is performed in 10 dB attenuation so that the slope corrections can work with the Preamp On state. The Flatness correction points are fixed points at 50 MHz spacing (except in band 1). The frequency band is locked so corrections at the band overlap region can be measured without being in the wrong band.

The related performance test for this adjustment is Freq Resp Above 3.6 GHz Preamp On Performance Test.

Required Test Equipment

Test Equipment

Model Number1

Network Analyzer 1

N5247B Option 425

Cable, 2.4 mm (f) to 2.4 mm (m)

8121-2065 (or equivalent)

Cable, BNC

8120-1840

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

  • For Options < P44

  • Calibration plane adapter

11901B

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

  • For Option P44

  • Calibration plane adapter

11900B (or equivalent)

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

  • For Options < P44

Maury CC-A-35N-MM

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

Network Analyzer Calibration Procedure

The network analyzer used in this adjustment must be calibrated prior to running the adjustment. The calibration will need to be repeated once every three days or if the connectors or cables have been disturbed. If it's been within the three day time frame and the connectors and cables have not been disturbed, then the network analyzer calibration is not necessary and you may proceed with the adjustment.

For a list of required equipment and calibration instructions to perform the network analyzer calibration, refer to Network Analyzer Freq Sweep Calibration.

Connection Setups

Due to the sensitivity of this adjustment, minimize cable movement from the network analyzer and avoid bending the cable unnecessarily.

Adjustment Setup (RF Input 1)