Freq Resp below 3.6 GHz, Preamp On Adjustment

This adjustment applies to the following models:

This adjustment will use two equipment setups: one using a function generator and another using a PNA-X network analyzer.

To generate corrections below 50 MHz (RF Preselector Off) or 30 MHz (RF Preselector On), the traditional technique is used with a source (function generator), power splitter, and power sensor. The source-splitter-sensor is considered to be a calibrated source.

To generate corrections above 50 MHz (RF Preselector Off) or 30 MHz (RF Preselector On), the PNA-X network analyzer is used as the calibrated source. A calibration must be performed on the PNA-X prior to running the adjustment (see below).

At each correction frequency, the calibrated source amplitude is adjusted to –35 dBm. Next, the flatness corrections are turned off, and amplitude error versus frequency is measured from 9 kHz to the end of Band Zero. The data is then normalized to the 50 MHz error to generate corrections relative to 50 MHz, and stored in the analyzer memory.

Required Test Equipment

Test Equipment

Model Number1

Network Analyzer 1

N5247B Option 425

Function Generator

33622A 

Power Meter

N1914A

RF Power Sensor

  • 2 required

E9304A Option H18

RF Power Splitter, Type-N

11667A 

Cable, BNC

  • 2 required

8120-1840

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

8121-2065 (or equivalent)

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

Adapter, Type-N (m) to BNC (f)

1250-1476

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

1250-1475

Adapter, Type-N (m) to 3.5 mm (f)

  • For Option C35

1250-1744

Adapter, Type-N (m) to 2.4 mm (f)

  • For Option P44

11903D

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

  • For Options < P44

Maury CC-A-35N-MM

Adapter, Type-N (m) to 2.4 mm (m)

  • For Option P44

11903A

  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 PNA and avoid bending the cable unnecessarily.

Power Sensor Calibration

Frequency Response 9 kHz to 50 MHz
Splitter Characterization

Frequency Response 9 kHz to 50 MHz Adjustment Setup (RF Input 1)

Frequency Response 9 kHz to 50 MHz Adjustment Setup (RF Input 2)

Network Analyzer Setup, 50 MHz to 3.6 GHz (RF Input 1)

Network Analyzer Setup, 50 MHz to 3.6 GHz (RF Input 2)