Noise Figure Adjustment

This adjustment is ONLY for the following 13.5 or 26.5 GHz models with Noise Figure:

• N5241A Opt 029

• N5242A Opt 029

• N5244A Opt H29

• N5245A Opt H29

See Adjustment procedure for 43.5 GHz, 50 GHz, and 67 GHz models.

This procedure does the following:

• Sets warning level for overpower conditions at the noise receiver. (Noise compression test)

• Sets IF Gain flatness for the noise receiver. (IF Gain Cal)

• Overwrites the factory noise receiver calibration. (Noise correction test).

Perform this procedure after replacing any component in the noise figure circuitry, or if the PNA fails the noise IF gain portion of the OP check.

To launch the adjustment program:

1. Click Utilities, then System, then Service, then Adjustments

2. Click Noise Adjustment  Available only with Opt 029 or Opt H29 installed.

Equipment Required

• Compatible ECal module (N4691A recommended)

• Compatible Noise source (346C recommended)

• High quality RF Cable

Note: On a 50 GHz Option H29 PNA, noise figure adjustments and measurements are limited to 26.5 GHz.

Advanced   For Service personnel only.

Select Adjustments   Leave all three checked, unless otherwise instructed.

Procedure

This adjustment is made without the Noise Tuner connected. Connect the original jumper cable to the PNA front panel.

This adjustment requires a compatible ECal module.  Make sure the ECal USB cable is connected to the PNA before beginning. Also required is a 26.5 GHz noise source such as the 346C.

Ignore any beeps or warnings as the adjustment program is running.

The adjustment program prompts you through the following steps:

1. Select the ENR file for the Noise Source you will be using. This adjustment will automatically remember, and use, the last file selected.  These files should normally reside in the C:/Program Files/Keysight/Network Analyzer/Noise directory, but they can also exist elsewhere. If the proper file does not already exist, click Create New to enter data for the noise source you will be using.

2. Click Begin

3. Connect a high-quality cable between port 1 and port 2.

4. When prompted, connect the Noise Source to port 2, either directly or with a short, low-loss adapter.

5. You will be prompted to reconnect the high-quality cable between ports 1 and 2.

6. When prompted, disconnect the cable at port 2 and insert the ECal module between port 2 and the free end of the cable.  Connect the ECal module directly to port 2 without using any adapters if possible.  

The entire procedure takes about 15-30 minutes.

Noise Figure Adjustment

This adjustment is ONLY for the following 43.5, 50, and 67 GHz models with Noise Figure:

N5244A Opt 029

N5245 Opt 029

N5247A Opt 029

This procedure does the following:

• Sets warning level for overpower conditions at the noise receiver. (Noise compression test)

• Sets IF Gain flatness for the noise receiver. (IF Gain Cal)

• Sets the proper offset to compensate for Noise Bandwidth offset variations

• Overwrites the factory noise receiver calibration. (Noise correction test).

Perform this procedure after replacing any component in the noise figure circuitry, or if the PNA fails the noise IF gain portion of the OP check.

To launch the adjustment program:

• Click Utilities, then System, then Service, then Adjustments

• Click Noise Adjustment  Available only with Opt 029 installed.

Equipment Required

• Compatible ECal module (N4693A or N4694A recommended)

• Power Meter with compatible Sensor (8487A, N8487A, or N8488A required)

• High quality RF Cable

Note: On a 67 GHz PNA, noise figure adjustments and measurements are limited to 50 GHz.

Advanced   For Service personnel only.

Select Adjustments   Leave all four checked, unless otherwise instructed.

This adjustment requires a compatible 50 or 67 GHz ECal module.  Make sure the ECal USB cable is connected to the PNA before beginning.  Ignore any beeps or warnings as the adjustment program is running.

The adjustment program prompts you through the following steps:

1. Select the GPIB address of the power meter you will be using.  If using a dual power meter, select the input channel that the sensor is connected to.

2. Click Begin

3. Follow all prompts.

4. When prompted for the ECal module, disconnect the cable at port 2 and insert the ECal module between port 2 and the free end of the cable.  Connect the ECal module directly to port 2 without using any adapters if possible.  

The entire procedure takes about 30-45 minutes.

Noise Figure Adjustment Data Storage for all PNA models

• The correction data is stored in the flash memory on the Test Set Mother Board.