Freq Resp Unpreselected Preamp Off Adjustment

This adjustment applies to the following models with Option MPB:

N9030B PXA models with frequency options 544 or 550 and without bandwidth options B2X or B5X have the option to run the "classic" alternate adjustment using a PSG-D signal generator. These "classic" adjustments are run from the Utilities Test Plan. For more information, click here.

The solution used on this topic page with the PNA-X network analyzer is the preferred solution for all N9030B PXA models with frequency options > 526.

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 uses these stored corrections to make accurate amplitude measurements.

In order to measure the conversion loss accurately, a known power must be applied to the DUT. 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).

The related performance test for this adjustment is Freq Resp Above 3.6 GHz Preamp Off.

Click here for troubleshooting.

Required Test Equipment

Test Equipment

Recommended Model Number

Network Analyzer1, 2

N5247B

Cable, BNC (m) to BNC (m)

8120-1840

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

8121-2065 (or equivalent)

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

11900B (or equivalent)

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

  • For N9021B options ≤ 526

11903A

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

  • For N9021B Option C35

11901C

  1. A calibration must be performed on the network analyzer prior to running the adjustment (see below).

  2. PNA preference setting recommendation: Unselect Power: Force RF Power Off at the end of the sweep

 

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

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