Keysight N5224B, Руководство по обслуживанию

Страница: 80 / 614

3-48 Keysight N5224B/25B Service Guide
Tests and Adjustments
Adjustments
3-
2. Follow the instructions and prompts as they are displayed.
Receiver Adjustment
The receiver calibration is used to adjust the network analyzer receivers for a
flat response across its full frequency range:
1. A power meter/sensor is connected to Port 1, as shown in Figure 3-17 , to
establish a reference for flatness.
2. A cable is inserted between the power sensor and the test port, as shown
in Figure 3-18 , to establish a reference for the cable.
3. The same cable is connected between test port 1 and test port 2, as
shown in Figure 3-19 , and a signal from Port 1 is used to adjust the “B”
receiver at Port 2.
The adjustment is repeated using a signal from Port 2 to adjust the “A”
receiver at Port 1.
Data obtained during this adjustment are stored in the mxcalfile_pxx files in
flash memory on the test set motherboard, with a backup copy stored on the
hard disk drive. The data are used in subsequent measurements.
Solid state drives can be swapped or replaced without concern for the
mxcalfile_pxx files. If the test set motherboard is replaced, the PNA firmware
will automatically create new primary mxcalfile_pxx files from the backup
copies on the hard drive.
These files can be recreated by performing another receiver calibration
adjustment.
Equipment Used for the Receiver Adjustment
Procedure
1. Connect the equipment as shown in Figure 3-17 . Connect a GPIB cable
between the network analyzer and the power meter.
Equipment Type Model or
Part Number
Alternate Model Part
Number
Power meter E4418B/E4419B E4418A/E4419A
Power sensor, 2.4 mm 8487A None
Adapter, 2.4 mm (f) to 2.4 mm (f) 11900B 85056-60007
RF Cable, 2.4 mm (f) to 2.4mm (f) 85133C 85133E