Agilent Technologies 856290216 service manual MHz PLL Adjustment Location

17. 16 MHz PLL Adjustment

Procedure

1.Press m to turn the spectrum analyzer off. Remove the spectrum analyzer cover and fold out the A2 controller and A3 interface assemblies. Use a pc board prop to hold up the A3 interface assembly, as shown in Figure 2-26.

2.Connect the equipment as shown if Figure 2-26. The ground lead of the 1O:l probe connects to A2TP10, and the probe tip connects to A2TPlOl.

3.The 16 MHz PLL adjustment location is shown in Figure 2-27.

A2 CONTROLLER ASSEMBLY

a / / / / , / , , / / ,

Figure 2-27. 16 MHz PLL Adjustment Location

4.Press luNE) to turn the spectrum analyzer on. Wait until the spectrum analyzer power-on adjustments have completed.

5.Set the microwave frequency counter as follows:

Sample rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fully counterclockwise 10 Hz-500 MHz/500 MHz-26.5 GHz switch . . . . . . . . . . . . . . 10 Hz-500 MHz 50 R/l MO switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .l MR

6.On the spectrum analyzer, press (-1, REAR PANEL , and 10 ?Bz EXT ,

7.Disconnect W22 (10 MHz frequency counter) from A2J8. The display will probably appear distorted and error messages may appear. Ignore the error messages.

2-64 Adjustment Procedures