4. IF Amplitude Adjustments

Procedure

1.Set the HP 8560A m switch to off. Remove the analyzer cover and place the analyzer in the service position as illustrated in Figure 2-6. See Figure 2-7 for adjustment location.

2.Disconnect W29, violet coax cable, from A5J3. Connect the test cable between A5J3 and the 50 R output of the HP 3335A. Set the HP 8560A (LINE) switch on.

3.Set the HP 8560A controls as follows:

C E N T E R F R E Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..10.7MHz SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200kHz REF LVL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -6OdBm ATTEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OdB dB/DIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..ldB/DIV RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300kHz VIDEO BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100Hz

4.On the HP 8560A, press INIKR) LCAL) and IF ADJ OFF.

5.Set the HP 3335A controls as follows:

FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.7MHz AMPLITUDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55dBm

6.Note the marker value. Ideally it should read -60 dBm +/-.l dB.

7.If the marker reads below -60.1 dBm, rotate A4R826 CAL OSC AMPTD one-third turn clockwise for every 0.1 dB below -60 dBm. See Figure 2-7 for the location of A4R826.

8.If the marker reads above -59.9 dBm, rotate A4R826 CAL OSC AMPTD one-third turn counter clockwise for every 0.1 dB above -60 dBm. A change in the displayed amplitude will not be seen at this point.

Note

If A4R826

has inadequate range, refer to “Inadequate CAL OSC AMPTD

 

Range” in

Chapter 9.

 

 

 

9.Press AD3 CURR IF STATE . After allowing the analyzer time to complete the adjustments, the displayed amplitude and marker reading should change.

10.Repeat steps 7 and 8 until the marker reads -60 dBm +/-.l dB.

11.Disconnect the test cable from A5J3 and reconnect W29 to A5J3.

Adjustment Procedures 2-27