HP 8560A, Service Manual

Page: 61 / 450

4. IF Amplitude Adjustments
Procedure
1. Set the HP 8560A 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 Connect the test cable between and
the 50 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200kHz
REF LVL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..ldB/DIV
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300kHz
VIDEO BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. On the HP press and IF
ADJ OFF.
5. Set the HP 3335A controls as follows:
FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AMPLITUDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55dBm
6. Note the marker value. Ideally it should read -60 +/-.l
7. If the marker reads below -60.1 rotate CAL OSC AMPTD one-third turn
clockwise for every 0.1 below -60 See Figure 2-7 for the location of
8. If the marker reads above -59.9 rotate CAL OSC AMPTD one-third turn
counter clockwise for every 0.1 above -60 A change in the displayed amplitude
will not be seen at this point.
Note
If has inadequate range, refer to “Inadequate CAL OSC AMPTD
Range” in Chapter 9.
9. Press
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 +/-.l
11. Disconnect the test cable from and reconnect W29 to
Adjustment Procedures 2-27