HP 8560A

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:
CENTERFREQ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..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