Location Of 100 Mhz Vcxo Adjustments - HP 8566B Adjustment Manual

short BNC jumper cable W15 is connected between 52 FREQ
REFERENCE EXT and 53 FREQ REFERENCE INT.
3. Set the dc power supply for an output of -8 Vdc. Connect the -8
Vdc output of the dc power supply to the A7A2TPl TUNE test
point. Refer to Figure 3-65 for the location of the A7A2 100 MHz
VCXO Assembly and test point A7A2TPl TUNE.
1 0 0 M H Z
v c x o
TOP VIEW
Figure 3-65. Location of 100 MHz VCXO Adjustments
4. Disconnect the cable 83 (gray/orange) from A7A2J2 100 MHz OUT,
and connect the RF INPUT of the second spectrum analyzer to
5. Press (2--22GHz) on the second spectrum analyzer, and then set the
controls as follows:
CENTER FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . 100 MHz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 kHz
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . +3 dBm
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 kHz
LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 dB/div
TRACE A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CLEAR-WRITE
TRACE B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MAX HOLD
6. Adjust A7A2C4 100 MHz slowly through its full range while
monitoring the display of the second spectrum analyzer. A7A2C4
100 MHz should provide enough adjustment range to shift the
frequency of the 100 MHz VCXO a minimum of f300 Hz from 100
MHz (99.999700 MHz to 100.000300 MHz), and the output power
should not vary by more than 1 dB within this range, as shown in
Figure 3-66.
14. 100 MFIz VCXO Adjustments
Adjustments 3-127