5-5.
20130 LOOP PHASE LOCK, A36, A38, A39, A40, AND A43 (Cont’d)
BOTTOM VIEW
Lii
PLL3 VCO ADJ
A39
L17
Li6
160 MHz PEAK
160 MHz PEAK
Figure 5-11.
Location of PLL3 Adjustments
45.
Set the Function Generator controls as follows:
FUNCTION
Sine Wave
FREQ
.
20
kHz
AMPL
—7.7 dBm
46. Set the Spectrum Analyzer controls as follows:
INSTR PRESET
Press
START FREQ
10kHz
STOP FREQ
60 kHz
REFERENCE LINE
0 dBm
RES BW
300 Hz
VIDEO BW
1 kHz
SWEEP TIME
i.2 SEC
SCALE
.
10 dB/DIV
MARKER MODE
NORMAL
47. Set the Spectrum Analyzer Marker to 20 kHz.
48. Connect the active probe to the Spectrum Analyzer input and connect the probe to the output of the 40 kHz
LPF on A36 (see Figure 5-13). (This is the terminal on A36L7 next to A36C24.)
(Selected Value)
1
PEAK
A39
PLL3 UP
CONVERTER
5-32
Adjustments
HP 8340B/41B