HP 8562E, Service Manual

Page: 438 / 482

L O D I S T R I B U T I O N
A l l
YTO
J 3 I
J 2
S A M P L E R O U T - 9 T O - 2
H I B A N D T O
J 5 I
L O B A N D T O
I
L O O U T 1 4 . 5 T O 1 8 . 5
F O R H P 8 5 6 1 E )
A S V I N C R E A S E S
A7 OUTPUT INCREASES
ONLY ONE MIXER OUT
F O R H P
I
I
SCHEMAT I C
3 OF 5
- - - - - - - - - - - - - - - - - -
‘ P / O A l 4 F R E Q U E N C Y
I CONTROL
I
I
I
REF VOLTAGE
T O V O L T
Figure 12-3. A7 First LO Distribution Amplifier Drive
Refer to function block P on Al4 Frequency Control Schematic Diagram (sheet 3 of 5) in the
HP 8560 E-Series Spectrum Analyzer Component Level Information.
1. Connect the positive lead of a DVM to pin 14 and the negative lead to
pin 6.
2. Set the HP 85623 to the following settings:
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. The voltage should measure approximately 0 Vdc (TTL low).
4. Set the HP 85623 center frequency to 3
5. The voltage should measure approximately Vdc (TTL high).
12-12 RF Section