HP 35601A Operating And Service Manual page 126

Spectrum analyzer interface
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fVCO CONTROL VOLTAGE!
|(USER REF1I
|IUSER VCOI| |
^
I
t— — - — — I
L, _
_
— J
I
1
PMASE-LOCKCO LOOP I S LOCKEO WHEN K 1 0 C S 3 ARE
A C T I V A T C O . WHEN K t . K Z ( K 1 3 HAVE SELECTEO
THE CORRECT I N P U T P A T H . WHEN THE C A I N S
HAVE BEEN S E T . AND I M E N USER OSCILLATORS
HAVE B E E N CONNECTEO ANO ADJUSTEO FOR
H I C H - F R C O PHASE N O I S C MEASUREMENT
" ■ " N
P H A S E - L O C K E D
L O O P
Figure A-l. 35601A Block Diagram
A-3/A-4

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