HP 35601A Operating And Service Manual page 24

Operation
Model 35601A
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Phase lock loop error meter: This meter shows the error of
the high frequency phase lock loop during Phase Noise
Analysis measurements or the deviation from quadrature in
non-phase-locked measurements. The meter also shows
the frequency drift of the source under test in AM/PM Noise
Analysis mode.
Input from 3585A Tracking Generator: This input accepts
the Tracking Generator output of the 3585A.
Phase detector inputs (1GHz to 18GHz): These are inputs
for the reference vco and the vco under test in Phase Noise
Analysis. The inputs can operate from 1 .OGHz to 18GHZ
with a maximum input of +13dBm. The impedance of
these inputs is 50(2. Each input may be used for the
reference or the device under test.
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Phase detector inputs (1l72GHz to 18GHz): These are in­
puts for the reference vco and the vco under test in Phase
Noise Analysis. The inputs can operate from 1.2GHz to
18GHz with a maximum input of + lOdBm. The impedance
of these inputs is 50® . Each input may be used for the
reference or the device under test.
( 5 ) Phase lock loop vco control voltage output: This output pro­
vides the control voltage for the vco under test in Phase
Noise Analysis. The output has a 50Q source impedance.
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(S) Output to 3585A (1 MQ): This output connects to the 1 MQ
input of the 3585A.
( 7 ) Output to 3585A (50Q):This output connects to the 50Q
input of the 3585A.
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Signal input: This is used in Phase Noise Analysis when it is
desired to use an external mixer for phase difference detec­
tion of the reference and test sources.
Indicators: The four LEDs on the front panel, from top to
bottom, are the following indicators:
a) Out-of-lock. Indicates that the high frequency phase
lock loop is not locked, or has had a large perturbation in
phase error.
b) Overload. This LED will light, and remain on, whenever
the signal input instantaneously exceeds ± 2 volts.
c) Listen. This indicates that the -hp- 3 5601A is accepting
commands over the HP-IB. Note that this instrument only
listens and never talks.
d) On. Indicates power on.
(jjj) Line off/on: Turns the instrument power on and off.
Figure 3 1. -hp- 35601A Front Panel
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