Agilent Technologies HP 8642A/B Spécifications Page 315

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The amount of tuning allowed at the external reference input to the
HP 8662/63A is restricted to a ±25 ppm deviation and by the HP 3048A
PLL bandwidth. 10 kHz is the maximum PTR allowed when tuning
the external reference. Using the maximum tuning graph, Figure 6-6,
determine the maximum PTR allowed at the time base and restrict the
Voltage Tuning Range so it will not exceed that range. The PTR is the
Tuning Constant of the reference time base multiplied up to the carrier
frequency times the Voltage Tuning Range.
For example, 10 MHz
B
VCO Tuning Constant:
loo Hz
v
2 GHz
___
loo Hz
v om
_ 20 kHz
V * io MHz - V
x zuu
~ V
Peak Tuning Range:
^^ x 0.5V = 10 kHz = Max PTR
(This graph only applies to the HP 8662A/63A. Similar graphs must be
determined for other RF sources when tuning their references.)
ct
2.5MHz
250kHz
«
n>
r
D
(X
n>
c
r
V
o
a>
a.
25kHz
10kHz
2.5kHz
-
-
-
i i I I
MAX PTR
4>
f
i i
7
ALLOWED
4>
\ \
250Hz
10MHz 100MHz 1GHz 10GHz 100GHz
Carrier Frequency
Figure 6-6. Graph of Maximum External Reference Tuning
6-12 RF Sources
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