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Table 3-2. Setup Considerations for the 10 MHz Frequency
Standard Measurement Example (1 of 2).
Setup Considerations
Comments
Measurement Noise Floor
The signal amplitude at the R input port on the HP 11848A sets
the measurement noise floor level. Use the following graph to
determine the amplitude required to provide a noise floor level
that is below the expected noise floor of your DUT. (The
Checking the Beatnote procedure in this section will provide you
with an opportunity to estimate the measurement noise floor
that your DUT will provide.)
L PORT LEVEL +15dBm
1
?
5
1
CO
s
(t
+ 15
+5
-5
-IS
-MB
-150
-160
-170
-180
EXPECTEO PHASE NOISE FLOOR OF DUT (dBc/Hz)
f >
10kHz
If the output amplitude of your DUT is not sufficient to provide
an adequate measurement noise floor, it will be necessary to
insert a low noise amplifier between the DUT and the
HP 11848A input. (Refer to Inserting a Device in the Problem
Solving section of this chapter for details on determining the
effect that the amplifier's noise will have on the measured noise
floor.)
3-8
Signal Source Applications
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