Filter
Top Products
Receiver and Source Requirements.
Refer to Chapter 7, “Specifications and Measurement
Uncertainties.
n
IF Input: R always; and port 1 or port 2 for a ratio measurement.
Display Annotations. The
analyzer shows the annotation of s when the frequency offset mode
is on. The annotation of? indicates that the source frequency is approximately 10 MHz away
from the sum of the IF and
Lo
frequencies that you requested. This is most likely caused by
the
Lo
frequency being outside the
-
1 to + 5 MHz accuracy requirement.
Error Message.
If you connect your test device before you switch on the frequency offset
function, the error message PHASE LOCK CAL
FAILED
appears on the screen. This is normal, and
:
fl
(-J&appear
when
you
press
the
~~il~~~~,~~~~~~~~~
s-&&y.
i
i
..s
. . . . .
..i.......
i.;.;;
ii.
..ws.
. . . . . . . . . . . . . . . ..A
:...::.<..
Spurious Signal
Passband
Frequencies.
Unwanted mixing products (or spurious
Lo
signals)
at specific frequencies can cause measurement inaccuracy, because of the characteristics of
a sampler. These specific frequencies can be calculated. You can reduce unwanted mixing
products going to the sampler by inserting a low pass filter at your test device’s IF output.
6-122
Application and Operation Concepts