I
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Making Measurements
Measuring
D8ViC8S
with Your Network Analyzer
When
to
Use
Attenuation
and
Amplification
in
a
Measurement
Setup
When to
Us8
Attenuation
l
For accurate measurements, use external attenuation to limit the power at
the RF IN port to + 10
dBm
(for narrowband measurements) or + 16
dBm
(for broadband measurements).
CAUTION
Always
use attenuation on the TRANSMISSION RF IN port if your test
device’s output power exceeds the receiver damage limit of +23
dBm
or
f25
Vdc.
l
Use attenuation on the RF IN port to reduce mismatch errors. See
“Reducing Mismatch Errors” in Chapter 5 for more information.
l
In an AM delay measurement (Options
1DA
and
1DB
only), use attenuation
directly
before
the DUT if the device’s input power must be less than
the
-
10
dBm
minimum
specihed
detector level. (If you reduce the input
power to the DUT by lowering the analyzer’s source power, the reference
detector, X, will be below its specified range.)
Use attenuation directly after the DUT if the device’s output power is
greater than the + 13
dBm
maximum
speciiied
detector level.
When to Use
Amplification
l
For accurate measurements, ampltication may be needed on the analyzer’s
RF OUT port. Use amplification when your test device requires input
power that exceeds the analyzer’s maximum specified output power.
The maximum specified output power is highly dependent upon the
model and option configuration of your analyzer as well as the frequency
range of your test setup. It ranges from
+4
to + 16
dBm.
See “Source
Specifications” in Chapter 10 to determine the maximum spectied output
power of your analyzer.
l
In an AM delay measurement (Options
1DA
and
1DB
only), use
amplification
directly before the DUT if the device’s input power must be
greater than the maximum power available at the power splitter output.
Use
ampliiication
directly after the DUT it the device’s output power is less
than the -10
dBm
minimum
speciiied
level needed by the test detector
(Y).
3-9
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