HP 84125A User Manual page 36

3. Press
4. Press
Ensure that the test set hardware is correct for the con guration
selected. There are di erent correction factors for each hardware
con guration. Refer to Chapter 4 for proper test set hardware
con guration.
Note
When either the
selected, the EMC analyzer start and stop frequencies will default
to 2.68 to 18 GHz. This is normal operation of the EMC analyzer
and is due to the internal RF switching paths. Therefore, if the
signal of interest is below 2.68 GHz, you must change the start
frequency of the analyzer to the desired frequency below 2.68 GHz;
press
automatically change to 2.9 GHz.
5. Press
frequency will automatically default to 2.9 GHz.
6. Connect the 50 ohm termination to W3. See Figure 3-7.
7. Setup the EMC analyzer settings by pressing the following keys:
a.
b.
c.
8. Use the RPG knob on the EMC analyzer to center the noise on the
analyzer display.
9. Press the following EMC analyzer keys:
10. Press,
frequency and amplitude in Table 3-5.
11. To measure the Displayed Average Noise Level from 2.68 to
18 GHz, repeat the above procedure skipping step 5.
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84125A/B PRESET ,
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1 GHZ to 18 GHZ to select the 1 to 18 GHz con guration.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
1GHZ to 18GHZ or
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
,
START FREQ "x"
4 5
FREQUENCY
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
, START FREQ , 1
4 5
FREQUENCY
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
, More 1 of 4 ,
4 5
SETUP
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Antenna Factors ,
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Previous Menu , Previous Menu ,
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LIMIT 1 ON OFF with OFF underlined.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
, More 1 of 3 ,
4 5
AMPLITUDE
NNNNNNNNNNNNNNNNNNNNNNNNNN
REF LVL , 40

4
dB V
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, More 1 of 4 ,
4 5
TRACE
ON underlined, 25
4
ENTER
Wait for the completion of 25 sweeps.
!
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, MARKER
4 5
MKR
NNNNNNNNNNNNNN NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CONT , SELECT CONFIG .
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1.5GHZ to 18GHZ softkeys are
. The stop frequency will
4 5
GHz
. The analyzer stop
4 5
GHz
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Correctn Factors ,
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ANTENNA ON OFF with OFF underlined.
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Limit Lines ,
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Amptd Units ,
.
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
More 2 of 4 , VID AVG ON OFF with
.
5
!
HIGH and record the marker
System Setup and Functional Tests 3-17
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Limit 1 ,
NNNNNNNNNNNNNN
dB  V , ,
4 5
AMPLITUDE