9640A
Instruction Manual
5-12
9640A Phase Noise Test (Optional)
Note
This test applies to the model 9640A only. A separate phase noise test is
provided later in this chapter for the Model 9640A-LPN.
Equipment Required for this Test:
•
Spectrum Analyzer, with phase noise measurement option
•
50
Ω
Leveling Head (supplied with UUT)
Use the following test to verify the UUT phase noise performance using a spectrum
analyzer equipped with a phase noise measurement option:
1.
Connect the output of the 50
Ω
Leveling Head to the RF INPUT of the spectrum
analyzer.
Note
Do not connect the UUT and spectrum analyzer frequency reference inputs
and outputs. Each instrument must be operating independently from its own
internal frequency reference for this test.
2.
Set the spectrum analyzer as follows:
PRESET
EXT REF
On
REF LEVEL
+16 dBm
CENTER FREQ
1 GHz
SPAN 1
MHz
3.
Set the UUT as follows:
Mode
Leveled Sine
Frequency 1
GHz
Level +13
dBm
Output
OPER
4.
Press MARKER
→
PEAK on the spectrum analyzer to place the marker at the signal
peak. Enable the spectrum analyzer phase noise measurement function and allow the
measurement process to complete.
Note
It may be necessary to adjust the spectrum analyzer resolution bandwidth
and/or span to achieve the desired results when measuring phase noise.
5.
Press MKR. Using the keypad, enter a marker frequency of 1 kHz. Observing the
marker data on the spectrum analyzer display, verify the phase noise at a 1 kHz offset
is
≤
-97 dBc/Hz.
6.
Repeat step 5 for the offset frequencies listed in Table 5-5.
7.
Set the UUT output to
STBY
. Remove all connections to the Leveling Head.
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