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The HP 3048A system must be equipped with option 201 which adds a
1.2 GHz to 18 GHz phase detector to the HP 11848A. For measurements
above 18 GHz, the HP 3048A system must also include option H26.
Step 1 - Preset the HP 70428A
First, make sure the module's ACT indicator is lit. If it isn't, do the
following:
1. Press the
key.
DISPLAY
2. Press the
NEXT INSTR
indicator lights.
Then, press the
INSTR PRESET
If the module is an HP 70427A or HP 70428A Option 002 press the
softkey to put it in source mode.
Step 2 - Enter HP 70428A frequency and power
1. Set the HP 70428A to the DUT frequency. The HP 70428A's frequency
is set in 600 MHz steps, so the DUT must be at a frequency to which it
can be set.
a. Press the
Output
b. Press the
softkey.
FREQ
c. Enter the frequency with the numeric keypad.
d. Press the
,
GHz
MHz
2. Enter a power of +10 dBm.
a. Press the
Output
b. Press the
POWER
c. Enter 10 with the numeric keypad.
d. Press the
softkey to complete the entry.
dBm
Step 3 - Decide which instrument to tune
Either the DUT or the HP 70428A must be the VCO. If the DUT is the VCO
go to step 6 below.
Step 4 - Select HP 70428A tuning sensitivity
Do this only if the HP 70428A is being tuned. First, determine which
sensitivity to use as described below:
The HP 70428A's tuning must be selected so that its tuning range will be
greater than the expected drift of the DUT. The left column of the following
table shows the choices.
Phase Noise Measurement With PLL
softkey, repeatedly if necessary, until the ACT
key.
softkey.
,
, or
softkey to complete the entry.
kHz
Hz
softkey.
softkey.
HP 70427A/HP 70428A User's Guide 4-3
Source Operation
Source
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