3-8
HP 70427A/HP 70428A User’s Guide
Downconverter Operation
Millimeter Phase Noise Measurement - User Control
Procedure
Step 1 - Preset the downconverter
First make sure the downconverter’s
ACT
indicator is lit. It it isn’t, do the
following:
1. Press the
DISPLAY
key.
2. Press the
NEXT INSTR
softkey, repeatedly if necessary, until the
ACT
indicator lights up.
3. Press the
INSTR PRESET
key.
Step 2 - Configure the downconverter for external mixer
operation
1. Press the
Mode
μ
W|mm
softkey until mm is underlined.
2. Press the
mm Band
softkey.
3. Press the softkey that corresponds to the DUT’s frequency range and to
the mm band of the mixer.
4. Press the
EXIT
softkey.
Step 3 - Determine the downconverter’s IF frequency
The downconverter’s IF frequency will be displayed on the
IF:
display. The
downconverter calculates this frequency when an input frequency is entered.
In mm mode, the input frequency must be in the mm band selected in step 2.
First enter the DUT frequency into the downconverter as follows:
1. Press the
Freqs
softkey.
2. Press the
INPUT FREQ
softkey.
3. Enter the frequency with the numeric keypad.
4. Press the
GHz
,
MHz
,
kHz,
or
Hz
softkey.
Then read the IF frequency from the
IF:
display.
Step 4 - Enable mixer bias if needed
If the message
Enable and adjust mixer bias:
, was displayed at the
bottom of the MMS display when the input frequency was entered, do the
following:
•
Press the
BIAS ON | OFF
softkey until ON is underlined.
The mixer bias will be adjusted in step 11.
Summary of Contents for 70427A
Page 11: ...x HP 70427A HP 70428A User s Guide Declaration of Conformity ...
Page 13: ... xii HP 70427A HP 70428A User s Guide Typeface Conventions ...
Page 243: ...9 42 HP 70427A HP 70428A User s Guide Technical Data HP 70428A Option 002 Specifications ...
Page 299: ...10 56 HP 70427A HP 70428A User s Guide Softkeys and Displays IF Figure 10 42 μW Mode HP70472A ...
Page 385: ...10 142 HP 70427A HP 70428A User s Guide Softkeys and Displays YTF Cal ...
Page 435: ...12 14 HP 70427A HP 70428A User s Guide Remote Programming Commands ...
Page 607: ...15 10 HP 70427A HP 70428A User s Guide Adjustments 10 MHz Oscillator Adjustment ...
Page 611: ...16 4 HP 70427A HP 70428A User s Guide Customer Support ...