Procedure - HP 70427A User Manual

Procedure

Downconverter Operation
Millimeter Phase Noise Measurement - User Control
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 key.
DISPLAY
2. Press the
NEXT INSTR
indicator lights up.
3. Press the
INSTR PRESET
Step 2 - Configure the downconverter for external mixer
operation
Mode μ W|mm
1. Press the
2. Press the softkey.
mm Band
3. Press the softkey that corresponds to the DUT's frequency range and to
the mm band of the mixer.
4. Press the softkey.
EXIT
Step 3 - Determine the downconverter's IF frequency
The downconverter's IF frequency will be displayed on 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 softkey.
Freqs
2. Press the
INPUT FREQ
3. Enter the frequency with the numeric keypad.
4. Press the , ,
GHz MHz
Then read the IF frequency from the
Step 4 - Enable mixer bias if needed
If the message
Enable and adjust mixer bias:
bottom of the MMS display when the input frequency was entered, do the
following:
•
Press the
BIAS ON | OFF
The mixer bias will be adjusted in step 11.
3-8 HP 70427A/HP 70428A User's Guide
softkey, repeatedly if necessary, until the ACT
key.
softkey until mm is underlined.
softkey.
or softkey.
kHz, Hz
display.
IF:
softkey until ON is underlined.
display. The
IF:
, was displayed at the