HP 85325A Operating and Service Manual 1-11
Installation
Adjustment Procedures
Adjustment Procedures
NOTE
[Brackets]
indicate a front-panel key on a computer keyboard.
{Braces}
indicate a display softkey selection.
LO power must be adjusted before connecting the HP 85325A mixers to
avoid damaging them. Use Procedure 1 or 2, as appropriate:
•
Procedure 1
Use this procedure if you are only going to use the HP 85325A/HP
85325A mixer configuration.
•
Procedure 2
Use this procedure if you are going to reconfigure your system between
HP 85325A/HP 85326A mixers and other mixer types. Procedure 2
eliminates the need to readjust LO power when switching between the
HP 85325A and other mixers.
Procedure 1
This procedure applies to systems that only use HP 85325A mixers.
Initial Setup
1. Zero and calibrate the power meter (refer to your power meter manual).
2. Determine the power sensor calibration factor at 4 GHz, and set the
power meter accordingly.
3. Connect the power meter as shown in Figure 1-4.
Figure 1-4
Measuring LO Power from the Reference Module
4. Measure the power output of the reference module as shown in
Figure 1-4. Be sure to measure power at the end of the LO cable.
