Fluke 96000 Series - Base Adjustment - Front Panel Head RF Output

96000 Series
Service Manual
4-4
Base Adjustment - Front Panel Head RF Output
Equipment required:
• AC Measurement Standard
• Precision 50 Ω feedthrough termination
• Power Meter
• Power Sensor, Diode, 50 Ω
• Spectrum Analyzer/Measuring Receiver
• 50 Ω Type-N female-to-BNC male adapter
Use the following procedure to adjust the UUT base (mainframe).
Note
If the Reference Frequency Adjustment was just completed, omit
steps 1 through 2, below.
1. On the UUT, push , followed by the softkeys Support
Functions>Calibration>Adjust Instrument.
2. Using the keypad, enter the password, and push .
3. Push the softkey Adjust Base.
4. Remove the Leveling Head from the UUT base unit (if connected). Connect
the UUT front panel Head RF Output to INPUT 1 of the AC Measurement
Standard via a precision 50 Ω feedthrough termination.
Note
For measurements made with the AC Measurement Standard during
calibration adjustment, use a common mode choke as described in
the Level Accuracy Test. Connect the choke input low to the AC
Measurement Standard chassis ground. Keep the ground
connection as short as possible and set the AC Measurement
Standard to Internal Guard.
5. Set the UUT to OPER.
6. Using the blue arrow keys and rotary knob, edit the UUT Actual output until
the AC Measurement Standard indicates the Target value stated. Push
Accept Target.
7. Push Next Target.
Note
If the AC Measurement Standard used does not read the UUT
output in dBm directly, calculate the desired value using the
following formula:
()










=Ω
−3
2
10
50
log1050
V
dBm
Alternatively, the UUT units selection may be changed to V rms to
display targets and adjust output values directly in rms voltage. Push
and select the required units.
Note
Measurements made on the 5790A 2.2 mV range (at levels below
40 dBm) require correction for the 2.2 mV range linearity error.