Fluke 96000 Series Service Manual page 131

If the Reference Frequency or Base Adjustment was just completed,
omit steps 2 and 3, below.
1. Ensure a 75 Ω Leveling Head is connected to the UUT base.
2. On the UUT, push , followed by the softkeys Support
Functions>Calibration>Adjust Instrument.
3. Using the keypad, enter the password, and push .
4. Push the softkey Adjust Head.
5. Connect the UUT Leveling Head to the input of the AC Measurement
Standard via a precision 75 Ω feedthrough termination. (If a Type-N
feedthrough termination is not available, use a 75 Ω BNC feedthrough
termination and appropriate adapters.)
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.
6. Set the UUT to OPER.
The next steps make the low frequency flatness adjustment of the
Ω
75 Leveling Head using the AC Measurement Standard.
7. 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.
If the AC Measurement Standard used does not read the UUT
output in dBm directly, calculate the value using this formula:
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.
Measurements made on the 5790A 2.2 mV range (at levels below
−42 dBm) require correction for the 2.2 mV range linearity error.
8. Push Next Target.
9. Repeat steps 7 and 8 for all points requiring the use of the AC Measurement
Standard (the UUT text box will indicate Use Precision AC Voltmeter). Use
Power Meter. Set the UUT to STBY.
10. Disconnect the AC Measurement Standard and feedthrough termination from
the Leveling Head. Connect the UUT 75 Ω Leveling Head to the input of the
Note
Note
Note
Note
 
2
V
 
( )
75
Ω =
dBm 75 10 log
 
−3
10
 
 
Note
Calibration Adjustment
Calibration Adjustments
4
4-11