Calibration
Calibration Adjustments
5
5-53
8.
Set the frequency counter controls for a reliable and repeatable frequency
measurement.
9.
Using the blue arrow keys and rotary knob, edit the UUT
DAC Value
until the
frequency counter indicates 10.00000000 ± 0.00000005 MHz.
10.
Press
Previous Menu
. If desired to proceed with base adjustment, press
Adjust
Base
. If not, press
Exit
.
Base Adjustment
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, press
, followed by the soft key
Calibration
and then softkey
Calibrate Instrument
.
2.
Using the keypad, enter the password, followed by the
ENTER
key.
3.
Press the soft key
Adjust Base
.
4.
Remove the Leveling Head from the UUT base unit (if connected). Connect the UUT
SMA output to INPUT 1 of the AC Measurement Standard via a precision 50
Ω
feedthrough termination.
Note
It is recommended that for measurements made with the AC Measurement
Standard during calibration adjustment a common mode choke is used as
described in the Level Accuracy Test, with the choke input low connected 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. Press
Accept Target
.
7.
Press
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
log
10
50
V
dBm
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