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87
turn ON the [User Flatness ON/OFF]
。
Step 7. Press the
【
Calibration
】
key and select [User Flatness], the “User Calibration” dialog
pops up.
Step 8. In the “User Calibration” dialog, select [Delete All Counts] to ensure all calibration
data has been cleared.
Step 9. Input counts to be calibrated:
Input counts at a step of 1GHz manually or generate counts
automatically.
In the example, Auto Fill is used.
1)
Select [Freq Start] under [Auto Fill] and input 4GHz;
2)
Select [Freq Stop] and input 7GHz;
3)
Select [Freq Step] and input 1GHz;
4)
Select [Confirm Fill].
The frequency list will be automatically filled with: 4GHz (Freq Start), 7GHz (Freq Stop) and an
increment of 1GHz; input calibration data, as shown in Fig.3.14.
Fig.3.14 User Flatness Calibration List
Step 10. After all parameters have been set, start the calibration.
Ensure that the signal generator is connected to the power meter with a GPIB cable, select [ GPIB
Port] under [System] to set the GPIB address, programming language and power meter selection
Select [Calibrate All Counts] to start the calibration and the power meter is controlled by the signal
generator to perform the count calibration continuously according to the calibration list. Calibrated
data is automatically stored after calibration.
3.2.7 Selecting pulse modulation input
3.2.7.1 Selection of ALC status when pulse modulation is turned on
Limited to the tracking speed of generator‘s built-in ALC loop, the ALC loop should be set to
open-loop or search mode when the pulse modulation is turned on and the pulse width is smaller
than 1 μs.
3.2.7.2 Selecting pulse input
1)
Pulse input “Scalar”
Press the
【
Pulse
】
key or tap [Pulse] on the touchscreen, and Pulse Modu Config Dialog pops
up; rotate the knob clockwise (or counterclockwise) to select “Source” option, press the
knob to select [Scalar]; or tap “Source” on the touchscreen to select [Scalar].
Activate the pulse modulation and enable the internal pulse generator to generate 27.8kHz
square wave (pulse width: 18μs, period: 36μs, as shown in Fig.3.15) with RF envelope rise and fall
