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Фрагмент инструкции
The RF output changes to the frequency value of the table row containing the cursor and 1.000 000 000 00 is displayed in the AMPLITUDE area of the display. 2. Observe and record the measured value from the power meter. 3. Subtract the measured value from 0 dBm. 4. Move the table cursor over the correction value in row 1. 5. Press Edit Item > enter the difference value from step 3 > dB. The signal generator adjusts the RF output amplitude based on the correction value entered. 6. Repeat steps 2 through 5 until the power meter reads 0 dBm. 7. Use the down arrow key to place the cursor over the frequency value for the next row. The RF output changes to the frequency value of the table row containing the cursor, as shown in the AMPLITUDE area of the display. 8. Repeat steps 2 through 7 for every entry in the User Flatness table. Save the User Flatness Correction Data to the Memory Catalog This process allows you to save the user flatness correction data as in the signal generator’s memory catalog. With several user flatness correction files saved to the memory catalog, any file can be recalled, loaded into the correction array, and applied to the RF output to satisfy specific RF output flatness requirements. 1. Press Load/Store. 2. Press Store to File. 3. Enter the file name FLATCAL1 using the alphanumeric softkeys, numeric keypad, or the knob. 4. Press Enter. The user flatness correction array file FLATCAL1 is now stored in the memory catalog as a UFLT file. Applying a User Flatness Correction Array Press Return > Return > Flatness Off On to On. This applies the user flatness correction array to the RF output. The UF indicator is activated in the AMPLITUDE section of the signal generator’s display and the frequency correction data contained in the correction array is applied to the RF output amplitude. Recalling and Applying a User Flatness Correction Array Before performing the steps in this section, complete “Creating a User Flatness Correction Array” on page 135. 1. Press Preset. 2. Press Amplitude > More (1 of 2) > User Flatness > Configure Cal Array > More (1 of 2) > Preset List > Confirm Preset. 3. Press More (2 of 2) > Load/Store. 138 Chapter 4 Optimizing Performance Creating and Applying User Flatness Correction 4. Ensure that the file FLATCAL1 is highlighted. 5. Press Load From Selected File > Confirm Load From File. This populates the user flatness correction array with the data contained in the file FLATCAL1. The user flatness correction array title displays User Flatness: FLATCAL1. 6. Press Return > Flatness Off On to On. This applies the user flatness correction data contained in FLATCAL1. Returning the Signal Generator to GPIB Listener Mode During the user flatness correction process, the power meter is slaved to the signal generator via GPIB, and no other controllers are allowed on the GPIB interface. The signal generator operates in GPIB talker mode, as a device controller for the power meter. In this operating mode, it cannot receive SCPI commands via GPIB. If the signal generator is to be interfaced to a remote controller after performing the user flatness correction, its GPIB controller mode must be changed from GPIB talker to GPIB listener. If an RF carrier has been previously configured, you must save the present instrument state before returning the signal generator to GPIB listener mode. 1. Save your instrument state to the instrument state register. For instructions, see “Saving an Instrument State” on page 6 . 2. Press Amplitude > More (1 of 2) > User Flatness > GPIB Listener Mode. This presets the signal generator and returns it to GPIB listener mode. The signal generator can now receive remote commands executed by a remote controller connected to the GPIB interface. 3. Recall your instrument state from the instrument state register. For instructions, see “Saving an Instrument State” on page 6 . Chapter 4 139 Optimizing Performance Creating and Applying User Flatness Correction Creating a User Flatness Correction Array with a mm-Wave Source Module CAUTION Option 521 signal generators can damage MM source modules. Consult the MM source module’s operating manual for input damage levels. In this example, a user flatness correction array is created to provide flatness-corrected power at the output of an Agilent 83554A millimeter-wave source module driven by an E8257D. The flatness correction array contains 28 frequency correction pairs (amplitude correction values for specified frequencies), from 26.5 to 40 GHz in 500 MHz intervals. This will result in 28 evenly spaced flatness corrected frequencies between 26.5 GHz and 40 GHz at the output of the 83554A millimeter-wave source module. An Agilent E4416A/17A/18B/19B power meter (controlled by the signal generator via GPIB) and R8486A power sensor are used to measure the RF output amplitude of the millimeter-wave source module at the specified correction frequencies and transfer the results ...
Эта инструкция также подходит к моделям:Электрогенераторы - E8267D PSG (2.79 mb)