Series 8650A Universal Power Meters - Giga-tronics

Series 8650A Universal Power Meters1. Turn on the calibrator by entering "L" or by manually turning on the calibrator through the frontpanel Meter Setup Menu.2. Set the frequency to 50 MHz by using the “X” command or by manually setting the frequency of thecalibrator to 50 MHz. (It is necessary to do this only if Option 12 is installed).3. Type “D”. The 8650A will request a DAC value. Type “65000” and press the ENTER key. Themaximum value is 65535. Type “L” after entering the DAC value to load the new DAC setting.4. Measure the output power. If the reading is not greater than or equal to the specification forMaximum Output Power, repeat step 3 and increase the DAC value in increments of 50 until themaximum DAC value has been reached. Record the calibrator maximum output power reading inthe Performance Verification Test Data Sheet.5. If Option 12 is installed, repeat steps 2 through 4 with the Calibrator set to 1000 MHz.6. Refer to the Calibrator Troubleshooting section of the manual if the Calibrator does not meet theMaximum Output Power Specification.2.3.2.3 Calibrator Attenuator TestUsing the same test setup in Figure 2-2. Set the Step Attenuator so that the Attenuator is at 0 dBattenuation. Press the REL softkey and set the 8650A to make a relative measurement. Using theHyperTerminal Comm program, type “A” and press enter. Next, enter “0”. Use the attenuator settingsspecified in the Calibrator Attenuator Test section of the Performance Verification Test Data Sheet.Record the relative measurement of the 8650A power meter in the appropriate column and compare tothe specifications.2.3.2.4 Return LossConnect the test setup as shown in Figure 2-4. Set the RF Source frequency to 50 MHz and level to 10dBm. Calibrate the 80501A Directional Bridge to the 8650A Universal Power Meter according tomanufacturer’s specifications.1. Connect the Short supplied with the Directional Bridge and set the meter into relative mode(0 dB).2. Disconnect the Short and connect the 80501A Directional Bridge to the Calibrator. Turn theCalibrator off when performing this measurement.3. Measure and record the absolute value of the reading in the appropriate section of thePerformance Verification Test Data Sheet provided at the end of this chapter.4. If Option 12 is installed, repeat steps 2 through 3 with the RF source set to 1000 MHz.2-8 Manual 32089, Rev. A, December 2000