Assessments - 3, GPA: 4
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Autoscale automatically scales the measurement results. • Max/Min: Type in maximum and minimum display value. Use Rescale after changing values. • Rescale: Rescales the measurement results. Markers Screen Options (left): • Markers slider: Moves marker between data points. • Gain: Gain is in dB and is the Gain, measured at the CW frequency for each power level in the power sweep. (Could also be called Gaini compression measurement.) The displayed power in the power of 1 input tone. • Phase: Phase is an AM/PM measurement/display . the phase at the initial power level of the power sweep is used as a normalized level (zero). As the power is swept, the Phase displayed is the difference from the normalized value. ME7840A OMM 5-25 IMD OPERATIONS, MEASUREMENT 5-9 IMD This test measures inter-modulation distortion. Procedure Prepare the ME7840A as shown in Chapter 3. Enter the appropriate test values in the displayed User Input screen. The input fields are described below: • Measurement Type: Already set to “IM” for IMD – input disabled. • Main Tone (MHz): CW Frequency setting for source 1. • Offset (kHz): Offset frequency for Source 2 (Source 2 will be set to Main Tone + Offset). • Input Power (dBm): Input RF power to AUT. • IMD Order:NEED • Test Set Setting: Byte value for setting test set attenuation and source switch: Internal Source Value External Source Value 0dB 8 0dB 0 10 dB 9 10 dB 1 20 dB 10 20 dB 2 30 dB 11 30 dB 3 40 dB 12 40 dB 4 50 dB 13 50 dB 5 60 dB 14 60 dB 6 70 dB 15 70 dB 7 ME 7840A OMM OPERATIONS, MEASUREMENT IMD Select Start Test. Observe that the test screen (Figure 5-7) appears. Figure 5-7. Intermodulation Distortion Test Screen Button Panel Options: • Print: Prints a copy of the screen graphic to a printer. • Write Data: Excel data is written to C:\Program Files\Pats\Datafiles -the file name will have a time stamp. For example: “S17-16-19-29.csv” was created on the 17th day of the month at 4:19 PM and 49 seconds. CSV files are comma separated text and can be opened iin Windows Excel. • Pause/Go: Stops data transfer from VNA to PC and places MS4623C in “Local” mode. ME7840A OMM 5-27 IMD OPERATIONS, MEASUREMENT • Return: Returns to the main PATS screen. • Change Params: Returns to the User Input screen. • Rescale: Rescales the measurement results. • Max/Min: Type in maximum and minimum display value. Use Rescale after changing values. • Autoscale Checkbox: Turns autoscale on or off. Autoscale automatically scales the measurement results. Markers Screen Options (left): • M1-M2 Checkbox: Turns M1-M2 feature on or off. • M1-M2 Readout: Displays the value of M1 minus M2. • M1 Slider: Moves M1 between displayed harmonics. A blue + symbol appears on the top of the selected harmonic. • M2-M1Checkbox: Turns M2-M1 feature on or off. • M2-M1 Readout: Displays the value of M2 minus M1. • M2-M1 Slider: Moves M2 between displayed harmonics. A blue + symbol appears on the top of the selected harmonic. ME 7840A OMM OPERATIONS, MEASUREMENT HARMONICS 5-10 HARMONICS The harmonics test measures and displays the harmonics in the device under test. Procedure Prepare the ME7840A as shown in Chapter 3. Enter the appropriate test values in the displayed User Input screen. The input fields are described below: • Measurement Type: Already set to “HA” for Harmonics – input disabled. • Start Frequency (MHz): Lower frequency to be displayed. Typically set to a value less than or equal to the main tone. • Stop Frequency (MHz): Upper Frequency to be displayed. Set to a value less than the system’s maximum frequency (for example, for MS4623C set to a max of 5000 MHz). • Main Tone (MHz): CW Frequency setting for source 1. • Input Power: Input RF power to AUT. • Test Set Setting: Byte value for setting test set attenuation and source switch: Internal Source Value External Source Value 0dB 8 0dB 0 10 dB 9 10 dB 1 20 dB 10 20 dB 2 30 dB 11 30 dB 3 40 dB 12 40 dB 4 50 dB 13 50 dB 5 60 dB 14 60 dB 6 70 dB 15 70 dB 7 ME7840A OMM 5-29 HARMONICS OPERATIONS, MEASUREMENT Select Start Test and observe that the test screen (Figure 5-8) appears. Figure 5-8. Initial Harmonics Test Screen Button Panel Options: • Print: Prints a copy of the screen graphic to a printer. • Write Data: Excel data is written to C:\Program Files\Pats\Datafiles -the file name will have a time stamp. For example: “S17-16-19-29.csv” was created on the 17th day of the month at 4:19 PM and 49 seconds. CSV files are comma separated text and can be opened iin Windows Excel. • Pause/Go: Stops data transfer from VNA to PC and places MS4623C in “Local” mode. • Return: Returns to the main PATS screen. ME 7840A OMM OPERATIONS, MEASUREMENT HARMONICS • Change Params: Returns to User Input screen. • Autoscale Checkbox: Turns autoscale on or off. Autoscale automatically scales the measurement results. • Max/Min: Type in maximum and minimum display value. Use Rescale after changing values. • Rescale: Rescales the measurement results. Markers Screen Options (left): • M1-M2 Checkbox...