IQxel_User Guide

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LitePoint IQxel™For WLAN and BluetoothCopyright © 2012, LitePoint CorporationAll rights reservedRESTRICTED RIGHTS LEGENDNo part of this document may be reproduced, transmitted, transcribed, stored in a retrieval sys-tem, or translated into any language or computer language, in any form or by any means, elec-tronic, mechanical, magnetic, optical, chemical, manual, or otherwise, without the prior written permission of LitePoint Corporation.DISCLAIMERLitePoint Corporation makes no representations or warranties with respect to the contents of this manual or of the associated LitePoint Corporation products, and specifically disclaims any implied warranties of merchantability or fitness for any particular purpose. L itePoint Cor-poration shall under no circumstances be liable for incidental or consequential damages or related expenses resulting from the use of this product, even if it has been notified of the pos-sibility of such damages.If you find errors or problems with this documentation, please notify LitePoint Corporation at the address listed below. LitePoint Corporation does not guarantee that this document is error-free. LitePoint Corporation reserves the right to make changes in specifications and other infor-mation contained in this document without prior notice.TRADEMARKSLitePoint and the LitePoint logo, IQview, IQflex, IQnxn, and IQmax are registered trademarks and IQsignal, IQwave, IQfact, IQcheck, IQdebug, IQmeasure, IQtest, IQexpress, IQultra,IQ201X, IQxstream, TrueChannel, and TrueCable are trademarks of LitePoint Corporation. Microsoft Windows is a registered trademark of Microsoft Corporation in the United States and/or other countries. All trademarks or registered trademarks are owned by their respective owners.CONTACT INFORMATIONLitePoint Corporation575 Maude CourtSunnyvale, CA 94085-2803United States of AmericaTelephone: +1.408.456.5000Facsimile: +1.408.456.01062LITEPOINT TECHNICAL SUPPORT/supportTelephone: +1.408.456.5000Available: weekdays 8am to 6pm, Pacific Standard Time.E-mail: support@Doc: 1075-5038-001Software Release Version 1.5August 2012, Rev.43Safety InstructionsThis symbol means the RESPONSIBLE BODY or OPERATOR should refer to theinstruction manual to preserve the protection afforded by the equipment.Handlingof Equip-mentIf the equipment is used in a manner not specified by the manufacturer,the protection provided by the equipment may be impaired.BatteryWarningThere is danger of explosion if batteries are mishandled or incorrectly replaced. On systems with replaceable batteries, replace only with the same manufacturer and type or equivalent type recommended by themanufacturer per the instructions provided in the product service man-ual. Do not disassemble batteries or attempt to recharge them outside the system. Do not dispose of batteries in fire. Dispose of batteries properly in accordance with the manufacturer’s instructions and local regulations.Recyclingand Dis-posalThis symbol indicates that LitePoint products should be recycled and not be disposed with common unsorted Household or Municipal waste.LitePoint products should be sent to a facility that properly recycles elec-trical and electronic equipment. R esponsible waste collection and recy-cling of electronic products will help protect human health, the environment, and conserve natural resources.4Table of ContentsSafety Instructions4 Getting Started with IQxel10 IQxel Main Window10 Launching an Application10 GPRF11 Vector Signal Analyzer11 Hardware11Hardware Settings11Trigger Settings11 Results12Performing a Signal Measurement12Power Table13I vs. Time Plot13Q vs. Time Plot14Power vs Time15Spectrum15 Settings16FFT Spectrum Measurement16Power Measurement16 Vector Signal Generator17 VSG17Waveforms17 WiFi SISO18 VSA18 Hardware18WiFi SISO Hardware Settings18VSA Settings18Trigger Settings185Impairments19 Results20 WiFi SISO20 Performing a n OFDM Signal Measurement20 Constellation Plot21 Tx Quality Table21 Spectrum Plot22 EVM vs.Subcarrier Plot23 EVM vs. Symbol Plot24 Phase Error vs. Symbol Plot25 Spectral Flatness Plot25 Preamble Frequency Error vs. Time Plot26 CCDF Plot27 Power Vs. Time Plot27I vs. Time Plot28Q vs. Time Plot28 PSD of Phase Error29 Performing a DSSS Signal Measurement30 Constellation Plot31 Tx Quality Table31 Spectrum Plot32 EVM vs. Time Plot33 Frequency Error vs. Time Plot34 Power Vs. Time Plot34I vs. Time Plot35Q vs. Time Plot35 Settings36 WiFi SISO Settings366Standard Selection36 WiFi 802.11 a/g/n/ac for OFDM Analysis36 WiFi b for DSSS Analysis37 VSG39 Hardware39 WiFi SISO Hardware Settings39 VSG Settings39 Waveforms39 WaveGen40 Wave Generation40 File Generation40 Standard Selection40 OFDM Wave Generation Settings41 DSSS Wave Generation Settings42 WiFi MIMO43 VSA43 Hardware43 WiFi MIMO Hardware Settings43 VSA Settings43 Trigger Settings43 Results45 WiFi MIMO45 Performing M IMO Measurements45IQxel Test System Port Configuration45Physical Configuration of MIMO45IQxel GUI MIMO Configuration46Constellation Plot48Tx Quality Table49Tx Quality Avg/Max/Dev Table507Power Table Plot50Spectrum Plot51EVM vs.Subcarrier Plot52EVM vs. Symbol Plot53Phase Error vs. Symbol Plot54Spectral Flatness Plot55Power Vs. Time Plot55 Settings56 WiFi MIMO Settings56 Standard Selection56 WiFi 802.11 a/g/n/ac for OFDM Analysis56 WiFi b for DSSS Analysis57 VSG59 Hardware59 WiFi SISO Hardware Settings59 VSG Settings59 Waveforms59 WaveGen60 Wave Generation60 File Generation60 Standard Selection60 OFDM Wave Generation Settings61 DSSS Wave Generation Settings62 Bluetooth63 VSA63 Hardware63 Bluetooth Hardware Settings63 VSA Settings638Trigger Settings63 Results65 Bluetooth65 Performing a Bluetooth Signal Measurement65Tx Quality Table66Adjacent Channel Power66FM Demodulator Output67Power Vs. Time6820 dB Bandwidth69EDR Symbol Constellation69EDR DEVM Vs. Time70EDR Frequency Error vs. Time Plot71LE Avg. Freq Vs. Time71LE DeltaF2 Max Vs. Time72 Settings73 Bluetooth Analysis Settings73 VSG74 Hardware74 Bluetooth Hardware Settings74 VSG Settings74 Waveforms74 WaveGen74 Wave Generation74 File Generation74 Standard Selection75 PHY Parameters75 LE Packet Settings76 Classic EDR Packet Settings769Getting Started with IQxelIQxel Main WindowThe LitePoint IQxel is used for comprehensive testing of wireless products ranging from WLAN, SISO, MIMO and Bluetooth products. The IQxel Graphical User Interface provides the capability to monitor all aspects of wireless product testing. The main screen of the IQxel application allows you to select the application for testing the various products based on the tech-nology specifications. When you select a task, the user interface for that technology displays and allows you to enter parameters specific to the selected product.The IQxel main screen allows you to monitor the overall performance of the products.The Menu drop-down displays the following application buttons:WiFi SISO—allows you to select options for testing products that comply with 802.11a/b/g/n/ac SISO specifications.WiFi MIMO—allows you to select options for testing products that comply with 802.11a/b/g/n/ac MIMO specifications.Bluetooth—allows you to select options for testing Bluetooth products.Launching an ApplicationTo launch an application, click Menu and select the relevant application button. For example, if you want to launch the 802.11 a/b/g/n/ac application, click 802.11 a/b/g/n/ac button in the main screen. The selected application launches.10GPRFVector Signal AnalyzerHardwareHardware SettingsThe Hardware Settings screen allows you to set the hardware parameters for signal capture. .Parameter DescriptionHardware Resource Drop-down menu to select VSA1 or VSA2 depending on the module you are using to analyze the signal.Frequency Set the center frequency for the VSA module.Reference Level Set the input signal reference level. This value should be set as close to the expected signal peak power level as possible.CaptureLengthSet the length of the signal capture.Sampling Rate Drop-down menu to select the sampling rate for the current active hardware mod-ule.Reset Set-tingsClick Reset Settings to reset the general settings to the default value. Trigger SettingsParameter DescriptionSource Drop-down menu to select the source of the trigger signal.l Free Run – Capture trigger is re-armed continuouslyl Timer – Capture trigger is linked to an internal timerl Video – Capture trigger occurs when an RF signal transition of the configured slope, level, and gap time occurs at basebandl External 1-4 – Capture triggers when a signal transition of the configuredslope is detected on the specified EXT portType This setting applies only to Video and EXT{1:4} trigger sources.l Edge: Edge signal detectionl Level:RF threshold levelEdge This setting applies only to Video and EXT{1:4} trigger sources.l Rising edge signal detection initiates a trigger eventl Falling edge signal detection initiates a trigger eventThreshold Level Sets the RF level threshold for Video trigger source only. Note that this level is rel-ative to the reference level.Mode l Single mode indicates the trigger is armed for a single trigger on the nexttrigger event. l Multiple mode indicates the trigger is automatically re-armed after each triggerevent.Gap Time Sets the time that must elapse after a trigger event before the trigger is re-armed. This field is enabled only when the trigger source is Video or External.Offset Set the amount of time to wait after a trigger event before executing the trigger action. This field is disabled when the trigger source is Free Run.Timeout Time, in ms, set for trigger time out.ResultsPerforming a Signal MeasurementFollow the steps below to perform an GPRF signal measurement:1.Launch the IQxel user interface 2.Click Technology and select GPRF 3.Click VSA 4.Click Hardware 5. In the VSA Settings screen, set the parameters provided in the table below6. In the Trigger Settings screen, set the parameters provided in the table below.SourceSet the source to VIDeo TypeSet the type to Edge EdgeSet Edge to POSitive Threshold LevelSet Threshold Level to -25 dB ModeSet Mode to SSHot Gap TimeSet the Gap Time to 10 µs Offset Set the offset time to -10 µs7. Click Settings8. In the P ower Measurement s creen, set the Filter Type to NONE9. The FFT Spectrum Measurement, set the Resolution Bandwidth to 10010. Click Results11. Drag the Constellation m easurement from the box on the left side of the screen into oneof the display windows12. Click the Continuous Analysis button13. Drag the Power Table m easurement from the box on the left side of the screen into oneof the display windowsPower TableDisplays results of the power measurement per interval.I vs. Time PlotThe figure below displays the In Phase signal amplitude of the specified packet vs. Time plot.Q vs. Time PlotThe figure below displays the Quadrature signal amplitude of the capture segment vs. Time plot.Power vs TimeShows the captured data as power in dBm over time. This plot shows the unprocessed raw cap-tured data over the full capture length.SpectrumDisplays power spectrum density (dBm/RBW) with the configured resolution bandwidth cal-culated over the length specified in the Analysis Results screen.SettingsFFT Spectrum MeasurementThe FFT Spectrum Measurement screen allows you to set the resolution bandwidth for the sig-nal capture.Parameter DescriptionResolution Band-width The resolution bandwidth determines the smallest frequency range that can be resolved.Power MeasurementThe Power Measurement screen allows you to set the signal capture parameters to measure the signal power.Parameter DescriptionFilter Set filter settingsType None - No filteringGAUSS - Gaussian filtering RRC - Root Raised Cosine filterBandwidth Double-sided bandwidth of filterOffset Frequency offset of filterRoll-off Roll-off factor of root-raised-cosine filter. This does not apply to Gaussian filter.Interval Length For interval-based measurements, the capture is divided into intervals of the spec-ified length and the measurements are calculated per interval.MeasurementLengthLength of time over which a measurement is calculated. Vector Signal GeneratorVSGThe VSG screen displays the following items:Frequency Sets the frequency for the VSG module.Power Level Sets the power level of the output signal.Sampling Rate Drop-down menu to select the sampling rate for the current active hardware mod-ule.Reset Settings Click Reset Settings to reset the general settings to the default value. WaveformsLoad Click Load and select a wavefile to load the wavefile from the test system to VSG.Upload Click Upload to load wavefiles from the a source location to the test system and then to the VSG.LoadedWaveDisplays the name of the selected waveform. Stop Stop playing the waveform file.Play Start playing the waveform file.CW VSG modulation is off.Wave VSG modulation is on.RF (on)VSG RF output power is on.RF (off)VSG RF output power is off.WiFi SISOVSAHardwareWiFi SISO Hardware SettingsVSA SettingsThe VSA Settings screen allows you to set the signal capture parameters. Parameter DescriptionHardware Resource Drop-down menu to select VSA1 or VSA2 depending on the module you are using to analyze the signal.Frequency Set the frequency for the VSA module.Reference Level Set the input signal reference level. This value should be set as close to the expected signal peak power level as possible.CaptureLengthSet the length of the signal capture.Sampling Rate Drop-down menu to select the sampling rate for the current active hardware mod-ule.Reset Click Reset to reset the general settings to the default value. AGC Click AGC to perform Automatic Gain Control.Trigger SettingsSource Drop-down menu to select the source of the trigger signal.l Free Run – Capture trigger is re-armed continuouslyl Timer– Capture trigger is linked to an internal timerl Video – Capture trigger occurs when an RF signal transition of the configured slope, level, and gap time occurs at basebandl External 1-4 – Capture triggers when a signal transition of the configuredslope is detected on the specified EXT portType This setting applies only to Video and EXT{1:4} trigger sources.l Edge - Edge signal detection.l Level - RF threshold levelEdge This setting applies only to Video and EXT{1:4} trigger sources.l Positive - rising edge signal detection initiates a trigger event.l Negative - falling edge signal detection initiates a trigger event.Threshold Sets the RF level threshold for Video trigger source only. Note that this level is rel-Level ative to the reference level.Mode l Single mode indicates the trigger is armed for a single trigger on the next trigger event.l Multiple mode indicates the trigger is automatically re-armed after each trigger event.Gap Time For trigger edge= positive or trigger type=level, the time that the signal must stay below the threshold before the trigger is re-armed.For trigger edge=negative, the time that the signal must stay above the threshold before the trigger is re-armed. Trigger edge=negative does not apply for trigger type=level.Offset The amount of time to delay the trigger after the trigger event.A negative value only applies to captures and indicates t he length of pre-trigger d ata to include in the capture.ImpairmentsParameter DescriptionGroup Delay Specifies the Group Delay of the Q Channel in nanoseconds. The default value is zero (0).DC Offset Specifies DC offset in volts. Amplitude Off-setAmplitude imbalance in percent. Phase Offset Phase Imbalance in degrees.ResultsWiFi SISOPerforming a n OFDM Signal MeasurementFollow the steps below to perform an OFDM signal measurement:1. Launch the IQxel user interface2. Click Technology and select WiFi SISO3. Click VSA4. Click Hardware5. In the VSA Settings screen, set the parameters provided in the table below.6. In the Trigger Settings screen, set the parameters provided in the table below.Source Set the source to VIDeoType Set the type to EdgeEdge Set Edge to POSitiveThreshold Level Set Threshold Level to -25 dBMode Set Mode to SSHotGap Time Set the Gap Time to 10 µsOffset Set the offset time to -10 µs7. Click Settings8. In the S tandard Selection screen, select OFDM from the Standard drop down menuand set the following parameters in the 802.11a/g/n/ac section of the screen.Phase Correction Set Phase Correction to OnSymbol Clock Correction Set Symbol Clock Correction to OnAmplitude Correction Set Amplitude Correction to OffFrequency Correction Set Frequency Correction to LTFChannel Estimation Set Channel Estimation to LTFPacket Format Set Packet Format to Auto9. Click Results10. Drag the desired plots from the l eft pane into one of the display windows11. Click the Continuous Analysis buttonNote: The PSDU export button allows you to save the decoded data as a text file.Below is a description of the plots.Constellation PlotThe figure below displays the symbol constellation plot an OFDM signal. Symbol constellation shows the quality of the demodulated data in the complex plane for each symbol in the analyzed frame.Tx Quality TableThe figure below displays the signal quality measurement based on power, EVM, Phase Error etc for an OFDM signal.Spectrum PlotThe measurement bandwidth is 100kHz as specified by the IEEE specification. The plotted frequency range is +/-30MHz for all analysis. Power spectral density plot can be used to display the power spectral density of signals other than 802.11 signals.The figure below displays the spectrum plot for an OFDM signal with a frequency range of +/-30 MHz.The figure below displays the wideband spectrum plot for an OFDM signal with a frequenc range of +/-120 MHz.Note: You must click the Wide button and set the sampling rate to 160 MHz to per-form a wide band capture.EVM vs.Subcarrier PlotThe Error Vector Magnitude (EVM) versus the Sub Carrier Number plot displays the EVM for each subcarrier averaged over all symbols within the data frame. T he figure below displays the EVM Versus Carrier plot for OFDM s ignal. T he plot represents RMS EVM of all active sub-carriers, including data and pilot subcarriers.EVM vs. Symbol PlotThe EVM versus the Symbol plot shows the EVM for each symbol averaged over all sub-car-riers within frame data. The figure below displays a plot for the EVM Versus Symbol Number for OFDM s ignal.Phase Error vs. Symbol PlotThe figure below illustrates the Phase Error vs. Symbol plot for OFDM signal. The data is obtained by calculating the common phase error of the pilot carriers for each OFDM symbol. This measurement is also known as Common Phase Error.Spectral Flatness PlotThe Spectral Flatness shows an estimate based on the long training sequence of the spectral flat-ness of the sub-carrier energies spectrum as compared with the limits imposed by the 802.11 specification.The figure below illustrates the Spectral Flatness graph for OFDM s ignal.Preamble Frequency Error vs. Time PlotThe figure below displays the OFDM Preamble Frequency Error vs. Time plot only on the preamble portion of the signal.CCDF PlotThe CCDF (Complimentary Cumulative Distribution Function) window plots the peak to aver-age power distribution. The horizontal axis plots the power level above the average power level, and the vertical axis plots the probability that the actual power is greater than this amount. The CCDF is only measured over a single packet, so the gap does not contribute to the meas-urement.The blue curve represents the measured signal, and the red curve represents the ideal curve for an OFDM signal. When compared with an ideal curve, it shows that the OFDM signal is sig-nificantly affected by the signal compression.Power Vs. Time PlotThe figure below displays the Power vs. Time plot for an OFDM signal.I vs. Time PlotThe figure below displays the In Phase signal amplitude of the specified packet vs. Time plot for an OFDM signal.Q vs. Time PlotThe figure below displays the Quadrature signal amplitude of the capture segment vs. Time plot for an OFDM signal.PSD of Phase ErrorThe figure below displays the Phase Error (PSD) plot for an OFDM signal. It is derived by cal-culating the PSD of the Phase Error (Time) data.The PSD of Phase Error plot analyzes phase versus frequency and plots the estimated PSD of the synthesizer measured during the burst. This data is derived by calculating the PSD of the esti-mated phase errors per symbol.Note: The lower limit of the frequency range is determined by the number of OFDM symbols available for estimation and can be lowered by increasing the number of symbols.Performing a DSSS Signal MeasurementFollow the steps below to perform a measurement:1. Launch the IQxel user interface2. Click Technology and select WiFi SISO3. Click VSA4. Click Hardware5. In the VSA Settings screen, set the parameters provided in the table below6. In the Trigger Settings screen, set the parameters provided in the table below.Source Set the source to VIDeoType Set the type to EdgeEdge Set Edge to POSitiveThreshold Level Set Threshold Level to -25 dBMode Set Mode to SSHotGap Time Set the Gap Time to 10 µsOffset Set the offset time to -10 µs7. Click Settings8. In the S tandard Selection screen, select DSSS from the Standard drop down menu andset the following parameters in the 802.11b section of the screen.EVM Method In the EVM drop-down menu, select StandardEqualizer Taps In the Equalizer Taps drop-down menu, select OFFDC Removal Set DC Removal to Off9. Click Results10. Drag the desired plots from the l eft pane into one of the display windows11. lick the Continuous Analysis buttonNote: The PSDU export button allows you to save the decoded data as a text file.Below is a description of the plots.Constellation PlotThe figure below displays the symbol constellation plot for DSSS s ignal. Symbol constellation shows the quality of the demodulated data in the complex plane for each symbol in the analyzed frame.Tx Quality TableThe figure below displays the signal quality measurement based on power, EVM, Phase Error etc for a DSSS signal.Spectrum PlotThe measurement bandwidth is 100kHz as specified by the IEEE specification. The plotted bandwidth stays +/-30MHz for all analysis. Power spectral density plot can be used to display the power spectral density of signals other than 802.11 signals.The figure below displays the spectrum plot for an OFDM signal with a frequency range of +/-30 MHz.The figure below displays the wideband spectrum plot for an OFDM signal with a frequenc range of +/-120 MHz.Note: You must click the Wide button and set the sampling rate to 160 MHz to per-form a wide band capture.EVM vs. Time PlotThe figure below displays the EVM versus time for a DSSS s ignalFrequency Error vs. Time PlotThe figure below displays the Frequency vs. Time plot for a DSSS s ignal.Power Vs. Time PlotThe figure below displays the Power vs. Time plot for a DSSS signal.I vs. Time PlotThe figure below displays the In Phase signal amplitude of the specified packet vs. Time plot for a DSSS signal.Q vs. Time PlotThe figure below displays the Quadrature signal amplitude of the capture segment vs. Time plot for a DSSS signal.SettingsWiFi SISO SettingsSettings allows you to set some of the hardware settings of the VSA/VSG, such as phase and frequency correction and all of the analysis parameters to be used by the VSA when measuring the DUT that is connected to the IQxel test system.Standard SelectionThe Standard Selection drop-down menu allows you to select the IEEE 802.11 standard for analysis.Available options are as follows:l DSSSl OFDMWiFi 802.11 a/g/n/ac for OFDM AnalysisThe table below shows settings for the IEEE 802.11 a/g/n/ac standards.Phase Cor-rection On—Enables phase correction options for analysis.Off—Disable phase correction for analysis. Can be used when the carriers and ref-erences of the transmitter and receiver are phase-locked or when low-frequency car-rier phase noise could be present.Symbol Clock Cor-rectionOn—Enables symbol clock correction options for analysis.Off—Disables symbol clock correction options for analysis.Amplitude Correction On—Enables amplitude correction options for analysis.Off—Disables amplitude correction options for analysis.Frequency CorrectionDrop-down menu to select the carrier frequency error estimation method.Available option to select section of waveform:LTF—Long Training Field SIG—SignalDATA—DataChannel Estimation Drop-down menu to select channel estimation method.Available option to select section of waveform:LTF—Long Training FieldDATA—DataPacket Format Auto—NONHt—packets transmitted in legacy-compatible formatMIXed—packets transmitted with preamble compatible with legacy 802.11 GREenfield—high-throughput packets transmitted without legacy compatible part VHT—very high throughput packets transmittedWiFi b for DSSS AnalysisThe table below shows settings for the IEEE 802.11 b standards.Equalizer Taps Drop-down menu to select equalizer tapsAvailable option to select are as follows:OFF—Equalizer tap is turned offTAP5—5-tap frequency domain equalizer; use this setting when the performance of a transmitter and receiver pair with matching filters is to be assessed.TAP7—7-tap frequency domain equalizerTAP9—9-tap frequency domain equalizerOFF---Recommended SettingThe larger the number of taps, the more the equalizer can correct for Inter Symbol Interference (ISI) present in the transmitter. If the EVM improves substantially when changing from 5 to 9 Taps, the transmitter is likely to have too much ISI. Note: If you use the 11b Std. Tx mod acc, option for EVM Calculation, then you must set the Equalizer Taps to Equalizer Off.DC Removal On—Enables DC Removal options for analysis; use only if the DC Offsets are known to be substantial relative to the desired signal level. This can be the case if the RF signal level is extremely low, or if there is a DC present when using the baseband inputs.Off—Disables DC Removal options for analysis ; recommended setting.EVM Method Drop-down menu to select the EVM method.Available option to select are as follows:Standard—The 11b Standard Transmit Modulation Accuracy method applies the algorithm defined in IEEE 802.11b-1999 Standard Section 18.4.7.8 to the sam-pled data after carrier and symbol timing recovery.RMS—The RMS error vector method applies the standard rms error vector algo-rithm1VSGHardwareWiFi SISO Hardware SettingsVSG SettingsThe VSG Settings screen allows you to set the signal capture parameters. Parameter DescriptionVSG Drop-down menu to select VSG1 or VSG2 depending on the module you are using to generate the signal.Frequency Set the frequency for the VSA module. PowerLevelDownlink signal power level.Sampling Rate Drop-down menu to select the sampling rate for the current active hardware mod-ule.Reset Click Reset to reset the general settings to the default value.WaveformsLoad Click Load and select a wavefile to load the wavefile from the test system to VSG.Upload Click Upload to load wavefiles from the a source location to the test system and then to the VSG.LoadedWaveDisplays the name of the selected waveform. Stop Stop playing the waveform file.Play Start playing the waveform file.CW VSG modulation is off.Wave VSG modulation is on.RF (on)VSG RF output power is on.RF (off)VSG RF output power is off.。