Last Updated: August 29, 2007
How are the Measurements in the Power and Modulation Quality Measurement Suite Made?
Power and Modulation Quality Measurement Suite Measurement Parameters
Power and Modulation Quality Measurement Suite Results Configuration Parameters
RF Analyzer Settings that Affect the Power and Modulation Quality Measurement
The Power and Modulation Quality measurement suite contains a collection of measurements which are all made using the same set of signal samples. The following measurements are included in the Power and Modulation Quality measurement suite:
Transmit Power (see Transmit Power (TXP) Measurement Description)
Power versus Time (see GSM Power versus Time (PVT) Measurement Description or GPRS and EGPRS Power versus Time (PVT) Measurement Description)
Modulation Accuracy (see Modulation Accuracy (MACC) Measurement Description)
The settings of the RF Analyzer have a significant impact on the Power and Modulation Quality measurement suite, click here for more information.
This parameter sets the burst synchronization mode for the Power and Modulation Quality measurement suite. Note, if EGPRS is set on in the RF Analyzer the only available choice is Midamble.
SCPI command: SETup:PMODulation:SYNC[?]
This parameter sets the bandwidth for the Power versus Time measurement in the Power and Modulation Quality measurement suite.
SCPI command: SETup:PMODulation:PVTime:BWIDth[?]
This parameter sets the multi-measurement count for the Power and Modulation Quality measurement suite.
SCPI command: SETup:PMODulation:COUNt[:SNUMber][?]
This parameter sets the trigger state to single trigger mode or continuous trigger mode for the Power and Modulation Quality measurement suite.
SCPI command: SETup:PMODulation:CONTinuous[?]
This parameter sets the trigger source for the Power and Modulation Quality measurement suite.
SCPI command: SETup:PMODulation:TRIGger:SOURce[?]
This parameter sets the trigger delay for the Power and Modulation Quality measurement suite.
SCPI command: SETup:PMODulation:TRIGger:DELay[?]
This parameter sets the trigger qualifier for the Power and Modulation Quality measurement suite.
SCPI command: SETup:PMODulation:TRIGger:QUALifier[?]
This parameter sets the timeout value in seconds for the Power and Modulation Quality measurement suite.
SCPI command: SETup:PMODulation:TIMeout[:STIMe][?]
For an 8PSK burst, this parameter sets whether the measured power is based on the estimated carrier power or the average power during the useful part of the burst. For a GMSK burst, this parameter has no effect.
SCPI command: SETup:PMODulation:TXPower:METHod[?]
This parameter sets the confidence level (in %) with which to end the measurement early. This level applies to the phase and frequency error's RMS Phase Error, Peak Phase Error, and the Frequency Error. This parameter is only used if the only measurement turned on in the Power and Modulation Quality suite is GMSK Phase and Frequency Error.
SCPI Command: SETup:PMODulation:MACCuracy:PFERror:CONFidence[:SLEVel][?]
This parameter sets the RMS phase error limit (in degrees) for the phase and frequency error measurement.
SCPI command: SETup:PMODulation:MACCuracy:PFERror:RMS[:LIMit][?]
This parameter sets the peak phase error limit (in degrees) for the phase and frequency error measurement.
SCPI command: SETup:PMODulation:MACCuracy:PFERror:PEAK[:LIMit][?]
This parameter sets the frequency error limit (in ppm) for the phase and frequency error measurement.
SCPI command: SETup:PMODulation:MACCuracy:PFERror:FERRor[:LIMit][?]
This parameter sets how the measurement performs demodulation of the tail and guard bits. It affects only phase and frequency error measurements. When set to:
Optimal, the tail and guard bits are adjusted to values that minimize the phase error on the tail bits.
ETSI, the tail and guard bits are ETSI compliant. That is, all the tail bits are set to zero and all the guard bits are set to one, rather than using the demodulated values.
SCPI command: SETup:PMODulation:MACCuracy:TBDemod
This parameter sets the RMS error vector magnitude limit (in %) for 8PSK bursts. This parameter has no effect on the results of GMSK bursts.
SCPI command: SETup:PMODulation:MACCuracy:EVM:RMS[:LIMit][?]
This parameter sets the percentile limit for 8PSK bursts. This parameter has no effect on the results of GMSK bursts.
SCPI command: SETup:PMODulation:MACCuracy:EVM:PERCentile[:LIMit][?]
This parameter sets the peak error vector magnitude limit (in %) for 8PSK bursts. This parameter has no effect on the results of GMSK bursts.
SCPI command: SETup:PMODulation:MACCuracy:EVM:PEAK[:LIMit][?]
This parameter sets the frequency error limit (in ppm) for 8PSK bursts. This parameter has no effect on the results of GMSK bursts.
SCPI command: SETup:PMODulation:MACCuracy:EVM:FERRor[:LIMit][?]
This parameter sets the origin offset limit (in dB) for 8PSK bursts. This parameter has no effect on the results of GMSK bursts.
SCPI command: SETup:PMODulation:MACCuracy:EVM:OOFFset[:LIMit][?]
This parameter sets the amplitude droop calculate state for 8PSK modulation accuracy measurements.
When set to:
ON, amplitude droop is determined (as an estimated parameter) and removed from the signal in the measurement of RMS EVM and other parameters. This is the method of EVM measurement defined in GSM release 1999. The amplitude droop measurement results are made available, even though amplitude droop is not currently specified.
OFF, amplitude droop is neither determined (as an estimated parameter) nor removed from the signal in the measurement of RMS EVM and other parameters. NaN is returned for all amplitude droop measurement results.
SCPI command: SETup:PMODulation:MACCuracy:EVM:DROop:STATe[?]
This parameter sets the IQ imbalance calculate state for 8PSK modulation accuracy measurements.
When set to:
OFF, IQ amplitude and phase imbalances are neither determined (as estimated parameters) nor removed from the signal in the measurement of RMS EVM and other parameters. This is the method of EVM measurement defined by the standards. NaN is returned for all IQ Imbalance measurement results.
ON, IQ amplitude and phase imbalances are determined (as estimated parameters) and removed from the signal in the measurement of RMS EVM and other parameters. IQ Imbalance measurement results are made available. This feature provides you with a way to perform IQ modulator tuning.
SCPI command: SETup:PMODulation:MACCuracy:EVM:IQIMbalance:STATe[?]
Burst 1 and Burst 2 Power versus Time Measurement Offsets
These parameters set the time offsets for the specified burst of the multislot configuration) for the power vs time power measurement (not the mask measurement).
All 12 time offsets for each burst are set to on by default. These values are referenced to the occurrence of bit 0 in a normal burst.
SCPI Command: SETup:PMODulation:PVTime[:BURSt([1]|2)]:TIME[:OFFSet][?]
This parameter sets the type of mask to be used for the specified burst in the single slot or multislot configuration.
Setting this parameter to:
ETSI selects the appropriate ETSI compliant mask for the specified burst.
Custom 1 selects the user-defined CUSTOM1 mask for the specified burst.
Custom 2 selects the user-defined CUSTOM2 mask for the specified burst.
No Mask disables mask checking for the specified burst.
Note that if you want to use a custom mask, you need to configure the mask settings before use.
SCPI command: SETup:PMODulation:PVTime[:BURSt([1]|2)]:MASK[:SOURce][?]
This parameter sets the guard period mask type for Power versus Time measurements.
SCPI command: SETup:PMODulation:PVTime[:BURSt]:MASK:GPERiod[?]
This parameter sets the mask specification used for the PCS band in the active (that is the selected) format. ETSI define a relaxed mask specification for the PCS band in 3GPP 51.010-1 section 13.3.5(c).
SCPI command: SETup:PMODulation:PVTime:LIMit:ETSI:PCS[?]
This parameter sets which of the two custom masks you want to set the limits for. Once you select the mask you can then view and edit that mask in the table.
There is no SCPI command directly associated with this parameter. The mask is specified within the commands used to set the limits, that is either, SETup:PMODulation:PVTime:CUSTom([1]|2):MASK:LOWer[:VAlues][?] or SETup:PMODulation:PVTime:CUSTom([1]|2):MASK:UPPer[:VAlues][?].
This parameter sets the custom guard period level in dBc relative to the previous burst's carrier power level.
SCPI command: SETup:PMODulation:PVTime[:BURSt]:MASK:GPERiod:CUSTom:RPRevious[?]
This parameter sets the custom guard period level in dBc relative to the next burst's carrier power level.
SCPI command: SETup:PMODulation:PVTime[:BURSt]:MASK:GPERiod:CUSTom:RNEXt[?]
These parameters set the upper limits for the custom mask to be used with the Power versus Time measurement.
SCPI command: SETup:PMODulation:PVTime:CUSTom:MASK:UPPer[?]
These parameters set the lower limits for the custom mask to be used with the Power versus Time measurement.
SCPI command: SETup:PMODulation:PVTime:CUSTom:MASK:LOWer[?]
There are softkeys available to use with the custom masks:
Sort
Custom Masks
This softkey arranges the custom mask values by time.
Copy
Current ETSI to Custom
This softkey sets the custom masks to be the same as the ETSI mask
would be for the current test set configuration.
Disable
Current Mask Level Setting
This softkey disables the currently selected mask level. To disable
the level you must select the dBc or dBm value first, then select this
softkey.
The parameters on the Results Configuration tab allow you to configure the following attributes of the Power and Modulation Quality measurement suite on the front panel:
Enable or disable different measurement result views.
Select whether or not to show each measurement result view on the Summary tab.
Select the order for displaying each measurement result view on the Summary tab.
Select which measurement result views should be expanded on individual tab pages.
Refer to the following individual sub-measurement result descriptions:
The Power and Modulation Quality measurement suite will complete and meet its measurement accuracy specifications when the signal meets the following input signal conditions:
Transmit Power measurement:
Level is between -40 dBm and +33 dBm
Level is within ±3 dB of the expected input level
Frequency is within ±100 kHz of expected input frequency
Power versus Time and Transmit Power measurements:
Level is between -15 dBm and +33 dBm
Level is within ±3 dB of the expected input level
Frequency is within ±10 kHz of expected input frequency
Modulation Accuracy measurement:
Level is between -15 dBm and +33 dBm
Level is within ±3 dB of the expected input level
Frequency is within ±100 kHz of expected input frequency
Triggering choices available for the Power and Modulation Quality measurement suite are Immediate, Rise, and External.
The settings of the RF Analyzer have a significant impact on the Power and Modulation Quality measurement suite. The following list details how each RF Analyzer setting affects the measurement.
This parameter affects the PvT ETSI mask. Even when the Frequency Control Mode is set to Manual, this parameter still affects the PvT ETSI mask. For additional information on this parameter refer to Band in the RF Analyzer topic.
This parameter affects the PvT ETSI mask. Even when the Power Control Mode is set to Manual, this parameter still affects the PvT ETSI mask. For additional information on this parameter refer to MS TX Level in the RF Analyzer topic.
This parameter sets how many bursts are being transmitted and consequently how many bursts are measured. For additional information on this parameter refer to Uplink Bursts in the RF Analyzer topic.
This parameter sets the burst type expected and affects midamble synchronization. For additional information on this parameter refer to Expected Burst Type in the RF Analyzer topic.
This parameter sets the test set to expect both GMSK and 8PSK bursts, or only GMSK bursts. When this state is set to ON, the Power and Modulation Quality measurement suite's Burst Synchronization is automatically set to Midamble. For additional information on this parameter refer to EGPRS in the RF Analyzer topic.
This parameter sets which burst modulation type to measure, either GMSK or 8PSK. When either Burst 1 or Burst 2 is set to 8PSK, EGPRS is set to ON and the Power and Modulation Quality measurement suite's Burst Synchronization is set to Midamble. For additional information on this parameter refer to Modulation Type in the RF Analyzer topic.