This subsystem contains commands related to the transfer of trace data to and from the instrument.
:TRACe:PREamble? <trace type>
Title
Returns trace header information for the specified trace. The <trace type> must be one of the following: SPECtrum|PVTime|ACPR|CONStln|SFLatness|EVSCarrier|EVSYmbol
Data can be transferred to and from the 7 available display trace types. Use the commands in the MMEMory subsystem to store and recall traces from the instrument memory. The response begins with an ASCII header. The header specifies the number of following bytes. It looks like #AX, where A is the number of digits in X and X is the number of bytes that follow the header. Parameters are returned in comma-delimited ASCII format. Each parameter is returned as “NAME=VALUE[ UNITS],” Valid parameter names are shown in Table: Available Parameters in WiMAX and Mobile WiMAX Mode (Sheet 1 of 2).
Parameter
<trace type>
Related Command
:TRACe:DATA?
WiMAX, Mobile WiMAX Parameter Names
Available Parameters in WiMAX and Mobile WiMAX Mode (Sheet 1 of 2)
Parameter Name
Description
SN
Instrument serial #
UNIT_NAME
Instrument name
TYPE
The data type (Setup or Data)
DESCR
Trace name
DATE
Trace date/time
BASE_VER
Base FW version
APP_NAME
Application name
APP_VER
Application FW version
APP_MODE
Application Mode
REFERENCE_LEVEL
Reference Level
UNITS
Amplitude units
SCALE
Y axis scale
CENTER_FREQ
Center freq
SIGNAL_STANDARD
Current signal standard (the value is the index of the signal standard list, where a value of 0 is the first index in the list)
CHANNEL
Current channel
POWER_OFFSET
Applied power offset
REFERENCE_FREQUENCY
Selected external reference frequency
UNITS
Amplitude units
CURRENT_VIEW
Current view
CURRENT_MEASURMENTS
Current measurements
DYNAMIC_ATTENUATION
Dynamic range on/off
SPAN
Frequency span
PVT_FRAME_START_TIME
Power vs. Time start time
PVT_FRAME_STOP_TIME
Power vs. Time stop time
BW_SELECT
Current Bandwidth (MHz)
CURRENT_SPECTRUM_VIEW
Current spectrum view (single or multiple channel spectrum)
I_Q_VIEW
IQ view
RUN_HOLD
Run/Hold on/off
TEST_MODEL
Current pass fail model being tested
CP_RATIO
Cyclic Prefix Ratio (the value is the index of the CP Ratio list, where a value of 0 is the first index in the list)
SPECTRUM_SPAN
Spectrum frequency span (the value is the index of the span list, where a value of 0 is the first index in the list
AUTO_SPAN
Auto span on/off
MAX_HOLD
Max hold on/off
EVM_SUB_CARRIER_TOP
Y Axis Max for EVM vs. Symbol/Sub-Carrier
EVM_SUB_CARRIER_SCALE
EVM vs. Symbol/Sub-Carrier scale
SPECTRAL_FLATNESS_SCALE
Spectral Flatness scale
ACPR_DISPLAY_GRAPH
Display ACPR trace on/off
NUM_OF_ACPR_MAIN_CHANNELS
Number of main channels
NUM_OF_ACPR_ADJC_CHANNELS
Number of adjacent channels
CONSTELLATION_REFERENCE_POINTS
Constellation reference points on/off
SPECTRAL_FLATNESS_TOP
Y Axis Max for Spectral Flatness
SPECTRAL_FLATNESS_EVM_SUB_START
Spectral Flatness/EVM vs. sub-carrier start
SPECTRAL_FLATNESS_EVM_SUB_STOP
Spectral Flatness/EVM vs. sub-carrier stop
EVM_SYM_START
EVM vs. Symbol start
EVM_SYM_STOP
EVM vs. Symbol stop
:TRACe[:DATA]? <trace type>
Title
Trace Data Transfer
Description
This command transfers trace data from the instrument to the controller. The <trace type> must be one of the following: SPECtrum|PVTime|CONStln|SFLatness|EVSCarrier|EVSYmbol.
The format of the block data in the query form is specified by :FORMat:DATA. The block data in the command form is always sent in ASCII format. The response begins with an ASCII header that specifies the number of data bytes. It looks like #AX, where A is the number of digits in X and X is the number of bytes that follow the header. Each data-point is separated by a comma delimiter. Trace setup information can be acquired using :TRACe[:DATA]:PREamble?
Use the commands in the MMEMory subsystem to store and recall traces from the instrument memory. Except for CONStln there is only one value per data-point. If max hold is set to ON for SPECtrum and EVM vs. Sub Carrier then the max hold value is returned. For CONStln, each data-point is represented by 3 values 4 bytes each: IData (no units), QData (no units), and the constellation type (no units). For SPECtrum and PVTime unit is in dBm. For Spectral Flatness unit is in dB. For EVM vs Sub Carrier and EVM vs Symbol unit is in percent. Note that the instrument must be set in the selected view. Use the CONFigure command to set the unit to the selected view.