Programming an Output RF Spectrum Measurement

Programming an Output RF Spectrum Measurement for GSM

This section provides an example of how to make the output RF spectrum (ORFS) measurement via GPIB.

The following procedure assumes that an active link is established between the test set and the mobile station. See Establishing an Active GSM Link with the Mobile Station .

1. Configure the ORFS measurement parameters using the SETup subsystem.
2. Start the ORFS measurement using the INITiate subsystem.
3. Use the FETCh? command to obtain ORFS Power measurement results.

 
10  OUTPUT 714;"SETUP:ORFSPECTRUM:CONTINUOUS OFF" !Configures a ORFS measurement
20                                                !to single trigger mode.
30  OUTPUT 714;"SETUP:ORFSPECTRUM:COUNT:STATE ON" !Configures a multi-measurement
40                                                !state to on.
50  OUTPUT 714;"SETUP:ORFSPECTRUM:TRIGGER:SOURCE AUTO" !Configure trigger source
60                                                     !to auto.
70  OUTPUT 714;"SETUP:ORFSPECTRUM:SWITCHING:COUNT:NUMBER 50" !Configures ORFS due
80                                                           !to switching
90                                                           !multi-measurement
100                                                          !count.
110 OUTPUT 714;"SETUP:ORFSPECTRUM:SWITCHING:FREQUENCY 200KHZ,400KHZ" !Configure
120                                                                  !switching
130                                                                  !offsets.
140 OUTPUT 714;"SETUP:ORFSPECTRUM:MODULATION:COUNT:NUMBER 100" !Configure ORFS
150                                                            !due to modulation
160                                                            !multi-measurement
170                                                            !count.
180 OUTPUT 714;"SETUP:ORFSPECTRUM:MODULATION:FREQUENCY 200KHZ" !Configure
190                                                            !modulation offset.
200 OUTPUT 714;"INITIATE:ORFSPECTRUM" !Start ORFS measurement.
210 OUTPUT 714;"FETCH:ORFSPECTRUM:ALL?" !Fetch ORFS results.
220 	ENTER 714;Integrity,Tx_pwr,Max_swit_200,Max_swit_400,Bw_pwr,Avg_mod_200
230 END

Programming Example

 
10  OUTPUT 714;"CALL:POWER:AMPLITUDE -60"
20  OUTPUT 714;"CALL:PDTCH:MSLOT:CONFIG D2U2" ! Configures the multislot
30                                            ! configuration to be
40                                            ! 2 downlink, 2 uplink.
50  OUTPUT 714;"CALL:PDTCH:MS:TXLEVEL:BURST1 5" ! Sets the uplink power for
60                                              ! the first burst.
70  OUTPUT 714;"CALL:PDTCH:MS:TXLEVEL:BURST2 5" ! Sets the uplink power for
80                                              ! the second burst.
90  OUTPUT 714;"RFANALYZER:MSLOT:MEASUREMENT:BURST 2" ! Select to measure the
100                                                   ! second uplink burst in the
110                                                   ! multislot configuration.120 OUTPUT 714;"SETUP:ORFSPECTRUM:CONTINUOUS OFF" !Configures a ORFS measurement
130                                                !to single trigger mode.
140 OUTPUT 714;"SETUP:ORFSPECTRUM:COUNT:STATE ON" !Configures a multi-measurement
150                                               !state to on.
160 OUTPUT 714;"SETUP:ORFSPECTRUM:TRIGGER:SOURCE AUTO" !Configure trigger source
170                                                    !to auto.
180 OUTPUT 714;"SETUP:ORFSPECTRUM:SWITCHING:COUNT:NUMBER 50" !Configures ORFS due
190                                                          !to switching
200                                                          !multi-measurement
210                                                          !count.
220 OUTPUT 714;"SETUP:ORFSPECTRUM:SWITCHING:FREQUENCY 200KHZ,400KHZ" !Configure
230                                                                  !switching
240                                                                  !offsets.
250 OUTPUT 714;"SETUP:ORFSPECTRUM:MODULATION:COUNT:NUMBER 100" !Configure ORFS
260                                                            !due to modulation
270                                                            !multi-measurement
280                                                            !count.
290 OUTPUT 714;"SETUP:ORFSPECTRUM:MODULATION:FREQUENCY 200KHZ" !Configure
300                                                            !modulation offset.
310 OUTPUT 714;"INITIATE:ORFSPECTRUM" !Start ORFS measurement.
320 REPEAT
330   OUTPUT 714;"INITIATE:DONE?" !Check to see if ORFS measurement is done.
340   ENTER 714;Meas_complete$
350 UNTIL Meas_complete$="ORFS" !"ORFS" must be all upper case.
360 OUTPUT 714;"FETCH:ORFSPECTRUM:ALL?" !Fetch ORFS results.
370 ENTER 714;Integrity,Tx_pwr,Max_swit_200,Max_swit_400,Bw_pwr,Avg_mod_200
380 END

Returned values

The measurements returned by this program are:

• Integrity returns the measurement Integrity Indicator (0 means a successful measurement with no errors).
• Tx_pwr returns the transmit power in dBm.
• Max_swit_200,Max_swit_400 returns maximum ORFS power due to switching in dBm (one maximum power level at a 200 kHz offset and one maximum power level at a 400 kHz offset). This result relates to the whole multislot configuration.
• Bw_pwr returns the power level in a 30 kHz bandwidth at zero offset in dBm (this is the reference level for ORFS power due to switching and ORFS power due to modulation).
• Avg_mod_200 returns the average ORFS power due to modulation for the specified burst of the multislot configuration in dBm (one average power level at a 200 kHz offset).

Related Topics

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Output RF Spectrum Measurement Description

SETup:ORFSpectrum

INITiate

FETCh:ORFSpectrum

GPRS Control Program Example

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