Programming a Digital Average Power Measurement

Last updated: October 28, 2004

This section provides an example of how to make a digital average power measurement via GPIB.

The following program example assumes that the mobile station's antenna output is connected to the RF IN/OUT connector, and the mobile station has found service.

For information on configuring the test set for a call, see Step 4: Make a connection .

The basic procedure to measure digital average power is as follows:

Make a call.
Configure the digital average power setup parameters using the SETup:DAPower subsystem.
Start the digital average power measurement using the INITiate subsystem.
Use the FETCh:DAPower command to obtain the measurement results.

Programming Example

 
10    RE-SAVE "c:\roadhog\programs\avg_pwr.txt"
20    !This program measures average power
30    !Refer to "Maximum RF Output Power" in TIA/EIA-98-D for standards and specifications
40    CLEAR SCREEN
50    A=714
60    !
70    !***Specify call parameters***
80    Systype$="DIGITAL2000" !Cell System Type
90    Band$="USCellular" !Cell band
100   Channel=384 !RF channel
110   Sid=1 !System Identification
120   Nid=1 !Network Identification
130   Radio_config$="F3R3" !Radio Configuration
140   Service_opt$="SO2" !Service Option
150   !
160   !***Specify test parameters***
170   Loss_frequency$="836 MHZ,881 MHZ" !Reverse channel, forward channel frequencies for
amplitude offset (path loss)
180   Expected_loss$="-1,-1" !Path loss at reverse channel, forward channel frequencies
190   Ior=-104 !Cell Power
200   Pilot=-7 !Pilot channel power level
210   Traffic=-7.4 !Traffic channel power level
220   !
230   ON TIMEOUT 7,20 CALL Timeout ! Calls "Timeout" routine
240   OUTPUT A;"SETUP:DAPOWER:TIMEOUT:STIME 10 S" !***Sets average power measurement timeout to 10 seconds***
250   OUTPUT A;"SYST:COMM:GPIB:DEB:STAT ON"!***Turn debug state on***
260   !
270   !***Set up path loss***
280   OUTPUT A;"SYSTEM:CORRECTION:SFREQUENCY ";Loss_frequency$ !Enters frequencies in Amplitude Offset table
290   OUTPUT A;"SYSTEM:CORRECTION:SGAIN ";Expected_loss$ !Enters loss values in Amplitude
Offset table
300   !
310   !***Set up call parameters***
320   OUTPUT A;"CALL:OPER:MODE CALL" !***Sets Operating Mode to Active Cell***
330   OUTPUT A;"CALL:SYSTEM ";Systype$ !Sets System Type
340   OUTPUT A;"CALL:BAND ";Band$ !Sets Cell band for selected System Type
350   OUTPUT A;"CALL:CHAN ";Channel !Sets Channel for selected System Type and Cell Band
360   OUTPUT A;"CALL:POW -50" ! Sets and turns on Cell Power for selected System Type
370   OUTPUT A;"CALL:SID ";Sid ! Sets System Identification
380   OUTPUT A;"CALL:NID ";Nid ! Sets Network Identification
390   OUTPUT A;"CALL:RCON ";Radio_config$ !Sets Radio configuration
400   OUTPUT A;"CALL:SOPTION ";Service_opt$ !Sets service option for the selected System Type
and Radio Configuration
410   OUTPUT A;"CALL:PROT:DIG2000 PREV6" ! Sets Protocol Revision for the selected System Type
420   OUTPUT A;"CALL:PAG:DRAT FULL" !Sets F-Paging data rate to full rate
430   OUTPUT A;"CALL:PIL -7"   !Sets pilot to default
440   OUTPUT A;"CALL:SYNC -16" !Sets sync to default
450   OUTPUT A;"CALL:PAG -12"  !Sets paging to default
460   OUTPUT A;"CALL:FCH -15.6"!Sets traffic to default
470   !
480   PRINT "Turn on mobile station...press continue when it has found service and registered"
490   PAUSE
500   CLEAR SCREEN
510   OUTPUT A;"CALL:REGISTER:TIMER:STATE OFF" !Turns timer-based registration off
520   WAIT 2 !Waits 2 seconds for timer-based registrations in progress to clear out
530   !
540   !***Page the mobile station***
550   DISP "Paging mobile station..."
560   OUTPUT A;"CALL:ORIG" !Pages the mobile station
570   OUTPUT A;"CALL:CONNECTED:STATE?" !Queries for connected/idle state...hangs until state
change detector is disarmed
580   ENTER A;Call_connected
590   IF NOT Call_connected THEN
600     DISP "Call attempt failed"
610     STOP
620   ELSE
630     DISP "Call connected"
640   END IF
650   !
660   !***Set up measurement parameters***
670   OUTPUT A;"SETUP:DAPOWER:CONTINUOUS OFF" !Sets trigger arm state to single
680   OUTPUT A;"CALL:POW ";Ior !Sets Cell Power for the selected System Type
690   OUTPUT A;"CALL:CLPCONTROL:REVERSE:MODE UP" !Starts transmission of All Up (0) power
control bits
700   OUTPUT A;"CALL:PIL ";Pilot !Sets pilot channel level
710   OUTPUT A;"CALL:FCH ";Traffic !Sets traffic channel level
720   !
730   !***Obtain measurement results***
740   WAIT 1 !Settling time
750   OUTPUT A;"INITIATE:DAPOWER" !Initiates an Average Power measurement
810   OUTPUT A;"FETCh:DAPOWER?"
820   ENTER A;Integrity,Avg_power_dbm
830   Avg_power_dbw=Avg_power_dbm-30
840   !
850   !***Display measurements if the mobile station did not drop the call***
860   OUTPUT A;"CALL:STATUS?"
870   ENTER A;Call_status$
880   IF Call_status$="CONN" THEN
890     PRINT "Integrity indicator = ";Integrity
900     PRINT "Maximum power = ";Avg_power_dbm;"dBm";", ";Avg_power_dbw;"dBW"
910   ELSE
920     PRINT "Mobile station dropped call, invalid results"
930   END IF
940   !
950   !***Return to default call processing states***
960   OUTPUT A;"CALL:CLPCONTROL:REVERSE:MODE ACTIVE" ! Returns to active power control bits
970   OUTPUT A;"CALL:POW:DIG2000 -50" ! Returns cell power to -50 dBm/1.23 MHz
980   !
990   DISP "Test complete"
1000  OUTPUT A;"CALL:END"
1010  END
1020 Timeout: SUB Timeout
1030    PRINT "Program timed out"
1040    CLEAR 7
1050    CLEAR 714
1060  SUBEND

Returned Values

This program returns an integrity indicator followed by a digital average power measurement result (if results are available).

Programming a Digital Average Power Measurement

Programming Example

Returned Values

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