Programming a Time Response of Open Loop Power Control (TROLPC) Measurement

General Programming Procedure

1. Prompt the user to connect the access terminal to the test set's front panel RF IN/OUT connector and power it on. Instruct the user that if the access terminal does not automatically open a session, perform whatever actions are necessary to open a session. See Establish a Session from the Access Terminal for more details.
2. Prompt the user to establish an RTAP data connection. See Step 4: Make a connection for more details.
3. Set up the TROLPC measurement parameters as needed using the SETup:TROPower commands.
4. Disable the R-ACK Channel by turning CALL[:CELL]:APPLication:ACKChannel:BFMAttribute[:STATe] to off and setting CALL[:CELL]:APPLication:ATDPackets to 0%.
5. Set cell power using the CALL:POWer command. (Set cell power to -60 dBm/1.23 MHz when performing C.S0033 test 4.3.2).
6. Specify the direction of the step change in cell power using the SETup:TROPower:STEP command. When the measurement is initiated, the test set will change its cell power in the direction indicated by this command.
7. Initiate the TROLPC measurement using the INITiate:<measurement mnemonic>[:ON] command. The <measurement mnemonic> for the TROLPC measurement is TROPower. When the TROLPC measurement is initiated, the test set will change its cell power by 20 dB, and then measure the access terminal power for 100 ms.
8. Use the FETCh:TROPower[:ALL]? command to obtain the measurement results. (You can also replace steps 7 and 8 with a single command - READ:TROPower[:ALL]? ).
9. You must repeat steps 6 - 8 to test each 20 dB step change.
10. A pass or fail indication is returned for each measurement.
11. In addition to retrieving the pass/fail result, you can retrieve data points representing the access terminal output power trace using the FETCh:TROPower:TRACe? command. You can then compare the data points to the equations for the mask (see 4.3.2 Time Response of Open Loop Power Control ) to determine any failure points.

Programming Example: 4.3.2 Time Response of Open Loop Power Control

 
10 ! 4.3.2 Time Response of Open Loop Power Control
20 ! This programming example assumes the access terminal
30 ! is connected to the test set and in a 9.6 kbps
40 ! RTAP data connection.
50 !
60       Testset=714
70 !
80       DISP "Testing Time Response of Open Loop Power Control"
90 !
100 !***Set up test parameters***
110 !
120       Ior=-60
130       ! Start Level for test
140 !
150 !***Set up measurement parameters***
160 !
170       OUTPUT Testset;"SETUP:TROP:TIMEOUT 5"
180       ! Set mesurement timeout to 5 s
190 !
200 !***Set test conditions***
210 !
220       OUTPUT Testset;"CALL:APPLICATION:ACKCHANNEL:BFMATTRIBUTE OFF"
230       ! Turn off ACK Channel Bit Fixed Mode Attribute
240       OUTPUT Testset;"CALL:APPLICATION:ATDPACKETS 0"
250       ! Set AT Directed Packets to 0 to disable R-ACK Channel
260       OUTPUT Testset;"CALL:POW ";Ior
270       ! Set cell power for Test
280       WAIT .1
290       ! Open Loop Time Response settling time after cell power change
300 !
310       CLEAR SCREEN
320       PRINT "Time Response of Open Loop Power Test Results:"
330 !
340       FOR J=1 TO 4
350       ! Loop to measure power after 4 step changes in cell power
360           SELECT J
370           ! Set step direction for each measurement
380           CASE 1
390               Test_number=J
400               Step$="UP20"
410           CASE 2
420               Test_number=J
430               Step$="DOWN20"
440           CASE 3
450               Test_number=J
460               Step$="DOWN20"
470           CASE 4
480               Test_number=J
490               Step$="UP20"
500           END SELECT
510 !
520 !***Obtain measurement results***
530 !
540           OUTPUT Testset;"SETUP:TROP:STEP "&Step$
550           ! Set step direction for measurement
560           OUTPUT Testset;"READ:TROP?"
570           ! Initiate Time Response of Open Loop measurement,
580           ! which automatically induces step change in direction
590           ! set by SETUP:TROP:STEP, then fetch results
600           ENTER Testset;Integrity,Pass_fail
610 !
620           SELECT Pass_fail
630           ! Assign pass/fail results to a string
640           CASE 0
650               Pass_fail$="PASS"
660           CASE 1
670               Pass_fail$="FAIL"
680           CASE ELSE
690               Pass_fail$="ERROR"
700           END SELECT
710 !
720 !***Print measurement results***
730 !
740           PRINT
750           PRINT "Test Number "&VAL$(Test_number)
760           PRINT "Integrity Indicator = ",Integrity
770           PRINT "TROLPC Test Result  = ",Pass_fail$
780 !
790       NEXT J
800 !
810       PRINT
820       PRINT "Test 1 is +20 dB change"
830       PRINT "Test 2 is -20 dB change"
840       PRINT "Test 3 is -20 dB change"
850       PRINT "Test 4 is +20 dB change"
860       PRINT
870       PRINT "Time Response of Open Loop Power Control Test Complete"
880 !
890 !***Post test clean up***
900 !
910       OUTPUT Testset;"INIT:TROP:OFF"
920       ! Turn off measurement
930       OUTPUT Testset;"CALL:APPLICATION:ACKCHANNEL:BFMATTRIBUTE ON"
940       ! Turn ACK Channel Bit Fixed Mode Attribute back on
950       OUTPUT Testset;"CALL:APPLICATION:ATDPACKETS 50"
960       ! Set AT Directed Packets back to default value of 50%
970       OUTPUT Testset;"CALL:POW -55"
980       ! Set cell power back to initial level
990       DISP ""
1000 !
1010       END

Related Topics

Time Response of Open Loop Power Control (TROLPC) Measurement Description

Manual Operation: Measuring Time Response of Open Loop Power Control (TROLPC)

Time Response of Open Loop Power Control Troubleshooting

4.3.2 Time Response of Open Loop Power Control

Programming: Getting Started Guide for 1xEV-DO Terminal Test