Programming an Uplink Multi-Tone Audio Measurement

Last updated: December 3, 2008

This measurement is not applicable to GPRS or EGPRS.

This section provides an example of how to use the Multi-tone Audio instrument via the GPIB to perform measurements on a mobile station's microphone.

The following procedure assumes that a mobile station is connected to the test set's RF IN/OUT and that the mobile station's microphone is connected to the AUDIO OUT BNC connector. See Multi-tone Audio Measurement Description .

Set the traffic channel speech type to None.
Configure the multi-tone audio measurement for measuring the frequency response and absolute audio level of the mobile station's speaker. The SETup subsystemis used for configuring parameters. Parameters that must be configured include:
- Measurement Mode - must be set to Uplink.
- SINAD/Distortion State - must be turned off to capture frequency response results.
- Generator's Total Audio Level - should be set as high as possible. This setting is dynamic and varies depending on the generator frequencies selected.
Other parameters can also be configured as illustrated in the following programming example. See Measurement Parameters for more information.
Start the multi-tone measurement using the INITiate subsystem.
Use the FETCh? subsystem to obtain multi-tone audio measurement results.
Reconfigure the multi-tone audio measurement for performing a SINAD/Distortion measurement.
- SINAD/Distortion State - turn the state on so SINAD and Distortion measurement results will be available.
- Generator Preset Frequencies - a preset with audio tone one turned on and all other tones turned off must be used for SINAD/Distortion measurements.
Start the multi-tone measurement again using the INITiate subsystem.
Use the FETCh? subsystem to obtain multi-tone audio SINAD/Distortion measurement results.

Programming Example

 
1 ! String to hold data for MTA uplink upper Limits
2 DIM UL$[100] 
3 ! String to hold data for MTA uplink lower Limits
4 DIM LL$[100
5 ! Arry to hold MTA measurement results 
6 !   including integrity indicator
7 DIM Mta_levels(20) 
8 !  
9 !*** Define Pass Fail Limits for all 20 tones ***
10 !
11 UL$="-8,-8,-8,-7,-7,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6"
12 LL$="-12,-12,-12,-11,-11,-10,-10,-10,-10,-10,-10,-11,-11,-11,-13,-13,-13,-16,-16,-18"
13 !
14 !
15 OUTPUT 714;"SETUP:MTA:LEVEL:ALL:LIMIT:UPPER "&Mta_uplink_ul$
16 OUTPUT 714;"SETUP:MTA:LEVEL:ALL:LIMIT:LOWER "&Mta_uplink_ll$
17 !
18 !
19 !*** multi-tone audio measurement setup ***
20 !
21 !UPLINK MEASUREMENT MODE
22 OUTPUT 714;"SETUP:MTAUDIO:MEAS:MODE UPLINK'
23 OUTPUT 714;"CALL:TCH:DOWNLINK:SPEECH NONE"
24 !SET SINAD DISTORTION STATE TO OFF
25 OUTPUT 714;"SETUP:MTAUDIO:SDIS:STATE 0'
26 OUTPUT 714;"SETUP:MTAUDIO:COUNT 20"   !averaging of 20
27 OUTPUT 714;"SETUP:MTAUDIO:SETT .1"   !SETTLING TIME OF .1 SECONDS
28 !PRESET 100 HZ SPACING
29 OUTPUT 714;"SETUP:MTAUDIO:GEN:FREQ:PRESET MTA100"   
30 !TOTAL GENERATOR LEVEL in V
31 OUTPUT 714;"SETUP:MTAUDIO:GEN:LEVEL:UPLINK:ALL:TOTAL 1.2"  
32 !
33 OUTPUT 714;"SETUP:MTAUDIO:REF:ABS:LEVEL:UPLINK 7"
34 !
35 !*** Multi-tone audio individual 20 tone level measurements
36 !
37 OUTPUT 714;"INIT:MTA"
38 !
39 OUTPUT 714;"FETCH:MTA:LEVEL?"
40 ENTER 714;Mta_levels(*)
41 !
42 OUTPUT 714;"FETCH:MTA:INTEGRITY?"
43 ENTER 714;Integrity
44 !
45 OUTPUT 714;"FETCH:MTA:VOLTAGE?"
46 ENTER 714;Uplink_volts
47 !
48 OUTPUT 714;"FETCH:MTA:LEVEL:LIMIT:FAIL?"
49 ENTER 714;Pass_fail
50 !
51 SELECT Pass_fail
52 !
53  Case 0
54    Pass_fail$ = "Passed"
55  Case 1
56    Pass_fail$ = "Failed"
57  Case Else
58    Pass_fail$ = "Unknown"
59 End Select
60 !
61 !*** UpLink Distortion Test
62 !
63 OUTPUT 714;"SETUP:MTAUDIO:COUNT 1"   !averaging of 3
64 !SET SINAD DISTORTION STATE TO ON
65 OUTPUT 714;"SETUP:MTAUDIO:SDIS:STATE 1"   
66 !PRESET SINE 1000 HZ SINGLE TONE
67 OUTPUT 714;"SETUP:MTAUDIO:GEN:FREQ:PRESET SIN1000"   
68 !TOTAL GENERATOR LEVEL
69 OUTPUT 714;"SETUP:MTAUDIO:GEN:LEVEL:UPLINK:ALL:TOTAL 1"  
70 OUTPUT 714;"SETUP:MTAUDIO:REF:ABS:LEVEL:UPLINK 15"
71 !
72 OUTPUT 714;"INIT:MTA"
73 !
74 OUTPUT 714;"FETCH:MTA:DISTORTION?;SINAD?;VOLTAGE?"
75 ENTER 714;Uplink_dist,Uplink_sinad,Dist_volts
76 !
77 !*** Print Results ***
78 !
79 Print
80 Print_title ("MultiTone Audio Uplink Test")
81 Print_results("Channel= ",Current_chan,"")
82 Print
83 !
84 Print_results("Integrity indicator = ",Integrity,"")
85 Print
86 Print_results("Uplink Audio Level =",Uplink_volts," %")
87 Print
88 !
89 For I = 1 To 20
90   Print_results("Tone "&VAL$(I),Mta_levels(I)," dB")
91 Next I
92 !
93 !
94 Print_res_str("Test Result: ",Pass_fail$)
95 Print
96 !
97 Print_results("Uplink Distortion 1000 Hz =",Uplink_dist," %")
98 Print_results("Uplink SINAD 1000 Hz =",Uplink_sinad," dB")
99 Print_results("Uplink Level 1000 Hz =",Dist_volts," %")

Programming an Uplink Multi-Tone Audio Measurement

Programming Example

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