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>@9

Multitone Audio Test System

User Manual

V 3.32 

 

31 / 71 

Obviously, to get a true SINAD result, it is necessary to stimulate the DUT with a single sine 
tone only. Otherwise, i.e. if a multitone signal is applied, intermodulation products would 
appear, thus increasing the 

Noise+Distortion value. Nevertheless, it is also possible to 

calculate the SINAD result out of a transmitted multitone signal. However, in order to avoid 
misunderstandings, this result is called MT-SINAD herein. 
Actually, with 

>@9

, just use the query command 

MEASurement[1¦2]:MTSinad?

, to get the 

calculated value. 
 
In practice, the MT-SINAD result may differ slightly from a conventionally measured SINAD 
value, due to intermodulation products between the signal bins. However, in qualitative 
terms, the results are equal as proven in numerous setups. 
 

RSS Selective Measurement 

The 

 

MEASurement[1-2]:SELectiverss? <binstart> 

<binstop> command allows to query the TD+N 

result of a user-defined band anywhere between 20Hz and 20kHz. Both the lower and the 
upper border of this band may be set freely to any bin number - they don’t have to be 
identical to the signal bins of the transmitted multitone signal. 

Frequency [Hz]

Bin_Start

Bin_Stop

Amplitude

Signal

Bin 1

Signal

Bin 2

Signal

Bin 3

Bin

Max

Bin

Min

 

Fig. 21   RSS Selective Plot 

 

NOTE 

Be aware, that if a signal bin is within the band of interest, the RSS 
selective result will represent the 

signal bin level + dist noise. 

 
The RSS selective feature is especially helpful, if a certain component of a received signal 
shall be investigated. For instance, after transmission of a single tone signal, it allows to 
evaluate the individual harmonics of the fundamental frequency. 
 

Noise 

As for distortion analysis, the noise measurement divides the frequency band in subbands, 
split by the signal bins, and calculates the noise values of these subbands. 

Содержание RT-1M

Страница 1: ...V 3 32 Feb 99 NTI_SVR1 Instdata RAPID TEST RT 1M U_Manual text RT1M332 doc 8VHU 0DQXDO 9 Multitone Audio Test System Version 3 32 E For Firmware Revision 3 25 and higher...

Страница 2: ...9 Multitone Audio Test System User Manual 2 71 V 3 32...

Страница 3: ...paid your 9 System to your nearest authorized service center Be sure to include your sales invoice as proof of purchase date All transit damages that may eventually occur are not covered by this warra...

Страница 4: ...cuments EC Rules 89 392 91 368 93 44 93 68 73 23 89 336 92 31 Harmonized Standards IEC 65 IEC 68 2 31 IEC 348 EN50081 1 EN50082 1 EN50140 EN 61010 1 This declaration becomes void in case of any change...

Страница 5: ...d Connection 13 Battery Low Indication 13 LED Indicators 14 Power 14 Interface 14 Calculating 14 Trigger 14 Overload 14 Error 14 Test of Function 15 HT BASIC Program Example 15 3 SYSTEM DESCRIPTION 16...

Страница 6: ...ion 30 MT SINAD 30 RSS Selective Measurement 31 Noise 32 Full Band Noise 32 Crosstalk 33 Phase 34 DTMF Mode 34 Broadcast Mode 35 Mode of Operation 35 Setup 35 Trigger Configuration 36 Application Hint...

Страница 7: ...TONe CONtinuous 52 OUTPut 1 2 STATus 52 OUTPut MTONe NAME 53 OUTPut MTONe BLOCklength 53 OUTPut MTONe PARameter 53 OUTPut 1 2 MTONe CRESt 54 MEASurement Subsystem 55 MEASurement 1 2 LEVel UNIT dBVp Vp...

Страница 8: ...tus Byte register 64 IEEE Standard Status Data Structure 65 5 APPLICATION HINTS 66 Arbitrary Generator 66 Alignment and Adjustments for Audio Repair Facilities 66 Cellular Phone Testing 66 Rub Buzz Sp...

Страница 9: ...nge 60dBVp to 20dBVp Measurements level noise distortion crosstalk and phase in one step Burst transmission time typ 250 960ms Residual distortion 86dB 9 is very simple in terms of connecting handling...

Страница 10: ...r Phone Testing Comparison of Conventional vs Multitone Testing Additional application notes on speaker testing external signal analysis etc will be released in future Please contact you local NEUTRIK...

Страница 11: ...non condensing AC Power Connection Before connecting the instrument via mains cable to the power source make sure that the voltage selector label on the connector fuse holder assembly of the 9 system...

Страница 12: ...talk and listen address unless totally transparent or a talk or listen only device The address of the 9 can be adjusted with the DIP switch at the rear panel of the instrument see Fig 2 Each switch po...

Страница 13: ...of BNC inputs The respective HIGH and LOW inputs of the BNC and banana connectors are internally wired together Caution For balanced signals make sure that not only the front ground connection is dis...

Страница 14: ...open it WARNING Do not try to do further repairs Call your local dealer for support Interface This LED indicator lights up if the IEEE interface is busy and receives a command It remains illuminated u...

Страница 15: ...90 PRINT 100 GOTO 65 110 STOP 900 read system information 905 DIM Inf 100 910 OUTPUT Adr System Information END 920 ENTER Adr Inf 930 PRINT Inf 940 RETURN 1000 interpret incoming data stream 1010 DIM...

Страница 16: ...ne test Many frequencies with non correlated phase relations exist in such a real world signal Therefore multitone testing is a much more realistic approach for audio testing emulating the complex str...

Страница 17: ...e to get a free copy of this software Multitone Parameter 9 is a digital processing system that analyzes the transmitted signal by using Fast Fourier Transformation FFT and calculates with its DSP all...

Страница 18: ...th a blocklength of 512 48kHz sampling rate a multitone block duration of 10 7ms results corresponding to a min frequency of f 93 75Hz see Equation 3 Furthermore it is important to know that only sign...

Страница 19: ...isplayed max 20 20 Equation 5 Maximum Signal Bin Frequency Besides the above equations there are no other constraints for the definition of a multitone signal This means you can use any bin representi...

Страница 20: ...directly comparable to conventional analyzers Please refer to the corresponding application note filed in the appendix of this manual Signal Table 9 supports five different blocklengths According to E...

Страница 21: ...ution 11 71875 Hz Bin_Min fmin 1 23 4 Hz Bin_Max fmax 853 19 992 kHz Table 4 Signal Parameter with Blocklength 2048 fs 48kHz Blocklength 4096 Frequency spacing f 11 71875 Hz Analyzer resolution 5 8593...

Страница 22: ...y block provides capacity for four independent test signals each with 16 bit resolution and any length defined in Table 1 Space is also provided for the header of each signal The master clock is deriv...

Страница 23: ...RY DSP CPU Fig 17 Block Diagram Analyzer Analog Section 9 features two independent analog input stages with completely independent ranging facilities The inputs are balanced with BNC and 4mm banana co...

Страница 24: ...e of the signal Blocklength number of samples Number of signal bins for channel 1 Number of signal bins for channel 2 Signal bin numbers of channel 1 Signal bin numbers of channel 2 Phases of the sign...

Страница 25: ...considering the header explained below is the reciprocal value of 93 75Hz which is 10 67ms ATTENTION Do never define exclusively the three signal bins 562 5Hz 1406 25Hz and 3 0kHz as multitone signal...

Страница 26: ...tion Mode Normally the analyzer of 9 uses the internal sample frequency clock of the generator This mode should be used for all applications where no frequency shifts occur on the signal transmission...

Страница 27: ...r waits one period of the multitone burst to let the transients of the DUT disappear before it starts with a two block FFT This calculation takes depending on the block length between 48ms and 190ms T...

Страница 28: ...pond to the RMS level of the received multitone signal signal bin levels distortion noise However this value is of almost no interest for the characterization of a DUT since it reflects its overall at...

Страница 29: ...d THD N value With conventional THD N analysis a single tone stimulates the DUT This frequency component is subtracted from the received signal after transmission The ratio of the remaining level to t...

Страница 30: ...distortion results expressed in V THD N Calculation To evaluate the THD N value of a DUT the following requirements have to be met Stimulation of the DUT with a single bin signal Calculation of the TH...

Страница 31: ...Measurement The MEASurement 1 2 SELectiverss binstart binstop command allows to query the TD N result of a user defined band anywhere between 20Hz and 20kHz Both the lower and the upper border of thi...

Страница 32: ...ording to the following formula Noise U RSS value of all odd bins in a band i i i a b 2 2 1 2 1 1 Equation 13 Noise Calculation NOTE Equation 13 describes the internal noise calculation of 9 i e the a...

Страница 33: ...y It is expressed in or dB Crosstalk Unused Bin ChB Set Bin ChA i LEFT i i _ _ _ _ Equation 15 Calculation of Crosstalk As an example we may assume that a signal bin with 10dB 1kHz is transmitted via...

Страница 34: ...tones comprise the indicated frequencies as shown in Table 7 1209Hz 1336Hz 1477Hz 1633Hz 697Hz 1 2 3 a 770Hz 4 5 6 b 852Hz 7 8 9 c 941Hz 0 d Table 7 DTMF Signal Coding For instance the DTMF tone for k...

Страница 35: ...d in the analyzing unit Setup The complete procedure to set up a broadcast transmission test with 9 may be summarized as follows 1 Install the generator and analyzer at the intended locations and cont...

Страница 36: ...ccording to user specific demands However since this application requires a very thorough and detailed understanding of the whole triggering complex this approach is for very advanced users only who h...

Страница 37: ...e instructions listed in chapter Setup p 35 and following hints it shouldn t become a major problem to establish a properly working set up The most effective approach to successfully execute a first t...

Страница 38: ...input range too low The input stage of the analyzer is too sensitive i e overloaded and therefore can t recognize the in coming trigger Increase input range of ana lyzer stepwise Very strong sound enh...

Страница 39: ...ty Remote local RL0 Only local lockout Parallel poll PP0 No capability Device clear DC1 Complete capability Device trigger DT0 No capability Controller C0 No capability Table 9 IEEE 488 1 Compatibilit...

Страница 40: ...Rameter IDN OUTPut MTONe NAME RST OUTPut MTONe BLOCklength TST OUTPut MTONe CRESt WAI OUTPut STATus Descriptive Symbols Following terms are used in the command description Symbol Description Used to e...

Страница 41: ...Lists the possible answers on a query and their types integer float boolean string Parameter Description of the Parameter to be set and their types integer float boolean string Range List of the avail...

Страница 42: ...command found e g RANGE 130 No OUTPut command found e g FLOAT 131 No OUTPut 1 2 command found e g LEVEL 132 No MTONe command found e g START 133 No TRIGger command found e g ARMed 140 No MEASurement c...

Страница 43: ...10 Analyzer overload 220 Battery low memory backup 230 Hardware and software revisions do not match 240 Minimum one external measurement required beforehand 246 Measurement not possible Signal bins de...

Страница 44: ...e physically disconnected at front and rear Range OFF ON boolean Default OFF Query Use command INPut 1 2 STATus Example Input2 Link ON INP1 LINK OFF Explanation This command allows e g to check the pr...

Страница 45: ...multitone burst Frequency shifts are compensated This mode is recommended if notable frequency shifts are expected Max allowable time delay is 1s No synchronization is transmitted or performed at all...

Страница 46: ...ote RT 1M unit i e to run the analyzer in the so called Broadcast Mode In the armed status the Trigger LED will be flashing until a trigger is detected LED is lit Keep in mind that for broadcast appli...

Страница 47: ...ed for broadcast applications where the signal is inserted into a shortly interrupted broadcast signal This configuration allows the user to define the trigger condition individually However since thi...

Страница 48: ...Explanation See chapter Broadcast Mode INPut 1 2 STATus Use Queries the complete input channel status Answer Range_Unit SW_Filter Front_Conn Link SYNC_Mode Deemphasis Trig_Config float string boolean...

Страница 49: ...in1 to Bin_Max2 to to 1 48 000 20 Bin Min Hz Hz _ NoOfSamples 2 48 000 20 _ Bin Max Hz kHz NoOfSamples Query Use command OUTPut MTONe PARameter Example Output Mtone Par 1 Telefon 2048 3 3 25 85 256 25...

Страница 50: ...next possible value The duration of the pretrigger excludes the duration of the trigger which always occupies some 42ms The value 0 defines the shortest possible pretrigger length of 0ms The command...

Страница 51: ...UTPut 1 2 STATus Example Outp1 Binlevel 6 2 dBVp Explanation Be aware that when bin level is set the total output level is higher as per Equation 6 The maximum output level of 10Vp cannot be exceeded...

Страница 52: ...d analyzed only OUTPut MTONe CONtinuous Use Starts the generator to endlessly send out the active multitone signal Example OUTP MTONE CON Explanation The signal is sent out in an endless loop Only the...

Страница 53: ...UTput MTONe BLOCklength 2048 OUTPut MTONe PARameter Use Queries the parameter of the active multitone signal Format is compatible with the command OUTPut MTONe PARameter Answer Sig_Number Sig_Name No_...

Страница 54: ...OUTPut 1 2 MTONe CRESt Use Queries the Crest factor of the active multitone signal Answer Crestfac float Range any positive number 2 Example OUTP1 MTONe CREST 2 33433E0 Explanation Refer to chapter P...

Страница 55: ...Default NaN not a number Example MEAS1 LEV 3 1 240E0 dBV 23 9 727E 1 dBV 84 8 254E 1 dBV Explanation The returned level vector is grouped in result pairs starting with the first signal bin number a th...

Страница 56: ...n Bin_Min 20Hz and Bin_Max 20kHz The single value calculation considers Signal plus Distortion plus Noise to Distortion plus Noise for any defined multitone signal see also chapter MT SINAD p 30 Answe...

Страница 57: ...selective result will include this signal bin level in addition to the distortion noise value of the band MEASurement 1 2 NOISe UNIT dBV V Use Defines the unit in which the noise measurement results s...

Страница 58: ...Sstalk Use Returns the measured crosstalk of the last received multitone signal for one channel The crosstalk result can be evaluated only if at least one signal bin of each channel is set at an exclu...

Страница 59: ...ample MEAS1 PHASE 3 1 24E0 deg 23 9 27E 1 deg Explanation The returned result is composed of pairs each starting with the signal bin number followed by a the phase result a white space the unit in whi...

Страница 60: ...ot used Not used Not used Example STB 32 OPC Use The OPeration Complete command causes RT 1M to generate the operation complete message in the standard event status register Bit 0 when all pending sel...

Страница 61: ...e ESE 32 enables command error event ESE Use The standard Event Status Enable query allows the programmer to determine the current contents of the standard event status enable register See also chapte...

Страница 62: ...system errors query Not used Device specific error event flag e g no trigger detected The occurred error number can be read with the system errors query Not used Not used Operation complete event flag...

Страница 63: ...4 float Example IDN NEUTRIK RT1M 0122 3 01 RST Use The ReSeT command performs a device reset All Parameter are set to default values except the output and command queue See also chapter IEEE Standard...

Страница 64: ...y polling the controller Use of MAV bit in the status Byte register sre 16 enable Output queue Not empty event output mtone start start measurement meas1 dist get distortion values as soon as the outp...

Страница 65: ...STB read by Serial Poll Standard Event Status Enable Register ESE NRf ESE Service Request Enable Register SRE NRf SRE Power ON Not Used Command Error Not Used Device Dependent Error Not Used Not Used...

Страница 66: ...and transmitted through an antenna to quickly obtain the frequency response and distortion in the voice band of the whole signal path Frequency shifts as they may appear on AM FM transmissions are eli...

Страница 67: ...tc Fig 25 RT EVAL Screenshot Fig 25 shows a typical screen shot of the RT EVAL software with generator analyzer multitone system configuration measurement panel Please contact you local representative...

Страница 68: ...ers to the actual input impedance as e g 600 dBm V W R RMS In 20 0 001 10 log 2 22 20 1 10 log dBm V 0 001 W 600 RMS dBm0 dBm referred to or measured at a point of zero transmission level dBrn dB abov...

Страница 69: ...accuracy 0 2dB 1kHz Flatness 0 2dB 20Hz to 20kHz Analyzer Measurement functions Level Total Distortion Noise Interchannel Phase Crosstalk measured simultaneously Number of channels 2 Resolution 18bit...

Страница 70: ...ed Units 68 Descriptive Symbols 40 Distortion Full Band 30 Measurement 28 Plot 29 Driver Library 10 DTMF Mode 34 Duration of Multitone Burst 20 of Multitone Signal 18 E Error LED Indicator 14 Evaluati...

Страница 71: ...xample 15 Programming 39 R Rack Mount 11 RMS Value 29 RSS Selective Measurement 31 Value 29 RT EVAL 67 Rub Buzz Testing 66 S Sampling Rate 17 Signal Bins 19 Definition 24 SINAD 30 Software Tools 10 Sp...

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