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Promax PROMAX-10 Premium, User Manual

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Promax PROMAX-10 Premium User Manual Download Page 45

USER’S MANUAL. PROMAX-10

Premium

Page 48 05/2004

APPENDIX B.-

MEASUREMENT OF THE ADJACENT CHANNEL LEVEL
-ANALOGUE CHANNELS-

The user can obtain the ratio between the video carrier amplitudes of two

adjacent channels.

)

dB

(

C

C

2

LV

1

LV

−

Figure 45.- Measurement of the adjacent channel level.

Differences of more than 3 dB between carriers of adjacent channels may

cause problems of interference in reception.

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Summary of Contents for PROMAX-10 Premium

Page 1: ...2 3 1 2 Audio carrier measurement and demodulation 25 4 2 3 1 3 CSO CTB distortion products measurement 25 4 2 3 1 4 Power and C N ratio measurement of digital channels DVB C DVB T DAB 27 4 2 3 1 5 C...

Page 2: ...ier Noise ratio measurement C N Video Audio ratio measurement V A CSO and CTB Intermodulation distortion measurement Digital channels DVB C DVB T and DAB Channel power measurement by integration Carri...

Page 3: ...ing to a printer or computer for producing reports on the measurements obtained The instrument is powered by means of an internal rechargeable battery All these functions have been brought together in...

Page 4: ...R Modulation error ratio Measurement range 22 dB to 34 dB for 64 QAM Accuracy 2 dB BER Bit error rate Measured before RS decoding Measurement range 10 E 2 to 10 E 8 Constellation Diagram DVB QAM signa...

Page 5: ...sured at four frequencies user definable Measuring frequencies User definable from 2 50 to 0 50 MHz and from 0 50 to 2 50 MHz Default values 1 50 0 50 0 50 and 1 50 MHz CTB Ratio of the peak level of...

Page 6: ...dB Detection range From 5 to 100 MHz maximum Readout Number of detected transitory in the measuring time Present detected level and maximum detected level in the time of the measurement AUDIO Demodul...

Page 7: ...present For higher input power levels the use of an external attenuator of 20 dB is recommended There may be certain frequencies where the symbol appears at levels higher than 25 dB V maximum 28 dB Th...

Page 8: ...tute mains adapter by AL 052 OP 010 61 Change channel plan Carried out under request in the factory OP 010 E Extension of SYMBOL RATE measurement range OPTIONAL ACCESSORIES AD 055 F female BNC female...

Page 9: ...nts It is for INDOOR USE When using some of the following accessories use only the specified ones to ensure safety Power adapter Car cigarette lighter adapter Observe all specified ratings both of sup...

Page 10: ...ed with safety DIRECT CURRENT ALTERNATING CURRENT DIRECT AND ALTERNATING GROUND TERMINAL PROTECTIVE CONDUCTOR FRAME TERMINAL EQUIPOTENTIALITY ON Supply OFF Supply DOUBLE INSULATION Class II protection...

Page 11: ...ium English 2 2 Descriptive Examples of Over Voltage Categories Cat I Low voltage installations isolated from the mains Cat II Portable domestic installations Cat III Fixed domestic installations Cat...

Page 12: ...illuminated during this period On having finished the battery charge the indicator will be illuminated blinking to indicate that a maintenance charge takes place 2 With the instrument working when co...

Page 13: ...nding on the time and temperature of inactivity the battery will have been reconditioned 3 2 Installation and start up The PROMAX 10 Premium has been designed for use as portable equipment A fully cha...

Page 14: ...controls and elements Front panel Figure 2 Front panel 1 F F or F BNC or F IEC adapter Maximum input voltage level 60 VAC rms 50 60 Hz 2 F male base connector 3 Graphic display with back lighting 4 DC...

Page 15: ...other than that supplied by the manufacturer otherwise the instrument may suffer serious damage 9 Rotary selector Push button Figure 3 PROMAX 10 Premium keyboard 10 Selects the CHANNEL FREQUENCY opera...

Page 16: ...mode enables multiple measurements to be performed and memorised for subsequent checking transfer to PC or printing It can perform and store up to 55 obtained measurements or loggers in the memory Ea...

Page 17: ...simply press the corresponding key The parameters relative to a particular operating mode can be modified through the configuration menu associated to the mode In order to accede to the configuration...

Page 18: ...ing the rotary selector the unit accedes to the active CHANNEL PLAN The attached figure shows an example of channel plan The first line shows the name of the channel plan CCIR in the figure the audio...

Page 19: ...s digital it is possible to accede directly to the digital channel configuration In order to return to the Edit Channel Plan function press the CONFIG 14 key To modify the rest of characteristics of t...

Page 20: ...nu Turn the rotary selector until appears shaded line VLNB Press the rotary selector to activate the selection Turning the rotary selector this one goes successively of OFF to ON Finally to press the...

Page 21: ...press the rotary selector 9 the span field is activated and then turn it The span is variable from the entire band full span to 10 MHz in the following steps 10 30 100 300 MHz y full span By pressing...

Page 22: ...or this mode This menu permits to change three parameters THRESHOLD REFERENCE LINE and POWER MEASUREMENT To accede to any of them turn the rotary selector 9 until it appears shaded and next press the...

Page 23: ...channel tuning to frequency tuning 4 2 3 1 Channel tuning 4 2 3 1 1 Video carrier V A C N measurement If the tuned channel has been defined as analogue by means of the Edit Channel Plan function see s...

Page 24: ...ird order beats The CSO distortion Composite Second Order is defined as a ratio of the peak level of the video carrier to the peak of the distortion products of second order beat produced by the rest...

Page 25: ...o make this measurement at one of the free adjacent channels see section 4 2 3 3 Channel Frequency mode configuration MEASURING METHOD When pressing the rotary selector 9 again we will accede to the C...

Page 26: ...orrectly previously the channel must be defined as digital see Edit Channel Plan function at section 4 2 1 Unit Global Configuration and if necessary the CHANNEL BW parameter should be redefined by me...

Page 27: ...Frequency configuration menu paragraph 4 2 3 3 allows the user to redefine this parameter when tuning a new channel the equipment will return to assign to NOISE FREQ the default value The following fi...

Page 28: ...fication MPEG2 When pressing again the rotary selector the PROMAX 10 Premium carries out a new measurement If the selector rotary is pressed two times it is acceded again to the screen of Power and C...

Page 29: ...4 2 3 2 Frequency tuning and configuration When in CHANNEL FREQUENCY operating mode pressing again the CH FR 10 key switches tuning by channel to tuning by frequency and vice versa In the tuning by f...

Page 30: ...s when operating in frequency tuning are identical to the described ones for the channel tuning operation See section 4 2 3 1 Channel tuning b Configuration When the PROMAX 10 Premium works in the FRE...

Page 31: ...measured in the C N measurement NOISE FREQ 99 9 MHz relative mode 5 00 MHz to 862 00 MHz absolute mode Only digital channels Noise measuring mode NOISE MODE FREQ Absolute Noise level is measured at th...

Page 32: ...press The value of the parameter will be activated and may be changed by turning the rotary selector When the value you want appears press the rotary selector 9 to validate it DESCRIPTION PARAMETER VA...

Page 33: ...or the channel tuning PROMAX 10 Premium admits values from 2 00 to 2 00 MHz IMPORTANT To leave the configuration menu of the CHANNEL FREQUENCY mode just press the key of the operating mode you wish to...

Page 34: ...he rotary selector 9 a second time will activate the tuning frequency field of the marker being possible to tune new frequencies Figure 30 Reference level modification The attached figure shows an hor...

Page 35: ...mode configuration menu In this operating mode it is advised to select the Average detector see section 4 2 4 5 Spectrum mode configuration menu Figure 33 MIN mode First scan Figure 34 After several...

Page 36: ...g the rotary selector When the value you want appears press the rotary selector 9 to validate it The parameters that can be modified through this menu are a BAND It selects the analyzed band between R...

Page 37: ...TS will appear Turning the rotary selector 9 the reference level may be modified The pilots may be defined in two ways a By frequency Using the TILT configuration menu See section 4 2 5 1 Tilt mode co...

Page 38: ...of the TILT mode just press the key of the operating mode you wish to access 4 2 6 DATALOGGER operating mode The LOGGER function permits to automatically measure the level the Carrier Noise ratio and...

Page 39: ...dio carrier for the analogue channels and the frequency offset for the noise measure of the digital channels C N ratio will correspond with the configuration of the equipment at the time of carrying o...

Page 40: ...HRESHOLD and MEASURES parameters To accede to them turn the rotary selector and once the parameter we want to change is appears shadowed press it then turning it its value will be modified Finally pre...

Page 41: ...odel CC 208 Do not connect any cable other than that supplied by the manufacturer otherwise serious damage may be caused to the equipment 1 Prior to connecting the equipment to a PC disconnect both fr...

Page 42: ...from a computer the following options 1 CHANNELS PLAN PROCESSOR Modify add or delete channel plans 2 CONFIGURATION Permits to modify all the configuration parameters 3 DATALOGGER Permits to edit and...

Page 43: ...sed agents or by personnel qualified in the servicing of instruments 5 2 1 Cleaning the cover CAUTION Do not use scented hydrocarbons or chlorized solvents Such products may attack the plastics used i...

Page 44: ...es are In the transmission line From 70 to 100 dB V From 10 to 40 dBmV In the user s terminal From 60 to 80 dB V From 0 to 20 dBmV B Positive Video Modulation SECAM On this type of modulation the line...

Page 45: ...EL ANALOGUE CHANNELS The user can obtain the ratio between the video carrier amplitudes of two adjacent channels dB C C 2 LV 1 LV Figure 45 Measurement of the adjacent channel level Differences of mor...

Page 46: ...the video carrier and the audio carrier amplitudes Although this process depends on the standard used it is usual to consider that a properly transmitted PAL channel should have a sound subcarrier 13...

Page 47: ...BW N C N C where C Video carrier level NBWX Noise power referred to a BWx measurement bandwidth and as the noise power referred to BWx could be related with the noise power referred to 5 MHz according...

Page 48: ...ge Example Suppose that the video carrier level for an analogue channel is of 10 dBmV from the diagram we can deduce that the measurement range is of 48 dB Thus if when we carry out the measurement th...

Page 49: ...Error Rate The DBV Group Digital Video Broadcasting defines a quasi error free transmission ETR290 Measurements Group ETR 290 as that with less than 1 error event per transmission hour For a 64 QAM DB...

Page 50: ...asurement used in analogue systems MER represents the ratio of the error power to the average power in an ideal QAM signal Ideally you should have at least 4 or 5 dB of margin from the MER where signi...

Page 51: ...on a margin of at least 3 or 4 dB is preferred However QAM 256 set decoders require better than 28 dB MER to operate with margins of 3 dB at least Typically the maximum MER displayed on portable analy...

Page 52: ...formation also The number of levels used in the modulation of each carrier determines the number of possible symbols and consequently the number of bits that can be transmitted in a certain bandwidth...

Page 53: ...shows the other signal Q in quadrature on a vertical axis to consider the 90 phase change Figure 51 I Q states combination Figure 51 shows the combination of these two signals This image constitutes...

Page 54: ...hannel plan Figure 52 Frequency offset on the tuning central frequency Taking as example the previous figure if we suppose that in the configuration parameters of the digital channel CH 33 a frequency...

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