Promax 6 Скачать руководство пользователя страница 26 | Manualshive

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E xample 11.

Measurement of the C/N ratio for channel D24 (no adjacent channel).

Channel power level =

74 dBµ V (14 dBmV)

Real C/N ratio

=

32 dB

Measured C/N ratio = 32 dB ± error (see appendix F)

(D23, channel adjacent to D24)

D.23

(No adjacent channel)

D.24

Display appears after about 5 seconds.

C/N mode can be exited by simply pressing any key or turning the rotary

encoder.

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Содержание 6

Страница 1: ...cal and easy to use device It can carry perform the following types of measurements Analogue channels Carrier level meter Carrier to Noise C N ratio meter Video to Audio V A ratio meter Digital channels Channel power meter Carrier to Noise C N ratio meter All the measurements for both analogue and digital channels are direct i e PROMAX 6 automatically carries out all the necessary corrections in a...

Страница 2: ...ccuracy and reliability satisfy the requirements of the most demanding users The signal level measured is shown numerically on an LCD display in absolute values It is also equipped with a computer connection which allows one to personalize the configuration of the instrument The instrument is powered by an external rechargeable battery and it is safe to use outdoors The implementation of all these...

Страница 3: ...ce 75 Ω Audible indicator Tone which varies with the signal level Accuracy Analogue channels 2 dB from 0 to 40 ºC 4 for negative video modulation 4 Digital channels 3 dB from 0 to 40 ºC for 8 MHz bandwidth channels Video Audio Analogue channels Measurement Ratio of video to audio carrier levels Range From 0 to 40 dB Audio subcarrier frequency Standard 5 5 MHz 1 2 Variable 4 9 MHz Accuracy 2 dB fro...

Страница 4: ...relative humidity 80 up to 31ºC decreasing lineally up to 50 at 40ºC Degree of protection provided by the enclosure IP 23 tested for safety according to IEC529 and IEC1010 1 Mechanical features Dimensions 70 W 90 on the display x 218 H x 50 D mm Weight 580 g including battery 1 Under request carried out at the factory See option OPT 006 61 2 May be configured by PC by means of the RM 006 program S...

Страница 5: ...ble CB 410 Battery charger module CB 038 7 2 V 0 8 Ah NiCd rechargeable battery Options OPT 006 1 Substitute mains adapter for AL 022 OPT 006 2 Substitute mains adapter for AL 032 OPT 006 3 Substitute mains adapter for AL 042 OPT 006 4 Substitute mains adapter for AL 052 OPT 006 61 Change channel tables units of measurement etc Carried out under request in the factory Optional accessories AD 055 F...

Страница 6: ...echargeable battery Cigarette lighter adaptor Battery charger Observe all specified ratings both of supply and measurement Use this instrument under the specified environmental conditions The user is only authorized to carry out the following maintenance operations Battery replacement On the Maintenance paragraph the proper instructions are given Any other change on the equipment should be carried...

Страница 7: ... mains Insert the battery in the charger once the adapter charger is connected to the mains 2 Discharge the battery prior to carrying out the charging process in order to eliminate any possible residual charge In order to do so press button A situated on the right see figure 1 At this point a small yellow light comes on and the process of discharging is under way When discharging is completed the ...

Страница 8: ...he lifetime of the batteries it is advisable not to remove it from the charger while the charging process is still under way 4 The mains adapter and the battery charger are designed for indoor use 5 When using the battery first time it is advisable to carry out two charging and discharging processes into the charger itself in order to eliminate any possible memory effect accumulated during the per...

Страница 9: ... remains fixed as shown in the figure 2 Figure 2 Installation of the CB 038 battery Removing the battery The battery is accessible from the back of the instrument To disconnect the battery press the tab found at one end of it 1 and move the battery to separate it from the body of the instrument 2 The battery will be released from its holder Then slide the battery out as shown in figure 3 Figure 3 ...

Страница 10: ...activated by holding down the ON OFF key for one or two seconds when the device is connected The indicator manual power off will appear on the display If the battery is low at a voltage of less than 6 5 V a blinking LOW BATTERY message will appear on the display 3 When the voltage is lower than 6 0 V the instrument disconnects A fully charged battery can power the equipment non stop for more than ...

Страница 11: ...4 OPERATING INSTRUCTIONS 4 1 Description of the controls and elements Front Panel Figure 4 Front view ...

Страница 12: ...io and carrier noise ratios 4 Rotary switch Used for continuous tuning control or for selecting the various options associated with each key 5 Keyboard Seven keys for selecting the functions 6 Connection to computer for option RM 006 0CA2170 specific connection cable supplied with option RM 006 Do not connect any cable other than that supplied by the manufacturer with option RM 006 otherwise the i...

Страница 13: ...ted digital channels When this measurement mode is selected an d appears on the display to the right of the units 12 ON OFF Connects disconnects the instrument and allows the user to select automatic or manual cut off 13 Special functions F1 Sound AM FM LEVEL OFF F2 Sound subcarrier tuning from 4 9 MHz F3 Frequency shift with respect to the main frequency for measuring the C N ratio on digital cha...

Страница 14: ...io of the signal once the video carrier level is stabilized 15 Measurement of the video to audio ratio only on analogue channels Press this key to measure the video to audio ratio of the signal once the video carrier level is stabilized 16 Tuning mode frequency or channel Press this key to select among tuning by frequency or channel ...

Страница 15: ... be established under request OPT 006 61 or be configured by the user RM 006 with a maximum of 239 channels To pass from one mode to the other push the CHAN key 16 Example 1 Changing from channel mode to frequency mode This procedure can be useful in discovering the real frequency in MHz of the selected channel The example illustrates finding the frequency which corresponds to channel 44 Test Equi...

Страница 16: ...he channel mode to make substantial changes in frequency as is shown in the example below C69 The selection of the channel situated in a frequency close to the desired frequency 850 25 Note When changing from frequency to channel if the frequency tuned does not correspond to any channel the PROMAX 6 will search for the channel nearest to this frequency and will remain tuned to this channel This op...

Страница 17: ... the right of the units Likewise when the digital channel measurement mode is selected a d appears on the display to the right of the units The measurements possible for each type of channel are as follows Analogue channels Carrier level meter Carrier to Noise C N ratio meter Video Audio V A ratio meter Digital channels Channel power meter Carrier to Noise C N ratio meter Note Channel denomination...

Страница 18: ...ent is from 25 to 120 dBµV and within this range the measurement is completely automatic The microprocessor calculates the attenuation value corresponding to the proper measurement range When the signal level being measured is lower equal than the sensitivity or higher equal than the saturation level of the instrument the symbols or will appear respectively When the tuning is carried out by channe...

Страница 19: ...e sound subcarrier in channel 44 655 25 MHz 5 5 MHz 660 75 MHz The noise level of the instrument is situated between 5 and 7 dBµV This means that the instrument can measure signals between 10 and 20 dBµV The sign appears to indicate that in this area it is possible that specified accuracy may not be complied with but in most cases a measurement valid for all purposes is given ...

Страница 20: ...ment 1 Select the analogue channels measuring mode 2 Tune the desired video carrier and wait a few seconds until the read level is stabilized 3 Press the V A 15 key 4 Wait until the measurement is stabilized 3 seconds maximum Example 6 Measuring the V A ratio for the following signal Video frequency C55 743 25 MHz Video carrier level 74 dBµV 14 dBmV Audio subcarrier frequency 5 5 MHz Audio carrier...

Страница 21: ...nt automatically takes a series of measurements in order to arrive at the closest approximation to the noise level The time of approximation is a function of the content of the picture that is being transmitted and of the C N value itself When the noise level is lower than the sensitivity of the instrument a limit value will appear on the display indicating that the C N value the user is trying to...

Страница 22: ...e 9 Measuring the C N ratio of low level signals 70 dBµV The C N ratio measurement dynamic is proportional to the video carrier level So when the video carrier level is lower than 70 dBµV the C N measurement dynamic does not surpass 50 dB see Appendix E If the C N ratio to be measured is higher than this value the instrument will indicate it by means of the symbol Video carrier level 65 dBµV Real ...

Страница 23: ...asured value to stabilise Read the vale displayed Units will be expressed in dBµV dBmV using option OPT 006 61 or by means of the personalisation program RM 006 The direct reading range covers from 34 up to 129 dBµV and all measurements within this range are entirely automatic The microprocessor calculate the attenuation value for the suitable measurement range When the signal level to be measured...

Страница 24: ...ction F3 has been incorporated An easy way to check if there is an adjacent channel at the lower frequencies consists of making a level measurement at a frequency 8 MHz lower to the main frequency of the channel being studied and comparing if level is similar to the power level of the channel under study there is an adjacent channel or the level drops off significantly there is no adjacent channel...

Страница 25: ...level stabilises 3 Select the frequency shift of the noise level measurement by means of the F3 function to 4 5 MHz with respect to the main carrier 4 5 MHz is the value predetermined at factory for this parameter so if it has not been modified through the F3 function it will not be necessary to redefine it now 4 Press the C N 14 key 5 Wait until the reading stabilises 10 seconds maximum When the ...

Страница 26: ...Channel power level 74 dBµV 14 dBmV Real C N ratio 32 dB Measured C N ratio 32 dB error see appendix F D23 channel adjacent to D24 D 23 No adjacent channel D 24 Display appears after about 5 seconds C N mode can be exited by simply pressing any key or turning the rotary encoder ...

Страница 27: ...and wait a few moments until the reading level stabilises 3 Select the frequency shift of the noise level measurement by means of the F3 function to a frequency where the modulation content is minimum about 4 MHz 4 Press the C N 14 key 5 Wait until the reading stabilises 10 seconds maximum Example 12 Measurement of the C N ratio for channel D25 with adjacent channel Channel power level 74 dBµV 14 ...

Страница 28: ... D24 channel adjacent to D25 D 24 Adjacent channel present D 25 Frequency shift selection F3 4 00 Display appears after about 5 seconds ...

Страница 29: ...with the disconnection of the sound itself FM FM sound AM AM sound LV The speaker emits a tone whose frequency varies as a function of the signal level received OFF Sound not selected The demodulation of both AM and FM is effected on the carrier tuned To select the type of sound press the FCT key 13 select the F1 function and turn the rotary switch until the desired type of sound is displayed Pres...

Страница 30: ...ion is necessary if the user wants to vary the frequency of the sound subcarrier related to the measurement of the V A ratio see Point 4 2 3 2 The instrument takes as the default frequency the value configured in the factory or a customized configuration through RM 006 However with the F2 function the user can vary the sound subcarrier value manually from 4 to 9 MHz Test Equipment Depot 800 517 84...

Страница 31: ...Example 14 Changing the sound subcarrier frequency from the standard value to 5 74 Zweiton Stereo F2 5 75 ...

Страница 32: ...onfigured values or those programmed by means of RM 006 4 3 Connection to the computer The system may be connected to a PC by means of the connection cable which is supplied with option RM 006 Do not connect any cable other than that supplied by the manufacturer with option RM 006 otherwise serious damage may be caused to the equipment 1 Prior to connecting the equipment to a PC disconnect both fr...

Страница 33: ...ce The method of maintenance to be carried out by the user consists of cleaning the cover and changing the battery All other operations should be carried out by authorized agents or by personnel qualified in the servicing of instruments 5 2 1 Cleaning the cover CAUTION To clean the cover remove the battery from its housing CAUTION Do not use scented hydrocarbons or chlorized solvents Such products...

Страница 34: ...mission line From 70 to 100 dBµV From 10 to 40 dBmV In the user s terminal From 60 to 80 dBµV From 0 to 20 dBmV b Positive Video Modulation SECAM On this type of modulation the line synchronism is defined by a minimum carrier level The maximum signal level measurement point is variable in time and it is a function of the picture that is being transmitted It could vary from 10 dB among white and bl...

Страница 35: ...two consecutive channels CVL1 CVL2 dB Figure 9 Measurement of the adjacent channel level Differences of more than three dB between carriers of adjacent channels may cause problems of interference in reception Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com ...

Страница 36: ... the video to audio carriers 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 dB below the video carrier Figure 10 Measurement of the relative video audio ratio These specifications ensure that there is no interference in the same or the adjacent channel ...

Страница 37: ...of 5 MHz If the measurement is reduced to a different bandwidth the user must apply a simple correction The PROMAX 6 takes the measurements in a noise bandwidth of 5 MHz C N CL NL dB NL depends on the measurement bandwidth NL Nmeasured L 10 log BWx BW measured There is some standards that determine the minimum C N value in an installation In general greater values than 40 dB are considered good qu...

Страница 38: ...he video carrier level in a channel for instance the 45 is of 25 dBmV from the diagram we can deduce that the measurement range is of 45 dB Thus if when we carry out the measurement the C N ratio is 54 dB the display will show on the other hand if C N 42 dB we will see on the display ...

Страница 39: ...error free transmission ETR290 Measurements Group ETR 290 as that with less than 1 error event per transmission hour For a 64 QAM DBV C transmission the pre FEC error Forward Error Correction must be 1 E 4 In digital transmissions as there is not one carrier it is better to speak in Eb No terms The relation between Eb No and the C N is given by the following equation Where E b Energy per bit N o N...

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