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Promax 6 Manual
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Promax 6 Manual

Cable tv analyzer
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99 Washington Street
Melrose, MA 02176
Fax 781-665-0780
TestEquipmentDepot.com
1 G E N E R AL IN F O R M ATIO N
1.1 D escription
The P R O M AX -6 is an advanced model signal level meter designed for the
installation and maintenance of reception and distributions systems for analogue
and digital television signals. Its frequency range makes it into an excellent
instrument for FM radio , collective TV (MATV) and cable TV applications (CATV),
including the sub-band (return channel).
The P R O M AX -6 can carry out all the measurements necessary for ensuring
good operation of any installation within the 5 to 862 M H z range as it incorporates
the basic functions for signal analysis in an accurate, sturdy, economical and easy
to use device. It can carry perform the following types of measurements:
Analogue channels :
D igital channels :
All the measurements for both analogue and digital channels are direct, i.e.
P R O M AX -6 automatically carries out all the necessary corrections in accordance
with the type of signal to be measured.
The P R O M AX -6 is the result of intensive work in research and the experience
of more than thirty years in the development of instrumentation for television. It
enables the measurement of the signal level with a high degree of accuracy; it
incorporates a series of functions for evaluating the picture quality.
CABLE TV ANALYZER
PROMAX-6
-
Carrier level meter
-
Carrier to Noise (C/N) ratio meter
-
Video to Audio (V/A) ratio meter
-
Channel power meter
-
Carrier to Noise (C/N) ratio meter

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  • Page 1 P R O M AX -6 automatically carries out all the necessary corrections in accordance with the type of signal to be measured. The P R O M AX -6 is the result of intensive work in research and the experience of more than thirty years in the development of instrumentation for television. It enables the measurement of the signal level with a high degree of accuracy;...
  • Page 2 The implementation of all these functions in an instrument weighing only half a kilo, makes the P R O M AX -6 an incomparable work tool. Every detail has been carefully studied to achieve the best possible balance between its features and its operability.
  • Page 3 1.2 S pecifications Tuning Tuning range From 5 to 862 MHz Tuning mode By channels or frequency (1) (2) Channel plan CCIR Frequency 62.5 kHz resolution Indication LCD alphanumeric display with back lighting Level measurement Measurement Analogue channels Level measurement associated with video carrier Digital channels Power measurement on the equivalent bandwidth for QAM signals (7 or 8 MHz).
  • Page 4 (4) For the positive video modulation (Stand. L) it can vary from 0 to -2 dB among white and black image. (5) For the AM audio carrier (Stand L), it can vary from 0 to -3 dB below the V/A value. (6) See appendix E...
  • Page 5 Accessories included AL-012 EUROPE and other countries 230 V / 50-60 Hz mains adaptor (basic version only). AL-022 USA and CANADA 120 V / 50-60 Hz mains adaptor (only with the OPT-006-1). AL-032 UK 230 V / 50-60 Hz mains adaptor (only with the OPT-006-2) Australia 240 V / 50-60Hz mains adaptor (only with the OPT-006-3) AL-042 Japan 100 V / 50-60 Hz mains adaptor (only with the OPT-006-4)
  • Page 6 2 S AFE TY RULE S Use this equipment connected only to devices or systems with their common at ground potential . Use this equipment in C ategory I installations and P ollution D egree 2 environments When using some of the following accessories use only the specified ones to ensure safety.

  • Page 7: Installation

    3 IN S TALLATIO N 3.1 P ower supply The P R O M AX -6 is an portable instrument powered by a built-in 7.2 V NiCd rechargeable battery. Before taking any measurement, the user should make sure that the battery is fully charged (use the charge/discharge charger supplied with the instrument).
  • Page 8 CAUTION 1) Before using the charger, make sure that the adapter is suitable for the mains voltage. An indicator will light up when the adapter is connected to the mains and the charger is connected. 2) This charger is designed for charging Ni-Cd batteries. 3) In order to prolong the lifetime of the batteries, it is advisable not to remove it from the charger while the charging process is still under way.
  • Page 9 3.2 Installing the battery Attaching the battery Use C B-038 batteries only. To attach the battery, position it on the base of the arrows found on the back of the instrument. Slide the battery until you hear a click and it remains fixed, as shown in the figure 2.
  • Page 10 If the battery is low (at a voltage of less than 6.5 V), a blinking LO W BATTE RY message will appear on the display [3]. When the voltage is lower than 6.0 V, the instrument disconnects.

  • Page 11: P E R Atin G In S Tr U C T Io N S

    4 O P E R ATIN G IN S TR U C T IO N S 4.1 D escription of the controls and elements Front P anel Figure 4.- Front view.
  • Page 12 F-F (or F-BNC or F-IEC) adaptor Maximum input voltage level 60 VAC rms /50-60 Hz "F" male base connector Alphanumeric display with back lighting. Indicates the level, the measurement mode (analogue or digital channels), tuning (frequency / channel), the sound system and the measurements of the video/audio and carrier/noise ratios.
  • Page 13 Figure 5.- P R O M AX -6 keyboard [10] Measurement selector for analogue channels. When this measurement mode is selected, an " a " appears on the display to the right of the units. [11] Measurement selector for QAM modulated digital channels. When this measurement mode is selected, an "...
  • Page 14 [14] Measurement of the carrier/noise ratio on analogical ("a") and digital ("d") channels. Press this key to measure the carrier-to-noise ratio 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.
  • Page 15 4.2 O perating instructions 4.2.1 Tuning mode selection The P R O M AX -6 has two different tuning modes: By frequencies : From 5 to 862 MHz in steps of 62.5 kHz, using the rotary switch. The values displayed are given in MHz, with a two-decimal resolution.
  • Page 16 N ote: When changing from frequency to channel, if the frequency tuned does not correspond to any channel, the P R O M AX -6 will search for the channel nearest to this frequency and will remain tuned to this channel. This operation may take...
  • Page 17 4.2.2 M easurement mode: Analogue or digital channels The AN ALO G [10] and DIG ITAL [11] keys can be used to define the type of channel to be measured: analogical or digital, respectively. When the analogical channel measurement mode is selected, an ' a ' appears on the display to the right of the units.
  • Page 18 4.2.3 M easurements on analogue channels 4.2.3.1 C arrier level measurement (analogue channels) Select the analogue channels measuring mode as it is explained in point 4.2.2. Select the desired tuning mode and tune the signal to be measured in the manner explained in point 4.2.1.
  • Page 19 E xample 4. Measuring the commercial FM carrier (105.00 MHz) Channel S01 is nearest to the desired frequency 105.00 E xample 5. Measuring a signal outside the measurement range. The 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 dBµ...
  • Page 20 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) E xample 6 . Measuring the V/A ratio for the following signal Video frequency C55 (743.25 MHz) Video carrier level 74 dBµV (14 dBmV)
  • Page 21 4.2.3.3 M easurement of the C /N ratio (analogue channels) This function allows the user to measure the ratio of the video carrier level to the noise level present in the channel. Follow the steps listed below to take this measurement. 1) Select the analogue channels measuring mode.
  • Page 22 E xample 8. Measuring the C/N ratio of high-quality signals Video carrier level 113 dBµV (53 dBmV) Real C/N ratio 62 dB C/N ratio measured > 50 dB The C/N measurement ranges and the accuracy of the measurement are described in Appendix E. E xample 9.
  • Page 23 4.2.4 M easurement of digital channels 4.2.4.1 P ower measurement of digital channels P R O M AX -6 directly provides the power measurement for QAM digital channels with a bandwidth of 7 or 8 MHz as described below: Select digital channel measurement mode in accordance with section 4.2.2.
  • Page 24 When pressing the C /N [14] key, the P R O M AX -6 automatically measures the channel power level, the noise level outside the channel (at a lower frequency than the main carrier and defined through the F3 function) and shows the value of the C/N ratio in the display.
  • Page 25 4.2.4.2.1 F3 function: Frequency shift for the C /N measurements To select the frequency shift in the C/N measurement, press the FCT [13] key, then use the rotary encoder to select the F3 function and press the FCT key [13] again.
  • Page 26 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...
  • Page 27 4.2.4.2.3 M easurement of the C /N ratio with adjacent channels present To perform this measurement, proceed as follows: 1) Select the digital channel measurement mode. 2) Tune the main carrier of the channel and wait a few moments until the reading level stabilises.
  • Page 28 (D24, channel adjacent to D25) D.24 (Adjacent channel present) D.25 (Frequency shift selection) 4.00 Display appears after about 5 seconds.
  • Page 29 4.2.5 Function key The FCT key enables the user to access a menu with 3 configuration functions: F1 , F2 and F3 (the last one explained in the C/N ratio measurement for digital channels paragraph). 4.2.5.1 F1 function: S ound demodulation This function selects three kinds of sound demodulation together with the disconnection of the sound itself.
  • Page 30 The diagram below shows the order of selection using the rotary switch of the FCT (F1) function. Figure 6.- F1 function menu. 4.2.5.2 F2 function: S ound subcarrier This function enables the user to vary the frequency of the sound subcarrier from 4 to 9 MHz, in 62.5 kHz steps.
  • Page 31 E xample 14 . Changing the sound subcarrier frequency from the standard value to 5.74 (Zweiton Stereo). 5.75...
  • Page 32 1) Prior to connecting the equipment to a PC, disconnect both from their respective power supplies. 2) Connect the end of the connection cable corresponding to the P R O M AX -6 to connection [6] and the other end to the parallel port of your computer.
  • Page 33 5 M AIN T E N AN C E This part of the manual describes the maintenance procedures and the localization of faults. 5.1 Instructions for returning by mail Instruments returned for repair or calibration, either within or outwith the guarantee period, should be forwarded with the following information: Name of the Company, name of the contact person, address, telephone number, receipt (in the case of coverage under guarantee) and a description of the problem or the service...
  • Page 34 AP P E N D IX E S AP P E N D IX A M E AS U R E M E N T O F TH E V ID E O C AR R IE R LE V E L (C - AN ALO G U E C H AN N E LS - A) N egative V ideo M odulation (P AL/N TS C ) The measurement of the video carrier level is carried out taking the modulation...
  • Page 35 AP P E N D IX B M E AS U R E M E N T O F TH E AD JAC E N T C H AN N E L LE V E L The user can obtain the ratio of the video carrier amplitudes of two consecutive channels.
  • Page 36 AP P E N D IX C M E AS U R E M E N T O F TH E R E LATIV E V ID E O / AU D IO LE V E L (V /A) -AN ALO G U E C H AN N E LS - V / A = A (dB)
  • Page 37 TV it is usual to refer the noise level to a bandwidth of 5 MHz. If the measurement is reduced to a different bandwidth, the user must apply a simple correction. The P R O M AX -6 takes the measurements in a noise bandwidth of 5 MHz. C/N = C...
  • Page 38 AP P E N D IX E C AR R IE R /N O IS E M E AS U R E M E N T S (C /N ) -AN ALO G U E C H AN N E LS - E xample: Suppose that the video carrier level in a channel, for instance the 45, is of 25 dBmV, from the diagram we can deduce that the measurement...
  • Page 39 Noise power in a 1 Hz bandwidth Symbol rate Number of points of the constellation Bandwidth For DVB-C, 64 QAM, Rs=6.875 Mbaud, BW=8 MHz, C/N (dB) =E (dB) + 7.12. ≈ 16 dB. Therefore C/N ≈ 23 dB. For a BER of 1E-4, E...