SEFRAM 7848B User manual

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7848B
FIELD STRENGHT METER
USER MANUAL
This product contains one or more programs protected under international and US copyright laws as un-
published works. They are confidential and proprietary to Dolby laboratories. Their reproduction or disclo-
sure, in whole or in part, or the production of derivative works there from without the express permission of
Dolby Laboratories is prohibited. Copyright 2003-2005 by Dolby Laboratories. All rights reserved.

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Revision follow-up
Version / Date
Modified chapters
Nature of modification
1.0 / January 2020
All
Creation of the document

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Thank you for purchasing this SEFRAM product and therefore trusting our company. Our different teams (research
department, production, sales department, after-sales service…) are aiming at satisfying your wishes by designing
and updating very advanced appliances.
To obtain the best performance from this product please read this manual carefully.
For more information please contact our different services
04 77 59 01 01
E-mail Sales department: [e-mail]
E-mail After-sales: [e-mail]
E-mail Technical support: [e-mail]
Fax: [phone]
Web: www.sefram.com
Copyright Sefram, 2020. All rights reserved.
Any total or partial reproduction of this document must be submitted for Sefram written authorisation.

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GUARANTEE
Your instrument is guaranteed for one year for labor and parts against any manufacturing defect and/or functioning hazard.
This guarantee extends from the delivery date and ends 365 calendar days later.
In case of guarantee contract, this will cancel or replace these guarantee conditions here above.
The guarantee conditions by SEFRAM are available on the website www.sefram.com. The general guarantee conditions
should prevail on the following conditions that they sum up.
This guarantee does not cover the result of any abnormal use, handling mistake or mistake in the storage conditions outside the
defined range.
In case of application of the guarantee, the user shall return, at its own expenses, the relevant appliance to our factory:
SEFRAM Instruments & Systèmes
Service Après-vente
32, Rue Edouard MARTEL
BP 55
42009 SAINT-ETIENNE CEDEX 2
And add a description of the observed breakdown to the appliance.
The standard supplies provided with the appliance (cables, outlets…), the consumables (batteries …) and the optional supplies
(suitcases…) are guaranteed for 3 months against any manufacturing defect.
Such items as a suitcase, a LCD screen or a touchpad are guaranteed only for a normal use.
The guarantee does not cover wearing, accidental breaks or consecutive to a shock or any abnormal use.
The factory options integrated to the appliance are guaranteed for the same duration as the appliance itself.
In case of replacement or repair of the product, the remaining guarantee duration shall be:
-The remaining duration of the guarantee if the appliance is still under guarantee
-If the guarantee duration is less than 90 days, the replaced part is guaranteed for 90 days
Any replacement part becomes the property of the user and the exchanged parts become the property of SEFRAM.
In case of intervention by an insurance company, the product becomes the property of the insurance company upon its exclu-
sive request. Else, it shall remain property of the user.
The guarantee covers exclusively the materials manufactured and provided by SEFRAM.
Any intervention by the user or any third party without prior authorization by the company voids the guarantee.
The user shall be responsible for the return of its appliance to our site. Hence, it shall provide for a conditioning that shall cor-
rectly protect the appliance while shipping. It shall subscribe, at its own expenses, any insurance required for the transport.
The SEFRAM company reserves the right to refuse any product wrongly conditioned and not to take in charge any break con-
secutive to the transport.
Particular case of the battery: There is a Li-ion battery as a standard equipment of this appliance. It shall not be transported
outside the appliance. In no case shall the user replace it. Its replacement in the factory is necessary to check the charge system
and the protective securities.
What to do in case of malfunction?
In case of malfunction or for any advice for use, please contact the technical support by SEFRAM Instruments & Systèmes:
04 77 59 01 01
A technician shall answer you and give you any information required to solve your problem.

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What to do in case of failure?
In case of failure of your appliance, please contact the technical support: 04 77 59 01 01
Some advice!
Some technical help!
SEFRAM Instruments & Systèmes commits itself to help you on the phone about the use of your appliance.
Please call or Technical Support:
04 77 59 01 01
Or e-mail:
[email protected]
We thank you for your trust.
METROLOGY
The meteorological conditions of your measurement instrument are defined in the specifications of this notice. Climate and
environmental conditions restrict the specifications of your Field Strength Measurer (MDC). SEFRAM checks the characteris-
tics of each appliance one by one on an automatic bench during its manufacture. The adjustment and control are guaranteed
under conditions of the ISO9001 certification by facilities in connection with the COFRAC (or equivalent in the context of
ILAC reciprocity).
The specified characteristics are considered stable for a period of 12 months from the first use under normal conditions of use.
We recommend a check after 12 months and max. 24 months of use, then every 12 months after 24 months.
For any check of the characteristics, the following average climate conditions shall be maintained (23°C+3°C –50(+20)%RH).
The MDC should have been working for 0,5 hour before check.
We recommend that you have this control made by our after-sales service (Service Après-Vente) for the best service and
preservation of the measuring quality of your instrument.
When a MDC returns to SEFRAM, maximum service is provided with internal updating according to the required adjustments
and software updates. In case of shift in the characteristics, your instrument shall be adjusted to recover its original characteris-
tics.
PACKAGING
The packaging of this product is fully recyclable. Its design allows the transport of your instrument under the best possible
conditions. Please note that the original packaging should be additionally wrapped in case of transport by air, road or postal.
SPARE PARTS
According to the consumption law of March 17, 2014, Article L111-3 and Decree 2014-1482 of 09/12/2014, SEFRAM in-
forms you of the availability of spare parts of products placed on the market as of March 1, 2015:
Spare parts are not available to the consumer. SEFRAM offers the supply of spare parts during repair by its service.
Consumable parts are provided according to the legislation applicable to them (case of batteries).
SEFRAM is committed to providing parts or alternatives for a period of at least 2 years beyond the warranty period.

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TABLE OF CONTENTS
1Important information..........................................................................................................9
1.1 Particular precautions.....................................................................................................................................9
1.2 Security instructions.......................................................................................................................................9
1.3 Symbols and definitions .................................................................................................................................9
2Quick start-up.....................................................................................................................11
2.1 Presentation of the appliance.......................................................................................................................11
2.2 Signal spotting..............................................................................................................................................12
2.2.1 Checking a terrestrial antenna..............................................................................................................12
2.2.2 Installation of a terrestrial antenna........................................................................................................13
2.2.2.1 Use of the spectrum.......................................................................................................................14
2.2.2.2 Use of the Antenna pointing ..........................................................................................................16
2.2.3 Installation of a satellite dish.................................................................................................................18
3Presentation .......................................................................................................................20
3.1 General.........................................................................................................................................................20
3.2 Description of the appliance.........................................................................................................................21
4Power-up.............................................................................................................................22
4.1 Battery..........................................................................................................................................................22
4.2 Battery charge..............................................................................................................................................22
4.3 External power supply..................................................................................................................................23
4.4 Turning the appliance on and off..................................................................................................................23
5Man-machine interface......................................................................................................24
5.1 Content of the screen...................................................................................................................................24
5.2 Changing name or value..............................................................................................................................26
5.2.1 Changing inside a table ........................................................................................................................26
5.2.2 Change with selection...........................................................................................................................27
5.2.3 Change with virtual keyboard................................................................................................................27
5.3 List of setups ................................................................................................................................................28
6SATELLITE mode...............................................................................................................29
6.1 Check Sat.....................................................................................................................................................30
6.1.1 Updating satellite...................................................................................................................................31
6.1.2 Check Sat function................................................................................................................................31
6.1.3 Checking the aligned satellite ...............................................................................................................33
6.1.4 Recall ....................................................................................................................................................33
6.2 Autoset .........................................................................................................................................................34
6.3 Measures –TV –Spectrum..........................................................................................................................35
6.3.1 Autolock function...................................................................................................................................36
6.4 The library page ...........................................................................................................................................36
6.4.1 Creation or modification of setups in the library....................................................................................37
6.5 LNB - DiSEqC ..............................................................................................................................................37
6.6 Configuration................................................................................................................................................37
7TERRESTRIAL mode .........................................................................................................38
7.1 Terrestrial check...........................................................................................................................................38

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7.2 Autoset .........................................................................................................................................................42
7.3 Measures –TV –Spectrum..........................................................................................................................44
7.3.1 AutoLock function..................................................................................................................................44
7.4 Terrestrial setup: ..........................................................................................................................................45
7.5 Creation or modification of setups in the library...........................................................................................45
7.6 Echo / Guard interval....................................................................................................................................46
7.7 Configuration................................................................................................................................................48
8Measures ............................................................................................................................49
8.1 Setup modifications......................................................................................................................................49
8.2 Level measurements....................................................................................................................................49
8.3 Satellite band................................................................................................................................................50
8.1 Terrestrial band............................................................................................................................................51
8.2 Thresholds....................................................................................................................................................51
8.1 Digital measurements...................................................................................................................................52
8.2 DVB-T...........................................................................................................................................................53
8.3 DVB-T2 / T2 Lite...........................................................................................................................................54
8.4 DVB-S / DSS................................................................................................................................................55
8.5 DVB-S2 / S2X...............................................................................................................................................56
9Spectrum analyser.............................................................................................................57
10 Image and Sound...............................................................................................................58
10.1 Digital TV..................................................................................................................................................58
10.2 External analogue video...........................................................................................................................58
10.3 Full screen mode......................................................................................................................................59
10.4 Audio.........................................................................................................................................................59
10.5 Table of services.......................................................................................................................................60
11 LNB –DiSEqC (Satellite mode).........................................................................................61
11.1 Power ON .................................................................................................................................................61
11.2 Switches (satellite remote power supply in expert mode)........................................................................63
11.3 Positionner................................................................................................................................................65
11.4 DCSS........................................................................................................................................................67
11.4.1 Influence of the DCSS on the spectrum analyzer.................................................................................69
12 Configuration .....................................................................................................................70
12.1 Language..................................................................................................................................................70
12.2 Measurement unit.....................................................................................................................................70
12.3 Frequency map.........................................................................................................................................71
12.4 Update ......................................................................................................................................................71
12.5 Factory recovery.......................................................................................................................................71
12.6 Configuration import/export ......................................................................................................................72
13 Software update.................................................................................................................73
14 Connection of the appliance to a PC................................................................................74
15 Displayed messages..........................................................................................................76
15.1 Alert messages.........................................................................................................................................76
16 Maintenance .......................................................................................................................78

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17 Technical specifications....................................................................................................80
17.1 Technical specifications............................................................................................................................80
17.2 Digital measurements...............................................................................................................................81
17.3 Divers........................................................................................................................................................83
17.4 General specifications ..............................................................................................................................84
17.5 Accessories ..............................................................................................................................................84
17.6 dBµV, dBmV, dBm conversion.................................................................................................................85
17.7 Typical values for measurements.............................................................................................................85

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1 Important information
Please read carefully the following instructions before using your appliance.
1.1 Particular precautions
Do not use the product for any other use than specified.
Use the provided charger unit to prevent any deterioration of the appliance and guarantee its measurement
characteristics. Charging battery with appliance switched off only (room temperature 0-35°C)
Do not use in a wet environment.
Do not use in an explosive environment.
In case of failure or for the maintenance of the appliance, only a qualified personal shall be entitled to work on
it. In such a case, it is required to use Sefram spare parts.
Do not open the appliance: risk of electric shock.
You should use the F/F adaptor provided with your measuring instrument. Any other adaptor could damage
your appliance and jeopardizes the guarantee.
Do not use gloves, stylus or any other object on to the touchscreen. Handle the screen carefully.
1.2 Security instructions
For a correct use of the appliance, it is necessary that users abide by the security and use instructions de-
scribed in this manual.
Specific warnings appear all along this manual.
In case of need, warning symbols are displayed on the appliance:
1.3 Symbols and definitions
Symbols in this manual:
Remarque : signale des informations importantes.
Key or press zone
Window or display zone showing up after the operation achieved

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Symbols on the appliance:
Attention: Refer to the manual. Shows a risk of damage for the material connected to the in-
strument or to the instrument itself.
Ground: Grounded accessible parts.
Product for recycling.

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2 Quick start-up
Charge the device only when the device is off.
Charge the device only with the provided power supply block.
2.1 Presentation of the appliance
Important keys:
The 7848B is an appliance with a capacitive touchscreen. This requires a soft handling. No glove and no sty-
lus should be used, so that the triggering should be taken into account.
You will recognize the « keys » by their dark grey color (example: the home key: )
You may also access tables by pressing lines (on white or yellow)
Welcoming page:
Press button ON/OFF
To turn the device on
RF connector for use with the
F/F adaptor provided with the
appliance.
Pour brancher le signal à analyser
HOME
Access to the main menu

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Attention: To exit a window like in this example below, press the key:
2.2 Signal spotting
The 7848B allows spotting signals in terrestrial or in satellite mode.
In the following chapter, we will see how to spot a signal on three types of installation:
Checking of a terrestrial antenna (the installation has already been made).
Installation of a terrestrial antenna.
Installation of a satellite dish.
2.2.1 Checking a terrestrial antenna
In this case, the Autoset function allows a scan of the channels that the antenna detects.
Plug the cable of your antenna to the 7848B (take care to use an adequate adaptor)
Turn on your appliance, then select terrestrial mode :
The Home page appears on screen. Press Autoset
The scan should range from the E21 to the E69 channels, frequency range Europe (you may reduce the
number of channels to scan if you know the range of the emitter where the antenna points at: the scan will
be faster)

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Press START. The appliance searches until the end of the scan and turns directly to the Measures page. If
no channel has been found, see the next chapter.
On this new page, press Prog, select the channel that you want to display. Then you can press TV key to
watch the image of the signal.
2.2.2 Installation of a terrestrial antenna
To install a terrestrial antenna, you have two methods:
Use of the spectrum
Use of the terrestrial check

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2.2.2.1 Use of the spectrum
Plug the cable of your antenna to the 7848B (take care to use an adequate adaptor)
Turn your appliance on. Press the Measures-TV-Spectrum key
Press the Spectrum touch:
Access to full SPAN mode
Adjust the antenna to get the most powerful signal possible

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You can now display the level, the BER/MER of the signal selected on the same page by pressing the
key.

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2.2.2.2 Use of the Antenna pointing
The appliance gets an antenna pointing mode in order to regulate quickly and easily your terrestrial antenna.
To access to the antenna pointing mode menu from the HOME page, press
The following page appears :
Set your emitter name :

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Enter 4 frequencies of the emitter you want to check.
You can find many different French transmitters on the website :
https://www.matnt.tdf.fr/
Slowly orientate the antenna until hearing the locking melody and getting the best quality

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No transmitter found, bad reception quality → red smiley
Average reception quality (< 50%) → orange smiley
Good reception quality (> 50%) → green smiley
2.2.3 Installation of a satellite dish
Connect the satellite dish to the appliance.
Select satellite mode and put into service the Remote power supply by pressing « yes » when the following
message appears:
Press to access the Check Sat mode
(The appliance already includes a list of satellites).
Select a satellite like in the example below (here Astra1):

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Slowly orientate the satellite dish until hearing the locking melody and getting the best quality
No found transponder → red smiley
Average reception quality (< 50%) → orange smiley
Good reception quality (> 50%) → green smiley
Reminder: transponder = satellite channel
To check if the aimed satellite is the right one: press the NIT key
The appliance searches the MPEG NIT table on one of the 4 transponders and displays the name of the sat-
ellite:
Attention:
To identify a satellite, you must be locked on all 4 transponders. (Quality > 0)
However, some transponders are regularly modified. See the frequency range of the
satellite when a transponder does not seem to work.
Some switches or LNB work only with DiSEqC commands. In this case, position the
band (OL) and the polarization on DiSEqC at the Configuration page LNB-DiSEqC.
(Attention: the Check Sat is slower when using the DISEqC command).
Attention: The displayed name depends on the content of the MPEG NIT table.
Some distributors provide no (or poor) such table.
The displayed information may be wrong.

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3 Presentation
3.1 General
-The field strength meter 7848B is an appliance designed for the installation and maintenance of any broad-
casting and reception installations of analogical and digital terrestrial television channels or satellites.
- The band ranges between 5 MHz to 2400 MHz; this allows accurate measurements on all analogical tele-
vision standards, FM carrier waves and the various digital standards DVB-T/T2, DVB-S/S2, DSS.
- They do Level measurements in average, peak and power according to the selected standard.
- Equipped with an efficient Bit Error Rate measurement (various BER, MER), they allow the full validation
of digital transmissions DVB-T/T2, DVB-S/S2 and DSS.
- The display of Echoes and pre-echoes in DVB-T/T2 gives a complete analysis of the digital signals.
- You can display the digital terrestrial or satellite TV under SD or HD.
-You can hear digital sound through integrated loudspeakers.
- Designed for use on field, they are compact (less than 2 kg, battery included), autonomous (battery pack
and quick charger), equipped with a LCD 7’’ touchscreen (capacitive).