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2. GENERAL DESCRIPTION AND PRINCIPLE OF OPERATION 

2.1. Introduction 

This Operating Manual is intended for introducing the design, functions, and basic 

instructions related to operation and servicing of the IT-081 TV Level Meter (Meter). 

The IT-081 is designed for control and adjustment of television and broadcasting 

distribution networks as well as of separate components of such networks, or other 
electronic devices. 

The Meter allows measurement of channel power and parameters of TV 

signal.

 

The Meter can be used both in laboratory, powered by an external power source, and 

in field, powered by batteries.

 The Meter can also operate as a part of Return Path Test and 

Measurement Set.

 

The reliability of the IT-081 is ensured by fulfillment of regular maintenance 

procedures. These procedures and their intervals are described in Section 5. 

 
In this manual the following abbreviations are used: 
- PC - Personal Computer; 
- CD - Compact Disk; 
- LCD - Liquid Crystal Display; 
- ADC - Analog-to-Digital Converter; 
- IF - Intermediate Frequency. 

2.2. Safety Precautions 

Thoroughly inspect the product and carefully read the related documentation to get 

acquainted with all the safety markings and instructions before you start to operate the 
Meter. 

 

WARNING 

Only trained service personnel aware of the hazards involved should perform 

repair on the Meter. 

CAUTION

 Tuning the Meter and replacement of the components that influence the 

accuracy of measurements without service personnel is strictly prohibited, since the 
components used in the Meter are purpose-made and their replacement will result in 
inaccurate operation of the Meter. To exclude the possibility of mechanical damage to the 
IT-081, the instructions regarding the storage and transportation (see Sections 7 and 8) of 
the Meter must be observed. 

2.3. Function 

The IT-081 TV Level Meter belongs to the family of IT-08 measurement instruments 

and is intended for measurement of the video carrier level of standard TV signal. 

The Meter offers the following measurement modes for analog channels: video 

carrier to audio carrier (V/A) ratio, and video carrier to noise (C/N) ratio. For digital 
channels the measurement modes are the following: channel power and C/N ratio.  

The IT-081 can be connected to a personal computer to access additional modes. 

The IT-081 operates in spectrum analyzer mode displayed on the built-in LCD. The Meter 
allows measuring direct and alternating voltage of the remote power supply of the TV and 
broadcasting distribution networks. 

The appearance of the Meter and its components are displayed in figures 2.1 and 

2.2.

 

Содержание IT-081

Страница 1: ...I 081 TV LEVEL METER OPERATING MANUAL...

Страница 2: ...Revision 1 1 of April 4 2016 2...

Страница 3: ...can Measurement Mode 15 4 4 Data Logger Function 16 4 4 1 General Information 16 4 4 2 Channel Plans 17 4 4 3 Limit Plans 19 4 4 4 Channel Data Logger 20 4 4 5 Spectrum Data Logger 22 4 4 6 Memory Man...

Страница 4: ...Resolution 0 11 m IT 086 Optical Power Meter MC 086 module plugged in measuring at 50 dBm to 20 dBm range and wavelengths 1310 and 1550 nm IT 087 DVB C Signal Analyzer MC 087 module plugged in 45 to...

Страница 5: ...you start to operate the Meter WARNING Only trained service personnel aware of the hazards involved should perform repair on the Meter CAUTION Tuning the Meter and replacement of the components that...

Страница 6: ...tegory CAT II Rated operating conditions a ambient temperature from 10 to 40 b relative air humidity not greater than 90 at 25 temperature c atmospheric pressure 84 106 kPa 630 795 mm Hg 2 5 Package C...

Страница 7: ...0 1 dB Accuracy within 30 126 dB V level range 1 5 dB Accuracy at operating temperature 2 2 dB Measurement channel passband for 3 dB level 230 60 kHz Frequency indication 6 characters on LCD Channel...

Страница 8: ...level V A and C N ratios 2 7 2 Block Diagram The block diagram of IT 081 is shown in figure 2 3 Figure 2 3 After the Low Pass Filter LPF the input signal if necessary is reduced by the two Attenuators...

Страница 9: ...has a USB port and an external power source connector The Removable Module connector is located on the back panel The Removable Module has a 75 Ohm input F connector and the connector for connection...

Страница 10: ...able Module software version is other than the software installed the IT 081 will start the program installation process automatically once the Meter is switched on The loading process is indicated by...

Страница 11: ...nit dBuV Press MENU ENTER Then enter Ch plan mode Select the first row All channels using keys and press F4 Select Press MENU ENTER key again In the main menu select the tab with the icons of measurem...

Страница 12: ...channel plan name current time and the battery remaining indicator If the channel plan is not selected the line will show All channels title and in this case the channel modulation type is determined...

Страница 13: ...owing of the signal level value after averaging Off Averaging off x4 Averaging over last 4 measurement reports x8 Averaging over last 8 measurement reports 4 3 2 Level Measurement Mode In this mode th...

Страница 14: ...third one is the point 1 125 MHz shifted down from the first one The measured V A and C N ratio will be indicated on the screen While operating by channel plan the IT 081 offers the capability of sel...

Страница 15: ...t this sweep press AUX key to open the menu with additional set of functions and then press F2 Run key If additional trace showing option is turned on Min or Max values are selected for Hold level par...

Страница 16: ...ger The data logger memory is common for all the directories and is of a dynamic type The memory capacity allows to save up to 32 channel plans up to 8 limit plans up to 130 channel data logger pages...

Страница 17: ...t the channel plan Figure 4 10 Press F1 to open the pop up menu with the list of available commands 1 Edit Viewing and editing of the selected channel plan 2 Rename Editing of the channel plan name 3...

Страница 18: ...annel name 5 Bandwidth channel frequency bandwidth The available range is from 5 00 up to 8 00 MHz with 250 kHz step 6 Noise frequency frequency shift for C N ratio measurement The available range is...

Страница 19: ...it plan Also you can add a new limit plan by pressing F2 Add 4 4 3 2 Editing Limit Plan The screen view of the limit plan is shown in the figure 4 14 Figure 4 14 The table contains the TV channel para...

Страница 20: ...eof Channel Data Logger allows viewing the measurement results and errors in different parameters and uploading the data onto your PC for further processing and report preparation List of Channel Data...

Страница 21: ...ify the errors after the limit test open the table of the detailed channel data F1 key The test parameter table will appear on the screen figure 4 17 Figure 4 17 In this table you can see the paramete...

Страница 22: ...igure 4 19 The screens show the list of spectrum data logger pages For each page the following information is presented status page name date and time of updating and frequency scanning range Press F1...

Страница 23: ...ory can contain different types of files For IT 081 Meter these are channel plan list limit plan list channel data log and spectrum data log Different configurations of IT 08 may have other file types...

Страница 24: ...you to estimate the time remaining for the Meter to operate You should consider that with decrease of air temperature the battery capacity also decreases This should be taken into account when estima...

Страница 25: ...the status field If an error has been detected the indicator will be red and in this case the Meter should be sent to repair service to have the defects corrected 4 5 2 Setting Regional Parameters Re...

Страница 26: ...moment of the last pressing of any key Auto backlight off parameter is for setting of automatic decreasing of the LCD backlight brightness after the selected time interval from the moment of the last...

Страница 27: ...a CD for installation place the CD into the disk drive Press Install ViewIt08C when the disk menu appears If you received the software in some different way just run the Install ViewIt08C exe file c a...

Страница 28: ...mware build for IT 081 Analyzer dated February 28 2012 will have the following name it081_build_120228 bsk2 Also the file name may contain the reference of the firmware application to a certain device...

Страница 29: ...as been operating with the Module of another type or if the versions of the Removable Module applications are different The device will indicate the firmware loading process from the Removable Module...

Страница 30: ...ect the mains adapter If the Meter switches on then the battery voltage has to be tested by means of the self test function Section 4 5 1 2 Low voltage 6 V is evidence that a battery or a number of ba...

Страница 31: ...ordance with the regulations of operation detailed in this Manual The manufacturer will repair or replace without charge at its option any IT 081 TV Level Meter found defective in manufacture within t...

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