GOLDENEAGLE TV 6.0.x user manual
– 07/2012
Page 8
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–
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1.4.2. Operating recommendations
So as to guarantee acquisition performance, stability of supplied information and reliability, we recommend
you follow the conditions below:
The unit must be installed in a location with steady air flow, either forced or natural. If several units
are stacked up, they should be spaced by at least 1 U to allow air flow and prevent overheating.
It is strongly recommended that the location is not subject to a high humidity level (>70%), and to
avoid high salinity or chlorinated environments.
It is strongly recommended that the location is not exposed to a high volume of dust.
Connection to the mains should be done according to applicable installation codes:
outlets in good working conditions to insure a reliable contact,
correct voltage, without fluctuation and stable over time (power conditioner recommended),
sufficient power.
The quality of the communication network (modem, ADSL, WIFI, WIMAX) is very important. Modem
correctly installed, properantenna installation in case of WiFi and WiMax,
1.4.3. Monitoring Specifications:
Parameter based on the
ITU-T
recommendation
J.64.
Amplitude measurement: Ref. ITU-T recommendation J.64 extracts.
-
White level: The measure corresponds to the chapter 2.1 of the recommendation.
Recommendation extract:
2.1
Luminance bar amplitude
The luminance bar amplitude is defined as the difference between the level corresponding to the
mid-point of the bar (element
B
2
) and the level corresponding to a point immediately following the composite
pulse (element
F
). These points are shown as b
2
and b
1
respectively in Figs. 1 and 2. It is to be expressed
as a percentage of the nominal bar amplitude (0.7 V for 625-line signals, 0.714 V for 525-line signals).
-
Base line distortion: The measure corresponds to the chapter 2.4 of the recommendation.
Recommendation extract:
2.4
Base-line distortion
The base-line distortion is defined as the difference between the levels of the signal at point b
7
,
which is located after the mid-amplitude point of the trailing edge of the bar (element
B
2
) at a distance of 400
ns for 625-line systems and 500 ns for 525-line systems (see Figs. 1 and 2), and at a reference point b
1
located before the beginning of the staircase in line 17 (see also Figs. 1 and 2).
The base-line distortion is expressed as a percentage of the luminance bar amplitude. It is to be
measured after the bandwidth of the signal has been limited (see Note). The sign of the difference is positive
if the signal level at point b
7
is higher than the level of reference point b
1
.
Note.
– Limitation may be achieved by the use of a network, the design of which is based on “Solution
3” [Thomson, 1952], having its first zero at 3.3 MHz, or by an equivalent technique.
-
This development makes it possible to obtain a percentage value, not an absolute level.
-
This measures are performed with video line number 17 in PAL BG mode
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