ASTEL TRP 101, Руководство по эксплуатации

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7
adjusted sync. pulse TP4 adjustment TC1 adjustment
Fig. 1: Sync. pulse correction
Table 1
CABLE SECTION I (SW1-SW6) SECTION II (SW7-SW12)
TYPE INSULATION
ZL/
Ω
a5MHz/km 10 dB 20 dB 10 dB 20 dB
P paper 150 51 dB 2 4 1 2 6 8 10 7 8 12
P paper 125 35 dB 2 4 6 1 2 5 8 10 12 7 8 11
P paper 125 33 dB 2 4 6 1 2 4 5 8 10 12 7 8 10 11
P paper 125 30 dB 2 4 6 1 2 4 5 8 10 12 7 8 10 11
Y PVC 90 65 dB 2 4 6 1 2 4 5 8 10 12 7 8 10 11
Y PVC 100 40 dB 2 4 6 1 2 3 5 8 10 12 7 8 9 11
2Y,2YF PE 130 40 dB 2 4 6 1 2 5 8 10 12 7 8 11
2Y,2YF,02Y PE 135 30 dB 2 4 6 1 2 4 5 8 10 12 7 8 10 11
2Y,2YF,02Y PE 135 24 dB 2 4 5 1 2 3 4 5 6 8 10 11 7 8 9 10 11 12
02Y PE 140 21 dB 2 4 5 1 2 3 4 5 6 8 10 11 7 8 9 10 11 12
Example 1:
Cable specifications: Z
L
=125
Ω
, a
5MHz/km
=30 dB, paper insulation, cable length L=500 m.
(1) a
5MHz
=a
5MHz/km
x L=15 dB
(2) In Table 1 find column 10 dB in SECTION I or in SECTION II .
Switch-on the switches 2, 4 and 6 or 8, 10 and 12 (page 5).
(3) Do the fine adjustment (+5 dB) with TC1, TC2, TC3, TC4 and TP4.
Example 2:
Cable specifications: Z
L
=100
Ω
, a
5MHz/km
=40 dB, PVC insulation, cable length L=1000 m.
(1) a
5MHz
=a
5MHz/km
x L=40 dB
(2) In Table 1 find column 20 dB in SECTION I and in SECTION II .
Switch-on the switches 1, 2, 3, 5, 7, 8, 9, and 11 (page 5).
(3) Do the fine adjustment with TC1, TC2, TC3, TC4 and TP4.
Note:
•
It is not necessary to keep the instructions in Table 1 strictly in the practical use.