VISTEK V1638, Руководство пользователя

Страница: 7 / 11

VISTEK V1638 analogue audio
distribution amplifier
HU-V1638 7
Cable mounted DIN41612 Type C connector assignments
Pin No.
Row a Row b Row c
13 A23 out + Ain + B23 out +
14 A23 out - Ain - B23 out -
15 A24 out + GND B24 out +
16 A24 out - GND B24 out -
17 A31 out + GND B31 out +
18 A31 out - GND B31 out -
19 A32 out + B in + B32 out +
20 A32 out - B in - B32 out -
21 A33 out + GND B33 out +
22 A33 out - GND B33 out -
23 A34 out + GND B34 out +
24 A34 out - GND B34 out -
25 A41 out+ A51 out + B41 out+
26 A41 out - A51 out - B41 out -
27 A42 out + A52 out + B42 out +
28 A42 out - A52 out - B42 out -
28 A43 out + A53 out + B43 out +
30 A43 out - A53 out - B43 out -
31 A44 out + A54 out + B44 out +
32 A44 out - A54 out - B44 out -
2.2
Input Impedance
The standard setting of differential input impedance of Channel A and Channel B inputs on the V1638 is
20k
Ω , which should be used when the inputs are driven from any direct coupled sources (electronically
balanced or quasi-balanced line drivers with low output impedance.) If the inputs are driven from a 600 Ω
balanced line, the input impedance may be set to 600 Ω by using the jumper settings shown below. Note
that the input impedance of the two channels may be set independently. Figure 2.4.1 shows the location of
the jumpers.
Impedance Jumpers
Channel A Zin = 20k Ω LK6 OPEN
Channel B Zin = 20k Ω LK1 OPEN
Channel A Zin = 600 Ω LK6 CLOSED
Channel B Zin = 600 Ω LK1 CLOSED
2.3 Input Mode
The V1638 Output groups A[1..5] and B[1..5] may each be sourced from Ain, Bin or (Ain + Bin). DIL Switch
SW4 controls the input mode as per the following table. The Ain + Bin mode for a given output group is
obtained by switching on both the Ain and Bin switches. Figure 2.4.1 shows the location of the SW4
switches.
Input Mode SW4 action
Ain => A[1..5] out SW4 - 1 on
Bin => A[1..5] out SW4 - 2 on
Ain => B[1..5] out SW4 - 3 on
Bin => B[1..5] out SW4 - 4 on