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VISTEK V1638, Руководство пользователя

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VISTEK V1638 Скачать руководство пользователя страница 8

VISTEK V1638 analogue audio 

distribution amplifier 

 

 

8 

 

Issue 8

 

2.4 

Lowpass Filter 

 
The lowpass filter -3dB rolloff point on each input channel  may be set to 60kHz or 120kHz.  The 120kHz 
position may be useful in applications where the V1638 is required to pass timecode spooling.  The filter is 
set by jumpers, as per the table below.  Note that the filters of the two channels may be set independently.   
Figure 2.4.1 shows the location of the jumpers. 
 

-3dB rolloff point 

Jumpers 

Channel A  f

-3

 = 60kHz  

LK3 CLOSED 

Channel B  f

-3

 = 60kHz 

LK2 CLOSED 

Channel A  f

-3

 = 120kHz 

LK3 OPEN 

Channel B  f

-3

 = 120kHz 

LK2 OPEN 

 
The figure below shows the V1638 and the location of all the jumpers referred to in Section 2.2-4. 

 

Figure 2.4.1 

 

Jumper and Switch locations 

F

ron

t 

P

anel

R

ea

r 

C

onne

ct

or

LK1

LK6

LK2

LK3

1 2 3 4

SW4

ON

 

Содержание V1638

Страница 1: ...1 VISTEK V1638 ANALOGUE AUDIO DISTRIBUTION AMPLIFIER USER GUIDE www pro bel com ...

Страница 2: ... 2 INSTALLATION 4 2 1 Rear Panel Connections 4 Table 2 1 1 5 Figure 2 1 2 6 Table 2 1 2 6 2 2 Input Impedance 7 2 3 Input Mode 7 2 4 Lowpass Filter 8 Figure 2 4 1 8 3 OPERATION 9 3 1 Front Panel 9 3 2 LED Indications 9 3 3 Gain Adjustment 10 3 4 Monitoring Jack 11 3 5 Dart Interface 11 ...

Страница 3: ...coupled channels Zin 20kΩ or 600Ω max recommended input is 20dBu OUTPUTS Monitoring 3 5mm Stereo jack socket 18dBu into 600Ω w r t main outputs Main outputs 2x5 x balanced analog channels Zout 50Ω max output 28dBu into 10kΩ Resistor coupled expander panel A rear panel expander is available which is fitted with a 96Way DIN 41612 connector and comes complete with a locking cable mounted 96Way DIN416...

Страница 4: ...B rear panels are shown below 1U panels are similarly marked Table 2 1 1 details connections to these standard panels Figure 2 1 2 and Table 2 1 2 describe signals and connections to the DIN41612 cable mounted plug supplied with the resistor coupled expander panel Note that these pin numbers refer to those stamped on the back of the supplied cable mount connector with solder bucker terminals A IN ...

Страница 5: ...rce Channel B differential input B In 7 Zin 20kΩ 600Ω max input 28dBu A1 out 14 V1638 Group A outputs A1 out 1 Zout 50Ω max output 28dBu A2 out 16 A2 out 3 A3 out 17 A3 out 4 A4 out 18 A4 out 5 A5 out 19 A5 output is not available on screw terminal A5 out 6 rear modules Only DSUB rear module has A5 GND 2 7 13 15 V1638 All screens from V1638 should be grounded 20 on the V1638 o p connector B1 out 2...

Страница 6: ... out B51 out B11 out 2 A11 out B51 out B11 out 3 A12 out B52 out B12 out 4 A12 out B52 out B12 out 5 A13 out B53 out B13 out 6 A13 out B53 out B13 out 7 A14 out B54 out B14 out 8 A14 out B54 out B14 out 9 A21 out GND B21 out 10 A21 out GND B21 out 11 A22 out GND B22 out 12 A22 out GND B22 out A1 A2 A3 A4 A5 A11 A12 A13 A14 A21 A22 A23 A24 A31 A32 A33 A34 A41 A42 A43 A44 A51 A52 A53 A54 B1 B2 B3 B4...

Страница 7: ...ould 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 600Ω balanced line the input impedance may be set to 600Ω 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 ju...

Страница 8: ...by jumpers as per the table below Note that the filters of the two channels may be set independently Figure 2 4 1 shows the location of the jumpers 3dB rolloff point Jumpers Channel A f 3 60kHz LK3 CLOSED Channel B f 3 60kHz LK2 CLOSED Channel A f 3 120kHz LK3 OPEN Channel B f 3 120kHz LK2 OPEN The figure below shows the V1638 and the location of all the jumpers referred to in Section 2 2 4 Figure...

Страница 9: ...have a fast attack and 0 8s retriggerable hold characteristic The output signal is monitored and the LEDs will trigger at 28dBu just before the onset of clipping The LED will be on continuously of sustained clipping occurs A yellow LO I P LED is provided for each channel These have a slow attack 0 8s and fast decay characteristic The input signal is monitored and the LEDs will trigger when the sig...

Страница 10: ...96 mute 0 0 1 88 1 0 5 2 80 2 1 0 3 72 3 1 5 4 64 4 2 0 5 56 5 2 5 6 48 6 3 0 7 40 7 3 5 8 32 8 4 0 9 24 9 4 5 A 16 A 5 0 B 8 B 5 5 C 0 C 6 0 D 8 D 6 5 E 16 E 7 0 F 24 F 7 5 It can be seen from the table that the gain applied is the sum of the settings of the COARSE switch and the FINE switch Care should be taken when setting the gains in an application to allow sufficient headroom so that the V16...

Страница 11: ...Bu level on the monitoring output which is designed to be used with professional quality headphones of 300 600Ω impedance eg Sennheiser HD520 3 5 Dart Interface The V1638 has a serial EEPROM for reading and writing card details through the DARTbus in the same manner as other V1600 range cards In addition the unit has several read and write registers which will be discussed Details of the DART inte...

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