Power - JVC SW-D7000U Instruction Manual

SW-D7000U, 9CH. COLOR VIDEO MULTIPLEXER
The VEXT input (camera switch input) is for connecting from the VCR to your multiplexer. The VCR
uses it to tell the multiplexer each time it has recorded an image. The multiplexer then transmits the
next image on its VCR record output (VIDEO IN on the VCR). This way the VCR controls the
multiplexer's recording speed. Connect the VEXT input (Pin 24) and one of the grounds pins to your
VCR.
This facility is often referred to as a camera switch output, Rec trigger output, or similar, (see your
VCR instructions). It is especially useful on VCRs with dual recording speeds (alarm and normal)
because the multiplexer will automatically follow.
NOTE: Some time-lapse VCR's do not transmit a VEXT signal in real time mode (2 hour NTSC).
In these cases, if you are using the VEXT input, select the same recording speeds in both
the Alarm Record Speed and Normal Record Speed menu settings in the RECORD
OPTION in the MAIN MENU.
The VEXT input accepts:
" TTL, field synchronized, negative going pulse, duration 2-5ms
" HIGH level, +4.5V to +5.5V
" LOW level, 0V
The multiplexer can be set to trigger off the negative or positive going edge (VEXT Pulse Edge in the
RECORD menu).
NOTE: On power up, the auto-detection circuit will wait about 15 seconds to check if the VCR
starts to output a switch pulse. The period of 15 seconds is approximately the period
between switch pulses when the VCR is running in 960-hour mode. During this brief time
the multiplexer will not switch cameras at all unless a switch pulse is detected. If the
switch pulse ceases, the multiplexer will also take about 15 seconds to determine that it
has in fact stopped and not just changed to 960-hour mode.

2.10 POWER

The multiplexer is supplied with a DC 12V class 2 output; AC 240 or 110V ±10%, 50 or 60Hz, input,
external power supply. Its maximum power consumption is 40W.
DO NOT
use any other power supply.
DO NOT
connect the power until you have read the section Power Up and Tests in Section 4.1.
NOTE: The manufacturer accepts no responsibility for any damage caused by the use of any
other power supply.
JVC PROFESSIONAL, IMAGING PRODUCTS 17