7700 MultiFrame Manual
7700ADA7 Analog Video Distribution Amplifier
7700ADA7 - 4
Revision 1.2.2
4.
STATUS LEDS
The 7700ADA7 has two LED Status indicators on the front card edge to show operational status of the
card at a glance. Figure 6-1 shows the location of the LEDs.
Two large LEDs on the front of the board indicate the general health of the module.
LOCAL FAULT:
This Red LED indicates poor module health and will be On if a local input power
fault exists (i.e.: a blown fuse). The LOCAL FAULT indication can also be reported
to the frame through the FRAME STATUS jumper.
MODULE OK:
This Green LED indicates good module health. It will be On when the board power
is good.
5.
CIRCUIT DESCRIPTION
The input signal enters the board through a BNC with isolated ground so that balanced input processing
may be done to remove any common mode hum that may have been added to the signal and ground
shield. On-board jumpers allow you to configure the input impedance and input coupling (AC/DC).
An adjustable gain stage feeds three separate OP-Amps and drives the seven output BNC's with 75-Ohm
output impedance.