GE Vivid 7, Руководство по обслуживанию

Страница: 376 / 858

GE H
EALTHCARE
D
IRECTION
FC091194, R
EVISION
11 V
IVID
7 S
ERVICE
M
ANUAL
5 - 30 Section 5-3 - a Front-End Processor (FEP)
5-3-14-3 Signals from Pedof Probe
The Pedof signals are connected via two dedicated channels on the XD bus
PW Mode
• The Pedof signals (two channels) are fed via a Transmit/Receive (T/R) switch and relays to three
preamplifiers for each Pedof channel.
• From the preamplifiers the signal go to Analog Beamformers.
• From the Analog Beamformers the signals are fed via a multiplexer for demodulating.
• The demodulated (I and Q) signals are then converted from analog to digital in 12 bit A/D
converters.
• The output from the A/D converters (MLA0 and MLA1) are then output to the Beamformer boards.
CW Mode
• In CW mode, the CW signal is amplified by a dedicated preamplifier (not shown in block diagram)
before multiplexing and demodulating.
• The demodulated (I and Q) signals are then converted from analog to digital in 12 bit A/D
converters.
• The output from the A/D converters (MLA0 and MLA1) are then output to the Beamformer boards.
5-3-14-4 Location in the Unit
NOTICE Please be careful about the positions when replacing the TX card and RX card. The position of the two
cards are interchanged between FEP1 and FEP2.
Figure 5-22 RX128 Board: Location in Unit
RX128 Board
FRONT OF
SCANNER
Front-End Rack Version 1 Front-End Rack Version 2
RX128 Board
FRONT OF
SCANNER