5 - 12 WS80A Service Manual
▌ Operational Principles
High Voltage Switching Process
WS80A supports 128 Channels and uses up to 192 Element Probes. A separate element
selection is required because Pulser and Receiver circuit of BF (Beamformer Board) have
only 128 channels. Element Selection uses 24 of High Voltage Switches and switching is
carried with the control signals transmitted from the Control Logic (CPLD) of BF
(Beamformer Board). The Control Signal is connected through Mother Board Connector.
The inner structure of the High Voltage Switch consists of Shift Register and High Voltage
FET.
High Voltage Switching Process
It consists of a circuit to select one probe out of 4 probes. It can use the relay of the latched
type to select a probe chosen by user.
The relay is operated by the probe select signal transmitted from the control logic (CPLD)
of CW (Continuous Wave Board). Probe Select signal is connected through the Mother
Board Connector.
CW Probe Switching
Steered CW Switching: Steered CW has, separate from the Beam former Board, Tx 29CH
and Rx 29CH and, by using Not latch Relay, it converts the signal line from Phased Array
Probe to the CW Board at Steered CW Mode. Because it has 29CH, there are 15
AGN20012 for CW Tx and there are 15 AGN20012 for CW Rx.
Static CW Switching:Static CW, separate from the Beam Former Board, has Tx 1CH and
Rx 1CH. At Stactic CW Mode, the signal lines from Pencil Probe are connected directly to
the CW Board without Relay.
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