Comparison With Pv8000 - Toshiba Aplio SSA-770A Service Manual

No. 2D730-148E*O
(3) Comparison with PV8000
The TR board is equivalent to the PULSER-H in the PV8000, except for the following items.
(1) Number of
transmission/reception
circuit channels per
TR board
(2) Transmission
waveform
(3) Transmission voltage
switching
(4) Transmission pulse
generation method
(5) Reception preamplifier
Aplio
64 CH
Bipolar transmission can be
performed.
The transmission voltage
can be switched for every
rate. (A dual pulser circuit is
mounted.)
The transmission pulse is
generated by using a
transformer to raise the low
voltage.
A new amplifier (RXAR
ASIC) is used. This unit
includes a preamplifier, a
variable gain amplifier, and
an antialiasing filter in a
single package. The
variable gain range is 75 dB.
PV8000
32 CH
Only unipolar transmission can be performed.
(Bipolar transmission cannot be performed.)
The transmission voltage cannot be switched
for every rate. (Only PW and CW
transmission voltage switching can be
pet-formed.)
The transmission pulse is generated by
switching the high-voltage power supply in the
FET.
An antialiasing filter, which is an individual
part, is mounted on the DBF.
The variable gain range is 48 dB.
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