Primary Circuit; Sinus Generator; Synchronising; Power Buffer - Addi-Data APCI-3701 Technical Description

APCI-3701
9.3

Primary circuit

9.3.1 Sinus generator

The sinus generator generates a sinus signal for the excitation of the primary
circuit.
The frequency and the amplitude are set through software according to the
connected sensor type.
The frequency can be set with 14 predefined values in a range from
2 to 20 kHz (See Table 4-1).
The amplitude can be set in a range from 0,7 V
The duty cycle is set to 50 % to avoid any distortion of the output signal.

Synchronising

The sinus generator is synchronised with the master clock of the A/D converter to
allow the signal acquisition always at the extreme values (minimum and
maximum) of the sinus signal.

9.3.2 Power buffer

The board is fitted with a power buffer which feeds in the connected sensors.
Its high performance allows supplying each of the 2 exciting lines (OSC+ and
OSC-) with a maximum value of 260 mA.
The power buffer is also fitted with analogue filters to avoid the internal
perturbances (PC noise). Therefore the quality of the outputted signal is increased
and its distortion is set to the lowest level.
In case of short circuit the internal fuses of the power buffer switch the outputs off.
Functions of the board
and 3,5 V .
rms rms
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