ASTECH TX31D/1/IFM, Руководство по эксплуатации

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TM Page 16
4 DEMODULATOR RE3D
The RE3D Demodulator is a highly sophisticated unit that can output digital and analogue data collected from a variety of
transmitter types. The built in microcontrollers allow onboard computation of strain and power directly from mechanical
parameters entered into the unit from the front panel or using a PC/laptop via a USB interface. For compatible transmitters,
eg TX34D/TX35D, the RE3D can also be used to set the gain, offset and calibration.
Circuitry and hardware comprising of a 10.7MHz demodulator, pcm decoder and analogue output conditioning circuitry –
digital zero and output level trimmers, signal status indicators etc., are contained within a compact extruded aluminium
enclosure type RE. An inductive power supply oscillator, which replaces batteries as the transmitter power source, is also
incorporated. This can be disabled allowing battery powered transmitters to be used. The power supply is highly flexible
allowing the unit to be powered by either a 9-30VDC source at 1A or a 90-260VAC mains voltage.
In operation the unit circuitry firstly amplifies the low-level 10.7MHz fm signal (received at the inductive head or loop), then
demodulates it to recover the transmitted serial pcm. This is then scaled digitally before being output to the analogue
voltage stage. Output conditioning circuitry provides filtering, zero adjustment and output level adjustment. Maximum
output levels are
±
10V. A tachometer input allows shaft RPM to be displayed. Valid data reception is indicated by the
presence of a front panel red ‘Error’ LED. Depending on the transmitter type various signals can be output. For example,
using a TX34D or TX35D allows the display and output of strain, power, transmitter power supply voltage and transmitter
temperature.
4.1 RE3D FRONT AND REAR PANELS
Red LED - On
when good data is
not being received
Press to
select setting
to change.
Turn to alter
and the press
to keep
changes
Analogue Outputs. Any data type can be output
on any channel. For example torque,
Transmitter supply volts, RPM and Power. Each
output selectable
±
0V TO
±
10V or unipolar for
connection for various data loggers.
Turn to alter the
displayed data.
Press to enter
menu selection.
Press and hold
for two seconds
to return to return
to display mode.
Transmitter power supply
voltage and ambient
temperature
Strain data from
transmitter.
Analogue
output type.