Operating Manual EMGZ611A...614A
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4.3 Electronic Units EMGZ611A...614A
Common
The electronic unit is mounted to a robust aluminium housing. It contains a
microprocessor to handle all calculations and communications, the highly
accurate sensor power supply and the signal amplifiers for the measuring values
of up to four measuring points. The electronic unit has no trimmers and only few
Dip-switch, jumpers to keep most accurate long-time and temperature stability.
Operation
The large backlit display with 2x16 characters, 4 LED’s and large keys guarantee
simple operation. All information is in plain text with the following languages
selectable: English, German, French and Italian. Most of the functions may be
paramterized. The parametrization can be done via the keys or the interfaces. All
inputs are fail-safe stored in an EEPROM.
Strain gauge amplifier
The strain gauge amplifier provides the highly accurate power supply (5VDC, or
10VDC) for 1 or 2 force sensors per channel. The force sensors can be wired using
4 wire circuit or 6 wire circuit. This allows accurate control of the bridge excitation
even with very long cabling.
The power supply is equipped with current control. This allows to detect short
circuit or cable break automatically and to output an error message if required.
A highly accurate, fixed difference amplifier rises the mV signal up to 10V. This
signal will be fed to the A/D converter. The microprocessor then does all
application specific calculations with the digitized measuring value (such as offset,
gain, lowpass filter, limit switches, etc). The resulting feedback value is provided
as both tension and current signal at the same time.
Using digital inputs, the amplifier can be switched easily between 2 different gain
values (for ex. to process different operating conditions). There is no
reconfiguration required to switch the gain values.
The strain gauge amplifier section written above is integrated separately for each
channel to provide independent evaluation of each measuring point.
Type Number of
channels
Sensors per
channel
Feedback signals
EMGZ611A 1 1 or 2 Sum A+B
EMGZ612A 2 1 or 2 Sum A+B
EMGZ613A 3 1 or 2 Sum A+B
EMGZ614A 4 1 or 2 Sum A+B
