Description - Measurement Computing 101 Operating Manual

Description

The Model 101 is a new, microprocessor-controlled, 3-Channel DC Signal Conditioner Amplifier designed to be
used with bridge type or differential output accelerometers and pressure transducers. The Model 101
incorporates variable gain adjustment, shunt calibration capability, and multiple excitation level settings. For
various applications where specific frequency roll-off is required, the Model 101 offers a variety of optional filter
modules. Measurement Specialties new 3-Channel DC Signal Conditioner offers a multitude of features in a
simple bench top enclosure for ease of use.
The Model 101 utilizes a microprocessor SLEEP mode to eliminate high frequency clock noise and their
associated harmonics. The microprocessor WAKES momentarily to acknowledge front panel switch depressions
then goes to SLEEP immediately after processing and executing the requested function. This allows the
amplifiers to operate with minimum self generated noise and provides clean, clock free amplified signals.
The Model 101 uses dual 12-bit DAC's, for each channel, to autozero the input and output amplifiers for DC
input signals. Input signals with magnitudes of +/-10 Vdc can be zeroed. Unzeroing the amplifier zeroes both
autozero DAC's. A unique output DAC trimming routine, allows trimming the output zero to within +/-1mVdc.
Dual 12-bit DAC's, for each channel, are also used to set amplifier gains from 0.00 to 999.9 with +/-0.5%
precision. Amplifier gains can be changed "on the fly" without damage to the instrument.
Each of the 3 amplifiers has a 150kHz full power and a 200kHz small signal bandwidth and can drive 10mA into
a 1K ohm load. A low pass filter socket is provided, for each amplifier, to filter broadband noise. A variety of
optional filter modules can be installed in these sockets.
The transducer excitation supplies are individually adjustable for each channel from 0.00 to 12.00Vdc. Any
setting above 12.00Vdc will generate an excitation voltage of 12.10Vdc. The outputs are short circuit protected
and can supply up to 30mA each. Remote sense leads are provided to eliminate errors caused by long cable
lengths.
The Model 101 has been CE tested for compliance to EN61326 for EMC emissions and immunity and
EN61010-1:2001 for Product Safety.
Consult Measurement Specialties Application Engineers for associated optional filter modules and cable
assemblies to mate with the Model 101.
Operating Manual Model 101, Revision 1 Page 5 of 14