The
Beran 445 Portable
TransCal™ provides a simple-to-use, self-contained,
battery
powered calibrator. It consists of the drive generator,
power amplifier, built-in shaker and reference accelerometer,
all fitted into a rugged carrying case.
The operator sets individual frequencies and amplitudes.
The transducer output is measured and the sensitivity
is calculated and displayed. The results can be output
onto the built-in printer as they are measured or stored
in memory for printing later.
The reference accelerometer, which is an integral part
of the shaker head, is used to measure and set the vibration
amplitude of the shaker. As the input frequency changes,
the signal amplitude can be adjusted to keep the reference
acceleration constant. The unit has an RS 232 port for
data transfer to a PC. The
data is in ASCII format so that it may be readily incorporated
into spreadsheet programs. |
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In
cases where the transducer is bulky and has a significant
weight of its own, an automatic correction for the mass
loading effect can be applied to all measurements.
The 445 Portable TransCal™ is the ideal instrument
for field testing and verifying vibration transducers
in situ. No external power is required and results are
stored for subsequent processing.
Displacement probes can be calibrated in both static and
dynamic modes. Additional optional fixtures are required
for this. For dynamic calibration, the Dl 224 fixture
is required. Static calibration, including linearity checks,
requires the Dl 223 fixture, which includes a dial micrometer
gauge.
A self-test program checks the operation of the unit upon
initial power up.
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Measurement
uncertainties
(complete system) |
| Acceleration |
| 10Hz to 2kHz |
±0.3dB |
| 2kHz to 10kHz |
±0.5dB |
| Velocity |
| 20Hz to 500Hz |
±0.3dB |
| 500Hz to 2kHz |
±0.5dB |
| Displacement |
| 20Hz to 150Hz |
±0.3dB |
| 150Hz to 200Hz |
±0.5dB |
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