The
Beran 475 Laboratory
TransCal™ is a dedicated, high precision instrument
for the fully automatic calibration of vibration transducers.
The sine correlation measurement technique is used in
the Beran 475 to ensure that accurate, repeatable measurements
are provided over a wide frequency range and with changing
measurement environments.
The 475 system firmware is embedded in the instrument
in ROM, with individual transducer and test configurations
stored on floppy disk. Additionally, a calibration configuration
can be stored in memory for immediate recall at power
on. Transducers measuring acceleration, velocity or
displacement may be calibrated using the 475.
Sensors providing a charge, voltage or ICP type signal
may be interfaced via the optional Beran 801A
Precision Amplifier. Piezoresistive devices will
require the 801B
DC Conditioning Amplifier.
The 475 automatically controls both the 801A
and 801B. Using a digital integration / differentiation
technique, conversion between acceleration, velocity
and displacement may be achieved with negligible error. |
|
Four
types of automatic tests may be carried out on vibration
transducers using
the Beran 475 Laboratory TransCal™. Three of these
are
dynamic tests with the test transducer mounted on the
shaker together with the reference transducer; the
fourth is a DC test for
piezoresistive transducers.
Transducer calibration results are displayed graphically
at each test point as each profile
is running. On completion of a
profile, or sequence of profiles, the results may be viewed
in
either text or graphical
formats. Serial and parallel outputs are also available
so
that results can be hardcopied,
plotted or exported to a variety
of spreadsheets, calibration
databases or word processor
programs.
The Beran 475 Laboratory
TransCal™ is fully
compatible with the Beran
485
Application Software.
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MEASUREMENT UNCERTAINTIES
(complete system) |
| Integration |
|
| >200ms
or 20 cycles |
| Input |
|
| >10% FSD |
|
| |
Amplitude |
Phase |
Up to 1kHz
1 to 5kHz
5 to 20kHz
20 to 50kHz
>50kHz |
<0.2%
<0.3%
<0.5%
<0.7%
<1%
|
<0.25°
<0.5°
>1°
<3°
<5° |
at
an ambient temperature
of 20°± 10°C |
|
| |
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