HBM BN100A, Руководство по эксплуатации, Страница: 12 / 40

Introduction
BN100A
A0643-6.1 HBM: public
9
2.2 General
The BN100A bridge calibration unit is a highly precise
calibrator to calibrate measuring equipment and meas­
urement chains which function with a carrier frequency of
225Hz. In the first instance the BN100A is intended for
the calibration of the DMP40/DMP41 digital precision in­
struments. The BN100A bridge calibration unit is inserted
in the measuring system to be calibrated in place of the
transducer (full bridge), or is connected directly with the
measuring instrument, and simulates with the aid of
switchable inductive dividers the output signals of the
transducer in a range of
"
100mV/V. The unique preci­
sion of the simulation of the transducer signals is effected
by a control circuit which additionally reduces the low er­
ror of the inductive divider stages of a large degree. The
full accuracy of the BN100A only comes into effect when
it is connected in the six‐wire‐circuit. The calibration error
will then be max. 5ppm with a signal of 2mV/V.
Fig. 2.1 Block circuit diagram