Brüel & Kjaer Vibro ds822 Serie Manuel page 68

4 mm displacement sensor system series ds822 ATEX
EN
Instructions
9.4 Transfer characteristics
The characteristic curves shown in the measurement report are created under the stated envi-
ronmental conditions and with the stated target material. When you order a complete displace-
ment sensor system, you will receive an individual measurement report which may deviate from
the illustrated typical transfer function.
9.4.1 Characteristic curve for distance measurement [GAP / V]
The transfer characteristic describes the interdependence of signal voltage and the distance
between sensor tip and the object to be measured.
Y-axis: GAP [V]
9.4.2 Characteristic curve for vibration measurement [ISF / mV/μm]
The displacement sensor system has a sensitivity of 4 mV/μm (101,5 mV/mil) with reference to
B&K Vibro reference material 42CrMo4 (Material-No. 1.7225) according to DIN 17 200, corre-
sponding to AISI/SAE 4140. The ISF (Incremental Scale Factor) describes the accuracy of the
sensitivity (ISF error / %) in dependence on the separation.
Y-axis:
[mm]
9.4.3 Deviation from best fit straight line [DSL / μm]
DSL (DSL/μm = Deviation from best fit Straight Line) describes the deviation from an ideal char-
acteristic curve of the distance measurement.
Y-axis:
[mm]
The measurement report can be found in view "Measurement set-up" on page 18.
Page 32 of 33
X-axis:
ISF [mV / μm]
DSL error [μm]
Displacement [mm]
X-axis:
X-axis:
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Displacement
Displacement
C105070.001 / V04
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