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9
Sensitivity format
Explanation
To convert to F.S. output
mV/V/mm
e.g. 46mV/V/mm
Millivolts of output, per
volt of excitation, per
mm of travel
Sensitivity x 0.5 x range in mm
e.g. 0.046 x 0.5 x 50 = 1.15V
V/V at full-scale,
e.g. 2.3 V//V
Volt of output, per volt of
excitation, at full-scale
Sensitivity x 0.5
e.g. 2.3 x 0.5 = 1.15V
mV/mm at a specified
excitation voltage.
E.g. 230mV/mm at 5V exc.
Millivolts of output, per
mm of travel, given a
specified excitation
voltage.
(Sensitivity / specified
excitation voltage) x 0.5 x
range in mm
e.g. (0.230/5) x 0.5 x 50=1.15V
The standard excitation of the S7TW is 0.5V for mod 6 onward, as used in the
calculations above.
The following table shows the band of transducer full-scale output voltages
appropriate to each of the 8 Gain Range Settings. For example, a transducer with a
full-scale output of 1.15V would be correctly set as gain range 2.
The table below shows the V r.m.s. signals required for full
output with the Fine Span either at minimum or maximum:
Lever On
2 to 4
1
1
– 2
2
0.7
– 1
3
0.4
– 0.7
None
0.25
– 0.44
4
0.15
– 0.25
5
0.1
– 0.15
6
0.05
– 1
7
0.03
– 0.05
8
3.5
Fine Span Potentiometer
This control interpolates between the ranges of the Span switch. (Section 3.4).
Avoid applying excessive tightening force to the locking nut.
3.6
Filter Switch
Toggle/lever 8 of the "zero" DIL switch is used to select the bandwidth/noise
performance as shown in the specification: