Ectron 451, Instruction Manual

Page: 41 / 74

be approximately 2.6 s assuming a step function signal at the input. Response time will
increase linearly as the frequency setting is increased.
UPDATE RATE
The update rate of the microcontroller and A-to-D converter is 2 kHz, so their influence on
the response of the conditioner is minimal.
OUTPUT POLARITY
The polarity of the output signal can be reversed by changing the polarity of the gain
setting. This avoids the need to reverse the leads of the transducer to accomplish this reversal.
To get exactly the same operation, be sure to change only the polarity and not the numerical
gain setting. Direct gain control is only available when using the gain mode.
NULL IMPROVEMENT
Some LVDT or RVDT transducers have a null signal that is not well defined. As a result,
linearity in the null area can be poor. To some extent, the null area can be degraded further
by adding cabling with high capacitance.
Some improvement in the null area can be made by shunting the transducer’s secondary
windings with resistance. If the application requires better sensitivity and linearity in the
null area, this method should be attempted. For further information contact the transducer’s
manufacturer. Also, see “ Cabling to the Transducer” on Page 4-1.
Model 451 Applications
4-7