3
1.
INTRODUCTION
The S7TW is a two-wire, 4-20mA-output oscillator/demodulator for use with LVDT
transducers having suitable primary impedance. (Refer to sect 5).
Coarse and Fine controls for gain and zero (4mA) allow use with the full range of RDP
transducers and a filter switch allows selection of optimum bandwidth/noise. The
differential signal amplifier circuit allows the use of long transducer cables.
The two-wire supply/output system allows use with long cables from the supply/monitor
with a wide range of supply voltage and high noise immunity.
In order to meet the primary impedance requirements of the S7TW, some RDP
transducers are modified to TM202. Section 2.4 refers.
Note:
The S7TW is not suitable for use with differential or half-bridge transducers.
