LDM-1000 – LVDT/RVDT Signal Conditioning Module
LDM-1000 Rev. 7 www.meas-spec.com 2015-July
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• 10 to 30VDC operation
• Standard DIN rail form factor
• 4 to 20mA and VDC outp u ts
• Zero, span and phase adjustabl e
• 2.5, 5 and 10kHz excitation frequencies
• Low noise, 3-pole Butterworth filter
• Master/slave capability
• Compatible with 4, 5 & 6-wire LVDTs/RVDTs
• Works with very low input impedan ce LVDTs
and RVDTs
DESCRIPTION
The LDM-1000 is an extremely versatile and popular LVDT/RVDT signal conditioning module and the perfect
choice for industrial applications requiring the DIN standard rail mount. T he LDM-1000 provides ever ything you
will need for accurately interfacing an AC operated Linear or Rotary Variable Differential Transformer to your
industrial position control system.
The LDM-1000 was designed with maximum sensor/system compatibility in mind. A wide range of gains,
excitation voltages and frequencies ensure compatibility with virtually all LVDT and RVDT type transducers. A
full-wave synchronous demodulator eliminates quadrature and harmonics to maximize external noise rejection.
The LDM-1000 also provid es s ever al dif f er ent i np ut/o utput op tio ns to ac c om modate var ying PLC and analo g I/O
requirements:
Single-ended voltage outputs with the use of 100% zero suppression to maximize the sensor stroke
utilization while simplifying programming (no need to deal with sign)
Bipolar v oltage output to maximize A/D bit usage with most PLC a nalog input m odules, for app lications
requiring high resolution
4-20mA current output for applications requiring long signal runs or where noise immunity may be an
issue. The 4-20mA loop is dr iven b y an interna l power supply, provided b y the LDM-1000.
Finally, the frequency response is internally selectable and so is the master/slave function which allows
synchron i zation of multip le LDM-1000 modules to prevent beat frequencies and cross talk between transducers.
Also see our other LVDT/RVDT signal conditioner models:
LVM-110 ±15VDC supply, ±10 and 0 to 10VDC outputs, open circuit board
LiM-420 24VDC supply, 4-20mA (3-wire) output, open circuit board
ATA-2001 Line powered, DC voltage and current outputs, push-button programmable
IEM-422 Line powered, 4-20mA output, NEMA-13 rated enclosure
PML-1000 AC or DC supply, DC voltage, current and RS485 outputs, 1/8th DIN panel meter,
MP-2000 Line-powered, analog DC & RS232 outputs, ¼ DIN, dual channel set point controller with bit-
mapped display
Measurement Specialties, Inc. (NASDAQ MEAS) offers many types of sensors and signal conditioners. Data
sheets can be downloaded from our web site at: http://www.meas-spec.com/datasheets.aspx
Measurement Specialties a c quired Sc ha ev itz Sens ors and the SchaevitzTM trademark in 2000.