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LVDT
Interface Model LVDT-8
FEATURES
- Excitation
and signal conditioning for up to eight independent
LVDT transducers
- DC
outputs multiplexed to a host-mounted A/D converter
- 5
KHz excitation frequency (1-10 KHz optional)
- Individual
offset, gain and phase adjustments
- Up
to 64 LVDT's per A/D converter
FUNCTIONAL
DESCRIPTION
The
LVDT-8 is mounted externally to the host computer in a metal
enclosure that measures 8" x 4.75" x 0.75".
Each LVDT-8 provides AC excitation and signal conditioning
to eight independent LVDT transducers connected to the card
via terminal blocks. A regulated voltage oscillator supplies
standard 5 KHz excitation (1-10 KHz available) to the primary
windings of the LVDT's. Signals from each LVDT secondary pass
through an RC phase adjustment circuit and are then applied
to a synchronous demodulator and low pass active filter for
conversion to DC voltage. The DC signal then passes through
an amplifier which provides offset and gain adjustment. Gain-selection
jumpers are provided on each channel. All DC outputs are connected
to an 8:1 multiplexer. The multiplexer is controlled by a
3-bit address (A0, Al, A2) from the A/D converter in the host
computer. The output of the multiplexer is buffered and connected
via jumpers OV-0 through OV-7 to one of eight output channels.
Outputs can then be coupled to multiplexed A/D cards such
as Chassis Plans' Model AD12-8. Since one LVDT-8 module requires only
one output channel to serve eight transducers, a total of
64 transducers can be served per eight-input A/D card. If
more channels are needed, then additional A/D card(s) can
be installed in the computer.
SPECIFICATIONS
-
Transducers
Served: LVDT, RVDT, LVRT with primary impedances of
150 Ohms or greater.
-
Excitation:
3.2 Vrms at 5 KHz, all channels synchronized. Optionally,
the frequency may be anywhere in the range of 1 to 10
KHz. Also, frequency selection can be made individually
for each LVDT channel. Actual frequency may be slightly
different.
-
Available
Gains: Each channel has a gain from 1 to 8, selected
by jumpers and adjustment potentiometers. A post amplifier
provides a gain of either 2 or 3 applied to all channels
on a card.
-
Output
Analog Voltage: + 5 VDC.
-
Control
Inputs: Three binary digital inputs for channel selection.
Logic levels compatible with LSTTL logic.
Environmental
- Operating
Temp: 0 to 65oC.
- Storage
Temp: -40 to 100oC.
- Humidity:
0 to 90% RH, non-condensing.
- Size:
8.0 by 4.74 by 0.75 inches, fits inside the included
T-Box enclosure
- Power
Required: +12 VDC: 230 mA; -12 VDC: 230 mA
Regulatory
Compliance 
Declaration of Conformity, and Test Reports are on file. Users
must use appropriate shielded cables.
| Part
Number |
Price(USD)
|
| LVDT-8 |
525.00
|
View / Download Manual (in .PDF
format)
|
