AN-536: Dimensional Gaging Measurements with Model
3B17
Data Sheet
•
3B17: Wide Bandwidth LVDT/RVDT Input Data Sheet
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REFERENCE MATERIALS
Informational
•
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Selecting the Right Signal Conditioning Series for Your
Application
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3B17
GENERAL DESCRIPTION
The 3B17 is a wide-bandwidth single-channel signal-
conditioning module which isolates, amplifies, and filters
signals from 4-, 5-, or 6-wire Linear Variable Displacement
Transformers (LVDTs) or Rotary Variable Displacement
Transformers (RVDT). The 3B17 input module provides an AC
excitation voltage of 1V rms to 5V rms at frequencies between 1
kHz and 10 kHz. All gain and zero suppression can be user-
calibrated by screwdriver adjustments through the sliding door
on the top of the module. Gain can vary over an extensive 256:1
range by adjusting a combination of a rotary switch and trim
potentiometer. Zero suppression can vary over +5V from the
center setting. The current output can be independently
adjusted over a +5% range for zero and span. In addition, the
3B17 is mix-and-match and hot-swappable with all 3B Series
modules, so it can be inserted or removed from any socket in
the same backplane without disrupting system power.
3B Series Custom-Ranging Program
– Externally-
programmable Model 3B17-00, and 3B17-D-00, enable the user
to configure a special input range, excitation voltage and
excitation frequency by using the optional plug-on AC1310
ranging card, which houses user-supplied resistors to determine
.
excitation voltage amplitude and frequency. To facilitate
selecting resistors, a Windows program, 3B-CUSTOM,
calculates resistor values based on the user-desired input/output
ranges and AC excitation.
The 3B17 input and AC excitation output terminals are
protected for up to 130V rms, protecting the computer side
from damage due to field-side over-voltage faults. The LVDT
input signal is amplified to give the high level output voltage.
The 3B17 automatically compensates for phase errors between
the primary and secondary of the LVDT or RVDT, eliminating
the need for a phase adjustment and automatically rejects any
residual quadrature voltages via a unique approach to error
compensation which uses the sum of the two secondary
winding to directly drive the demodulator. The amplitude and
frequency of the AC excitation can be factory configured to
meet custom needs (Model 3B17-Custom) or externally
configured (Models 3B17-00 and 3B17-D-00) with the optional
AC1310 plug-on custom ranging card.
.
Figure 2
Rev. 0 | Page 2 of 8
3B17
3B17 Models Available
Model
3B17-00
3B17-01
3B17-02
3B17-03
3B17-04
3B17-Custom
3B17-D-00
3B17-D-01
3B17-D-02
3B17-D-03
3B17-D-04
1
2
Excitation Voltage
Externally Programmable
2
3 V rms
5 V rms
5 V rms
1 V rms
*
Externally Programmable
2
3 V rms
5 V rms
5 V rms
1 V rms
Excitation Frequency
Externally Programmable
2
2.5 kHz
5 kHz
7.5 kHz
10 kHz
*
Externally Programmable
2
2.5 kHz
5 kHz
7.5 kHz
10 kHz
Output Ranges
1
-10 V to +10 V & 0 mA to 20 mA
-10 V to +10 V & 0 mA to 20 mA
-10 V to +10 V & 0 mA to 20 mA
-10 V to +10 V & 0 mA to 20 mA
-10.0 V to +10 V & 0 mA to 20 mA
*
-10 V to +10 V & 0 mA to 20 mA
-10 V to +10 V & 0 mA to 20 mA
-10 V to +10 V & 0 mA to 20 mA
-10 V to +10 V & 0 mA to 20 mA
-10 V to +10 V & 0 mA to 20 mA
Output current range may be user programmed to 4 mA to 20 mA using jumper supplied.
Requires AC1310 ranging card.
* Custom Input/Output ranges are available. Refer to configuration guide.
3B17 Specifications
(typical @ +25°C and ±15 V dc, and +24 V dc Power)
Description
Input Range
Types
Standard Range
Custom Excitation
4-, 5-, 6-wire LVDT or RVDT, including differential coils
20 mV rms to 5 V rms; See Model Table for Excitation
Voltage and Frequency
V
exc
= 1 V rms to 5 V rms
V
exc
freq. = 1 kHz to 10 kHz
Output Range
Voltage (R
L
> 2 KΩ)
Current (R
L
= 0 to 850Ω)
1
With Input Overload
-10 V to +10 V
4 mA to 20 mA or 0 mA to 20 mA
40 mA, maximum
Accuracy
2
Initial @ +25°C
Nonlinearity
2
±0.1% Span
±0.05% Span
Stability vs. Temperature
Voltage Output
Zero
Span
Current Output
3
Zero
Span
±25 ppm of Span/°C
±25 ppm of Reading/°C
LVDT Excitation
4
±0.005% of Span/°C
±0.01% of Span/°C
Model 3B17
Rev. 0 | Page 3 of 8
3B17
Voltage
Voltage, tolerance
Frequency
Drive
Harmonic Distortion
1 V rms to 5 V rms
±10%
1 kHz to 10 kHz, ±15%
20 mA rms, minimum
< 0.5%
Voltage Output Calibration
4
Span Adjustment Range
Zero Adjustment Range
256:1
±5 V
Current Output Calibration
4
Zero and Span Adjustment Range
Input Bias Current
Input Resistance
Bandwidth
5
, -3 dB
Output Rise Time, 10% to 90% Span
±5% of Span
+1 µA
100 MΩ
100 Hz
5 ms
Input Protection, Signal and Excitation Voltage
Continuous
Transient
Voltage Output Protection
Current Output Protection
±15 V dc Supplies
Rated Operation
Current
Sensitivity
+24 V dc Loop Supply
Rated Operation
Current
Sensitivity
Mechanical Dimensions
+13.5 V dc to +30 V dc
+27 mA @ l
out
= 20 mA
±0.001% span/V
3.15" x 3.395" x 0.775"
80.0 mm x 86.2 mm x 19.7 mm)
Environmental
Temperature Range
Rated Performance
Storage
Relative Humidity, 24 hours
RFI Susceptibility
1
2
130 V rms maximum
ANSI/IEEE C37.90.1-1989
Continuous Short to Ground
130 V rms, continuous
±(13 V dc to 18 V dc)
±65 mA plus LVDT Current
7
±0.03% span/V
-25°C to +85°C
-55°C to +85°C
0 to 95% @ +60°C non-condensing
±0.5% Span error @ 400 MHz, 5 Watt, 3 ft
For a 0 mA to 20 mA range, a typical minimum output current is 10 µA.
Includes the combined effects of repeatability, hysteresis, and nonlinearity.
3
With respect to the voltage output.
4
A wide range of custom zero suppression and span is available with the 3B17-00 model, using the AC1310 ranging card.
5
Bandwidth can be set for up to 1/10 the excitation frequency when ordering Model 3B17-custom.
6
+24 V dc loop power is required for driving the current output at loads up to 850
Ω
. If a current output load of 400
Ω
or less is applied, +15 V dc is sufficient for loop power. If only
voltage output is used, loop power is not required.
7
Typical supply current is ±40 mA per module plus ±5 mA for the LVDT drive current. To calculate supply current requirements from LVDT currents, use 75% of the LVDT rms
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