Feature Highlights
- Strain Gage Signal Conditioning
- Includes Power Supply, Excitation, Amplifier, Filter and Shunt Calibration
- Typical Accuracy of 0.1%
- Current Loop Output (4-20mA)
- 28V Aircraft Power (MIL-STD-704)
- MTBF 90,000 hours (MIL-HDBK-217)
- Tested to MIL-STD-810F and RTCA/DO-160D
Sensors Supported
- Load Cells
- Torque Transducers
- Pressure Transducers
- Strain Gages (with external completion)
- Accelerometers (Piezoresistive)
Description
The 9DINS/MIL signal conditioner provides everything needed to operate a
wide variety of strain gage transducers and to deliver optimal signal output
in MIL-SPEC environments. The 9DINS/MIL Includes:
Power Supply: The 9DINS-MIL operates directly from 28V Aircraft Power
(MIL-STD-704). The unit handles the sags and surges common on the 28V bus
including induced effects of lightning (RTCA/DO-160D)
Transducer Flexibility: The 9DINS/MIL supports full bridge sensors
with resistances from 120 to 20,000 ohms. These choices allow the 9DINS/MIL
to operate Load Cells, Torque Transducers and Pressure Transducers. Quarter
and half bridge strain gages can be operated if they are externally
completed to form full bridges.
Transducer Excitation: The 9DINS/MIL has a fixed excitation that
provides a highly stable excitation voltage for transducer excitation.
Current limiting is provided.
Transducer Amplification: For maximum resolution of measurement data,
the 9DINS/MIL amplifies strain gage signals with a multi-stage differential
amplifier. A fixed gain of 500 is developed internally and fed into a 4-20mA
converter. The amplification properly maps 0-20mV transducers into 4-20mA
output signals.
Transducer Filtering: The 9DINS/MIL filters and conditions strain
gage signals with active low-pass filtering to eliminate unwanted signal
components. Filter is a 400 Hz, 6-pole Bessel style.
Output: The 9DINS/MIL has a current loop (4-20mA) output. The
amplification properly maps 0-20mV transducers into 4-20mA output signals.
Current loops are ideal for long cable runs and provide easy multi-drop
capability.
Calibration: The 9DINS/MIL contains a built-in shunt calibration
function. The shunt calibration resistor of 87.3K ohms generates a half
scale tension output for a 350 ohm load cell. A signal line is available to
engage the shunt calibration relay remotely.
Applications
- Load / Force Monitoring
- Torque Monitoring
- Stress-Strain Analysis
- Pressure Monitoring
- Vibration Monitoring
Electrical
Performance: Vs = 28 Vdc; Tc
= 25º C unless otherwise specified
|
Parameter |
Min. |
Typ. |
Max. |
Units |
| Bridge Resistance |
120 |
|
20,000 |
ohms |
| Excitation Voltage |
|
10.000 |
|
Volts |
| Excitation Current (Short circuit
protected) |
|
28 |
100 |
mA |
| Amplification |
|
500 |
|
Volts/Volt |
| Input Impedance of Amplifier |
|
10 |
|
G ohms |
| CMRR |
|
110 |
|
dB |
| Filter Cutoff Frequency (Six pole Bessel,
120dB/decade) |
|
400 |
|
Hz |
| Filter
Cutoff Frequency Accuracy |
|
5 |
|
% |
| Accuracy |
|
0.01 |
|
% FSO |
| Linearity |
|
0.01 |
|
% FSO |
| Zero Offset Temperature Drift |
|
0.0007 |
0.0015 |
% FSO / º C |
| Span Temperature Drift |
|
0.008 |
0.01 |
% FSO / º C |
| Excitation Temperature Drift |
|
0.002 |
0.003 |
% FSO / º C |
| Current Output (4-20) Load Resistance |
50 |
500 |
525 |
ohms |
| Supply Voltage (Vs) (Reverse polarity
protected, MIL-STD-704 compliant) |
16.5 |
28 |
51.5 |
Volts |
| Operating Current with 350 ohm full
bridge at 10V excitation |
|
75 |
|
mA |
