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7024 Strain Gage Signal Conditioner
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)
- 28 V 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)
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 |
Description
The 7024 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 7024 Includes:
Power Supply: The 7024 operates directly from
28 V Aircraft Power (MIL-STD-704). The unit handles the sags and surges
common on the 28 V bus including induced effects of lightning (RTCA/DO-160D).
Transducer Flexibility: The 7024 supports full bridge sensors with
resistances from 120 ohms to 20,000 ohms. These choices allow the 7024 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 7024 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 7024 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 7024 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 7024 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 multidrop
capability.
Calibration: The 7024 contains a built-in shunt calibration function.
The shunt calibration resistor of 87.3 K 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.
Appications
- 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 |
|
0.1 |
|
% FSO |
| Linearity |
|
0.1 |
|
% 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 |
Environmental Requirements:
Vs = 28 Vdc unless otherwise specified
| Parameter |
Min. |
Typ. |
Max. |
Units |
| Operating Temperature |
-54 |
|
71 |
º C |
| Storage Temperature |
-54 |
|
85 |
º C |
| Humidity |
|
|
100 |
% |
| Altitude |
|
|
35,000 |
feet |
| Atmosphere |
Explosive Atmosphere as per MIL-STD-810,
Method 511.4 |
Physical Specification:
| Parameter |
Specification |
| Enclosure Type |
Environmentally and EMI
Sealed Aluminum Enclosure, Iridite Finish |
| Enclosure Size |
5.00" x 2.00" footprint,
1.85" height |
| Weight |
10.4 oz (0.65 lb.) |
| Terminals |
D38999/20FA35SA, Load Cell
D38999/20FA35PN, Power, Shunt Calibration and Output Signal |
Datasheet in PDF
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