Precision 28000 Solutions for Measuring Bridge, Strain, Temperature, Vibration and More
Precision Filters, Inc. (PFI) offers a complete line of signal conditioners to measure static and dynamic strain (including high temperature strain), RTDs, thermocouples, IEPE sensors or any bridge-type transducer including pressure sensors, piezo-resistive accelerometers, load cells and more. We offer models with an analog bandwidth greater than 1 MHz and programmable filter selections between 1 Hz and 200 kHz. Choose from our line-up of four or eight channel cards with performance to match your requirements.
All of PFI’s Bridge signal conditioners have built-in test hardware that makes automated system verification and validation easy. The test bus enables automated calibration signal insertion at the amplifier input. Any output channel may be observed without disrupting the normal output using the monitor bus. Our four channel cards have real time monitoring of excitation, transducer loop resistance, sensor leakage to ground and more. Never before has a system provided you with so much pre-test confidence that your system is functioning properly.
Measurements
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Spec Sheets and Technical Docs
Octal Bridge Conditioner w/ Constant Voltage Excitation; 100 KHz Bandwidth
Quad-Channel Transducer Conditioner with Voltage and Current Excitation
Octal-Channel Bridge Conditioner with Constant Voltage Excitation
Quad-Channel Transducer Conditioner with Voltage and Current Excitation and 0.01% DC Accuracy
Quad-Channel Transducer Conditioner with Voltage and Current Excitation
Quad-Channel Wideband Transducer Conditioner with Voltage and BCCTM Current Excitation and REZCOMP®
Quad-Channel 350 Vcm Transducer Conditioner with Voltage and Current Excitation
Quad-Channel 500 Vcm Galvanically Isolated Transducer Conditioner with Voltage and Current Excitation
Eight-Channel Conditioner with Balanced Constant CurrentTM Excitation
Innovative Performance Technologies
Sensor Health Monitoring
At Precision Filters, we know that even the best signal conditioner is of little value if the sensor or input wiring is faulty. A failed sensor or cable discovered after the test is too late...
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At Precision Filters, we know that even the best signal conditioner is of little value if the sensor or input wiring is faulty. A failed sensor or cable discovered after the test is too late and will result in lost data that can never be recovered. Quick and easy visibility of cable and sensor health allows timely corrective actions to save crucial data. Test hardware and software in our bridge conditioner products automate sensor and cable health checks. Transducer excitation, resistance and even leakage to ground are reported in real time.
Balanced Constant Current
Precision Filters’ proprietary Balanced Constant Current (BCC™) excitation is optimized for making dynamic and static strain measurements on single active strain gages and RTD’s..
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Precision Filters’ proprietary Balanced Constant Current (BCC™) excitation is optimized for making dynamic and static strain measurements on single active strain gages and RTD’s. Use 2-wire BCC to make accurate dynamic measurements on a single active strain gage or 4-wire BCC for static and dynamic strain or RTD measurements.
BCC excitation provides a true balanced input for rejection of common-mode signals. Electrostatic pickup is reduced when compared to single-ended constant current excitation or a quarter-bridge configuration with remote completion resistors or unbalanced current sources. The balanced current excitation circuit operates properly even under certain common gage fault conditions such as a direct short of the gage to the test model.
Measuring Resonant Transducers
Some transducers such as piezo-resistive pressure transducers can have very high resonant frequencies that can be excited by transient events and this...
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Some transducers such as piezo-resistive pressure transducers can have very high resonant frequencies that can be excited by transient events and this out-band signal can be larger than the signal of interest.
The 28000 amplifier gain is distributed as “pre-filter” and “post-filter” gain to allow the filter to remove out-band signals such as transducer resonance while still achieving the required full-scale in-band signal level. Using the 28000 “reserve” feature, the user can specify the required protection against out-band noise and the pre- and post-filter gain are automatically distributed to provide this protection. The pre-filter gain is set to achieve the required amplifier headroom for the out-band signals prior to the filter while maximizing dynamic range. After the filter removes the out-band signals, the post-filter gain is set to achieve the desired full-scale output. The 28144 card may be equipped with either a low-pass filter or a high-pass filter cascaded with a low-pass filter to form a band-pass filter. The band-pass configuration and the distributed amplifier gain provide the user ultimate flexibility to eliminate sources of either high frequency or low frequency noise.
Frequency or Time Domain Measurements
The Precision Filters’ FLAT/PULSE filter technology allows the user to set the frequency response characteristics of the signal conditioner under program control...
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The Precision Filters’ FLAT/PULSE filter technology allows the user to set the frequency response characteristics of the signal conditioner under program control. For transient tests or tests where time-domain wave shape preservation is important, program the filter characteristic to PULSE mode. The PULSE mode provides linear phase response, which is required for time-domain wave shape reproduction and outstanding transient response with low overshoot and ringing. For frequency domain analysis, selecting the FLAT filter characteristic will result in outstanding transfer function flatness and a sharp, selective filter response. FLAT/PULSE filter technology is available on all Precision Filters’ strain and bridge conditioners.
Components and Features
- Dual Mode Constant Voltage & BCC Excitation
- Bridge Conditioners with Voltage Excitation
- Dynamic Strain with Current Excitation
Dual Mode Constant Voltage & BCC Excitation
Precision’s line-up of quad-channel conditioners provides the versatility to condition a wide variety of constant-voltage excited sensors including full bridges and sensors that require precise bridge completion. Use BCC excitation technology for 2- or 4-wire strain gage or RTD measurements. Choose the full-featured high performance 28144 card, the 28124 card for multiple filtered/wideband outputs, the 28154 for 350 Vcm capability or the economical 28114.
Dual Mode Constant Voltage & BCC Excitation Conditioners Common Features:
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28144 4-Channel Wideband Transducer Conditioner
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28154 4-Channel 350 Vcm Wideband Transducer Conditioner
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28124 4-Channel Wideband Transducer Conditioner
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28164 4-Channel 500 Vcm Galvanically Isolated Transducer Conditioner
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28114 4-Channel Transducer Conditioner
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Bridge Conditioners with Voltage Excitation
Where applications call for high performance bridge conditioning with high channel counts, the 28108 and 28118 octal filter/amplifiers with constant voltage excitation deliver low-noise and DC stability for either AC or DC bridge-based sensors or low-level voltage measurements.
Bridge Conditioners with Voltage Excitation Common Features:
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28108 4-Channel Bridge Conditioner
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28118 4-Channel Bridge Conditioner
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Dynamic Strain with Current Excitation
Measurements of dynamic strain with PFI’s balanced constant current technology are much less susceptible to the noise pickup and lead resistance desensitization that plague single-ended constant current topologies.
28458 Dynamic Strain Conditioners Features:
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Bridge and Strain Conditioner Card Selection Guide
For PDF version, click here
| Card | 28144 | 28114 | 28124 | 28124-EA | 28154 | 28164 | 28108 | 28118 | 28458 |
| Type | AC/DC Voltage with Const. Voltage and Current Excitation | AC/DC Voltage with Const. Voltage and Current Excitation | AC/DC Voltage with Const. Voltage and Current Excitation | Enhanced Accuracy AC/DC Voltage with Const. Voltage and Current Excitation | High Common Mode AC/DC Voltage with Const. Voltage and Current Excitation | High Common Mode AC/DC Voltage with Const. Voltage and Current Excitation | AC/DC Voltage with Const. Voltage Excitation | AC/DC Voltage with Const. Voltage Excitation | AC/DC Voltage with Const. Voltage Excitation |
| Common Mode Voltage Range | 10 V | 10 V | 10 V | 10 V | 350 V | 500 V | 10 V | 10 V | 10 V |
| Channels/ Card | 4 | 4 | 4 | 4 | 4 | 4 | 8 | 8 | 8 |
| Applicable Transducer | Static or dynamic strain w/ BCC™, pressure, RTD, load, accel., AC/DC filter/amp, any bridge-type sensor | Static or dynamic strain w/ BCC™, pressure, RTD, load, accel., AC/DC filter/amp, any bridge-type sensor | Static or dynamic strain w/ BCC™, pressure, RTD, load, accel., AC/DC filter/amp, any bridge-type sensor | Static or dynamic strain w/ BCC™, pressure, RTD, load, accel., AC/DC filter/amp, any bridge-type sensor | Static or dynamic strain w/ BCC™, pressure, RTD, load, accel., AC/DC filter/amp, any bridge-type sensor | Static or dynamic strain w/ BCC™, pressure, RTD, load, accel., AC/DC filter/amp, any bridge-type sensor | Strain, pressure, RTD, load, accel., AC/DC filter/amp, any full bridge-type sensor | Strain, pressure, RTD, load, accel., AC/DC filter/amp, any full bridge-type sensor | Dynamic strain, w/ BCC™, AC filter/amp |
| Interface |
2-10 Wire Constant Voltage w/ Programmable Bridge Completion, Shunt Calibration 2/4 Wire Constant Current |
2-10 Wire Constant Voltage w/ Programmable Bridge Completion, Shunt Calibration 2/4 Wire Constant Current |
2-10 Wire Constant Voltage w/ Programmable Bridge Completion, Shunt Calibration 2/4 Wire Constant |
2-10 Wire Constant Voltage w/ Programmable Bridge Completion, Shunt Calibration 2/4 Wire Constant |
2-10 Wire Constant Voltage w/ Programmable Bridge Completion, Shunt Calibration 2/4 Wire Constant |
2-10 Wire Constant Voltage w/ Programmable Bridge Completion, Shunt Calibration 2/4 Wire Constant |
2 to 6 wire w/ Shield | 2 to 6 wire w/ Shield | 2 wire w/ Shield |
| Excitation | Constant Voltage: 0 to 20.475 V;
BCC: 0 to 20.475 mA |
Constant Voltage: 0 to 20.475 V;
BCC: 0 to 20.475 mA |
Constant Voltage: 0 to 20.475 V;
BCC: 0 to 20.475 mA |
Constant Voltage: 0 to 20.475 V;
BCC: 0 to 20.475 mA |
Constant Voltage: 0 to 20.475 V
BCC: 0 to 20.475 mA |
Constant Voltage: 0 to 20.475 V
BCC: 0 to 20.475 mA |
Constant Voltage: 0 to 20.475 V | Constant Voltage: 0 to 20.475 V | BCC: 0,5,10,15,20 mA |
| Bandwidth | >1.5 MHz (Opt. W) |
190 kHz | 250 kHz | 250 kHz | 250 kHz | 25 kHz | 100 kHz | 190 kHz | 190 kHz |
| Gain | x1/16 to x8192 w/ 0.05% Resolution | x1/16 to x1024 w/ 0.05% Resolution | x1/16 to x8192 w/ 0.0125% Resolution | x1/16 to x8192 w/ 0.003% Resolution | x1/16 to x8192 w/ 0.025% Resolution | x1/16 to x8192 w/ 0.025% Resolution | x1/16 to x8192 w/ 0.05% Resolution | x1/16 to x1024 w/ 0.05% Resolution | x1/16 to x1024 w/ 0.05% Resolution |
| Filter | 4-Pole Flat/Pulse Low-Pass w/ optional REZCOMP, 8-Pole Low-Pass or 8-Pole Band-Pass | 4-pole Flat/Pulse Low-Pass |
4-pole Flat/Pulse Low-Pass |
8-pole Flat/Pulse Low-Pass |
4-pole Flat/Pulse Low-Pass |
4-pole Flat/Pulse Low-Pass |
4-Pole Flat/Pulse Low-Pass |
4-Pole Flat/Pulse Low-Pass |
4-Pole Flat/Pulse Low-Pass |
| Cutoff Frequencies | Flat: 2 Hz to 204.6 kHz
Pulse: |
FX02: 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz
FX03: |
Flat: 2 Hz to 100 kHz
Pulse: |
Flat: 2 Hz to 51 kHz
Pulse: |
2 Hz to 100 kHz | 2 Hz to 10 kHz | Flat: 100 Hz to 25.5 kHz
Pulse: |
FX02: 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz
FX03: |
FX02: 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz
FX03: |
| Outputs | Single-ended (SE) with Ground Sense | Single-ended (SE) with Ground Sense | (3) Buffered Prog. WB/Filtered SE Outputs per channel w/ Ground Sense | (3) Buffered Prog. WB/Filtered SE Outputs per channel w/ Ground Sense |
(3) Buffered Prog WB/Filtered SE Outputs Optional isolated output |
(3) Buffered Prog WB/Filtered SE Outputs Optional isolated output |
Single-ended (SE) or Differential Output (Option T) | Single-ended (SE) or Differential Output (Option T) | (2) Buffered SE Outputs per Channel |
Verification at Test Time
Continual setup, tear down and reconfiguring of sensitive test equipment demands a rigorous protocol to prove that every channel is operating correctly at test time. The 28000 System provides a layer of built-in verification and validation capability to confirm proper operation of the measurement system including sensor and cable. Upon completion of the verification testing, a status report is provided as a defendable means to document system validity at the time of the actual test.
Yearly Calibration
All test systems require periodic calibration. The Precision 28000’s automated built-in test capabilities allow the user to perform convenient, affordable NIST traceable yearly calibration tests on-site without removing the system from the equipment rack. This eliminates the need for expensive off-site calibrations and system downtime.