A Multipurpose Octal Signal Conditioner for the 28000 System
Precision Filters’ 28718 signal conditioner card offers eight channels of universal signal conditioning for RTDs, silicon diodes, 4-20 mA output sensors, or any voltage output device up to 60 V. The balanced differential input, low-noise gain stages, and programmable 4-pole filter remove aliases and maximize dynamic range for an attached A/D converter system. The dual mode-excitation supply provides either +24 V to power external pre-amplifiers, or a precision 100 µA constant current source to excite RTDs or silicon diodes.
28718 Conditioner Features:
- 8 channels/card
- 128 channels per 28016 chassis 64 channels per 28008 chassis 32 channels per 28004 chassis
- Dual-mode excitation supply: +24 V or 100 µA precision constant current
- ±10 V, ±60 V, or 4-20 mA input modes
- Up to 30 kHz filtered bandwidth or 190 kHz wideband
- 5-wire plus shield input interface
- AC-coupled amplifier with programmable gain of x1, x2, x5, x10, x20, x50, x100, x200, x500, and x1000 with 0.1% accuracy
- 4-pole low-pass filters with programmable pulse/flat characteristics in two cutoff frequency ranges:
FX01: 100 Hz, 300 Hz, 1 kHz, 3 kHz, 10 kHz
FX02: 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz - 2º phase match between any channels
- Pre-filter overload detection
- Two rear-panel 26-pin high-density D input connectors with machined gold-plated pins
- Outputs on 26-pin D connector that is integral to the 28000 system M5 chassis
- Auxiliary front panel output connection to support multiple buffered outputs or RMS to DC using plug-on adapter modules
28718 Applications:
- RTD conditioning
- Silicon diode conditioning
- Internally amplified pressure or accelerometer conditioning
- Measure 4-20 mA sensors
- Low-level AC or DC amplifier (< 1 mV to 10 V inputs)
- High-level inputs to 60 V
- Anti-aliasing filter/amplifier
Octal-channel Signal Conditioner for Voltage, RTD, and 4-20 mA Sensors
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. Learn more about 28000 NIST Traceable Testing >