Precision 28918A

8-Channel CVLD/IEPE Conditioner

Precision 28918A

for the 28000 Analog Signal Conditioner

Overview

28000 Analog Signal Conditioning System

Precision 28918A Features

• Eight channels per card
• 128 channels per 28016-M3 or 28016-M5 mainframe, 64 channels per 28008-M3/M5 mainframe, 32 channels per 28004-M3/M5 mainframe, 16 channels pre 28002-M5 mainframe
• IEPE, CVLD or voltage inputs
• Isolated IEPE mode to break cabling ground loops
• Up to 30 kHz “filtered” bandwidth or 190 kHz “wide-band” bandwidth
• Compatible with single-ended Constant Voltage Line Drive (CVLD) sensors with 2-wire (coaxial) connections
• Programmable IEPE current to 0, 4, 8 12 mA
• Programmable CVLD excitation 10 or 15 V
• Programmable amplifier: x½ to x1024 with 0.05 x steps
• 4-pole low-pass filters with filter bypass (wide-band)
• 2° phase matching between any channels, 10 Hz to Fc
• 0.2° typical phase match 10 Hz to 30 kHz (unfiltered)
• Overload detection
• Sensor CAL signal for CAL equipped CVLD sensors

28918A Applications

• Vibration Measurements in high magnetic noise environments
• Platform noise
• Structure-borne noise
• Acoustic receivers
• Load, torque, dynamic force, dynamic pressure, shock, vibration and acoustic measurements
• Machine health monitoring
• Structural response tests

The new standard for the world’s most discriminating test labs.

The Precision 28000 signal conditioning system provides all the flexibility you need to manage your test measurements.

The Precision 28000 makes it easy to manage a test, with hundreds of channels and a mix of transducers. Choose charge, IEPE w/TEDS, voltage (filter amplifier), strain, thermocouple, RTD, potentiometer, current, frequency, or other transducers.

The built-in test hardware and software (optional) provide quick Go/No-Go tests, which can be run before each test, and rigorous Factory Acceptance Tests to assure you that the 28000 meets your most stringent requirements for critical applications. It won’t be long before these tests earn a permanent place in your maintenance routine. And since they are traceable to NIST, they eliminate the need for off-site calibration.

In every phase of your tests—record keeping, installation, design, setup, operation, maintenance, and upgrading—the Precision 28000 offers ways to help you save time and money over the life of the system.

28000 System Features

• Graphical user interface (GUI) and Ethernet network interface for system control
• Intelligent gain and system scaling algorithms
• Test input and output monitor busses
• Go/No-Go test with diagnostics to be used before tests
• Rigorous Factory Acceptance Test for maintenance
• Field-swappable AC power supplies
• Built-in temperature and power supply monitoring with alarms

The 28918A 8-Channel CVLD/IEPE Conditioner is a member of the Precision 28000 family of signal conditioners. The 28918A provides conditioning for CVLD accelerometers and IEPE (Integrated Electronic Piezoelectric) accelerometers.

The 28918A is a dual mode card operating in either CVLD mode or IEPE Mode. In CVLD Mode, small AC current signals are detected even in the presence of large noise voltage common with cabling in high magnetic field environments. The constant voltage excitation is programmable to 10 or 15 V. A buffered system test bus signal provides compatibility with CVLD sensors equipped with sensor cal input. In IEPE mode, the 28918A is compatible with either floating or grounded sensors with programmable IEPE current up to 12 mA. The 28918A provides an overall amplifier gain up to 1024 and up to 30 kHz filtered or 190 kHz wideband bandwidths.