Isolated High Density IEPE Conditioner with Long Distance TEDS™

High Density Conditioning Solution for IEPE Accelerometers and Remote Charge Converter (RCC’s)

The 28316C provides 16 channels of precision signal conditioning for IEPE (Integrated Electronic Piezoelectric) accelerometers or remote charge converters (RCC’s). Programmable channel gain and 4-pole low-pass filters provide clean, amplified “data acquisition ready” output signals. Each channel input can be isolated to allow connection to grounded accelerometers without introducing ground loops.

In addition, the 28316C maybe used as a 16-channel precision AC filter/amplifier with balanced differential input.

The 28316C features “on-the-fly” sensor bias monitor and sensor open/short detection. The AC current test mode creates a sensor based test signal to allow verification of the measurement chain. The 28316C is equipped with Precision Filters’ LDTEDS™ (Long-Distance Transducer Electronic Data Sheet) technology, allowing for communication with TEDS equipped sensors to a distance of up to 1500 feet.

The 28316C is a member of the Precision 28000 family of signal conditioners.

The 28000 Signal Conditioning System

Learn more about the 28000 Signal Conditioning System >

  • The 28316C precision signal conditioning for IEPE (Integrated Electronic Piezoelectric) accelerometers or remote charge converters (RCC’s)

    The 28316C Isolated High Density IEPE Conditioner.

    MEASUREMENTS:

    • IEPE Accelerometers
    • Charge Accelerometers with Remote Charge Converter (RCC)
    • Vibration Measurements
    • Acoustic Measurements
    • Modal Analysis
    • AC Amplifier/Filter Measurements

28316C Isolated High Density IEPE Conditioner Features:

28316C Isolated High Density IEPE Conditioner Features:

  • 16 channels per card; 256 channels per 28016 chassis system
  • IEPE conditioner or AC filter/amplifier with balanced differential input
  • Isolated channel input allows conditioning of grounded IEPE accelerometers without introducing ground loops
  • Precision Filters’ LDTEDS™ (Long-Distance Transducer Electronic Datasheet) compliant
  • Gain x1 to x512 with 0.1% resolution
  • Auto-gain setup for best ADC dynamic range
  • Programmable 4-pole low-pass filters
  • Current settings of 0, 2, 4, or 8 mA (programmable per channel)
  • Sensor bias detector; in-range or out-of-range
  • Overload detection
  • Output monitor, selects any one of 512 outputs
  • Test input for each channel

View the 28316C 16-Channel Isolated High Density IEPE Conditioner Specification Sheet >

28316C Isolation Mode

Many signal conditioners for IEPE sensors utilize a grounded input whereby the sensor “low” is connected to channel ground at the signal conditioner input. This is usually the most appropriate connection since the low input is often the shield of the coaxial cable. Occasionally however, the IEPE low connection is grounded at the sensor. This can be a troublesome situation as it creates a ground loop if the low side is also connected to ground at the signal conditioner. Simply disconnecting the low connection at the signal conditioner is not an option since IEPE current must be returned directly to the IEPE current source.

To solve this difficult problem, the 28316C has a programmable input stage that can be grounded or isolated from the channel ground. In isolated mode, the low connection can be grounded at the distant sensor location and no ground loops will be created. Proprietary IEPE circuitry assures that all IEPE current will be returned through the floating low connection and not through the chassis earth ground connection.

28316C Sensor and Cable Health

Traditional Go/No-Go tests for an IEPE amplifier allow insertion of a test signal to check the signal-conditioning channel. It is also standard to provide open and short detection on the sensor cables.

The 28316C provides these tests and two additional tests to verify sensor health. The operating bias point of an IEPE sensor may change before failing, so measuring the bias point is a means of monitoring the sensor health. The 28316C provides a readout of the bias voltage, as well as an ‘out of range’ indicator with user specified limits.

The second check is a measure of the output impedance of the sensor buffer, which may shift with a damaged sensor. A small AC calibration current is superimposed on the DC IEPE supply. This AC current reacts with the output impedance of the sensor to stimulate a sensor based AC test signal. This signal is useful as a measure of the device’s output impedance as well as to provide a stimulus for an end-to-end check of the sensor, cable, signal conditioning and data acquisition system.

Charge and IEPE Conditioner Comparison Guide

Card 28304 28324 28316C 28302B
Type Single Ended Charge,
IEPE (GND or ISO)
with Long Distance TEDS
Single Ended Charge,
IEPE (GND or ISO)
with Long Distance TEDS
IEPE (GND or ISO)
with Long Distance TEDS
Single Ended or
Differential Charge, IEPE or Velocity Coil Input
Channels/Card 4 4 16 2
Channels/System 64 64 256 32
Applicable Transducer Piezoelectric or IEPE Sensor, Remote Charge Converter, AC Voltage Piezoelectric or IEPE Sensor, Remote Charge Converter, AC Voltage IEPE Sensor with TEDS (Optional) and AC Voltage Piezoelectric or IEPE Sensor, Velocity Coil, AC Voltage
Interface 2-Wire Coaxial on Combo-D 2-Wire Coaxial on Combo-D 2-Wire with Shield 2 Wire Coaxial or 3-Wire LEMO
Excitation IEPE Current, 0, 4, 8, 12 mA IEPE Current, 0, 4, 8, 12 mA IEPE Current: 0, 2, 4 or 8 mA IEPE Current: 8.5 mA
Bandwidth 0.25 Hz to 450 kHz 0.5 Hz to 170 kHz 0.25 Hz to 140 kHz 0.3 Hz to 20 kHz
Gain x1/16 to x8192 with
0.05% Resolution
x1/16 to x1024 with 0.05% Resolution x1 to x512 with
0.1% Resolution
PE: 1 to 200 pC/g
IEPE: 0.1 to 200 mV/g
Filter 4, 8 Poles; FLAT/PULSE Low-Pass or Band Pass 4-Poles; FLAT/PULSE
Low-Pass
4-Poles; Time Delay or Butterworth 6-Pole HP, 6-Pole Low-Pass
Cut Off Frequencies FLAT: 2 Hz to 204.6 kHz PULSE: 1 Hz to 102.3 kHz FX02: 300, 1k, 3k,
10k, 30 kHz*
FX02: 300, 1k, 3k,
10k, 30 kHz*
HP: 0.3, 3, 10, 30, 100
LP: 50 Hz to 12.75 kHz in
50 Hz steps
PULSE: 1 HZ to102.3 kHz
Outputs (2) Buffered Single-Ended Outputs per Channel (2) Buffered Single-Ended Outputs per Channel (2) Buffered Single-ended Outputs per Channel (2) Accel, (2) Velocity,
(1) Displacement, (1) DC,
(1) Alarm
* Custom cutoff frequencies are available. Please consult factory.