PRECISION 28000
Signal Conditioning
System

28608 Quad Programmable
Filter Amplifier

The 28608 Octal Programmable Filter/Amplifier Card is ideal for conditioning low-level voltage inputs in front of high-resolution digital data acquisition systems.

The 28608 allows for up to 128 channels of programmable precision filtering in one 28016-M3 chassis. Low-pass, high-pass and band-pass configurations are available.

A choice of 4 or 8-pole low-pass filters, 4-pole high pass and 8-pole band-pass filters are available. Cutoff settings from 1 Hz to 204.6 kHz are supported. The low-pass filters may operate in either a "flat" mode for maximally flat pass-band amplitude response with sharp roll-off or in a "pulse" mode for low phase distortion and optimized transient response.

The "flat" mode provides pass-band characteristics nearly identical to a Butterworth filter while providing a much sharper roll-off. This mode is a good choice for applications such as spectral analysis. The "pulse" mode has time domain response similar to the Bessel filter yet provides superior amplitude response characteristics. The "pulse" mode is ideal for time domain applications including transient (shock) measurements and time domain waveform analysis.

Programmable pre- and post-filter amplifiers provide an overall gain of 2048. Gain is distributed both before and after the filter to provide protection from large out-of-band energy or transients that could cause clipping before the filter, distorting the data. The post-filter gain has resolution of better than 0.05% to enable system scaling of the outputs to match the full-scale input of the external recording device. Overload detectors alert the user to over-voltage conditions. Precise, automated digital calibration of gain and DC offset are provided.

Other features of the 28608 include a test input for injection of calibration signals into the channel input and a monitor output that allows for convenient monitoring of any channel output via a single BNC on the 28000 chassis.

Applications Examples

• Anti-Aliasing Filters with Programmable Amplifiers
• Automatic Test Equipment
• Data Acquisition
• Signal Conditioning
• Production Test Equipment
• Industrial Process Control
• Reconstruction Filters
• Programmable Band-Pass Filters

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SALIENT FEATURES

28608 Channel Diagram

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Optional Output Adapters

Measurement system requirements sometimes need multiple outputs per signal conditioning channel. These outputs may be routed to control systems, tape backup systems, auxiliary data acquisition systems, scope bays and other destinations.

Precision Filters manufactures output adapter modules to provide one additional fully buffered output per channel on eight BNC connectors. Eight-channel 28000 System signal conditioning cards are fitted with front panel connectors that accept the output adapter modules.

Download 28608 Octal Programmable Filter Amplifier Specification Sheet for the PF Publications Library.

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Applications Examples

• Anti-Aliasing Filters with Programmable Amplifiers

• Automatic Test Equipment

• Data Acquisition

• Signal Conditioning

• Production Test Equipment

• Industrial Process Control

• Reconstruction Filters

• Programmable Band-Pass Filters

Reference

The following Specifications
are available in  Precision Filters'
On-line Library 
for downloading:

28104 Quad Bridge Conditioner Specifications

28208 Octal Thermocouple Conditioner

27304 Quad Dual Mode Charge Amplifier

28314 Quad Dynamic Charge/IEPE Conditioner with LDTEDS

28316B 16-Channel TEDS/IEPE Accelerometer Conditioner

28454 Quad Conditioner Specifications

28524 Quad Frequency to Voltage Converter Modules

28608 Octal Programmable Filter Amplifier

27658A Octal Filter/Amplifier

27708A Octal 
AC/DC Amplifier

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