Precision 28608B

Octal Programmable Filter/
Amplifier

Precision 28608B

for the 28000 Analog Signal Conditioner

Overview

28000 Analog Signal Conditioning System

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

Precision 28608B Features

• Eight channels per card, 128 channels per 28016 chassis
• Balanced differential inputs with programmable AC/DC coupling
• Zero Suppress via a programmable DC voltage inserted at the channel input
• Distributed programmable gain of x1/16 to x8192 with 0.05% resolution
• Input MUTE mode to terminate unused channels in safe, quiet state
• Pre-filter overload detection
• Filter Choices:

4 or 8-pole low-pass filters with programmable pulse/flat characteristics for optimized time domain or frequency domain performance

4 or 8-pole high-pass filters

8-pole band-pass filters

• Programmable low-pass filter cutoff frequencies:

Pulse Mode: Programmable from 1 Hz to 102.3 kHz

Flat Mode: Programmable from 2 Hz to 204.6 kHz

• Wide-band (500 kHz) or filtered operation
• Precise digital calibration
• Single-ended outputs with ground sense
• Programmable test modes for cal signal injection and input short, allowing for automated measurement system validation
• Output monitor bus
• Auxiliary front panel output connection supports the use of Precision Filters’ output buffer modules for adding up to two buffered outputs per channel

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, set-up, 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 28608B Octal Programmable Filter/Amplifier card is ideal for conditioning low-level voltage inputs in front of high-resolution digital data acquisition systems. It features a choice of 4 or 8-pole low-pass filters, 4 or 8-pole high-pass filters and 8-pole band-pass filters with programmable characteristics for either time or frequency domain applications. The 28608B octal programmable filter/amplifier cards allow for up to 128 channels of programmable precision filtering in one 28016 sixteen-card chassis. The balanced differential input of the 28608B allows for connection to grounded loads without introducing ground loops or for measuring bridge type sensors.

28608B Applications

• Anti-Aliasing Filters with Programmable Amplifiers
• General Purpose Voltage Amplifier for Dynamic Measurements
• Low Drift DC Amplifier for Low-Level DC Signals
• Noise Filter
• AC or DC Bridge Filter/Amplifier
• Underwater Acoustics
• Pyroshock Measurements
• Wind Tunnels
• Automatic Test Equipment
• Industrial Process Control
• Reconstruction Filters
• Data Acquisition
• Signal Conditioning