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Model 6729, 8-Channel Voltage/IEPE Amplifier-Filter-Digitizer


Features

  • AC or DC coupled inputs
  • 2 to 20 mA current excitation
  • Gains 1 to 5,000 with 0.05% accuracy
  • 4, 6 or 8-pole, low-pass filter
  • 100 kHz signal bandwidth
  • Up to 200 kS/s per channel with 16-bit resolution
  • Buffered ±10 Volt analog output

Description

The 6729 input module has eight channels each providing excitation for IEPE transducers, programmable AC or DC-coupled differential instrumentation amplifier, low-pass filter and analog to digital converter. Sample rate is programmable up to 200 kS/s with 16-bit resolution. Each channel has a buffered analog output that can be selected for wideband or filtered response.

Using amplifier/digitizer-per-channel architecture the 6729 provides high bandwidth and digitizing speed with excellent channel-to-channel time correlation. It offers the highest accuracy and completely eliminates crosstalk between channels. It may be used to condition and digitize signals from piezoelectric transducers with built-in or in-line charge amplifiers and other AC or DC voltage measurements. Input attenuation and current inputs, including 4-20 mA current loop, are available.

An adjustable 2-20 mA current source with 24 Volt compliance is provided for powering IEPE transducers. Gain is programmable from 1 to 5,000 providing ±2 mV to ±10 Volts full scale input sensitivity. Zero and gain calibrations are automatic.

Bandwidth is DC, 1 Hz when AC coupled, to 100 kHz. The low-pass filter may be employed to minimize alias errors for data sampling. A plug-in resistor module establishes the desired frequency. Filter frequency may be specified at the time of ordering. Frequency modules are available from 250 Hz to 50 kHz.




Overview  · Input  · Excitation/Transducer Power  · Amplifier  · Filter  · Digitizer  · Calibration  · Mechanical  · Ordering Information 

Overview

Measurement Type
4-20mA
ICP/IEPE
Insrumentation Amp
Voltage

Analog Bandwidth
100 kHz

Excitation/Transducer Power
±12V
±15V
28V
ICP

Filter

4-Pole

6-Pole

8-Pole

Sample Rate
Up to 200 kS/s

Analog Output
Buffered Analog Output


Input

Configuration

8 channels, differential, 2-wire with shield.

Input Type
Programmable AC or DC input. Input attenuator and current input are available.

Range
±2 mV to ±10 Volts.

Impedance (AC)
100k Ohms, shunted by 1,000 pF.

Impedance (DC)
50 Megohms, shunted by 500 pF.

Protection
±50 Volts differential, ±30 Volts common mode.


Excitation/Transducer Power

Current
2 to 20 mA. 6 mA is supplied unless otherwise specified.

Minimum Compliance
24 V

Verification
Short and open detection.

Voltage
±12 or ±15 Volts jumper selectable per channel, ±24 also available.


Amplifier

Gain
Programmable 1 to 5000, in 1, 2, 3, 5 steps, with ±0.05% accuracy

Gain Stability
±0.01%, ±0.005%/ºC.

Linearity (Amplifier)
±0.01% for Gains < 1,000, ±0.02% for gains > 1,000.

Common Mode
60 dB plus gain in dB to 110 dB, DC to 60 Hz.

CM Voltage
±10 V

Zero
Automatic to ±1 mV.

Zero Stability X1
±1 mV, ±0.2 mV/ºC

Zero Stability X1000
±5 mV, ±1 mV/ºC

Noise X1
0.2 mV RMS for 20 kHz bandwidth.

Noise X1000
2.8 mV RMS for 20 kHz bandwidth.

Bandwidth
DC to 100kHz for Gains 1 to 1,000 and 50kHz for Gains > 1,000 (-3dB). 1Hz to 100kHz (-3dB) in AC coupled mode.

Slew Rate
3.2 V/µS

Analog Output (Amplifier)

±10 Volts full scale, 20 mA. Programmable for wideband or filtered response.


Filter

Type
Single frequency four-pole (standard) or 4 frequency four-pole or 2 frequency eight-pole Bessel.

Frequency
From 500 Hz to 50 kHz
Standard Four Pole: 10 kHz
4 Frequency Four Pole: 10 Hz, 1 kHz, 10 kHz, 20 kHz
2 Frequency Eight Pole: 2 kHz and 20 kHz.

Noise
1 mV peak, RTO.

Other
Other filter characteristics and cut offs are available.


Digitizer

Sample
±50 ns channel-to-channel time correlation.

Resolution
16-bits, two's complement output per channel.

Rate
Programmable up to 200 kS/s digitizer per channel.

Digitizer Linearity
±1-1/2 LSB (±0.004%)

Continuity
Monotonic to 15 bits.

Alarms

Two alarms each with upper and lower limits that are programmable from negative to positive full scale. Limits checked on each ADC sample.


Calibration

Voltage Substitution

Alternate input for external calibration source. Programmable 1, 0.1 and 0.01, attenuation with ±0.02% accuracy. Attenuator output may be connected to output bus for accuracy check.

Zero Calibration
Amplifier input disconnected and shorted for zero calibration.


Mechanical

Mounting
Occupies one slot in Series 6000 enclosures.

Connectors

Input connector is 50-pin Type D. Output is 15-pin Type D High Density. Mating connectors are supplied.

Temperature
0 to +50 ºC


Ordering Information 

Ordering Information

6083 - 8-Channel BNC Adapter

6729-BE4 - 8-Ch Voltage/IEPE Single Freq, 4-Pole Bessel

6729-HV - 8-Ch Voltage Digitizer w/ 100:1 Attenuator

6729-I - 8-Ch Current 0-20mA Digitizer

6729PF2-BE8 - 8-Ch Voltage/IEPE 2-Freq, 8-Pole Bessel

6729PF4-BE4 - 8-Ch Voltage/IEPE 4-Freq, 4-Pole Bessel


 DOWNLOADS 

Model 6729
(PDF, 88KB)


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