Endevco 2775A Low Noise Signal Conditioner

Endevco 2775A Low Noise Signal Conditioner
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Endevco 2775A Low Noise Signal Conditioner Endevco 2775A Low Noise Signal Conditioner
Meggitt Sensing (formerly Endevco) 2775A
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Datasheet
Signal Conditioner
 
OPTIONAL ACCESSORIES
  • 35771 - Filter Card
  • 35818 - Integrator Card
 
Meggitt Sensing (formerly Endevco) 2775A Features
  • Multi-use, Wide Dynamic Range, Low Noise Signal Conditioner
  • PE, ISOTRON® and Remote Charge Converter Inputs
  • AC, Servo and DC Outputs
  • Isolated Input
  • Optional Filter or Integrator
Meggitt Sensing (formerly Endevco) 2775A Specs
INPUTS

 

Piezoelectric (PE) Input

Single-ended with one side connected to input common.

  • Input Charge: 3000 to 110 000 pC maximum depending on gain for instantaneous recovery

 

Isotron® Input

Single-ended with one side connected to input common.

  • Constant Current Excitation Supply: Adjustable from 0.5 to 20 mA DC with control located on main circuit board, factory set at 4 mA
  • Compliance Voltage: 21V maximum (AC + DC components)

 

Grounded Input Mode

The input common is connected to output common

 

Isolated Input Mode

The input common is isolated from output common by 50 M ohms minimum resistance in shunt with 600 pF maximum capacitance.

  • Common Mode Voltage: 6V pk maximum to meet all specifications; 500V pk absolute maximum without damage

 

Test Input

This input allows the insertion of a signal in series (transformer coupled) with the cable and the PE transducer.

 

External Calibration Input

An external calibration signal may be applied to the charge converter input through an internal capacitor of 1000 pF ± 0.5%

 

OUTPUTS

All Outputs are short-circuit protected, single-ended with one side connected to output common.

 

AC Output
  • Full Scale Voltage: 1V pk to 10V pk adjustable. Linear to 12V pk. Factory set at 10Vpk
  • Output Current: 85 mA pk maximum
  • Output DC Offset: 20 mV maximum, < 5mV typical

 

DC Output

This output is proportional to the peak average of the AC output signal.

  • Full Scale Output Voltage: 10 VDC
  • Output Current: 3 mA DC maximum
  • Output Offset Voltage: 30 mV DC maximum < 5mV DC typical

 

Servo Output
  • Output Sensitivity: Internally selectable 10mV/g, 100mV/g
  • Linear Output: 12V pk maximum from 1Hz to 20KHz
  • Output Current: 3mA pk maximum over specified frequency range
  • DC Offset: 17mV maximum, < 5mV typical

 

TRANSFER CHARACTERISTICS

Gain Range: .03 to 1000

 

Full Scale Ranges
Sensitivity Multiplier Full Scale Ranges, g pk
0.1 100 300 1k 3k 10k 30k
1 10 30 100 300 1k 3k
10 1 3 10 30 100 300
100 1 3 10 30    

 

FREQUENCY RESPONSE

The gain is flat within its bandwidth.

 

Piezoelectric Mode
  • Lower Cutoff Frequency, AC and DC Outputs:
    • Low frequency switch set at < 0.5 Hz; 0.5 Hz ± 0.1 Hz
    • Low frequency switch set at 2 Hz; 2.1 Hz ± 0.5 Hz
  • Upper Cutoff Frequency, AC and DC Outputs
     
The upper cutoff frequency depends on the full scale settling as follows:
Full Scale 1 3 10 30 100 300 1k 3k 10k 30k
-5% f (kHz) minimum 25 30 25 30 40 30 50 50 50 50

 

Remote Mode
  • Lower Cutoff Frequency, AC and DC Outputs
    • -5% at 0.5 Hz maximum
    • -3 dB at 0.2 Hz maximum
  • Upper Cutoff Frequency, AC and DC Outputs
    The upper cutoff frequency depends on the full scale settling as follows:
 
Full Scale 1 3 10 30 100 300 1k 3k 10k 30k
-5% f (kHz) minimum 24 24 24 24 30 35 70 70 70 70

 

POWER

Input Voltage - Selectable through a switch located on the main board

  • 90 - 110 V rms
  • 105 - 125 V rms
  • 210 - 250 V rms

 

CONNECTORS
  • PE Input: 10 - 32 Microdot®
  • Remote Input and Outputs: BNC, UG, 1094/U or equivalent