HGL Dragonfly Signal Conditioning

 

 

sig_cond

 

The low-power and cost conscious highly modular Dragonfly platform provides a basis for a wide range of individual low cost per channel conditioning modules, some of which can be stacked together to provide near universal conditioning within the compact Dragonfly chassis.

The Dragonfly conditioning modules provide a simple set of fully programmable functions (gain, coupling etc) specific to each module type. All modules also allow direct voltage inputs to be taken (bypassing the conditioning). Currently the module set includes:

 

Currently the module set includes:

 

IEPE 1x, 10x, 100x gain, AC coupled, CI generator (4 & 8 mA settings).
Bridge 1x, 10x, 100x, 1000x gain, DC coupled, CV generator (5V, 10V, 15V settings), shunt cal resistor, auto-zero function. 1/4, 1/2 and full completion options (120Ω, 350Ω, 1000Ω).
Dynamic Strain 1x, 10x, 100x, 1000x gain, AC coupled, CI generator (5mA, 10mA, 20mA).
Fixed Bridge  1000x fixed gain, 350Ω fixed completion, 1/4, 1/2, full bridge, auto zero function.
Thermocouple 1x, 10x, 100x gain, individual cold junction compensation per channel, most common thermocouple types supported





IEPE

iepe_ac_dc_cond

Specification 

Transducer

IEPE 8 Channels

4mA nom. @20V compliance (Provided from Base board)

Constant Current 8 channels Programmable together to give 10, 15 or 20mA ±0.25%
  Control Voltage Controlled current sources (Provided from Base Board)
  Compliance Programmable 10V max. or 22V max
  Impedance >250kΩ
  Stability 0.02% / °C
  Noise <15nA RMS 100kHz (equivalent to 1.5µStrain pk to pk in 350Ω)
  Protection ±30V @60mA max continuous, either input to ground
    +24V, -12V continuous, any current source, either input to ground

 

 

Amplifier section   8 identical amplifiers 

Input Impedance 2MΩ differential
  Protection ±30V max continuous, either input to ground
  CMR/CMV >72dB / ±10V
  Gain Programmable x1, x10, x100 (Baseboard gains x1, x10)
  Accuracy ±0.25%. T.C.<25ppm/°C
  Linearity Better than 0.01%
Frequency Range Bandwidth 0.5Hz to >100kHz -3dB (80kHz x100)
Noise Input <30µV pk-pk 0.5Hz - 100kHz measurement bandwidth
  Output <1mV pk-pk 0.5Hz - 100kHz measurement bandwidth
Output Voltage Capability ±10V into 2kΩ, 5000pF max

 

 

Overall 

Supply ±12V 4W max. (Provided from Base Board)
Ambient Temp Range -25°C to 70°C operating 
Physical Size Dragonfly Daughter Board

 

 

 

Bridge Strain

fe_1403_brg_iss3

 

Specification 

Transducer

Constant Voltage 8 Channels

Programmable individually to give 1, 2, 5, or 10V ±-.25%

  Capability 20mA minimum on all channels
  Control Voltage controlled voltage sources (Provided from Base Board)
  Regulation <±0.1% change in Bridge Volts for ±10% input change

 

Bridge Section

  8 channels Full and 1/2 bridge internally provided. 1/4 bridge requires an external completion resistor or gauge
  Auto Balance Digital potentiometer shunt auto-balance in feedback loop with selectable balance resistor: Coarse, Fine or OUT
  Completion Internal 1/2 Bridge 2 x 1kΩ matched and TC tracking
    1/4 bridge requires an external completion resistor

 

Amplifier section   8 identical amplifiers 

Input Impedance >10MΩ differential (balance resistor OUT)
  Protection ±30V max continuous, ±150V 1s, either input to ground
  CMR/CMV >100dB / ±10V
  Gain Programmable x1, x10, x100 (Baseboard gains x1, x10)
  Accuracy ±0.25%. T.C.<25ppm/°C
  Linearity Better than 0.01%
Frequency Range Bandwidth

DC to >100kHz -3dB (x1, x10)

DC to >80kHz -3dB (x100)

Noise Input <30µV pk-pk DC - 100kHz measurement bandwidth
  Output <1mV pk-pk DC - 100kHz measurement bandwidth
Output Voltage Capability ±10V into 2kΩ

 

 

Overall 

Supply ±12V 2.5W max. (Provided from Base Board)
Ambient Temp Range -25°C to 70°C operating 
Physical Size Dragonfly Daughter Board

 

Dynamic Strain

 

dyn_str

 

Specification 

Transducer Supplies

 

 

IEPE 8 Channels

4mA nom. @20V compliance (Provided from Base Board)

Constant Current 8 Channels Programmable together to give 10, 15 or 20mA ±0.25%.    
  Control Voltage controlled voltage sources (Provided from Base Board)
  Compliance    Programmable 10V max. or 22V max.    
  Impedance    >250kΩ.   
  Stability    0.02% / °C    
  Noise    <15nA RMS 100kHz (equivalent to 1.5μStrain pk to pk in 350Ω).    
  Protection    ±30V @60mA max continuous, either input to ground.    
    +24V, -12V continuous, any current source, either input to ground    

 

Amplifier Section - 8 identical amplifiers

 

Input    Impedance   

2MΩ differential

  Protection    ±30V max continuous, either input to ground.
  CMR/CMV    >72dB / ±10V.
  Gain Programmable x1, x10, x100 (Baseboard gains x1, x10).    
  Accuracy    ±0.25%. T.C.<25ppm/°C.
  Linearity       Better than 0.01%.
Frequency Range     Bandwidth       0.5Hz to >100kHz -3dB (80kHz x100).
Noise    Input       ±30V @60mA max continuous, either input to ground.    
  Output    <1mV pk-pk 0.5Hz - 100kHz measurement bandwidth.    
Output    Voltage    Capability ±10V into 2kΩ, 5000pF max.    

 

Overall

 

Supply    ±12V   

4W max. (Provided from Base Board).    

Environment    Temperature Range -25°C to 70°C operating 
Physical    Size Dragonfly Daughter Board.   
Input Channels 4 or 8
Output Channels 0
Input Connections BNC or 8 pin Lemo
Dimensions 100mm (W) x 44mm (H) x 75mm (D)
Host Connection Ethernet
Power POE or external 12-28V
Input Support
Voltage
Standard Ranges +/-10V. +/-1V, 0.1V (under software control)
Coupling AC & DC
Input Impedance >100kOhm
SNR >90dB
Sample Rate Selectable between 5kHz and 200kHz (standard). Downsampling of individual channels
available through the standard software
IEPE
Current 4mA
Voltage 1-24V max
Impedance 4kOhm max