High data accuracy, resolution, and precision (especially for
     applications that require very fast sampling and response).
  Enables new applications not previously possible due to the
     acquisition of better data.
  Increased reliability and robustness of the electronics due to
     the engineering design.
  Automatically determines optimal data acquisition parameters
     via built in intelligence.
•   Easier and less time consuming to engineer a solution due to
     the “plug and play” architecture.
•   Enables miniaturization due to fewer components as compared
     to alternative solutions.
  Enables sensor manufacturers to integrate data acquisition
     intelligence directly into their sensor.

QDAC’s Generic Data Acquisition System (G-DAS800TM) The QDAC data acquisition unit is an eight channel data system designed to convert analog signals to digital form. The input signals can be either differential of single ended. In either case the allowed input signal range is +/- 5V. The design frequency range is from DC to 10kHz with a sampling rate selectable from 1ks/s to 100ks/s. The high sample rate can be for a single channel or for the aggregate sampling rate across all selected channels.

The system includes all necessary signal conditioning including anti-alias filtering and is designed such that pre-amplifiers are not necessary. The system architecture is based on a patented approach for combining the required analog signal conditioning and subsequent digital processing. The approach guarantees that the overall signal condition is correctly matched with the selected sampling rate. The measurement resolution is in the micro-volt range even with the +/-5V system capability, thereby eliminating the need for pre-amplifiers. The system includes voltage output to supply single ended or double ended drive voltages to sensors, thereby eliminating the need for additional power sources.

The system is supplied with software that can be run on any modern PC to provide the user with immediate access to system control and output data. The software allows the user to select the desired channels and the desired output sampling rate. As indicated above the signal conditioning will be set automatically to correspond to the selected output sampling rate.The system communicates to the PC through a USB connector.

INPUT SPECIFICATIONS
Input signal type:  • Differential or single ended
   Input voltage range:
   Differential mode (from IN+ to IN-):
 • +/- 5 Volts measured differentially (1)
  Single ended mode from IN+ to GND,
with IN- connected to GND:
 • +/- 5 Volts (1)
    Single ended mode from IN- to GND,
with IN+ connected to GND:
 • +/- 5 Volts (1)
  Input impedance:
   • 200 kOhms in single ended to ground
  Single ended mode from IN+ to GND,
with IN- connected to GND:
 • 400 kOhms differentially
 Absolute maximum input voltage:
Unit Powered on:
 • 45 VDC (4)
Unit turned off:
 • 33 VDC (4)
Offset voltage:  • 0.01V maximum after warm up
Gain accuracy:  • +/- 1 %
Bandwidth  • DC to 10kHz
Noise Floor:  • 10-12V 2/Hz 10Hz to 10kHz (3)
Cumulative Noise:  • DC to 100Hz: < 10 micro-V RMS
 • DC to 10kHz: < 20 micro-V RMS)
1/f Noise:  • 10 -11V 2/Hz at 1 Hz
Input protection:  • Input amplifier protected to 13KV ESD (2)
In band ripple:  • 0.05 dB Maximum to 0 to 50% of Bandwidth (3)
 • 0.5 dB Maximum 50% to 75% of Bandwidth (3)
Analog filter bandwidth:  • 100 Khz
Channel to channel isolation:  • 110 dB typical
Digital filter bandwidth:  • 1 /10 of selected sample rate
Recorded data:  • Software selectable format with 24 bits resolution

uNIT SPECIFICATIONS
Operation temperature:  • -20 to 35 °C.
Power supply:  • 115VAC
 • 20 Watts
Power supply output:  • P +5 V DC
 • +/- 12V DC
Chassis ground:  • through power supply ground

Note 1: It is recommended to use the unit at +/-4.75V range or below to              prevent saturation or distortion of the input signal.
Note 2: Input amplifier specifications by design.
Note 3: Typical by design.
Note 4: By design, not tested.

 
 
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