Signal Conditioner Boards



GAGE 3000 General Purpose Transducer Signal Conditioning Board:

Introduction:
The GAGE 3000 is a high quality interface board, used for interfacing any bridge-type type transducer such as Strain Gages, Pressure Sensors and other bridge-type transducers, as well as voltage producing devices such as Piezo Sensors, Temperature Sensors, Photo Diodes and EEG/ECG inputs.


Actual Size: 70.5 X 30.5mm

The GAGE 3000 provides a variable excitation, capable of driving up to 80mA, at voltage range of 1V to 20V. The excitation voltage is symmetrical about ground level, so that the common mode voltage is approx. 0V. For example: an excitation voltage of 12V will be ±6V relative to ground.

The GAGE 3000 can be configured as a single board for one transducer or up to six transducers on a single board.

The GAGE 3000 also contains an Instrumentation Amplifier, with a variable gain of 200-1500, and a variable offset control. The output of the Instrumentation Amplifier is fed to a double pole Low-Pass-Filter, then passed via a driver buffer to the output port. The cut-off frequency of the Low-Pass-Filter may be changed by replacing two capacitors, CX1 and CX2, with capacitors of other values. The following Table provides capacitors values for some often used cut-off frequencies:

Cut-Off Freq.

50Hz

100Hz

200Hz

500Hz

1kHz

2kHz

5kHz

10kHz

20kHz

Capacitor Value
CX1/CX2

330nF

150nF

80nF

33nF

15nF

8nF

3.3nF

1.5nF

1nF


The GAGE-3000 also has a bridge loading resistor Rx, connected in series with a variable trimpot (variable resistor) designated P2. The resistor is used for correcting the offset of a bridge, which has a high offset level that cannot be corrected by using the on-board offset control. This resistor has to be defined and connected by the user. Please note that this resistor may affect the linearity of the sensor, therefore it is recommended to correct the high offset by fixing the transducer.

The excitation of the GAGE-3000 may be changed by using a trimpot designated P6, while the excitation level may be measured between the -EXC and +EXC test points. The gain is adjusted using P1.

The GAGE-3000 requires an external stabilized power supply of ±8V to ±15V. We offer an optional battery power supply that works from a 12V battery.

  1. Block Diagram:
  1. Features:
  2. For use with any bridge-type transducers, pressure gages, strain gages, etc.
  3. High gain - 1500 standard, upto 20000 optional
  4. Ultra high input impedance - 1 GW
  5. High frequency response - upto 120kHz
  6. Built-in user-programmable Low Pass Filter
  7. Built-in excitation
  8. High common-mode rejection - 115dB min.
  9. Low noise, low offset and drift
  10. Low cost
  11. Applications:
  12. Weighing systems
  13. Interfacing of load cells to A/D cards
  14. Amplification of low-level sensors (Pressure Transducers, Light-sensing Devices, Thermistors, etc.)
  15. Medical applications: EEG, ECG, etc.
  1. Specifications:

Parameter

Value

Gain

100 - 1500 (adjustable by user) upto 10,000 - by request

Gain Non-Linearity

±0.002%

Gain Temp. Coef.

5ppm/C°

Input Offset Drift

1µV/C°

Output Offset Drift

25µV/C°

Input Offset Vs. Supply

85dB

Input Impedance

1G

Dift. Capacitance

5pF

CMRR (DC - 100Hz)

100dB

Bandwidth (Gain 100 - 1000)

20kHz min. (-3dB)

Setting time to 0.01%

80 µSec.

Input Noise Voltage (@1 kHz)

5nV/

Output Noise

100 nV/

Supply Voltage Range

±8V to ±15V

Excitation Level

±1V to ±10V

Excitation Current (max.)

80mA

Excitation Drift

15ppm/C° ±10 µV/C°

Excitation Noise (DC - 100kHz)

0.6mV max (@300R load)

Excitation Noise (DC - 1kHz)

0.2mV max (@300R load)

Operating Temperature

0 - 70C°

Bridge Resistance Range

50 - 20,000


For any sort of clarifications kindly contact:
info@globesolutionz.com