Precision Instrumentation Amplifier

• Differential Inputs converted to ground referenced output.

• 1000 times differential voltage gain.

• Can measure differentially in both directions due to 2.5v offset on output.

• Optional voltage supply to interface with sensors requiring external power.

• AC filtering on output including 50/60Hz rejection.

• Requires no external power if used inline with SMT’s data acquisition devices.

• Compatible with SMT A2, A3 and WiDAQ dataloggers.

• Compact design, can be placed inline between sensor and datalogger.

Connect the datalogger to the positive, negative and voltage out terminals.

The voltage port is located to the right of power and ground. The right most output is a filtered voltage output. Use this output if your signal appears to have any jitter or noise. Response time from this port is slower due to the noise cancelling capacitors. Connect the sensor to the +/- port.

 

Note: A 2.5V offset is applied. Before using determine the exact offset by shorting the +/- inputs and measure the voltage across Vout and Ground.

Output readings will then be: 2.500V– Reading = Amplified Reading

Electrical Performance

Voltage Supply: 5 V – 18V DC

Current Draw: Typical 1mA– MAX 20mA

Shorted Output Voltage: 2.500V +/- 10mV

Voltage Gain: 1000x (other gains available)

Error: +/- 1%

Max Output Swing: 0V – 3.000V

Start up Time: 5 ms

 

Environmental

Operating Temperature: 0° to 70°C°

Storage Temperature: -25° to 70°C

Humidity: 5% to 90% RH non-condensing

Electrostatic Discharge (ESD): 8kVdc air, 4 kVDC contact (exposed inputs)

 

Mechanical

Standard Enclosure

Case Dimensions Weight: 50mm (L) x 35mm (W) x 20mm (H) 15g Connections

Input: (+) – Positive Differential (-) – Negative Differential

Output (leaded version) Red – Power / 5v

Black – Ground

White – Voltage Output

 

Wire colour codes may differ depending on the type of cable used.