Circuit Note

CN-0411

Rev. 0 | Page 11 of 12

Test Setup

To measure electrical conductivity and TDS of a solution

sample, take the following steps:

1. Connect the sensor probe to the CN-0411 system either

through the BNC connector if it is available or wired

through the terminal block P2. Connect the conductivity

probe’s RTD wires to terminal block P3.

2. Dip the probe into the solution sample preferably at the

center of the container to maximize the accuracy of the

conductivity cell.

3. Set the cell excitation voltage and operating frequency

through serial commands from the terminal software

4. Set the conductivity probe cell constant and select the type

of solution and the conversion mode of the ADC. For a

detailed description of these settings, see the CN-0411 User

Guide.

5. Follow the prompts on the serial terminal to perform

conductivity or TDS measurements. Additionally,

calibration routines may be performed before any

measurement. See the CN-0411 User Guide for the detailed

procedure for calibration.

The performance of the circuit can also be tested without the

conductivity cell and sample solutions by using a precision

resistor of known value.

Hardware and software operation details are available in the

CN-0411 User Guide at www.analog.com/CN0411-UserGuide.