Amplifier Calibration

This article will tell you how to recalibrate and check a Diagnosys 32-bit Differential Amplifier.

Step 1: Recalibrate Amplifier

1) Enter the C:/Multifocal folder.

2) Locate and open armtest.exe.

3) Select the Impedance tab. 

4) Set Impedance Options to Impedance Test.

5) Change Montage Channels to Start 0, Total 5.

6) Insert 0K resistance cables into all ports of the amplifier.

Image: 0K/10K Resistance cables.

7) Press Start Calibrate.

8) Collect at least 50 Averages.  Then press Stop.

9) Click Save 0K.

10) Remove the 0K cables from the amplifier and connect the 10K cables.

11) Press Start calibrate.

12) Collect at least 50 Averages.  Then press Stop.

13) Click Save 10K.

Close armtest.  The amplifier's impedance function has been recalibrated, new values are stored directly on memory chip on amplifier.

Step 2: Test Impedance

Open a protocol in Espion and use impedance cables to confirm that the imped function works correctly.

10% is the acceptable tolerance for the impedance.

Note: Calibration of the impedance function has no effect on data collection.  This function is only intended to provide feedback on the quality of the electrical connection of the electrodes to the test subject.