Amplifier Calibration

how-to check a Diagnosys 32-bit Differential Amplifier's Calibration

1 Enter into the Multifocal folder located in the Computer's C:/ drive. 

2 Locate and open armtest.exe.

3 Select the impedance tab. 

4 Set Impedance Options to Impedance Test.

 

The next few steps check for the stored values of each amplifier channel. 

5 Change Impedance Display to Stored 0K (ADC).

Note the values in the Chan #-# column on the left side of the armtest window. 

Amplifier Serial Numbers 0 - 350, all values should equal ~23,000.

Amplifier Serial Numbers 350 - beyond, all values should equal ~28,000.

 

6 Change the Impedance Display to Stored 10K (ADC).

Note the values in the Chan #-#(#) column on the right side of this armtest window. 

Amplifier Serial Numbers 0 - 350 should list values equal to ~66,000.

Amplifiers Serial Numbers 350 - beyond should list values equal to ~82,000.

 

There are two possible outcomes of this calibration check. 

Outcome #1 .. all of the values fall within the appropriate range. In such case, the stored calibration values are correct.

Outcome #2 .. one or more of the Channels was off target value by 10% or more. In such case, the amplifier's stored values must be reset. 

 

Resetting stored values requires 0K/10K Resistance cables. 

 

 

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