Please refer to the below calibration steps for your Ultrasonic Hardness Testing System:

Step 1:
There are two HRC Blocks, one is 26.5, the other is 61.9. (Please check your block which may have a different value).

Step 2:
Measure the higher value hardness block first a few times. This will offer you a calculation of the average value. Note it down.

Step 3:
Press the “Set” button, the display shows “E”. That is the set state. In this case, if you press the SET button, there will be 4 group values. First: the high block value 61.9; second: the high profile value (which may be around 45 – this is set by factory to guarantee accuracy; third: the Low block value, 26.5; forth: is the low profile value, (which may be around 14 – this is also set by the factory to guarantee accuracy).

When you calibrate the system, you need to only adjust the High profile value and the low profile value to correctly adjust the systems calibration. If on the first step when running your tests, you get a high average value of for example, 65; you need to adjust the high profile value to a higher value. It won’t be (65-61.9=3.1), however, it may be 1,2,1.5,2.5. You will need to try it a few times to find the accurate value until you get your hardness block value of 61.9.

When calibrating the low value, the same process applies. Adjust the profile value to a higher value, when the test value is lower than the block value.