The zero point cannot always be determined reliably on rough surfaces; polish the surface if possible. Air currents and external vibrations can also lead to high fluctuations in the readings or even incorrect measurements. For this reason, the instruments should be installed in a protected place (e.g. in the basement or on a below-ground floor). When measuring with very low forces, closed measurement boxes and damping tables also help to counteract external influences.
The indenter may be dirty or worn. WIN-HCU offers a cleaning procedure that should be carried out regularly. Also check whether you’ve selected the right force-time regime for your application. Different test parameters can lead to deviations.
If these steps still don’t help, a shape correction can also be carried out when the indenter is worn down. Note: Shape correction should only be undertaken by Fischer employees or other skilled / trained persons.
It’s possible that the wrong lens is set on the microscope. Try a different lens, and, if you have an instrument without automatic lens detection, make sure to select the correct lens in the WIN-HCU software.
Then, if the indentation is still not visible, you may have chosen too low a test force. In such cases, the impression can be seen using an atomic force microscope (AFM), for example. Yet another reason could be too large an offset between the microscope position and the actual measuring position. The offset settings can be found under Measuring stage ► Set microscope adjust.
For measuring coatings in micro-section, we recommend using the appropriate Fischer micro-section sample holder. If measurements are carried out on micro-sections without a suitable holder, the process of placing the indenter for each measurement can cause a systematic offset of the measuring position in relation to the microscope position.
It’s possible that the unloading curve was not recorded; please check your settings. In addition, very soft samples can deform (creep) under load, which is why the indentation hardness cannot always be determined. Use the ‘creep’ setting to determine the indentation creep (CIT). And use the setting Edit ► Application properties ► Parameter ► Linear extrapolation to determine the modulus of indentation EIT and the indentation hardness HIT according to ISO 1457.
The sample probably gave way under load during the measurement. Check whether the test sample is properly fixed. Depending on the shape of the part, use either the HM universal sample rack or the HM foil clamping device from Fischer.
The selected test force is too high for the thickness of the coating. The measurement is being influenced by the substrate material.
The Dynamic Measurement Mode can only be enabled when you’re logged on as administrator. If it still won’t activate despite administrator rights, that is usually due to some customer-specific security software. Try using a computer with less stringent security protocols.
Shape correction requires administrator rights. Please log in to the WIN-HCU accordingly. Note: Shape correction should only be undertaken by Fischer employees or other skilled / trained persons.
Please contact Helmut Fischer service.
You must first define the customized export under Settings ► Options ► User-defined export before you can run the export.
Select ? ► About Win-HCU. Here you’ll find, for example, the instrument’s serial number and the version of WIN-HCU.