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23.3. What to do in case of failure
If an obvious failure occurs during the operation (e.g. the display is not lit, the fan is not turning), the calibrator
must be switched off immediately. First, check the fuse located in the power cord receptacle. Procedure is
following:
• Remove the end of power cord from the mains connector at the rear panel.
• Insert the blade of a flat screwdriver into the opening cut in the mains voltage selector and pry out the
fuse holder.
• Remove the fuse. Replace it with new fuse of the same rating if the fuse was broken.
• Replace the fuse holder, reconnect the power cord and switch on the calibrator. If the problem persists,
contact the manufacturer.
If an obvious fault is evidenced, e.g. a measurement range or an operating mode is not functional, the user
cannot correct the fault. Contact the manufacturer.
Hidden faults can cause different symptoms and be caused by different causes. Usually, they cause instability
of some parameter. Hidden defects can be caused by unacceptable distortion, degraded insulation etc. In this
case contact the manufacturer.
Sometimes it seems that the calibrator has hidden defect, when the rules for correct operation are not adhered
to. In this case, the fault is caused by the operator. Most frequent cases of false “hidden defects”:
• mains voltage out of tolerance limits or unstable
• wrong grounding of the measurement circuit (bad connection of the ground terminal of the mains outlet, or
several ground connection when grounding loops are formed)
• proximity to sources of intensive influence, whose products are spread through the mains or propagated
by the electromagnetic field
• strong electrostatic or electromagnetic field which can cause major instability during calibration using higher
impedance.
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