M133C Electric Power/Energy Calibrator
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Operation manual
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.
