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23. CALIBRATOR’S MAINTENANCE
The multifunction calibrator is electronic instrument with microprocessor control. All blocks which are heavily
loaded during the operation are cooled by a fan.
23.1. Rules for correct operation
Especially the following rules should be adhered to guarantee correct operation of the calibrator:
• The calibrator can only be switched on and off by pressing the mains switch located at the rear
panel.
• Do not connect the calibrator to other voltage than set by the voltage selector.
• Do not block the vent openings located at the rear panel and bottom panel.
• The calibrator must not be operated in dusty environment. It was designed to be used in a
laboratory.
• No liquid or small objects can be permitted to enter the calibrator through the vent openings..
• Do not switch the calibrator outside its operating temperature range.
• Connect the instruments to be calibrated to proper output terminals. There is no way of protecting
the calibrator from the damage caused by some improper connections.
• Do not damage the output terminals by plugging in “bananas” thicker than the terminals were
designed for.
• Whenever possible, use the setup menu to ground Lo output terminal (GND U ON setup function).
• Do not overload the power stages by leaving the calibrator switched on with the load connected for
a long time, especially on 20 A current range and 200V and 1000 V voltage ranges.
• If the instruments to be calibrated are not connected to calibrator’s output terminals using original
cables, ensure that cables suitable for the calibration voltage and current are used. Maximum output
voltage can reach 1000 V AC and the maximum output current can reach 20 A AC.
23.2. Regular maintenance
The calibrator does not require any special maintenance of electrical or mechanical parts. If is gets dirty, the
case and the display can be cleaned by a wool rag moistened with alcohol.
The calibrator should be calibrated in the recommended 12-month intervals. A calibration center should
perform the calibration.
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