Keysight E4990A Troubleshooting Manual page 5

Safety Summary
4
When you notice any of the unusual conditions listed below,
immediately terminate operation and disconnect the power cable.
Contact your local Keysight Technologies sales representative or
authorized service company for repair of the instrument. If you
continue to operate without repairing the instrument, there is a
potential fire or shock hazard to the operator.
• Instrument operates abnormally.
• Instrument emits abnormal noise, smell, smoke or a spark-like
light during operation.
• Instrument generates high temperature or electrical shock
during operation.
• Power cable, plug, or receptacle on instrument is damaged.
• Foreign substance or liquid has fallen into the instrument.
Impedance Analyzer