Operating Precautions
9
• For safety reasons, disconnect the power cord when the instrument is not used and before
connecting it to a device to be tested.
• To avoid damage to the instrument, do not input the voltage to the output terminals. Also do
not short between any terminals.
• When the instrument is turned off, do not apply voltage or current to the instrument. Doing
so may damage the instrument.
• Do not connect or disconnect connection cords from the current sensor or 9555-10 Sensor
Unit while the instrument is turned on. Doing so may damage the instrument, current sen-
sor, or 9555-10 Sensor Unit.
• Do not input current to the current sensor when it is not connected to the instrument or
when the instrument and 9555-10 Sensor Unit are turned off. Doing so may damage the
current sensor, instrument, or 9555-10 Sensor Unit.
• Correct measurement may be impossible in the presence of strong magnetic fields, such as near trans-
formers and high-current conductors, or in the presence of strong electromagnetic fields such as near
radio transmitters.
To measure accurately
• Warm up the instrument for more than 30 minutes before use.
• To maintain sufficient measurement accuracy of the instrument, be sure to help heat radiation.
e.g.) Keeping away the instrument from a heat, leaving sufficient clearances around the instrument,
installing cooling fans to the rack in which the instrument is mounted, or other measures.
• The recommended calibration interval of the instrument is one year.
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