Hioki DM7275-01 - Page 17

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Operating Precautions
BeforemakingaconnectiontotheUSBconnector
CAUTION
• To avoid equipment failure, do not disconnect the USB cable while communications
are in progress.
• Use a common ground for both the instrument and the computer. Use of different
ground circuits will result in a potential difference between the instrument's ground
and the computer's ground. If the USB cable is connected while such a potential
difference exists, it may result in equipment malfunction or failure.
BeforeconnectingtotheRS-232CorGP-IBconnectors
CAUTION
• Use a common ground for the instrument, computer and programmable controller.
Use of different ground circuits will result in a potential difference between the
instrument's ground and grounds of the computer and programmable controller. If the
communications cable is connected while such a potential difference exists, it may
result in equipment malfunction or failure.
• After connecting the communications cable, tighten the screws on the connector
securely. Failure to secure the connector could result in equipment malfunction or
damage.
BeforeconnectingaUSBashdrive
CAUTION
• Inserting a USB ash drive upside down, backwards or in the wrong direction may
damage the USB ash drive or the instrument.
• Some USB ash drives are susceptible to static electricity. Exercise care when using
such products because static electricity could damage the USB ash drive or cause
malfunction of the instrument.
With some USB ash drives, the instrument may not start up if power is turned on while the USB
ash drive is inserted. In such a case, turn power on rst, and then insert the USB ash drive.
It is recommended to try out operation with a USB ash drive before starting to use it for actual
measurements.
Beforeswitchingthecurrentsink(NPN)/currentsource(PNP)
CAUTION
• Never switch between NPN and PNP while the instrument's power is on.
• Congure the NPN/PNP setting based on the externally connected device.
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