Hioki RM3544 - Page 18

Operating Precautions
10
Before Connecting Data Cables (USB, RS-232C)
Observe the following precautions when connecting the instrument and a
controller:
• To avoid faults, do not disconnect or reconnect the USB cable during instru-
ment operation.
• The USB and RS-232C interfaces are not isolated from the ground circuit.
Connect the instrument and the controller to a common earth ground.
Using different grounds could result in potential difference between the
instrument and the controller. Potential difference on the data cable can
result in malfunctions and faults.
• Before connecting or disconnecting the RS-232C Cable, always turn off the
instrument and the controller. Failure to do so could result in equipment
malfunction or damage.
• After connecting the RS-232C Cable, tighten the screws on the connector
securely. Failure to secure the connector could result in equipment mal-
function or damage.
Before Connecting the Printer
Because electric shock and instrument damage hazards are present,
always follow the steps below when connecting the printer.
• Always turn off the instrument and the printer before connecting.
• A serious hazard can occur if a wire becomes dislocated and contacts
another conductor during operation. Make certain connections are
secure.