Hioki DM7275 Series - Page 16

10
Operating Precautions
Before starting a measurement
Voltage measurements
DANGER
•
Themaximumratedvoltagebetweeninputterminalsandthegroundisas
follows.
CATII:300VAC/DC
Nomeasurementcategory:800VAC/DC
Iftheirvoltagesareexceeded,thisinstrumentwillbedamagedandpersonal
injurywillresult.Therefore,donotperformmeasurementinthiscase.
•
Maximuminputvoltageofthevoltagemeasurementterminalsis1000VDC,
10
5
VHzAC,1500Vpeak.However,voltagesover800Vcanbemeasuredonly
if the circuit to be measured is isolated from the ground. If their voltages are
exceeded,thisinstrumentwillbedamagedandpersonalinjurywillresult.
Therefore,donotperformmeasurementinthiscase.
•
Toavoidelectricshock,becarefultoavoidshortinglivelineswiththe
measurement cables.
Temperature measurements
CAUTION
• To avoid damage to the instrument, do not apply voltage to TEMP.SENSOR
connector.
• Temperature sensors are not waterproof. Do not soak the sensor in water.
IMPORTANT
• The object to be measured for temperature compensation and the temperature sensor
should be given adequate time to adapt to the ambient temperature. If lesser time is given for
adaptation to ambient temperature may cause larger errors.
• Handling temperature sensors with bare hands may cause induction noise resulting in unstable
measured values.
• Temperature sensors are used to measure ambient temperature. Temperature sensors on the
surface of the object to be measured cannot measure correct temperature of the object itself.
If there is a large difference in temperature between the ambient temperature and temperature
of the object to be measured, use an aluminum tape to attach the temperature sensor onto the
object while ensuring that the object is not short-circuited.
Before connecting the communicationcables(USB,LAN,RS-232C,GP-IB)
CAUTION
Before connecting or disconnecting any communications cable, always turn off the
instrument and equipment to be connected with. This may cause malfunction or
damage.
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