MR8740、MR8741_user_manual_eng_20191016H.pdf - 第25页

Operating Precautions 13 Before Connecting to an External Device (model MR8741 only) T o avoid electrical hazards an d damage to the instrument, do not apply voltage exceeding the rated maximum to the input ter minals. I…

Operating Precautions

Before Connecting a Logic Probe to the Measurement Object

To avoid electric shock and short circuit accidents or damage to the instru-

ment, pay attention to the following:

• The ground pin in the LOGIC connector (plug) of the Model 9320-01 and

9327 Logic Probes (and legacy Models 9306 and 9320) is not isolated

from this instrument’s ground (common ground).

Use grounding-type polarized power cords for the measurement object

and this instrument, and obtain power from the same mains circuit.

Connecting to different mains circuits or using a non-grounding power

cord may cause damage to the measurement object or this instrument

because of current flow through the logic probes resulting from potential

difference between the grounds of the different wiring systems.

To avoid these problems, we recommend the following connection pro-

cedure:

Measurement

Object

Memory

HiCorder

Logic probe

Connect this instrument to the same

outlet as the measurement object us-

ing the (supplied) grounding polar-

ized power cord.

ground to the GND terminal

(functional earth terminal) of this

instrument.

(Always obtain power from the

same mains circuit.)

Measurement

Object

Logic probe

Functional

Earth Termi-

nals

GND

Memory

HiCorder

Before Turning the Power Supply On

• To avoid electrical accidents and to maintain the safety specifications of this

instrument, connect the power cord provided only to an outlet.ïï

• Before turning the instrument on, make sure the supply voltage matches that

indicated on its power connector. Connection to an improper supply voltage

may damage the instrument and present an electrical hazard.

• Avoid using an uninterruptible power supply (UPS), DC/AC inverter with rect-

angular wave or pseudo-sine-wave output to power the instrument. Doing so

may damage the instrument.

• To avoid damaging the power cord, grasp the plug, not the cord, when unplug-

ging it from the power outlet.

Turn off the power before disconnecting the power cord.

Operating Precautions

Before Connecting to an External Device (model MR8741 only)

To avoid electrical hazards and damage to the instrument, do not apply voltage

exceeding the rated maximum to the input terminals.

I/O terminals Maximum input voltage

START/IN1 -0.5 V to 7 V DC

STOP/IN2 -0.5 V to 7 V DC

SAVE/IN3 -0.5 V to 7 V DC

GO/OUT1 50 V DC 50 mA 200 mW

NG/OUT2 50 V DC 50 mA 200 mW

SMPL -0.5 V to 7V DC

TRIG OUT 50 V DC 50 mA 200 mW

EXT.TRIG -0.5 to 7 V DC

To avoid electric shock or damage to the equipment, always observe the follow-

ing precautions when connecting to external control terminals.

• Always turn off the power to the instrument and to any devices to be connected

before making connections.

• Be careful to avoid exceeding the ratings of external terminals and connectors.

• Ensure that devices and systems to be connected to the External control termi-

nals are properly isolated.

The ground pins of external control connectors are not isolated from the instru-

ment’s ground. Connect so that no potential difference arise between external con-

trol connector ground and the ground of the connection object. Failure to observe

this precaution can result in damage to the connection object and the instrument.

• Use a common ground for both the instrument and the connection equipment.

• Use of different ground circuits will result in a potential difference between the

instrument’s ground and the connected equipment’s ground. If the communica-

tions cable is connected while such a potential difference exists, it may result

in equipment malfunction or failure.

• While connecting or disconnecting the communication cables, ensure that the

power supply of the instrument and the device to be connected is cut off. This

may cause damage or malfunctioning.

• After connecting the communications cable, tighten the screws on the connec-

tor securely. Failure to secure the connector could result in equipment mal-

function or damage.

MR8740 does not support external control.

Operating Precautions

Disc precautions

• Keep the recorded side of discs free of dirt and scratches. When writing text on

a disc’s label, use a pen or marker with a soft tip.

• Keep discs inside a protective case and do not expose to direct sunlight, high

temperatures, or high humidity.

• Hioki is not liable for any issues your computer system experiences in the

course of using this disc.

Precautions During Shipment

Keep the packing material that was used for shipping this instrument because

you may need to use it when transporting the instrument in the future.