MR8740T_Quick guide_eng_20191016H.pdf - 第24页

18 Operation Precautions Before turning on the instrument W ARNING • T o prevent electrical shock and to maintain the safety specications of this instrument, connect the accompanying power cord only to an inlet. • Befor…

Operation Precautions

CAUTION

• To prevent cord damage, do not step on cords or pinch them between other objects.

Do not bend or pull on cords at their base.

• The cable is hardened in freezing temperatures. Do not bend or pull it to avoid tearing

its shield or cutting the cable.

• Do not use any cable terminated with a metal BNC connector for connecting cables

to the BNC jacks on modules. If you connect a metal BNC cable to insulated BNC

connector, the insulated BNC connector and instrument may be damaged.

• To prevent damage to the BNC connector, be sure to release the

locking mechanism, grip the head of the connector (not the cord),

and pull it out.

Before connecting a logic probe to a measuring object

DANGER

To avoid an electric shock, a short-circuit and damage to the instrument, supply

power from a single main to the instrument and a measuring object with the

accompanying power cord.

The ground pin of logic terminal of Model 9320-01 Logic Probe (or Model 9327

Logic Probe) is not isolated from the instrument ground. The ground is shared.

If each of the terminals are supplied with power from separate mains or power

is supplied through a non-grounded power cord, the measuring object and the

instrument may be damaged because a current may ow through the logic probe

due to the resulting ground potential difference between the terminals. The

following connection procedure is recommended to avoid this problem:

• Connect the power cord provided

to the instrument and supply

power from the same outlet as the

measuring object.

• Connect the ground of the

measuring object to the GND

terminal (functional earth terminal)

of the instrument.

(Always supply power from a single

main.)

Refer to “2.6 Supplying Power to

the Instrument” (p. 60).

Functional ground terminal

GND

Logic

probe

Model MR8740T

Measuring

object

Measuring

object

Logic

Probe

Operation Precautions

Before turning on the instrument

WARNING

• To prevent electrical shock and to maintain the safety specications of this

instrument, connect the accompanying power cord only to an inlet.

• 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.

CAUTION

Do not operate the instrument on any of the power sources (UPS or uninterruptible

power supply, DC/AC inverter) that provide rectangular-wave or pseudo-sine-wave

power. Doing so may damage the instrument.

Operation Precautions

Before connecting the instrument to external equipment

DANGER

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

exceeding the rated maximum to the external control terminals.

Model MR8740T

I/O terminal Maximum input voltage

IN1 10 V DC

IN2 10 V DC

OUT1 50 V DC, 50 mA, 200 mW

OUT2 50 V DC, 50 mA, 200 mW

TRIG.OUT 50 V DC, 50 mA, 200 mW

I/O terminals Maximum input voltage

EXT.TRIG 10 V DC

EXT.SMPL 10 V DC

WARNING

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

following precautions when connecting your external equipment to external

control terminals.

• Always turn off the instrument and any equipment to be connected before

making connections.

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

• Properly isolate the devices and systems to be connected to the external

control terminals from one another.

Always turn both devices off before connecting and disconnecting an interface

connector. This may cause an electric shock.

CAUTION

• Use a common ground to both the instrument and the connected equipment. Using

different ground circuits will result in a ground potential difference between the

instrument and the connected equipment. If the communications cable is connected

while such a potential difference exists, it may result in equipment malfunction or

failure.

• Before connecting or disconnecting any communication cable, always turn off the

instrument and your device to be connected. Failure to do so could result in an

equipment malfunction or damage to the equipment.

• After inserting the connector, securely tighten the screws of the connector. Failure to

do so could result in an equipment malfunction or damage to the equipment.

• To prevent damage to the equipment, use the recommended type of wires to connect

your external equipment to the external control terminal, or otherwise ensure that the

wires have sufcient withstand voltage and current capacity.

Refer to “2.3 Connecting the External Control Terminals” (p. 53).