Manual Gossen Metrawatt METRAHIT ULTRA BT (page 9 of 74) (English)

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GMC-I Messtechnik GmbH 9

Safety Precautions

• The multimeter may only be operated by persons who are ca-

pable of recognizing touch hazards and taking the appropriate

safety precautions. Touch hazards according to the standard

exist anywhere, where voltages of greater than 33 V TRMS or

70 V DC may occur. Avoid working alone when taking mea-

surements which involve touch hazards. Be certain that a sec-

ond person is present.

• Maximum allowable voltage between the voltage measuring

sockets or all connector sockets and ground is 600 V for mea-

suring category III and 300 V for measuring category IV.

• Be aware of the fact that dangerous voltage peaks with signifi-

cant frequency components of greater than 1 kHz are not dis-

played when the low-pass filter is activated. We recommend

measuring voltage without the low-pass filter first, in order to

be able to detect any dangerous voltages.

• Be prepared for the occurrence of unexpected voltages at de-

vices under test (e.g. defective devices). For example, capaci-

tors may be dangerously charged.

• Make certain that the measurement cables are in flawless con-

dition, e.g. no damage to insulation, no interruptions in cables

or plugs etc.

• No measurements may be made with this instrument in electri-

cal circuits with corona discharge (high-voltage).

• Special care is required when measurements are made in HF

electrical circuits. Dangerous pulsating voltages may be pres-

ent.

• Measurements under moist ambient conditions are not permit-

ted.

• Be absolutely certain that the measuring ranges are not over-

loaded beyond their allowable capacities. Limit values are in-

cluded in section 8, “Technical Data”, in the table entitled

“Measuring Functions and Measuring Ranges” in the “Over-

load Capacity” column.

• The multimeter may only be operated with installed batteries or

rechargeable batteries. Dangerous currents and voltages are

otherwise not indicated, and the instrument may be damaged.

• Observe visual and acoustic warning signals!

• The instrument may not be operated if the fuse cover or the

battery compartment lid has been removed, or if its housing is

open.

• The input for the current measuring range is equipped with a

fuse link.

Use specified fuses only (see page 63)! The fuse must have a

breaking capacity of at least 30 kA.

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Gossen Metrawatt METRAHIT ULTRA BT Manual

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