Gossen MetraWatt METRA HIT 1A Manuel utilisateur

Operating Instructions

METRA HIT 1A/2A

Analog Multimeter 3-349-305-15

5/8.11

2 GMC-I Messtechnik GmbH

1 Common connection for all measuring ranges (instrument earth)

2 METRA HIT 2A: connection for highest current measuring range 15 A

3 Connection for resistance measurement and capacitance measurement

(negative potential)

4 Connection for all voltage and current ranges

except for METRA HIT 2A: here current measuring range up to 1.5 A

5 Catch for locking the bottom part of the instrument

6 Set screw for mechanical zero setting of the pointer

7 Potentiometer knob

8 Range switch

GMC-I Messtechnik GmbH 3

Contents Page

1 Safety Features and Precautions ......................................4

2 Application ........................................................................6

3 Description ........................................................................7

4 Operation ..........................................................................8

4.1 Controls .........................................................................................8

4.2 Starting the Instrument (ΩMeasurement only) .................................9

4.3 Voltage Measurement ...................................................................10

4.3.1 DC and AC Voltages up to 500 V ...................................................11

4.4 Current Measurement ...................................................................12

4.4.1 DC and AC Voltages (METRA HIT 2A: up to 1.5 A) ...........................12

4.4.2 METRA HIT 2A: Direct and Alternating Currents up to 15 A ..............13

4.5 Resistance Measurements ............................................................14

4.6 Estimated Capacitance Measurement ............................................16

4.7 Measurement of Gain and Attenuation ...........................................17

4.8 Testing Diodes and Transistors ......................................................18

5 Technical Characteristics ...............................................19

6 Maintenace .....................................................................25

6.1 Battery .........................................................................................25

6.2 Housing .......................................................................................25

6.3 Fuses ...........................................................................................25

6.4 Device Return and Environmentally Compatible Disposal .................27

7 Standard Equipment .......................................................28

8 Recalibration ...................................................................29

9 Repair and Replacement Parts Service

DKD Calibration Center

and Rental Instrument Service .......................................30

10 Product Support ..............................................................31

4 GMC-I Messtechnik GmbH

1 Safety Features and Precautions

You have selected an instrument which provides you with a high

level of safety.

This instrument fulfills the requirements of the applicable Euro-

pean and national EC guidelines. We confirm this with the CE

marking. The relevant declaration of conformity can be obtained

from GMC-I Messtechnik GmbH.

The analog/digital multimeter has been manufactured and tested

in accordance with safety regulations IEC 61010–1:2001/

DIN EN 61010–1:2001/VDE 0411–1:2002. If used for its

intended purpose, safety of the operator, as well as that of the

instrument, is assured. However, safety cannot be guaranteed if

the instrument is used improperly or handled carelessly.

In order to maintain flawless technical safety condition, and to assure

safe use, it is imperative that you read the operating instructions thor-

oughly and carefully before placing your instrument into service, and

that you follow all instructions contained therein.

Observe the following safety precautions

• The instrument may only be operated by persons who are

capable of recognizing contact hazards and implementing

appropriate safety precautions. Contact hazards exist any-

where, where voltages of greater than 33 V RMS may occur.

• Avoid working alone when taking measurements which

involve contact hazards. Be certain that a second person is

present.

• Maximum allowable voltage between terminals (1), (2), (3), (3) and

ground is equal to 500 V category II.

GMC-I Messtechnik GmbH 5

• The instrument may only be used for current measurement in

power systems if the electrical circuit is protected with a fuse or a

circuit breaker with a rating of up to 20 A. In order to conform to the

CAT requirements, two fuse links have been fitted for the ranges

mA und A.

• Be prepared for the occurrence of unexpected voltages at

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

capacitors may be dangerously charged.

• Make certain that the measurement cables are in flawless

condition, e.g. no damage to insulation, no interruptions in

cables or plugs etc.

• No measurements may be performed with this instrument in

electrical circuits with corona discharge (high voltage).

• Special care is required when measurements are made in

HF electrical circuits. Dangerous pulsating voltages may be

present.

• Measurements under moist ambient conditions are not per-

mitted.

• Be absolutely certain that the measuring ranges are not

overloaded beyond their allowable capacities. Limit values

can be found in the “Measuring Ranges” table in chapter 4

„Operation“.

6 GMC-I Messtechnik GmbH

Meaning of symbols on the instrument

Warning concerning a point of danger

(Attention: observe documentation)

Continuous, doubled or reinforced insulation

CAT II Measuring category II instrument 500 V

Ground

Fuse

Indicates EU conformity

2 Application

The multimeter is suited for voltage, current and resistance mea-

surements and for the rough measurement of capacitance. It is

designed for universal use in electronics, radio and television

technology and digital technology and can be used for many

measuring tasks in the field of general electrical technology. The

meter is mainly used in the DIY sector as well as in the fields of

service, eductation and vocational training.

GMC-I Messtechnik GmbH 7

3 Description

The multimeter has measuring ranges for direct and alternating

voltage, direct and alternating current and resistance. Capaci-

tance values can be ascertained by rough measurements.

All the measuring ranges are selected by means of the central

range switch. They are clearly arranged in the rotary section of

the switch.

A mirror is placed behind the scale for accurate reading of the

measured values. The pivots of the measuring element and the

measuring range switch are located in line one above the other,

so that it is also possible to provide long scales for the Ωand dB

measurements. The rugged plastic case and the core-magnet

moving-coil measuring element with its spring-backed jewel

bearings protect the meter against damage when subjected to

rough mechanical stress.

The connection sockets are protected against accidental con-

tact. Both the special instrument leads with shock protection (KS

17) and all measuring leads with conventional banana plugs

(4 mm diameter) can be plugged in.

8 GMC-I Messtechnik GmbH

4Operation

4.1 Controls

Measuring range switch

The multimeter has only one rotary switch by which all the mea-

suring ranges are selected. The meter can be switched from the

direct voltage ranges to the corresponding alternating voltage

ranges, or from the direct current ranges to the corresponding

alternating current ranges, without switching off the measured

value.

It must be ensured that the measuring range switch is first set to

the highest measuring range when measuring voltage and current.

The switch then has to be switched to lower ranges until the

optimum deflection is obtained.

Connection sockets

The meter has connection sockets with shock-proof protection.

Their functions are as follows:

Socket „⊥“= common connection for all measuring ranges

(instrument earth)

Socket „+15 A

= METRA HIT 2A: connection for highest

current measuring range 15 A

Socket „Ω“= connection for resistance measurement and

capacitance measurement (negative poten-

tial)

Socket „+V,A “ =

connection for all voltage and current ranges

except for METRA HIT 2A: here up to 1.5 A

The sockets can accommodate the instrument leads with shock-pro-

tected connection plugs as well as all measuring cables with banana

plugs (diameter 4 mm).

GMC-I Messtechnik GmbH 9

Potentiometer knob

The rotary knob is used to set the full deflection 0 Ωwhen mea-

suring resistance as described in chapter 4.5 and capacitance

according to chapter 4.6.

4.2 Starting the Instrument (ΩMeasurement only)

Inserting the battery

The bottom half must be removed from the instrument in order to

install or exchange the battery.

Attention!

Before opening the instrument, the measuring leads

must be disconnected from the measuring circuit!

➭Press the catch on the rear of the instrument, using a test

point, banana plug or similar object, in the direction of the

arrow and remove the lower section.

➭Insert the 1.5 V mignon cell in accordance with the symbol

and pole sign.

Attention!

Only use a leak-proof 1.5 V mignon cell according to

IEC LR6/R 6! (AA-Size)

➭Place the instrument in the lower section of the housing and

gently press the two halves together until they lock into

place.

Mechanical zero point check

• Place the multimeter flat on the edge of a table. The lower

third of the instrument should project over the edge.

• Check the mechanical zero setting of the pointer.

10 GMC-I Messtechnik GmbH

• If necessary, adjust the set screw on the rear of the instru-

ment with a screwdriver to correct the setting.

Battery check

➭Set the range switch to the „Ωx1“position.

➭Short-circuit connecting sockets „⊥“ and „Ω“ using a mea-

suring lead.

➭Set the pointer to full deflection position 0 Ωusing potenti-

ometer knob.

If it is no longer possible to set the full deflection or if the reading

does not remain constant after setting, the mignon cell is spent

or the pigtail fuse is defective.

4.3 Voltage Measurement

Attention!

Regardless of the value of the measured voltage, as a

safety precaution, do not exceed the sum of 500 V

CAT II for measured voltage plus voltage against earth

when directly connecting up the multimeter!

The left-hand connection socket marked „⊥“ should be con-

nected whenever possible and for all voltage measurements to

the point with the lowest potential against earth.

Ce manuel convient aux modèles suivants

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