Gossen MetraWatt METRAmax 2 Bedienungsanleitung

Operating instructions

METRAmax 2

Analog Multimeter 3-348-734-02

4/5.06

2 GMC-I Gossen-Metrawatt GmbH

Operating Controls

1 Adjustment screw for the mechanical zero

( OFF on scale)

2 Sliding function switch

3 Rotary range selector switch

4 Rotary knob for mid-scale setting of the electrical zero

5 Safety connection sockets

6 Nose to open the meter

7 Battery compartment

9 V

6F22

GMC-I Gossen-Metrawatt GmbH 3

Table of Contents

Page

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

2 Description ......................................................................... 6

3 Operation ............................................................................ 7

3.1 Initial Start-up ................................................................................... 7

3.1.1 Connecting the Battery ...................................................................... 7

3.1.2 Checking the Mechanical Zero ........................................................... 7

3.1.3 Checking the Electrical Zero .............................................................. 8

3.2 Voltage Measurement ....................................................................... 9

3.2.1 DC Voltage Measurement .................................................................. 9

3.2.2 Direct AC Voltage Measurement up to 300 V ................................... 10

3.2.3 AC Voltage Measurement with Superimposed DC Voltage Component

.10

3.3 Current Measurement ..................................................................... 11

3.3.1 DC Current Measurement ................................................................ 11

3.3.2 DC Current Measurement via Shunts ................................................ 12

3.3.3 AC Current Measurement ................................................................ 13

3.4 End of Measurement ....................................................................... 13

4 Characteristic Values ........................................................ 14

5 Maintenance ..................................................................... 16

5.1 Battery Replacement ....................................................................... 16

5.2 Fuse Replacement .......................................................................... 16

5.3 Cleaning ......................................................................................... 16

5.4 Device Return and Environmentally Compatible Disposal ................... 16

6 Repair and Replacement Parts Service

DKD Calibration Lab

and Rental Instrument Service ......................................... 17

7 Product Support ................................................................ 19

4 GMC-I Gossen-Metrawatt GmbH

1 Safety Features and Safety Precautions

This instrument fulfills the requirements of the applicable

European and national EC guidelines. We confirm this with

the CE marking. The relevant declaration of conformity can

be obtained from GMC-I Gossen-Metrawatt GmbH.

The analog multimeter METRAmax 2 is manufactured in

accordance with safety regulations IEC 61010-1/EN

61010-1/VDE 0411-1. When used for its intended pur-

pose, the safety of the operator, as well as that of the

instrument, is assured. Their safety is however not guaran-

teed if the instrument is used improperly or handled care-

lessly. It is therefore imperative that you read the operating

instructions thoroughly and carefully before placing the

METRAmax 2 into service, and that you follow all instruc-

tions contained therein.

Observe the following safety precautions:

• The instrument may only be operated by persons who

are capable of recognizing contact hazards and taking

the appropriate safety precautions.

• Contact hazards exist anywhere, where voltages of

greater than 30 V may occur (effective value).

• Be prepared for the occurrence of unexpected voltages

at devices under test (e.g. defective devices).

For example, capacitors can be dangerously charged!

• Housing and measurement cables may not be dam-

aged, e.g. by cracks or ruptures.

• No measurements may be made with the METRAmax 2 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.

GMC-I Gossen-Metrawatt GmbH 5

• Measurements under moist ambient conditions are not

allowable. Hands, shoes, floor and workplace must be

dry.

• Be absolutely certain that the measuring ranges are not

overloaded beyond their allowable capacities.

Meaning of Symbols on the Instrument

indicates EC conformity

Warning concerning a point of danger.

(Attention: observe documentation!)

This device may not be disposed of with the

trash. Further information regarding the WEEE

mark can be accessed on the Internet at

www.gossenmetrawatt.com by entering the

search term ’WEEE’.

6 GMC-I Gossen-Metrawatt GmbH

2Description

On the METRAmax 2, the measuring ranges are selected

with a sliding function switch and a rotary range selector

switch. The scale is mirror-backed.

The rugged plastic case and the spring-loaded jewel bear-

ings of the stray-field-insensitive moving-coil movement

with core magnet protect the meter against damages in the

case of severe mechanical stress.

The electrical zero of the pointer can be positioned at mid-

scale. This allows for bipolar DC voltage and DC current

measurements regardless of the polarity.

The connection sockets are protected against accidental

contact. Both the special test leads with contact-protected

connection plugs and all test leads with commercial

banana plugs (4 mm diameter) can be used.

The DC current measuring ranges can be expanded by

means of a shunt (e.g. 10 A/100 mV).

The meter is of service-friendly design.

GMC-I Gossen-Metrawatt GmbH 7

3Operation

3.1 Initial Start-up

3.1.1 Connecting the Battery

The battery compartment (7) contains a 9-V battery (IEC

6F22) which is not connected. To connect the battery, it is

required to remove the lower part of the case. For this pur-

pose, press the nose (6) on the front of the meter inwards,

using an adequate tool. Securely connect the battery con-

tacts to the battery clip located in the battery compart-

ment. Ensure reliable contact making. Replace the lower

part of the case and press the two parts together until they

engage.

Attention!

Both measurement cables must be disconnected

from the measuring circuit before opening the

meter!

Note

The integrated battery switches off automatically

after 45 minutes. Switching off and on again of the

sliding function switch activates the power supply.

3.1.2 Checking the Mechanical Zero

The METRAmax 2 must not be connected when checking

the mechanical zero.

➭Set the sliding function switch (2) to the "0" position

➭Place the METRAmax 2 in a horizontal position

➭The pointer must be located exactly above the line

marked " OFF"

8 GMC-I Gossen-Metrawatt GmbH

➭Correct the deviation by means of the adjustment

screw 1 on the bottom of the case using a screwdriver,

if required.

3.1.3 Checking the Electrical Zero

➭Set the sliding function switch (2) to the position,

select the measuring range

➭The pointer must rest exactly above the line for the zero

at mid-scale

➭Correct deviations by means of the rotary knob (4), if

required

3.1.4 Battery Test

➭Set the sliding function switch (2) to the " " position

➭Set the rotary range selector switch (3) to the " "

position

➭The pointer must travel into the battery test section

marked " "

If the pointer no longer travels into the battery test section,

or if there is an instable indication, the battery is exhausted.

It must be replaced with a new one (see chapter 5.1 on

page 16, Battery Replacement).

GMC-I Gossen-Metrawatt GmbH 9

3.2 Voltage Measurement

3.2.1 DC Voltage Measurement

Operating Mode: Electrical Zero at the Left

➭Set the sliding function switch (2) to the position

➭Set the rotary range selector (3) to the corresponding

measuring range position:

V 300 V ... 100 mV

➭Connect the METRAmax 2

➭Read the measured value: black scale

Operating Mode: Electrical Zero at Mid-scale

➭Set the sliding function switch (2) to the position

➭Set the rotary range selector (3) to the corresponding

measuring range position: V 300 V ... 100 mV

➭Check that the pointer rests at mid-scale, see chapter

3.1.3 on page 8

➭Connect the METRAmax 2

➭Read the measured value: red scale +/–

10 GMC-I Gossen-Metrawatt GmbH

3.2.2 Direct AC Voltage Measurement up to 300 V

➭Set the sliding function switch (2) to the position

➭Set the rotary range selector switch (3) to the corre-

sponding measuring range: V 300 V ... 3 V

➭Connect the METRAmax 2

➭Read the measured value: black scale

To keep the influence of the frequency as low as possible,

the connection socket " " should be connected to the

ground potential as directly as possible or to lowest point

with respect to ground.

3.2.3

AC Voltage Measurement with Superimposed DC Voltage

Component

The DC voltage component, such as occurs with an ampli-

fier output stage, for example, can be cut off by means of a

capacitor (recommended value: 4.7 µF/630 V). In this case,

the additional service error is smaller than 0.2% at a mea-

suring frequency of 50 Hz. The measuring procedure cor-

responds to the one described above.

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