Gossen MetraWatt METRAmax 6 User manual

Operating instructions
METRAmax 6
Analog Multimeter 3-348-602-02
6/10.15

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Operating Controls
1 Range selector switch
2 Rotary knob to adjust the full-scale deflection
3 Socket connectors
4 Battery compartment
5 Nose to open the meter
6 Adjustment screw for the mechanical zero
(∞on black scale)
6
1
2
3
5
4
1,5 V
R6

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Table of Contents
Page
1 Safety Features and Precautions ........................................ 4
2 Description ......................................................................... 6
3 Operation ............................................................................ 7
3.1 Inserting the Battery .......................................................................... 7
3.2 Checking the Mechanical Zero ........................................................... 8
3.3 Battery Test ...................................................................................... 8
4 Measurement ..................................................................... 9
4.1 Resistance Measurement .................................................................. 9
4.1.1 Measuring in the Range up to 50 Ω(Ωx 1, red) .............................. 10
4.1.2 Measuring in the Ranges up to 1 MΩ
(Ωx 1/10/100/1000, black) ............................................................ 10
4.2 Rough Capacitance Measurement .................................................... 11
4.3 Diode and Transistor Test ................................................................ 12
4.4 Acoustic Continuity Test .................................................................. 13
5 End of Measurement ........................................................ 13
6 Characteristic Values ........................................................ 14
7 Maintenance ..................................................................... 16
7.1 Battery ........................................................................................... 16
7.2 Fusible Link .................................................................................... 16
7.2.1 Fuse Replacement .......................................................................... 16
7.3 Housing .......................................................................................... 17
7.4 Device Return and Environmentally Compatible Disposal ................... 17
8 Repair and Replacement Parts Service
Calibration Center and Rental Instrument Service ........... 18
9 Product Support ................................................................ 20

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1 Safety Features and 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 Messtechnik GmbH.
The analog multimeter METRAmax 6 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 6 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 6 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.

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• Measurements under moist ambient conditions are not allow-
able. 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’.
Measuring Categories and their Significance per IEC 61010-1
The measuring category and the maximum rated voltage
which is printed on the device apply to your measuring
instrument, 300 V CAT III.
CAT Definition
I
Measurements in electrical circuits which are not directly connected to
the mains: e.g. electrical systems in motor vehicles and aircraft,
batteries etc.
II
Measurements in electrical circuits which are electrically connected to the
low-voltage mains: via plug, e.g. in household, office and laboratory
applications
III
Measurements in building installations: stationary consumers, distributor
terminals, devices connected permanently to the distributor
!

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2 Description
The METRAmax 6 is a battery-powered ohmmeter. It
excels by its handy size, ease of use, and a large measur-
ing span. It is meant for measurement of resistances
between 0.05 Ωand 1 MΩ, for rough capacitance mea-
surements between 1 μF and 30,000 μF, and for continuity
tests with beeper.
The METRAmax 6 offers 9 measuring ranges for resistance
and capacitance measurements. The measuring ranges
are selected with a range switch.
The meter has a rugged movement with spring-loaded
jewels. It is widely insensitive to vibrations and shocks.
The scale is mirror-backed for exact reading of the mea-
sured values.
The measuring range Ωx 1, marked in red, and the scale
marked in red are provided for measurements of small
resistance values (0.05 Ωbis 50 Ω). To measure higher
resistance values, there are 4 measuring ranges which
have a common black scale.
A part of the two scale arcs is boldly marked. The measur-
ing error, referred to the actual resistance value, is smallest
on these marked indicating ranges.
For rough capacitance measurements, there are 4 measur-
ing ranges with a common scale.
A beeper is incorporated for audible continuity tests.
The connectors are protected against accidental contact. It
is recommended to use measuring leads with shockproof
connection plugs (4 mm diameter).

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3 Operation
Attention!
!
Only voltage-free devices under test may be mea-
sured!
Prior to each measurement, check mechanical
zero and full-scale deflection.
3.1 Inserting the Battery
Prior to starting the METRAmax 6, insert a 1.5 V mignon
cell into the battery compartment. This requires removal of
the lower part of the case.
Attention!
!
Disconnect the measurement cables from the
measuring circuit before opening the meter!
➭Press the nose (5) on the rear of the meter inwards,
using an adequate tool, and remove the lower part.
➭Insert a leakproof 1.5 V mignon cell according to IEC
R6 into the battery compartment (4), paying attention to
the polarity markings. Verify that reliable contact is
made.
➭Replace the lower part of the case and press the two
parts together until they engage.

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3.2 Checking the Mechanical Zero
➭Place the METRAmax 6 into a horizontal position.
➭Set the range selector switch (1) to the "O" position
(OFF).
➭The pointer has to be exactly over the bar code of the
full-scale deflection (∞on the black scale).
➭Correct deviations with the adjusting screw (6) on the
rear of the meter with a screwdriver, if required.
3.3 Battery Test
➭Set the range selector switch (1) to the "Ωx 1" position
(red marking).
➭With the rotary knob (2), adjust the movement pointer
on the red scale to full-scale deflection (∞).
If the pointer can no longer be adjusted to full-scale deflec-
tion, or if the indication is instable after the adjustment, the
battery is exhausted and has to be replaced with a new
one, see chapter 3.1.

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4 Measurement
4.1 Resistance Measurement
Resistance is measured with DC voltage from the inserted
1.5 V mignon cell. The maximum measuring currents at
full-scale deflection, with a battery voltage of 1.5 V, are
listed in the range table (see chapter 6 "Characteristic Val-
ues").
If possible, select the measuring range in such a way that
indication is in the range of the boldly drawn scale arc. The
measuring error, referred to the actual resistance value, is
smallest in this range.
During prolonged resistance measurements, occasionally
check for full-scale deflection (0 Ωor ∞).
When switching the range selector switch (1) to another
resistance range, always check for full-scale deflection and
adjust with the rotary knob (2), if required.

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4.1.1 Measuring in the Range up to 50 Ω(Ωx 1, red)
➭Set the range selector switch (1) to Ωx 1 (red marking).
➭With the rotary knob (2), adjust the pointer to full-scale
deflection (∞) on the red scale.
➭Connect the unknown resistance Rxto be measured
and read the resistance value on the red scale.
4.1.2 Measuring in the Ranges up to 1 MΩ
(Ωx 1/10/100/1000, black)
➭Set the range selector switch (1) to one of the measur-
ing ranges Ωx 1 ... Ωx 1000, depending upon the re-
sistance value to be measured.
➭Short-circuit the measuring leads.
➭With the rotary knob (2), set the pointer to full-scale
deflection (0 Ω) on the black scale.
➭Connect the resistance RXto be measured to the mea-
suring leads and read the resistance value on the black
scale. The indicated value must be multiplied by the
specified factor in line with the selected measuring
range.
RX