Gossen MetraWatt METRAmax 2 User manual

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
+
~
1
2
3
4
5
6
7

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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.

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• 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.

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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"

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➭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).

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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 +/–
+

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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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The DC component can be determined same as with DC
voltage measurement.
To protect the meter against overload, the selected mea-
suring range must always be higher than the DC voltage
component determined at first.
Attention!
!
Both voltage components must be tested before
switching to a lower measureing range.
3.3 Current Measurement
For all current measurements, connect the METRAmax 2 in
series with the consumer in the line having the lower poten-
tial to ground.
3.3.1 Direct DC Current Measurement
Operating Mode: Electrical Zero at the Left
➭Set the sliding function switch (2) to the position
➭Set the rotary range selector switch (3) to the corre-
sponding measuring range: A 3 A...100 µA
➭Connect the METRAmax 2
➭Read the measured value: black scale
+

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Operating Mode: Electrical Zero at Mid-scale
➭Set the sliding function switch (2) to the position
➭Set the rotary range selector switch (3) to the corre-
sponding measuring range: A 3 A...100 µA
➭Check that the pointer rests at mid-scale, see chapter
3.1.3 on page 8
➭Connect the METRAmax 2 according to the wiring dia-
gram
➭Read the measured value: red scale +/–
3.3.2 DC Current Measurement via Shunts
The accuracy of the measurement is influenced by the
measuring error of the shunt.
Operating Mode: Electrical Zero at the Left
➭Set the sliding function switch (2) to the position
➭Set the rotary range selector switch (3) to the following
position: V 100 V
➭Connect the METRAmax 2
➭Read the measured value: black scale
+

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Operating Mode: Electrical Zero at Mid-scale
➭Set the sliding function switch (2) to the position
➭Set the rotary range selector switch (3) to the following
position: 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 +/–
3.3.3 AC Current Measurement
➭Set the sliding function switch (2) to the position
➭Set the rotary range selector switch (3) to the corre-
sponding measuring range: A 3 A...100 µA
➭Connect the METRAmax 2
➭Read the measured value: black scale
3.4 End of Measurement
When no measurements are made, the sliding function
switch (2) should always be set to "0" to conserve the bat-
tery life.

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4 Characteristic Values
Measuring Ranges
Influence Quantities and Nominal Ranges of Use
Temperature
in the range 0 ... +40 ºC ±2%/10 K for
Frequency for all
measuring ranges
± 2.5 % in the range 30 Hz ... 1.5 kHz
±5 % in the range 1.5 kHz ... 3 kHz
Display
Measuring mechanism Moving-coil mechanism with core magnet
Scale mirror-backed
Scale length black scale:
87 mm in the range V, A, 0 ... 3/10
red scale: 62 mm
in the range V, A, -10/-3 ... 0 ... +3/+10
Accuracy
under reference conditions Class 2 for , class 3 for
Reference Conditions
Ambient temperature +23 ºC ±2K
Position of use horizontal
Frequency 50 ... 60 Hz
DC and AC voltage Internal resistance DC and AC voltage Voltage drop
100 mV 10 MΩ100 μA / 55 mV
300 mV 10 MΩ1mA / 55mV
1V 10MΩ10 mA / 55 mV
3V / 10MΩ1MΩ100 mA / 55 mV
10 V / 10 MΩ1MΩ1A/ 53mV
30 V / 10 MΩ1MΩ3A/ 51mV
100V / 10MΩ1MΩ
300V / 10MΩ1MΩ

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Waveshape sinusoidal
Ambient Conditions
Storage temperatures –25 ... 65 °C (without batteries)
Relative humidity
max. 75%, no condensation allowed
Power Supply
Battery 9 V flat cell battery, IEC 6 L R61
(IEC 6F22), automatic battery switch-
off after 45 minutes
Overload Protection Fuse F3,15 H/250 V per
DIN VDE 0820 part 22/EN 60127-2
protects the electrical circuits against
overload. The measuring mecha-
nism is protected by 2 diodes in
inverse-parallel connection.
Electrical Safety
Protection class II per IEC 61010-1/EN 61010-1/
VDE 0411-1
Measuring category 300 V CAT III
Nominal voltage 300 V
Contamination degree 2
Test voltage 3.7 kV∼
EMC Electromagnetic Compatibility
Interference emission/immunity EN 61326-1
Mechanical Design
Protection Housing IP50, terminals IP20
Extract from table on the meaning of
IP codes
Dimensions 100 mm x 140 mm x 35 mm
Weight approx. 0.3 kg
IP XY
(1st digit X)
Protection against
foreign object entry
IP XY
(2nd digit Y)
Protection against the
penetration of water
2≥12.5 mm dia. 0 not protected
5 dust protected 0 not protected

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5 Maintenance
5.1 Battery Replacement
When a battery test reveals that the pointer no longer trav-
els into the battery test section marked " ", the bat-
tery must be replaced. Replace the exhausted battery with
a new 9-V flat cell battery according to IEC 6 L R61
(IEC 6F 22). Remove the lower part of the case as
described in chapter 3.1.1 on page 7.
5.2 Fuse Replacement
Remove the case as described in chapter 3.1.1 on page 7.
The fuse holders are soldered to the circuit board.
5.3 Cleaning
The meter may only be cleaned with a soft cloth or brush.
Possible static charges of the glass pane can be eliminated
by means of an antistatic agent or a moist cloth.
5.4 Device Return and Environmentally Compatible Disposal
The METRAmax 2 is a category 9 product (monitoring and
control instrument) in accordance with ElektroG (German
Electrical and Electronic Device Law). This device is not
subject to the RoHS directive.
We identify our electrical and electronic devices
(as of August 2005) in accordance with WEEE
2002/96/EG and ElektroG with the symbol shown
to the right per DIN EN 50419.
These devices may not be disposed with the trash. Please
contact our service department regarding the return of old
devices, see chapter 6 on page 17.

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6 Repair and Replacement Parts Service
DKD Calibration Lab *
and Rental Instrument Service
When you need service, please contact:
GMC-I Gossen-Metrawatt GmbH
Service Center
Thomas-Mann-Strasse 16-20
90471 Nürnberg • Germany
Phone [phone]
Fax [phone]
E-Mail [email protected]
This address is only valid in Germany.
Please contact our representatives or subsidiaries for ser-
vice in other countries.
* Calibration Laboratory
for Electrical Quantities DKD–K–19701
accredited per DIN EN ISO/IEC 17025
Accredited measured quantities: direct voltage, direct current values, DC
resistance, alternating voltage, alternating current values, AC active
power, AC apparent power, DC power, capacitance and frequency
Competent Partner
GMC-I Gossen-Metrawatt GmbH is certified in accordance
with DIN EN ISO 9001:2000.
Our DKD calibration laboratory is accredited by the Phys-
ikalisch Technische Bundesanstalt (German Federal Insti-
tute of Physics and Metrology) and the Deutscher Kalibrier-
dienst (German Calibration Service) in accordance with
DIN EN ISO/IEC 17025 by under registration number
DKD–K–19701.

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We offer a complete range of expertise in the field of
metrology: from test reports and proprietary calibration certifi-
cates right on up to DKD calibration certificates.
Our spectrum of offerings is rounded out with free test
equipment management.
An on-site DKD calibration station is an integral part of our
service department. If errors are discovered during calibra-
tion, our specialized personnel are capable of completing
repairs using original replacement parts.
As a full service calibration laboratory, we can calibrate
instruments from other manufacturers as well.

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7 Product Support
When you need support, please contact:
GMC-I Gossen-Metrawatt GmbH
Product Support Hotline
Phone [phone]
Fax [phone]
E-Mail [email protected]

Edited in Germany • Subject to change without notice • A pdf version is available on the
Internet
GMC-I Gossen-Metrawatt GmbH
Thomas-Mann-Str. 16-20
90471 Nürnberg • Germany
Phone [phone]
Fax [phone]
E-Mail
[email protected]
www.gossenmetrawatt.com