Operating instructions
GO
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METRAW
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METRAmax 2
Analog multimeter
3-348-734-02
3/3.97
2 GOSSEN-METRAWATT
Contents
Page
1 Safety features and safety precautions ....................4
2 Description ................................................................ 5
3 Operation ...................................................................6
3.1 Operating controls .............................................................. 6
3.2 Getting started .................................................................... 6
3.2.1 Connecting the battery ..........................................................6
3.2.2 Checking the mechanical zero ...............................................7
3.2.3 Checking the electrical zero ................................................... 7
3.2.4 Battery test ........................................................................... 7
3.3 Voltage measurement .........................................................8
3.3.1 DC voltage measurement ...................................................... 8
3.3.2 Direct AC voltage measurement up to 300 V .......................... 8
3.3.3 AC voltage measurement with superimposed
DC voltage component ..........................................................9
3.4 Current measurement .......................................................10
3.4.1 Direct DC current measurement ........................................... 10
3.4.2 DC current measurement via shunts ....................................10
3.4.3 AC current measurement .................................................... 11
3.5 End of measurement ........................................................11
4 Specifications ..........................................................12
5 Maintenance ........................................................... 14
5.1 Battery replacement .........................................................14
5.2 Fuse replacement ............................................................. 14
5.3 Cleaning ............................................................................14
6 Repair and replacement parts service ....................15
GOSSEN-METRAWATT 3
1 Safety features and safety precautions
The analog multimet er MET RAmax 2 is cons tructe d in comp lianc e
with the safety rules of IEC 1010-1/EN 61010-1/VDE 0411-1.
When properly used, the safety of both the user and the meter is
assured. Their safety is not assured, however, if the meter is misused or careles s ly ha n d le d. Th a t is why it is absolutel y n ec es sary
to carefully and completely read these operating instructions before
using the METRAmax 2 and to follow them in all respects.
Please note the following safety precautions:
• The meter must only be operated by persones who understand the danger of shock hazards and know how to apply safety precautions.
• Shock hazards exist wherever voltages of more than 30 V (RMS value)
to ground can appear.
• It must be taken into account that unexpected voltages can appear on
devices under test (e.g. defective devices).
Capacitors may be charged dangerously, for instance!
• Case and test leads must be in good condition, e. g. no cra cks or broken
spots.
• The METRAmax 2 must not be used for measurements on circuits with
corona discharge (high voltage!).
• Be particularly careful when measuring on HF circuits.
Dangerous composite voltages may exist there.
• Measurements under moist environmental conditions are not permitted. Hands, shoes, floor and working site must be dry.
• Absolutely verify that overloading of the measuring ranges does not
exceed the permissible limits.
4 GOSSEN-METRAWATT
2 Description
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 bearings of
the stray-field-insensiti ve moving-c oil movem ent 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 vo ltage and DC current measurements
regardless of the polarity.
The connection s o ckets are protect ed against accident al contact.
Both the special test leads with contact-pro tected connection
plugs and all test leads with commercial banana plugs (4 mm diam eter) can be use d .
The DC current meas uring ran ges can be ex panded by mean s of a
shunt (e.g. 10 A/100 mV).
The meter is of s ervice-friendly design.
GOSSEN-METRAWATT 5
3Operation
3.1 Operating controls
7
6
5
9 V
6F22
1
+
~
1 Adj ust ment sc rew for the m echani c al zer o ( 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
3.2 Getting started
3.2.1 Connecting the battery
The battery compartmen t 7 con t ains a 9-V battery (IEC 6F22)
which is not connec ted. To c onne ct the b atter y, i t is requi red t o remove the lower part of the case. For this purpose, press the nose
6 on the front of the meter inwards, using an adequate tool. Securely connect the battery contacts to the battery cl ip located in the
battery compartment. Ensure rel iable cont act maki ng. Replac e the
lower part of the case and press the two parts to gether until they
engage.
6 GOSSEN-METRAWATT
2
4
3
Caution!
Both test leads must be disconnected from the measuring circuit before opening the meter!
☞
Note
Automatic battery switch-off after 45 min. Switching off
and on again of the sliding function switch ac tivates the
power supply.
3.2.2 Checking the mechanical zero
The METRAmax 2 mus t not be conne cted when check ing 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 ab o v e the line marked "
OFF"
• Correct the deviation by means of the adjustment screw 1 on
the bottom of the case using a screwdriver, if required
3.2.3 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
3.2.4 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 section 5 Maintenance, battery replacement).
GOSSEN-METRAWATT 7
3.3 Voltage measurement
3.3.1 DC voltage measurement
Operating mode: Electrical zero at left
+
• Set the sliding function switch 2 to the position
• Set the rotary range selector switch 3 to the corresponding
measuring range: V 300 V... 100 mV
• Connect the METRAmax 2
• Read the meas u red v al ue: black scale
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 corresponding
measuring range: V 300 V ... 100 mV
• Check that the pointer rests at mid-scale, see section 3.2.3 on
page 7
• Connect the METRAmax 2
• Read the measured value: red scale +/–
3.3.2 Direct AC voltage measurement up to 300V
• Set the sliding function switch 2 to the position
• Set the rotary range selector switch 3 to the corresponding
measuring range: V 300 V... 3 V
8 GOSSEN-METRAWATT
• Connect the MET RA max 2
• Read the measured value: black scale
To keep the influence o f the freq uency as l ow as possib le, th e con-
nection socket " " should be connecte d to the ground potential
as directly as possible or to lowest point with respect to ground.
3.3.3 AC voltage measurement with superimposed
DC voltage component
The DC voltage component, s uch as occurs with an amplifier 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 measuring freque ncy of 50Hz. The
measuring procedure corresponds to the one descr ibed above.
The DC component can be determined same as with DC voltage
measurement.
To protect the meter against overload, the selected measuring
range must always be higher t h an th e D C voltage compo nent determined at first.
Caution!
Both voltage com pon ents must be t este d befo re sw it ching to a lower measu rin g r an g e .
GOSSEN-METRAWATT 9
3.4 Current measurement
For all current measurements, connect the METRAmax 2 in series
with the consumer in the line having the lower potential to ground.
3.4.1 Direct DC current measurement
Operating mode: Electrical zero at left
+
• Set the sliding function switch 2 to the position
• Set the rotary range selector switch 3 to the corresponding
measuring range: A 3 A...100 µA
• Connect the METRAmax 2
• Read the meas u red v al ue: black scale
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 corresponding
measuring range: A 3 A...100 µA
• Check that the pointer rests at mid-scale, see section 3.2.3 on
page 7
• Connect the METRAmax 2 according to the wiring diagram
• Read the measured value: red scale +/–
3.4.2 DC current measurement via shunts
The accuracy of the measurement is influenced by the meas ur ing
error of the shunt.
Operating mode: Electrical zero at left
+
10 GOSSEN-METRAWATT
• 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 MET RA max 2
• Read the measured value: back scale
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 po in ter rests at mid-sc al e, see section 3.2 . 3 o n
page 7
• Connect the MET RA max 2
• Read the measured value: red scale +/–
3.4.3 AC current measurement
• Set the sliding function switch 2 to the position
• Set the rotary range selector switch 3 to the corresponding
measuring range: A 3 A...100 µA
• Connect the MET RA max 2
• Read the measured value: black scale
3.5 End of measurement
When no measurements are made, the sliding function switch 2
should always be set to "0" to conserve the battery life.
GOSSEN-METRAWATT 11
4 Specifications
Measuring ranges
DC and AC
voltage
100 mV 10 MΩ 100 µA / 55 mV
300 mV 10 MΩ 1mA / 55mV
1V 10MΩ 10 mA / 55 mV
3V / 10MΩ 1MΩ 1A / 53mV
10 V / 10 MΩ 1MΩ 3A / 51mV
30 V / 10 MΩ 1MΩ
100 V / 10 MΩ 1MΩ
300 V / 10 MΩ 1MΩ
Infuence quantities and nominal ranges of use
Temperature
on the range 0 ... +40 ºC ± 2%/10K on
Frequency
for all measuring r anges ± 2.5 % on the 30 Hz...1.5 kHz range
Accuracy
Under reference conditi ons Class 2 for
Reference conditions
Ambient temperature +23 ºC ± 2K
Position of use Horizontal
Frequency 50 ... 60 Hz
Waveform Sinusoidal
Internal resistance DC and AC
voltage
100 mA / 55 mV
± 5 % on the 1.5 kHz ... 3 kHz range
Class 3 for
Voltage
drop
12 GOSSEN-METRAWATT
Power supply
Battery 9-V flat cell battery, IEC 6F22,
automatic battery switch-off
after 45 min.
Overload protection Fuse F3,15 H/250 V acc. to
DIN VDE 0820 part 22/EN 60127-2
protects the circuit s ag a i n s t overload. The movement is protected by
2 diodes in inverse-parallel connection.
Electrical safety
Protection class II acc. to IEC 1010-1/EN 61010-1/
VDE 0411-1
Overvoltage category CAT III
Nominal voltage 300 V
Pollution degree 2
Test voltage 3,7 kV∼
EMC Electromagnetic compatibility
Emission EN 50081-1: 1992
Immunity EN 50082-1: 1992
Mecanical configuration
Dimensions 100 mm x 140 mm x 35 mm
Weight approx. 300 g with battery
GOSSEN-METRAWATT 13
5 Maintenance
5.1 Battery replacement
When a battery test reve als t hat the pointe r no lo n g er t r av els into
the battery test section marked " ", the battery must be replaced. Replace the exhausted battery with a new 9-V flat cell battery according to IEC 6F 22. Remove th e lower pa rt of th e case as
described in section 3.2.1 on page 6.
5.2 Fuse replacement
Remove the case as described in section 3.2.1 on page 6. The fuse
holders are soldered to t he circuit board.
5.3 Cleaning
The meter must only be cleaned with a soft cloth or brush. Eventually existing static charges of the window can be eliminated by
means of an antistatic agent or a moist cloth.
14 GOSSEN-METRAWATT
6 Repair and replacement parts service
When you need service, please contact:
GOSSEN-METRAWATT GMBH
Service
Thomas-Mann-Straße 16 - 20
D - 90471 Nürnberg
Telefon (09 11) 86 02 - 4 10 / 4 11
Telefax (09 11) 86 02 - 2 53
This address if for Germany only. Abroad, our representatives or
establishments are at your disposal.
GOSSEN-METRAWATT 15
Printed in Slovenia ⋅ Subject to change without notice
GOSSEN-METRAWA TT GMBH
D – 90327 Nürnberg
Company address:
Thomas-Mann-Straße 16 – 20
D – 90471 Nürnberg
Telefon (09 11) 86 02 – 0
Telefax (09 11) 86 02 – 6 69
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