Gossen MetraWatt METRA HIT 1A User manual

Operating Instructions
METRA HIT 1A/2A
Analog Multimeter 3-349-305-15
5/8.11

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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
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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

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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.

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• 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“.

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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.
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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.

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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).

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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.

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• 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.