Gossen MetraWatt M192A User manual

METRALINE DM 41
Digital Multimeter 3-447-024-03
2/3.21
Operating Instructions

2 Gossen Metrawatt GmbH
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Multimeter Operating Elements
1LCDdisplay
2 Multifunction pushbutton (yellow)
3 Pushbutton for relative value
4 Pushbutton for automatic or manual range selection
5 Hz/% pushbutton for V AC & V DC
6 Pushbutton for Data HOLD function
7 Pushbutton for backlight function (optional)
8 Function selector switch for ON/OFF and measurement
function
9 Terminal sockets
LCD Display
1 Digital display with indication of decimal point and polarity
2 Display of selected current/voltage type
3 Display for automatic measuring range selection
4 REL, HOLD display
5 Continuity test display: buzzer indication
6 Diode measurement display
7 Low battery display
8 Display for unit of measured quantity
Standard Equipment
1Multimeter
1 Protective rubber cover
1Cableset
2 Batteries, 1.5 V, type AA, installed
1 Operating instructions

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Contents Page
1 Safety Features and Safety Precautions ....................................6
2 Initial Start-Up ............................................................................9
3 Function and Range Selection .................................................10
3.1 Measuring Function Selection ..................................................................10
3.2 Automatic Measuring Range Selection .....................................................10
3.3 Manual Measuring Range Selection .........................................................10
4 Liquid Crystal Display (LCD) .....................................................11
4.1 Digital Display .........................................................................................11
4.2 Display with Backlight (Optional) ..............................................................11
5 Buzzer ......................................................................................12
6 Measurement Value Storage „HOLD“ ......................................12
7 REL – Relative Value Measurement .........................................12
8 Voltage Measurement ..............................................................13
9 Current Measurement ..............................................................14
9.1 AC Current Measurement with (Clip-on) Current Transformer ....................15
9.1.1 Transformer Output mA/A .......................................................................15
9.1.2 Transformer Output mV/A .......................................................................16
10 Diode Testing and Continuity Measurement ............................17
10.1 Diode Testing .........................................................................................17
10.2 Continuity Testing ...................................................................................18
11 Resistance Measurement ........................................................19
12
Capacitance Measurement ................................................................. 20
13 Frequency and Duty Cycle Measurement ................................22
13.1 Frequency Measurement .........................................................................22
13.2 Duty Cycle Measurement ........................................................................22
14 Temperature Measurement .....................................................23

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15 Technical Characteristics .......................................................24
16 Maintenance ............................................................................30
16.1 Battery ...................................................................................................30
16.2 Fuses .....................................................................................................32
16.3 Housing ..................................................................................................33
16.4 Returns and Environmentally Sound Disposal ............................................34
17 Product Support .......................................................................35
18 Repair and Replacement Parts Service
Calibration Center* and Rental Instrument Service ................. 35
19 Manufacturer‘s Warranty ......................................................... 36
20 Registration .............................................................................36

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1 Safety Features and Safety Precautions
You have selected an instrument which provides you with a
high level of safety.
The digital multimeter is manufactured in compliance with
safety regulations. In case of incorrect use or careless han-
dling, the safety of both user and multimeter is not assured.
To maintain the safe and proper condition of the multimeters and to
ensure their safe operation, it is absolutely necessary to carefully and
completely read these operating instructions before using any multi-
meter. These instructions must be followed in all respects.
Please observe the following safety precautions
• The multimeter must only be operated by persons who
understand the danger of shock hazards and know how to
apply safety precautions. Shock hazards exist anywhere,
where voltages of more than 30 V (TRMS) may occur.
• Do not work alone in shock hazardous environment while
carrying out measurement
• The maximum allowable voltage between any terminal
sockets (1) and earth is equal to 600 V. Voltages of greater
than 500 V may only be applied to sockets „ “ and „V“
with the selector switch in the voltage measurement posi-
tion (selector switch in „V“ position).
• Take into account that unexpected voltages can occur at
devices under test (e.g. defective devices), for example,
capacitors can be dangerously charged.
• Verify that the test leads are in good condition, e.g. no
cracked insulation, no open circuits in the leads or connec-
tors.
• This multimeter must not be used for measurements on
circuits with corona discharge (high voltage).
• Be particularly careful when measurements are performed in
HF electrical circuits. Dangerous composite voltages may be
present.

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• Measurements under moist ambient conditions are not
permitted.
• Do not exceed the permissible overload limits of the mea-
suring ranges. Limit values can be found in the table „Mea-
suring Ranges“ in chapter 15 „Technical Characteristics“.
• All current ranges are equipped with fuses. The maximum
allowable voltage for the measuring current circuit is equal
to 600 V~.
• The instrument may only be used in power installations when the
electrical circuit is protected with a 20 A fuse or circuit breaker,
and the nominal voltage of the installation does not exceed 600 V.
Meaning of the symbols on the device
Warning concerning a source of danger
(Attention, refer to the operating instructions)
Earth (ground) terminal.
Double or reinforced insulation
CAT II / III / IV Instrument for measuring category II / III or IV
EU conformity mark

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Opening of Equipment / Repair
The equipment may be opened only by authorized service per-
sonnel to ensure the safe and correct operation of the equip-
ment and to keep the warranty valid.
Even original spare parts may be installed only by authorized
service personnel.
In case the equipment was opened by unauthorized person-
nel, no warranty regarding personal safety, measurement
accuracy, conformity with applicable safety measures or any
consequential damage is granted by the manufacturer.
Repair and Parts Replacement by Authorized Service Personnel
After opening the multimeter, live parts may be exposed.
Therefore, the multimeter must be disconnected from the mea-
suring circuit prior to opening its housing for repair, replace-
ment of parts or calibration. If repair or calibration cannot be
avoided unless the multimeter is open and live, this work must
be performed by a qualified person who understands the dan-
gers involved.
Faults and Extraordinary Stress:
If it has been ascertained that safe operation is no longer pos-
sible, take the multimeter out of service and secure it against
accidental use. Safe operation may not be possible
• if the multimeter shows obvious signs of damage,
• if the multimeter no longer functions correctly,
• after prolonged storage under adverse conditions,
• on account of severe stress during transport.

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2 Initial Start-Up
Batteries
Please refer to chapter 16.1 on page 30 before initial start-up
of your instrument or after a lengthy period of storage.
Switching the Multimeter ON
Turn the function selector switch from the OFF position to the
desired measuring function.
All segments of the LCD are activated briefly.
A drawing of the LCD can be found on page 2.
Note!
Electric discharge and high-frequency interference may
cause incorrect displays and block the measuring
sequence. Reset the multimeter by switching it OFF and
ON again. If this procedure is unsuccessful, briefly dis-
connect the battery from the contact terminals.
Attention!
!
Before opening, disconnect the multimeter from the measur-
ing circuit and observe chapter 16 on page 30.
Automatic Meter-OFF (MoFF)
Your multimeter switches OFF automatically after 15 minutes if
no keys or the function selector switch have been activated
during this time.
Switching the multimeter back ON
Activate the HOLD key.
Switching the multimeter OFF
Turn the function selector switch to the OFF position.

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3 Function and Range Selection
3.1 Measuring Function Selection
The desired measuring function is selected with the function
selector switch (white or green print). In order to select the
function printed in green color, the yellow multifunction key
must also be pressed. If the multifunction key is pressed again,
the function printed in white half circle is reactivated.
3.2 Automatic Measuring Range Selection
These multimeters features auto-ranging for all measuring
ranges except for the ranges 400 mV~ and 10 A. Automatic
selection is functional as soon as the multimeter is switched
ON. According to the measured quantity applied, the multime-
ter automatically selects the measuring range which gives the
best resolution.
3.3 Manual Measuring Range Selection
You can switch OFF auto-ranging. Select and fix the ranges
manually according to the table given on page 11.
First select the desired measuring function with the function
selector switch and, if appropriate, the multifunction key.
Briefly activate the AUTO/MAN key.
Manual mode is switched OFF if you press and hold the AUTO/
MAN key until you hear a second acoustic signal, and the dis-
play switches to AUTO.
When switching back to automatic operation in the 400 mV~
range, the 4 V~range is activated.
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