Specifications; Important; For Your Safety; Operating Suggestions - Gardner Bender GMT-12A Manuel D'utilisation

2. Specifications

Ranges: 12 measuring ranges
DC Voltage: 10-50-250-500 Volts
AC Voltage: 10-50-250-500 Volts
DC Current (Milliamperes): 0.5-50-250mA
Resistance (Ohms): Rx1K (resistance indicated multiplied by 1000)
1 Megohm max
Decibels: -20dB to +56dB on AC voltage ranges
Accuracy: DC voltage, mA = 4% full scale of range
AC voltage = 5% full scale of range
Resistance = 4° arc of scale length
Sensitivity: 2000 ohms per volt DC and AC
Function/Range Switch: 5 functions
13 positions
12 measuring ranges
Zero Ohms Adjustment Dial: Located on the left side of the housing; adjustment
dial is used to zero the needle indicator on the
ohms scale while shorting the test leads together.
Mechanical Zero
Adjustment Screw: Located directly below the center of the meter
scale; adjust needle indicator to read zero
at the left side of the scale before taking
any measurement.
Mirrored Scale Plate: The mirror on the scale plate is used to line up the
needle with its reflection to improve the reading
accuracy by preventing parallax error.
Recessed Input Jacks: Negative (-) input jack for black test lead, positive
(+) input jack for red test lead.

Important:

Read this operators manual thoroughly before using this
multimeter. This manual is intended to provide basic
information regarding this multimeter and to describe
common test procedures which can be made with this unit.
Many types of appliance, machinery and other electrical
circuit measurements are not addressed in this manual
and should be handled by experienced service technicians.
! WARNING
Use extreme caution when using this
multimeter. Improper use of this meter can result in
severe damage to property, severe personal injury or
death. Follow all instructions and suggestions in this
operators manual as well as normal electrical safety
precautions. Do not use this multimeter if you are
unfamiliar with electrical circuits and proper
test procedures.
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2.1 For Your Safety

1) Use extreme caution when checking electrical circuits.
! WARNING
2) Do not stand in wet or damp work areas when
working with electricity. Wear rubber-soled boots or shoes.
! WARNING
3) Do not apply more voltage or current than
the set range of the multimeter will allow.
WARNING
!
4) Do not touch the metal probes of the test
leads when making a measurement.
5) Replace worn test leads. Do not use test leads with broken
or tattered insulation.
6) Discharge a capacitor before measuring it.
7) Remove the test leads from the circuit being measured as
soon as the test is completed.
WARNING
!
8) Do not measure voltage when the
function/range switch is set on the resistance (ohms) or the
current (mA) settings. Never measure current when the meter
is set on the resistance range. Never measure AC voltage
when the meter is set on DC voltage or DCmA. Setting the
meter on the incorrect function may burn out some of the
internal circuitry and may pose a safety hazard.

3. Operating Suggestions

1) Set the function/range switch to the proper position before
making a measurement. When the voltage or current is not
known, it MUST be determined that the capacity of the
selected range will handle the amount of voltage or current
in the circuit (see #3 under For Your Safety). Always start
with the highest range in the function. If the reading falls
within the range of a lower setting, reset the function/range
switch to the appropriate setting for greater accuracy.
2) Avoid placing the meter in areas where vibration, dust or dirt
are present. Do not store the meter in excessively hot,
humid or damp places. This meter is a sensitive measuring
device and should be treated with the same regard as other
electrical and electronic devices.
3) Using the meter in areas with high magnetic fields can result
in inaccurate readings. For greatest accuracy, lay the meter
flat on a non-metallic surface.
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