Household Batteries; Dc Milliamp Measurement; Common Dc Milliamperage Measurements; Ac Voltage Measurement - Gardner Bender GMT-12A Manuel D'utilisation

4.3 Household Batteries

Set the function/range switch to 10V DC to test household 1.5
volt through 9 volt batteries. Touch the red (+) test lead to the
(+) terminal and the black (-) test lead to the (-) terminal of the
battery. Read the 0-10 scale to determine the condition of
the battery.

5. DC Milliamp Measurement

1) Fully seat the test leads in the correct input jacks.
2) Set the function/range switch to the 250 DCmA setting.
3) Put the test leads in series with the circuit (in line with the
circuit) so that the circuit current passes through the
multimeter in order to make the measurement. If the needle
indicator deflects to the left, reverse the test leads. Read
the measurement on the 0-250 scale.

Common DC Milliamperage Measurements

It is important to point out that milliamps can also be
expressed as thousandths of an Ampere; therefore 250
milliamps is 250 thousandths of one Amp. The 250mA
function of your multimeter is commonly used by electronics
repair technicians and hobbyists to troubleshoot various low
voltage circuits. Although not normally used for electrical
troubleshooting around the home, this function can be used to
measure the milliamperage draw of household items such as
flashlights, and other battery operated devices that do not
draw more than 250 mA. In fig. 4 the red (+) test lead is
hooked up to the (+) terminal of the lantern battery while the
black (-) test lead is hooked up to the bulb. The meter will
indicate the milliamperage draw when the flashlight switch is
thrown in the ON position.
Figure 4
9
WARNING
!
Do not apply voltage to the test leads
while the meter is set in the milliamp range. See #8
For Your Safety.

6. AC Voltage Measurement

1) Fully seat the test leads in the correct input jacks.
2) Set the function/range switch to the appropriate AC voltage
range. If the voltage is unknown, use the highest range. If
the voltage applied falls within the range of a lower setting,
reset the function/range switch to the appropriate setting for
greater accuracy.
3) Touch the test leads to the circuit under test. With AC
voltage, the polarity of the test leads is not a factor.
Use the chart below as a guide to reading AC
voltage measurements:
AC V
range
setting
10
50
250
500
Common AC Voltage Measurements

6.1 Wall Receptacles

If the receptacle is controlled by a switch, make sure the
switch is ON. Set the function/range switch to 250V AC.
Touch the test leads to the "hot" and "neutral" slots of the
receptacle (see fig. 5A). The needle indicator should read
120V AC on the 0-250 scale. To test for proper grounding of
the receptacle, touch one test lead to the "hot" (narrow) side of
the receptacle, and the other test lead to the ground slot. The
meter should read 120V AC as before. To test for proper
grounding of non-polarized receptacles (fig.6), alternately
touch the test leads between the receptacle slots and the wall
plate screw. The meter should indicate 120V AC when one
test lead contacts the "hot" side of the receptacle. If ground
Read and
following multiply
scale reading by:
0-10 1
0-50 1
0-250 1
0-50 10
10