Gardner Bender GMT-319 7 Function Analog Multimeter User Manual
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voltage applied falls within the range of a
lower setting, reset the function/range switch
to the appropriate setting for greater accuracy.
3) If the polarity of the circuit to be tested is
known, touch the black test lead to the
neutral side. If the polarity is unknown, touch
the test leads to opposite sides of the circuit.
If the needle indicator deflects to the left of
the scale, reverse the test leads.
Use the chart below as a guide to reading DC
voltage measurements:
DC V
Read and
range following
multiply
setting scale
reading by:
2.5 0-250
Divide reading by 100
10 0-10
1
50 0-50
1
250 0-250 1
1000 10
100
4.1 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, (-) black lead, (+) red lead.
2) Set the function/range switch to the
appropriate DCmA setting.
3) Touch the test leads to the circuit in series (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.
DC mA
Read and
range following
multiply
setting scale
reading by:
5 0-50 0.1
50 0-50
1
500 0-50
10
DC 10Amp Measurement
A separate input jack is provided for measurement
of DC current up to 10 Amps. Additionally, this
function is designed for intermittent use only.
Maximum contact of the test leads with the
circuit is 15 seconds, with a minimum
intermission time of 30 seconds between tests.
Set the function/range switch to the 10A range.
Touch the test leads to the circuit in the same
manner as instructed in DC MILLIAMPERAGE
MEASUREMENT. Read the 0-10 scale.
Common DC Milliamperage
Measurements
It is important to point out that milliamps can also
be expressed as thousandths of an Ampere;
therefore 500 milliamps is 500 thousandths of
one Amp. The 500mA function of your
multimeter is commonly used by electronics
repair technicians and hobbyists to troubleshoot
various low voltage circuits. Although not normally
Figure 2
GMT-319 manual 7.08.qxp 7/2/08 3:50 PM Page 10