Instruction Manuals. Gardner Bender product instruction manuals provide complete information on the operation of Gardner Bender products. Gardner Bender offers replacement instruction manuals for most models as free downloads. Quick instructions on how to use the Gardner Bender GDT-11 digital multimeter, a handheld unit that measures electrical resistance, current and voltage.
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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
Read
and
range
following
multiply
setting
scale
reading by:
10
0-10
1
50
0-50
1
250
0-250
1
500
0-50
10
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. 3A). 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.
7. Resistance/Continuity Measurement
For resistance and continuity testing POWER
MUST BE OFF:
1) Fully seat the test leads in the input jacks (-)
black lead, (+) red lead.
2) Set the function/range switch to the desired
position and short the test leads together. Using
the zero ohms adjustment dial, slowly turn the
dial until the needle indicator reads -0- ohms at
the right end of the ohms scale. If the needle will
not zero, replace the internal battery with a new
1.5 volt AA size non-rechargeable battery (see
Battery Replacement).
3) Touch the test leads to the resistance or non-
energized circuit to be measured. Measure the
value of the reading on the green ohms scale
and multiply the reading by 1/10/100. If you’re
making basic continuity tests, the needle
indicator should move all the way to the right
side of the ohms scale if continuity exists.
Note: When switching the unit back and forth
from ohms to other functions, always zero the
needle indicator before taking another reading.
Failure to zero the needle before taking
resistance/continuity measurements will result in
inaccurate readings.
Continuity tests are probably the most frequently
performed electrical troubleshooting procedures
around the home. ALWAYS REMEMBER THAT
CONTINUITY CHECKS ARE TO BE MADE
WITH THE POWER TO THE CIRCUIT
Figure 3
3A
3B
GMT-318 6-09 manual.qxp 6/8/09 2:03 PM Page 12
Gardner Bender’s GDT-11 is a handheld digital multimeter with a 3 1/2-digit liquid crystal numeric display. The meter measures volts for direct and alternating currents, resistance and DC current. In addition, the unit has a diode check feature.
Snap the battery clip onto one of the batteries; set the battery aside for measuring voltage and current.
Plug the red test probe into the meter socket marked VΩmA.
Plug the black test probe into the meter socket marked COM.
Rotate the function selector knob to any setting other than OFF. If the display does not turn on, or if you see the BAT indicator on the display, replace the meter’s internal 9-volt battery with a fresh one.
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Measurements of a 9-volt battery are safe as the voltage is too low to pose a shock hazard.
Rotate the function selector knob until it points to the 20 range in the DC voltage scale, indicating a maximum of 20 volts. The DC voltage scale is indicated by the V-- symbol on the meter.
Touch the metal tip of the red meter probe to the positive wire of the battery clip; usually this is the red wire. Touch the tip of the black probe to the negative wire, which is black.
Read the voltage indicated on the meter’s LCD display. The meter should measure roughly 9 volts.
You can measure voltage or current with the probe polarity reversed; however, the meter will display a negative number. This does not adversely affect the meter or the components you’re testing.
Avoid touching the metal probe tips when measuring voltages greater that 50V; high voltages pose a shock hazard.
Rotate the function selector knob until it points to the 200 range on the meter’s resistance scale, indicated by the Ω symbol.
Touch the red meter probe tip to one of the resistor’s leads. Touch the black probe to the remaining resistor lead.
Read the resistance on the meter’s display. You should see a reading of about 100 ohms; a few percent higher or lower is normal.
Wrap the positive battery clip wire around one of the leads of the resistor.
Rotate the function selector knob until it points to the 200 range in the meter’s DC current scale, indicated by the A-- symbol.
Touch the tip of the red meter probe to the free lead of the resistor. Touch the tip of the black meter probe to the negative battery clip wire.
Read the current value on the meter’s display. You should see a reading of about 90 milliamps or .09 amps.
Do not attempt to measure currents in excess of 200 milliamps unless the red meter probe is plugged into the 10A DC socket and the selector knob points to the 10A-- range.
Always measure current with a resistance connected in series with a battery or other power source; the resistance limits the current and avoids a potentially damaging short circuit.