Elenco Digital Multimeter - Manual (Page 12)

• To return to the auto range setting, press and hold the
RANGE button for 2 seconds. The Auto icon will appear on
the display. You may also rotate the selector dial to another
position and back again to return to auto range.
3. Enter or exit manual range mode
• Press the RANGE button to select the manual range mode
and the Auto icon disappears. Each press of the RANGE
button increases the range. When the maximum range is
reached, the meter reverts to the lowest range.
• Press and hold the RANGE button for more than two seconds
to return to the autorange mode and the Auto icon will appear
on the display.
8. Making Measurements
Preparation
Checking the Battery Voltage
Rotate the Function Rotary Switch to any position away from the OFF
position. The battery voltage is adequate when the indication is clear
and the “ ” symbol is not on the display.
If the “ ” symbol appears on the display, or nothing shows on the
display at all, follow the battery replacement procedure shown in
related items in this manual and replace with new batteries specified.
Measuring Voltage
Voltage is the difference in electrical potential between two points.
The polarity of AC (alternating current) voltage varies over time, while
the polarity of DC (direct current) voltage is constant.
Danger
To avoid the danger of electric shock, never make
measurements on a circuit over 600V AC/DC (electrical
potential to ground 300V DC/AC). Do not operate the
Function Rotary Switch during measurement. Do not make
a measurement when opening the battery cover and the
meter case.
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Keep the following in mind while doing a continuity test:
• Even with the test leads shorted, the indicated value may not be
“0”. This is because of the resistance of the test leads and not a
fault. If necessary, you can press the
REL Δ button to
automatically subtract its value, then “0” will be indicated.
Measuring Capacitance
Caution
To avoid possible damage to the meter or to the equipment under
test, disconnect the circuit power and discharge all high-voltage
capacitors before measuring capacitance. Use the DC voltage
function to confirm that the capacitor is indeed discharged.
Capacitance is the ability of a component to store an electrical
charge. The unit of capacitance is the farad (F). Most capacitors are
in the nanofarad (nF) to microfarad (
μ F) range.
The meter measures capacitance by charging the capacitor with a
known current for a known period of time according to the
measuring capacitance:
Measuring capacitance <4 μ F Measuring time is about 2 seconds
Measuring capacitance <40 μ F Measuring time is about 7 seconds
Measuring capacitance <100 μ F Measuring time is about 30 seconds
To measure capacitance, proceed as follows:
1. Turn on the meter, then set up the meter as shown in Figure 13.
2. Insert the black test lead into the COM terminal and the red test
lead into the terminal.
3. Set the Function Rotary Switch to the ) position (then, “AUTO”
and “nF” symbols are indicated on the display).
4. Connect the test leads to both ends of the capacitor under test,
then the measured value is shown on the display. If the capacitor
is polarized, connect the red test lead to the positive lead and the
black test lead to the negative lead.
The following are some tips for measuring capacitance:
• To improve the measurement accuracy of small value
capacitors, press the REL Δ button with the test leads open
to subtract the residual capacitance of the meter and leads.
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