At the same time, the lights at the “10A” and “COM”
jacks will flash to remind the user to plug in the test
leads there.
4.1.4 At dB and Lux range, whether the test leads are
plugged in or otherwise, the meter will make no
response because no signal input is required from the
input terminals.
4.2 HOLDING READINGS
1）Press the “HOLD/B.L” button to hold the readings while
taking measurement, and the value on the display will
be held.
2）Press the “HOLD/B.L” button again to release the
READING HOLD function.
4.3 SWITCHING FUNCTIONS
1）Press the " SELECT " button to switch between AC and
DC measurement at the current and voltage ranges.
2 ） Press the " SELECT " button to switch among
resistance, diode and continuity ranges.
4.4 SWITCHING RANGES
1）When the meter is turned on, it is at the auto range
mode for measuring current, voltage and resistance.
2）Press the "RANGE" button for manual range mode.
The range will go up one level at each press and return
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to the lowest level when the highest level is reached.
3）Press the "RANGE" button for two or more seconds to
return to the auto range.
4.5 SWITCHING BETWEEN FREQUENCY/DUTY
1）Press the “Hz/DUTY” button at the frequency range to
switch between frequency and duty measurement.
2）When the meter is at the voltage and current ranges,
press the “Hz/DUTY” button to measure the frequency
of the voltage or current signal. Another press on the
“Hz/DUTY” button will change into the Duty range for
measuring the duty cycle of the voltage or current
signal.
3）Press the “Hz/DUTY” again to resume the meter to
voltage and current measurement at the manual range
mode.
4.6 SWITCHING TO RELATIVE MEASUREMENT
1 ） Press the “REL” button to enter the relative
measurement mode when taking measurements.
The initial reading will resume zero.
2）At the relative measurement mode, the existing reading
will be stored in the memory as reference value for later
measurements. The displayed reading is the difference
between the input value and reference value. i.e.
REL (present reading) = input value - reference value
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DIGITAL MULTIMETER
OPERATING INSTRUCTION
3）The meter will enter the manual range mode after the
“REL” button is pressed. REL mode is not available
for Hz/Duty range because it is an automatic range.
4) Press the “REL” button again to cancel the relative
measurement function.
5）Pressing the “REL” button at the HOLD mode will
cancel the HOLD function. The actual measurement
value taken will be stored in the memory as reference
value. The readings displayed for measurements
taken afterwards will be the difference between the
input value and the reference value.
6）Press the “RANGE”, “SELECT” buttons or turning the
rotary selector to cancel the relative measurement
function and resume normal measurement. The REL
symbol on the display will disappear.
7）OL triggering: Under the REL mode, OL (over limit) will
flash on the display if the input value exceeds the
allowed value for that range. Press the “REL” button
again to cancel the relative measurement function.
The REL mode cannot be entered when OL is flashing.
4.7 BACK LIGHT
1） Press the ”HOLD/B.L” button for two or more seconds
to switch on the back light if the light in the
environment is too dim for taking reading,.
2）Press the “HOLD/B.L” button for two or more seconds
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OPERAT INSTRUCTIONING
again to switch off the back light.
3 ） The back light will go off automatically after 10
seconds.
NOTE:
1) LED, which requires a larger working current, is the
main source of back light. Although the meter is
equipped with a timer set at 10 seconds (i.e. the back
light will be off automatically after 10 seconds),
frequent use of the back light will shorten the life of the
batteries. Therefore, do not use the back light unless
necessary.
2) When the battery voltage is ≤3.6V, the symbol “ ”
（battery low）will appear on the LCD. When the
back light is on, even if the batter is ≥3.6V, the “ ”
may appear because of its large working current which
will cause the voltage to drop. (The accuracy of the
measurement cannot be assured when the
“ “ symbol appears.) In this case, you need not
replace the batteries yet. Normally, the batteries can
last until the “ ” appears when the back light is not
being used.
4.8 AUTO POWER OFF
1）If there is no any operation within any thirty minute
period after the power is on, the meter will enter the
auto power off mode.
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