2) Use extreme care when measuring voltage above 50V, especially from sources where high
energy is existed.
3) Avoid making connections to "live" circuits whenever possible.
4) When making current measurements ensure that the circuit not "live" before opening it in order
to connect the test leads.
5) Before making resistance measurements or diode test, ensure that the circuit under test is
de -- energized.
6) Always ensure that the correct function and range is selected. If in doubt about the correct
range to use, start with the highest and work downwards.
7) Extreme care should be taken when using the instrument to conjunction with a current
transformer connected to the terminals if an open circuit occurs.
8) Ensure that the test leads and probes are in good condition with no damage to the insulation.
9) Take care not to exceed the over-load limits as given in the specifications.
10) Before opening the case of the instrument to replace battery or fuse, disconnect the test leads
from any external circuit, set the selector switch to "OFF" position.
2.1Function Press Button
1) SELECT (State choice)
There are several functions at one rotary switch position, press SELECT button to select
function you want, It allowable to select AC or DC current, Resistance or Diode, Audible
continuity , capacitance measurement, ℃or temperature measurement℉.
2) RANGE (Range selection)
When power on, meter at auto range mode, press RANGE button you can select measurement
range you want. Range is run up with times of pressing RANGE button until its max, then return
the min range. Press RANGE button more than 2 seconds , the meter return to auto range. This
button do not effect on frequency, duty cycle, capacitance, diode & continuity test and
temperature measurement.
3) (Relative Measurement / RS232 enable)
Press this button the meter enter relative measuring state and “Δ” symbol appear on LCD.
The result of the relative measurement is the difference between measuring value and
reference value. The reference value is produced same as momentary reading value when
pressing this button, press it again to exit this state and “Δ” symbol disappear on display, and
this button do not effect on frequency, diode and continuity test function. Press this button less
than 2 seconds the meter enter relative measuring state and “Δ” symbol appear on LCD. The
secondary function of button is RS232 communication enable and disable. If you
press it more than 2 seconds, the RS232 will be started and press it more than 2 seconds again
will cancel RS232 communication.
4) (Data Hold / Backlight)
Press this button less than 2 seconds the meter enter data hold mode and “ HOLD ” symbol
appear on LCD, and the momentary value while pressing the button display on LCD. Press it
again to exit this mode and “ HOLD ” symbol disappear on display. As data hold function,
this button do not effect on diode and continuity test function. The secondary function of
button is backlight enable and disable. If you press it more than 2 seconds, the backlight will be
turn on and press it more than 2 seconds again will make the backlight off.
5) Hz/DUTY (Frequency and Duty Cycle measurement switch button)
When you make frequency, AC voltage or AC current measurement, press this button to
switch Hz or duty cycle test mode.
6) MAX/MIN (Maximum value / Minimum value)
Press MAX/MIN button the meter enter Maximum value / Minimum value record mode and
“ MAX ” / ” MIN ” symbol appear on LCD, the LCD will display the maximum value or minimum
value science pressing the button always. Press MAX/MIN more than 2 seconds button again to
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