Mastech MS8228, Operation Manual, Page: 16 / 26

DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
NOTE: NOTE: NOTE: NOTE:
1) The laser pointer requires a larger working current.
Frequent use of laser beam will shorten the life of the
batteries. Therefore laser beam should not be used
unless necessary.
2) When the battery voltage is ≤3.6V, the symbol “ ”
（
battery low
）
will appear on the LCD. When laser
beam is being used, 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 laser beam is not
being used.
4.9 4.9 4.9 4.9 AUTO AUTO AUTO AUTO POWER POWER POWER POWER OFF OFF OFF 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.
2
）
Turn the rotary selector or press any of the
“HOLD/B.L”, “SELECT”, “RANGE”, “Hz/DUTY” or
“REL” button to resume operation of the meter under
auto the power off mode.
3
）
Press the “SELECT” button to disable the auto power
off function.
- 28 -
DIGITAL MULTIMETER
OPERATING INSTRUCTION NTS
4. 4. 4. 4.10 10 10 10 PREPARATI PREPARATI PREPARATI PREPARATING NG NG NG FOR FOR FOR FOR MEASUREMENT MEASUREMENT MEASUREMENT MEASUREMENT
4.10.1 Switch on the power by turning the rotary selector. If
the battery voltage is lower than 3.6V, the “ ”
symbol will appear and the batteries should be
replaced.
4.10.2 The “ ” symbol beside the input lead shows that
the input voltage or current should not exceed the
specified value in order to protect the internal circuit
from damage.
4.10.3 Turn the rotary selector to the required function and
range to be measured. Under the manual mode,
choose the highest range when the value scale to be
measured is unknown.
4.10.4 Connect the common test lead first and then the
charged test lead when making connection. Take away
the charged test lead first when disconnecting.
4. 4. 4. 4.11 11 11 11 MEASURING MEASURING MEASURING MEASURING RELATIVE HUMIDITY HUMIDITY HUMIDITY HUMIDITY
4.11.1 This function is used for measuring the ambient
humidity around the meter.
4.11.2 Turn the rotary selector away from the OFF position.
4.11.3 The current ambient humidity will be shown on the
humidity display of the LCD.
NOTE: NOTE: NOTE: NOTE:
1
）
The humidity sensor is placed inside the front part of the
meter and therefore it may take a longer time to reach
- 29 -