Mastech MS8218, Instruction Manual

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MS8218 True RMS Multimeter
Maintenance
Chapter 5 Maintenance
Replacement of Batteries
If symbol appears on the LCD screen during measurement, it indicates the total voltage of batteries being lower
than 6.8V. For ensuring measurement accuracy, it is necessary to replace the batteries. Before the replacement, must take off
the red and black testing lines from the measured circuit and turn off the power of the meter. Open the cover of the batteries on
the back of the meter and take out all the old batteries, replacing them with the 7# batteries. Take care to put in the batteries as
the polarity specified on the shell of the meter. The meter must not be used until the cover of batteries being put properly and
locked in. When opening the cover of the batteries, should rotate the two plastic bolts for 90
°
according to the direction of
clock hand, while closing the cover, should do for 90
°
according to the opposite direction of clock hand. Rotation more than
90
°
may damage the plastic bolts.
Replacement of Fuse
It must take off the red and black testing lines from the measured circuit and turn off the power of the meter before replacement
of fuse. It should only use fuse of the same model and the same electric specifications. Two fuses must not be put wrong in
positions during their replacement. And the meter must not be used until the cover of fuses being put properly and locked in.
Notes: generally, fuses will not be blown under the normal use of the meter. In case of blowing it is necessary first to find out
the reasons for the blowing and then take an account on the use of the meter. Generally, blowing may attribute to:
●
Perform voltage measurement when the rotary switch being in the position of current.
●
Current exceeds range.
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