Mastech MS2009C, User Manual, Page: 9 / 10

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Maintenance
Do not attempt to repair or perform maintenance on
the instrument without being an experienced
maintenance personnel in calibration, performance
testing, and relevant maintenance information.
Automatic Power-Off
In order to extend the battery life, the meter has an
automatic shutdown function. If there is no key
operation or function measuring range change
within 15 minutes, the meter power will disconnect
automatically. Press “SEL” button to return the
meter to the working state again.
To clean input jacks:
1. Turn off power to the instrument and remove test
leads from the input jacks.
2. Brush off all dirt from input jacks
3. With a clean cotton swab, use a cleaner or
lubricant (ex. WD-40) to clean input jacks.
4. Use a new swab for each jack to avoid cross
contamination.
Replacing The Batteries
WARNING
To avoid electric shock, make sure that the test
leads have been clearly move away from the
circuit under measurement before opening the
battery cover of the meter.
WARNING
Do not
m
ix
o
ld
a
nd
n
ew
b
atteries.
D
o
n
ot
m
ix
a
lkaline,
s
tandard (
c
arbon-
z
inc),
o
r
r
echargeable
(
n
i-
c
ad,
n
i-
m
h,
e
tc)
b
atteries.
Duty Cycle
Temperature