MD 9040 & MD 9050 Digital multimeter
Maintenance
17
5 Maintenance
WARNING
To avoid electrical shock, disconnect the meter from any circuit, remove the test leads
from the input jacks and turn OFF the meter before opening the case. Do not operate
with open case. Install only the same type of fuse or equivalent
Cleaning and Storage
Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives
or solvents. If the meter is not to be used for periods of longer than 60 days, remove the
battery and store it separately
Trouble Shooting
If the instrument fails to operate, check battery, fuses, leads, etc., and replace as
necessary. Double check operating procedure as described in this user’s manual
If the instrument voltage-resistance input terminal has subjected to high voltage
transient (caused by lightning or switching surge to the system) by accident or abnormal
conditions of operation, the series fusible resistors will be blown off (become high
impedance) like fuses to protect the user and the instrument. Most measuring functions
through this terminal will then be open circuit. The series fusible resistors and the spark
gaps should then be replaced by qualified technician. Refer to the LIMITED
WARRANTY section for obtaining warranty or repairing service.
Battery and Fuse replacement
Battery use:
Single 9V battery; NEDA1604G, JIS006P IEC6F22, NEDA1604A,
JIS6AM6 or IEC6LF22
Fuses use:
MD 9040 and 9050:
Fuse (FS1) for
AmA current input: 1A/600Vac, IR 100kA, F fuse;
Fuse (FS2) for A current input: 10A/600Vac, IR 100kA, F fuse
Battery replacement:
Loosen the 2 screws from the battery access door of the case bottom. Lift the battery
access door and thus the battery compartment up. Replace the battery. Re-fasten the
screws.
Fuse replacement:
Loosen the 4 screws from the case bottom. Lift the end of the case bottom nearest the
input jacks until it unsnaps from the case top. Replace the blown fuse(s). Replace the
case bottom, and ensure that all the gaskets are properly seated and the two snaps on
the case top (near the LCD side) are engaged. Re-fasten the screws.
