Digital Multimeter HDM3055 Series Manual

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Tools Required

l Allen driver (most disassembly)

l Small, flat-blade screw driver (for prying)

Procedure

[size=10.5000pt]1. Turn off the power and remove all measurement leads and other cables, including the power cord,

from the DMM before continuing.

2. Follow the disassembly procedure to disassemble the DMM.

3. Locate the battery on the front panel, and position the screwdriver tip under the battery, as shown.

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4. Use the screwdriver to pry the battery from the battery holder.

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5. Remove the battery and discard or recycle it in accordance with all applicable regulations.

6. Position the new battery in the battery holder, + side up. Push down gently to seat the battery in

the holder.

7. Re-assemble the DMM completely before connecting any cables or cords. This concludes the

battery replacement procedure.

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3 A and 10 A Current Path Fuse Replacement

This section describes the procedure for testing and replacing the 3 A and 10 A current path fuses

inside the DMM.

WARNING Only qualified, service-trained personnel who are aware of the hazards involved

should remove DMM covers. Always disconnect the power cable and any

external circuits before removing the DMM cover. Some circuits are active and

have power applied even when the power switch is turned off.

Always disconnect all inputs, cords, and cables before disassembling the DMM.

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CAUTION Do not turn the screw that fastens the shield in place, as this will affect the DMM's calibration.

Tools Required

l Allen driver (most disassembly)

l Small, flat-blade screw driver (for prying)

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Testing the Fuses

3 A Current Path

file:///C:/Users/ADMINI~1/AppData/Local/Temp/ksohtml14384/wps3.pngTo determine whether the instrument's 3 A current path has a fuse that must be replaced, press

[Cont] to put the DMM in continuity measurement mode, and short the HI Input terminal to the 3

A current terminal.

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If the measurement displays OPEN, one of the two fuses must be replaced. One fuse is accessible

from the instrument's rear panel; the other is internal.

If the 3 A current path has a bad fuse, it is very likely to be the fuse accessible from the lower left

corner of the instrument's rear panel (3.15 A, 500 VAC/400 VDC, time delay).

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Simply use a figure to push down and turn the fuse holder counter-clockwise and access the fuse.

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Put the new fuse into the fuse holder and insert the assembly back into the instrument, turning the

fuse holder clockwise to lock it in place.

If the 3 A path still has a bad fuse, replace the internal 3 A current path fuse as described below.

10 A Current Path  

To determine whether the instrument's 10 A current path has a fuse that must be replaced, press

[Cont] to put the DMM in continuity measurement mode, and short the HI Input terminal to the 10 A

current terminal. If the measurement displays OPEN, replace the internal 10 A current path fuse as

described below.