Amprobe AMB-25 Insulation-Tester - Manual (Page 7)

individually, leaving the other connected to the grounded motor housing.
The above also applies to DC Generators. 3). Press TEST key, the display should indicate approximately 0.5Ω, if the
display reads OL, replace the fuse as described next and test again.
12 11
8-2 Replace the Fuse
Warning
To avoid electric shock, personal injury or damage to the meter, use
only the specified fuse.
1). Set the function switch to OFF position.
2). Disconnect test leads from any power source.
3). Place the meter face down on a nonabrasive surface and loosen the
four screws.
4). Take off the bottom cover.
5). Remove the fuse, replace with a new fuse.
6). Place the bottom cover on and secure the four screws.
CABLES 7). Test the fuse (refer 8-1 Testing the Fuse).
Disconnect the cable from power. Also disconnect opposite end to avoid
errors of any leakage from other equipment. Check each conductor to
ground and /or lead source by connecting one megohmmeter lead to a
ground and /or lead source and the other megohmmeter lead to each of the
conductors in turn. Check insulation resistance between conductors by
connecting megohmmeter leads to conductors in pairs.
9. BATTERY REPLACEMENT
1). Set the function switch to OFF position.
2). Disconnect test leads from any power source.
3). Place the meter face down on a nonabrasive surface and loosen the
two screws.
4). Take off the battery cover.
5). Remove the battery, replace with six new batteries.
6). Place the battery cover on and secure the two screws.
10. MAINTENANCE & CLEANING
Maintenance & Clearing :
8. FUSE CHECK & REPLACEMENT
1). Repairs or servicing not covered in this manual should only be
performed by qualified personnel.
8-1 Testing the Fuse
2). Periodically wipe the case with a dry cloth.
Do not use abrasives or solvents on this instrument.
1). Set the function switch to LoΩ position.
2). Connect the test leads to the input terminals and short then together.