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EX1200 Series Maintenance 141
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MAINTENANCE
REPLACEABLE FUSE
The EX1200 DMM has a replaceable fuse located on its front panel for current input and is user-
replaceable. It is a 3.15 A, 250 V fuse and can be replaced with VTI P/N: 35-0054-315.
Alternatively, P/N: 2173.15XP from Littlefuse, Inc. may also be used as a replacement.
DMM REMOVAL/REPLACEMENT
VTI recommends annual calibration of the EX1200 DMM to assure that the instrument maintains
the tightest specifications. To eliminate the need to return an entire mainframe for calibration to
VTI, the DMMs for the EX1266, EX1267, EX1268, and EX1269 can be removed from
mainframe. The mainframes can still be used once the DMM has been removed.
The following sections describe how to remove the DMM from the two mainframes.
EX1266 DMM Removal
Removal Procedure
1) Remove the three screws shown in Figure 9-1 using the #2 Phillips screwdriver. Retain these
screws for re-installation.
2) Use the handle on the front panel of the DMM to slowly remove the DMM from the chassis.
Note that once half of the DMM has been removed, remove the connector at J6 on the input
board.
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