Chapter 1 Installation and Maintenance 21
Installation
Verification
The following program verifies that the multimeter is operating and can
communicate with the controller over the GPIB bus.
10 PRINTER IS 1
20 OUTPUT 722;"ID?"
30 ENTER 722; IDENT$
40 PRINT IDENT$
50 END
If the multimeter has been correctly installed, the message HP 3458A will
be printed on the designated system printer. If no message is printed, make
sure power is applied to the multimeter. Also check the GPIB connections,
the interface address setting, and the multimeter's address.
Maintenance
This section describes how to replace the multimeter's fuses and how to
obtain repair service.
Replacing the Line
Power Fuse
The line power fuse holder is located on the right side of the multimeter's
rear panel. Before replacing the fuse, disconnect the multimeter's line power.
To replace the fuse, use a small flatblade screwdriver to push in on the fuse
cap and rotate it counterclockwise. Remove the fuse cap and replace the fuse
with the appropriate type (see Table 4). (The Agilent part number for the gray
line power fuse cap is 2110-0565.) Re-install the fuse cap and apply power.
Replacing a Current
Fuse
Each of the front and rear current terminals (labeled I) contains a current fuse.
To access the fuse, unscrew (rotate counterclockwise) the current terminal
binding post knob until it stops. Push in on the terminal and rotate it
clockwise. The entire terminal/fuse assembly can now be removed as shown
in Figure 5. If necessary, replace the fuse with a 1A 250V NTD fuse (Agilent
part number 2110-0001). (CAUTION: never use a slow-blow fuse as a
current fuse; multimeter damage will result.) Replace the terminal/fuse
assembly by pushing it in and turning counterclockwise until the assembly
locks in place.
Table 4. Replacement Power Line Fuses and Caps
Line Voltage Power Line Fuse
100 or 120 VAC (Nominal) 1.5A NTD, Agilent Part Number 2110-0043
220 or 240 VAC (Nominal) 500mAT SB, Agilent Part Number
2110-0202
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