Section 2: Getting started Model 6517B Electrometer Reference Manual
2-6 6517B-901-01 Rev. C / August 2015
1. On the side of the fuse holder are two small tabs. Use a small flat blade screwdriver to pry the
fuse drawer open.
2. Slide the fuse drawer out to gain access to the fuses. Snap the old fuse out of the drawer and
replace it with the same type.
 For 100 V and 120 V line voltage, use a 0.630 A, 250 V, 5 mm x 20 mm fuse (Keithley P/N:
FU-106-.630).
 For 220 V and 240 V line voltage, use a 0.315 A, 250 V, 5 mm x 20 mm fuse (Keithley P/N:
FU-106-.315).
3. Push the fuse drawer back into the power module.
For continued protection against fire or instrument damage, only replace fuses with the type and
rating listed. If the instrument repeatedly blows fuses, locate and correct the cause of the problem
before replacing the fuse.
Power-up sequence
When the Model 6517B is powered up, it performs self-tests on its EPROM and RAM, and checksum
tests on data stored in nonvolatile memory (see Power-up error messages (on page 2-7)). If a failure
is detected, the instrument momentarily displays an error message and the ERR annunciator turns
on. If a problem develops while the instrument is under warranty, return it to Keithley Instruments for
repair.
If the instrument passes the self-tests, the firmware revision levels and the communications status are
displayed. An example of this display is shown as follows:
Model 6517B
Rev. A01 700x SCPI: 27
The firmware revision levels (left to right) are for the main microcontroller and display microcontroller.
The revision level number may be different in your particular unit. The IEEE-488 address is its default
value of 27 and the SCPI language is selected. If the RS-232 interface is selected, the message "RS-
232 MODE" is displayed instead of the IEEE-488 address.
Next, if the unit is configured to display the calibration due date when it is turned on, the unit shows
the following:
Model 6517B
Calibration due: mmm/dd/yy
Where: mmm is the month abbreviation, dd is the day, and yy is the year. If no calibration date is set,
the display shows that it is due now.
After the power-up sequence, the instrument begins its normal display with zero check enabled
("Zero Check" displayed).
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