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8.4 FUSE REPLACEMENT
8-1. The fixture should be used wherever a shielded
enclosure is called for at various places in the procedure.
A rear panel fuse protects the power line input of the in-
strument. Use the following procedure to replace the line
fuse'.
Calibration should be performed every I2 months, or if the
"' peiforman ce verification procedures in Section 6 show that
the instrumefit is out of specifiiation. If any of the calibra-
WARNING
tion procedures cannot be performed properly, refer to the
Disconnect the instrument from the power line
troubleshooting information in this section.
and other equipment before replacing the fuse.
1. With the power off, place the end of a flat-blade screw-
driver into the slot in the rear panel LINE FUSE holder
Push in gently and rotate the fuse carrier onequarte
turn counterclockwise. Release pressure on the holde
and its internal spring will push the fuses and carrier ou
of the holder.
2. Remove the fuse and replace it with the type recom
mended in Table 8-2.
r
:~I
r
t
Table 8-2. Line Fuse Selection
Line Voltage Fuse Type
I
Keithley
Part Number
I
90425v
'/&I, 25W, MG, Slo Blo
FU-20
19525cv
Y&, 25OV, 3AG, Slo Blo
FU-21
CAUTION
Do not use a fuse with a higher current rating
than specified, or instrument damage may oc-
cur. If the instrument repeatedly blows fuses,
locate and correct the cause of the trouble
before replacing the fuse.
3. Install the new fuse and the fuse carrier into the holde
by reversing the above procedure.
8.5 CALIBRATION
Much of the calibration procedure for the Model 595 i s
digital in nature. Instead of the time-consuming methor'
L
"
NOTE:
TO
AVOID
CONTAMINATION.
00
NOT
TOUCH
BODY
OF
RESISTOR.
AFTER
ASSEMBLY.
CLEAN
ENTIRE
FIXTURE
WITH
METHANOL.
PARTS
LIST
1.
SHIELDED
BOX.
POMONA
P/N2909.
2.
ENC
CONNECTOR.
KEITHLEY
P/N
CS-4t.
3..
TWO
BANANA
JACKS.
KEITHLEY
P/N
BPII.
4.
BNC
CABLE
(NOT
SHOWN).
KEITHLEY
MODEL
4601.
NECESSARY
TO
CONNECT
FIXTURE
TO
595.
of adjusting numerous calibration potentiometers, the
technician need only apply an appropriate calibration signal
Figure 8-1. Test Fixture Construction
and digitally calibrate the instrument, either from the frontier
panel or over the IEEE-488 bus.
8.5.1 Recommended
Calibration
Equipment
Some of the calibration procedures will require a shielded
Table 8-3 lists recommended calibration equipment. Alter-
test fixture. Construction of this fiittie is detailed in Figure
r&e equipment may be used as long as equipment accuracy
is at least as good as the specifications listed in the table.
8-2
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Troubleshooting
