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18-4
Replacing the AMPS fuse
The front panel AMPS fuse protects the Model 2790 AMPS current input from an over-
current condition. Follow the steps below to replace the AMPS fuse.
t^okfkd
1.
2.
3.
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4.
Figure 18-2
AMPS fuse
Make sure the instrument is disconnected from the power line and
other equipment before replacing the AMPS fuse.
Turn off the power and disconnect the power line and test leads.
Rotate the fuse carrier one-quarter turn counterclockwise. (See
Release pressure on the jack and its internal spring will push the fuse carrier out of
the socket.
Remove the fuse and replace it with the same type: 3A, 250V, fast-blow, Keithley
part number FU-99-1.
Do not use a fuse with a higher current rating than specified or instru-
ment damage may occur. If the instrument repeatedly blows fuses,
locate and correct the cause of the trouble before replacing the fuse.
Install the new fuse by reversing the above procedure.
MATH O U T P U T
RATIO
CH AVG
DCV
ACV
ACI
SHIFT
DCI
DELAY
HOLD
LIMITS
ON/OFF
LOCAL
EX TRIG
TRIG
STORE
RECALL
POWER
SAVE
SETUP
CONFIG
HALT
OPEN
CLOSE
STEP
SCAN
Model 2790 SourceMeter
Model 2790
Model 2790 SourceMeter Switch System
CONT
OCOMP
PERIOD SENSOR
Ω2
Ω4
FREQ
TEMP
RANGE
MONITOR
TYPE
CH-OFF
CARD
AUTO
FILTER
REL
RANGE
TEST
LSYNC
GPIB
RS-232
DIGITS RATE
EXIT
ENTER
Counterclockwise
®
Switch System Reference Manual
Figure
18-2.)
SENSE
INPUT
Ω 4 WIRE
HI
350V
1000V
!
PEAK
PEAK
LO
500V
PEAK
INPUTS
F
R
F
F
FRONT/REAR
3A 250V
AMPS
Rotate
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