Keithley 2700, Service Manual

Page: 76 / 174

3-4 Routine Maintenance
Replacing the front terminal AMPS fuse
The front terminal AMPS fuse protects the Model 2700 current input from an over-current
condition. Follow the steps below to replace the AMPS fuse.
WARNING Make sure the instrument is disconnected from the power line and other
equipment before replacing the AMPS fuse.
1. Turn off the power, and disconnect the power line and test leads.
2. From the front panel, gently push in the AMPS jack with your thumb, and rotate the
fuse carrier one-quarter turn counterclockwise. (See
Figure 3-2 .) Release pressure on
the jack, and its internal spring will push the fuse carrier out of the socket.
3. Remove the fuse, and replace it with the same type: 3A, 250V, fast-blow, Keithley part
number FU-99-1.
CAUTION Do not use a fuse with a higher current rating than specified or instrument
damage may occur. If the instrument repeatedly blows fuses, locate and
correct the cause of the trouble before replacing the fuse.
4. Install the new fuse by reversing the above procedure.
Model 2700 Multimeter / Data Acquisition System
RANGE
!
F
500V
PEAK
FRONT/REAR
3A 250V
AMPS
HI
INPUT
LO
SENSE
Ω
4 WIRE
INPUTS
350V
PEAK
1000V
PEAK
AUTO
SHIFT
LOCAL
POWER
RANGE R
EXIT ENTER DIGITS RATE
REL FILTER
TRIG
EX TRIG STORE RECALL
OPEN
DCV DCI
MATH O U T P U T
RATIO
ACV
ACI
Ω
2
Ω
4 FREQ TEMP
CH AVG CONT
PERIOD SENSOR
LIMITS ON/OFF DELAY
HOLD
SAVE SETUP CONFIG HALT
TYPE
LSYNC TEST
MONITOR
STEP SCAN
OCOMP
CH-OFF CARD
CLOSE
Integra Series
RS-232 GPIB
Push in AMPS
and Rotate
Counterclockwise
Model 2700
Figure 3-2
Front terminal
AMPS fuse