Keithley SourceMeter 3A 2420 Service Manual page 26

1-12 Performance Verification
4.
5.
6.
3A range accuracy
1.
Figure 1-3
Connections for
3A range current
verification tests
2.
3.
4.
5.
6.
Verify output current accuracy for the 10µA-1A range currents listed in Table 1-5. For
each test point:
• Select the correct source range.
• Set the Model 2420 output current to the correct value.
• Verify that the multimeter reading is within the limits given in the table.
Repeat the procedure for negative output currents with the same magnitudes as those
listed in Table 1-5.
Repeat the entire procedure using the rear panel INPUT/OUTPUT jacks. Be sure to
select the rear panel jacks with the front panel TERMINALS key.
With the power off, connect the digital multimeter and the 1Ω resistor to the Model 2420
INPUT/OUTPUT jacks, as shown in Figure 1-3.
MEAS
Ω
EDIT V I FCTN
DISPLAY
0 1 2 3
TOGGLE
LOCAL REL
FILTER LIMIT
POWER
6 7 8 9
DIGITS SPEED STORE RECALL
Model 2420
Digital Multimeter
Select the multimeter DC volts measuring function.
Press the Model 2420 SOURCE I key to source current, and make sure the source output
is turned on.
Verify output current accuracy for the 3A range. Be sure to:
• Select the 3A source range.
• Set the Model 2420 output current to the correct 3A output value.
• Verify that the multimeter reading is within the 3A range limits given in Table 1-5.
(Since the value of the 1Ω resistor value is assumed to be the same as its nominal value,
the DMM voltage reading is the same as the sourced current.)
Repeat the procedure for a negative 3A current output value.
Repeat the entire procedure using the rear panel INPUT/OUTPUT jacks. Be sure to
select the rear panel jacks with the front panel TERMINALS key.
4- WIRE INPUT/
SENSE OUTPUT
HI
75V 5V 75V
PEAK PEAK PEAK

2420 3A SourceMeter
LO
250V
SOURCE
PEAK
V I
RANGE
4 5 EDIT
AUTO
TERMINALS
TRIG SWEEP
ON/OFF
RANGE FRONT/
+/-
REAR
CONFIG MENU EXIT ENTER
OUTPUT
Input HI
1Ω Resistor
Input LO