Keithley SourceMeter 3A 2420, Service Manual

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Performance Verification 1-11
*Measure range coupled to source range when simultaneously sourcing and measuring voltage.
**As measured by precision digital multimeter. Use closest possible value, and modify reading limits
accordingly if necessary.
Output current accuracy
Follow the steps below to verify that Model 2420 output current accuracy is within specified
limits. The test involves setting the output current to each full-range value and measuring the
currents with a precision digital multimeter.
10
µ
A to 1A range accuracy
1. With the power off, connect the digital multimeter to the Model 2420 INPUT/OUTPUT
jacks, as shown in Figure 1-2.
2. Select the multimeter DC current measuring function.
3. Press the Model 2420 SOURCE I key to source current, and make sure the source output
is turned on.
Table 1-4
Voltage measurement accuracy limits
Model 2420 source
and measure range*
Source voltage*
Model 2420 voltage reading
limits (1 year, 18°C-28°C)
200mV
2V
20V
60V 200.000mV
2.00000V
20.0000V
60.0000V 199.676 to 200.324mV
1.99946 to 2.00054V
19.9960 to 20.0040V
59.9880 to 60.0120V
Model 2420
Digital Multimeter
Input LO
Amps
2420 3A SourceMeter
250V
PEAK
5V
PEAK
HI
LO
OUTPUT
75V
PEAK
75V
PEAK
EDIT
TOGGLE
POWER
RANGE
INPUT/
OUTPUT
4- WIRE
SENSE
DISPLAY
ON/OFF
TERMINALS
FRONT/
REAR
AUTO
RANGE

EXIT ENTER CONFIG MENU
SWEEP TRIG REL LOCAL FILTER LIMIT
DIGITS SPEED
V
Ω
MEAS
I FCTN V I
SOURCE
2 3 0 1
6 7 8 9
4
+/-
5
STORE RECALL
EDIT
Figure 1-2
Connections for 10
µ
A
to 1A range current
verification tests