Keithley SourceMeter 2425, Руководство по обслуживанию

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Model 2425 Service Manual Performance Verification 1-13
Output current accuracy
Follow the steps below to verify that Model 2425 output current accuracy is within speci-
fied limits. The test involves setting the output current to each full-range value and mea-
suring 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 2425 INPUT/
OUTPUT jacks, as shown in Figure 1-2.
Figure 1-2
Connections for 10
μ
A to 1A range current verification tests
Model 2425
2425 100 W SourceMeter
250V
PEAK
5V
PEAK
HI
LO
OUTPUT
125V
PEAK
125V
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
Digital Multimeter
Input LO
Amps
2. Select the multimeter DC current measuring function.
3. Press the Model 2425 SOURCE I key to source current, and make sure the source
output is turned on.
4. Verify output current accuracy for the 10
μ
A-1A range currents listed in Table 1-5.
For each test point:
• Select the correct source range.
• Set the Model 2425 output current to the correct value.
• Verify that the multimeter reading is within the limits given in the table.