Output Current Accuracy - Keithley 2425 Service Manual

Model 2425 Service Manual

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.
10μA to 1A range accuracy
1.
Figure 1-2
Connections for 10μA to 1A range current verification tests
V
EDIT
DISPLAY
0
TOGGLE
LOCAL
POWER
6
DIGITS SPEED
2.
3.
4.
With the power off, connect the digital multimeter to the Model 2425 INPUT/
OUTPUT jacks, as shown in Figure 1-2.
MEAS SOURCE
Ω
I
FCTN V I
1
2 3 4 5
REL FILTER LIMIT TRIG SWEEP
+/-
7 8 9
STORE RECALL CONFIG MENU
Model 2425
Digital Multimeter
Select the multimeter DC current measuring function.
Press the Model 2425 SOURCE I key to source current, and make sure the source
output is turned on.
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 2425 output current to the correct value.
• Verify that the multimeter reading is within the limits given in the table.
4- WIRE
SENSE
125V
PEAK
®
2425 100 W SourceMeter
RANGE
EDIT
AUTO
ON/OFF
RANGE
EXIT ENTER
OUTPUT
Performance Verification
INPUT/
OUTPUT
HI
5V 125V
PEAK PEAK
LO
250V
PEAK
!
TERMINALS
FRONT/
REAR
Input LO
1-13
Amps