Keithley SourceMeter 3A 2420, Service Manual

Page: 38 / 136

2-8 Calibration
2. Press the MENU key, then choose CAL and press ENTER. Select UNLOCK, and then
press ENTER. The instrument will display the following:
PASSWORD:
Use , , , , ENTER or EXIT.
3. Use the up and down range keys to select the letter or number, and use the left and right
arrow keys to choose the position. Enter the present password on the display. (Front
panel default: 002420.) Press ENTER to complete the process.
4. Press EXIT to return to normal display. Instrument operating states will be set as sum-
marized in Table 2-2.
Step 2: Voltage calibration
Perform the steps below for each voltage range, using Table 2-3 as a guide.
1. Connect the Model 2420 to the digital multimeter, as shown in Figure 2-1. Select the
multimeter DC volts measurement function.
NOTE
The 2-wire connections shown assume that remote sensing is not used. Remote
sensing may be used, if desired, but it is not essential when using the recommend-
ed digital multimeter.
2. From normal display, press the SOURCE V key.
3. Press the EDIT key to select the source field (cursor flashing in source display field), and
then use the down RANGE key to select the 200mV source range.
4. From normal display, press MENU.
5. Select CAL, and then press ENTER. The unit will display the following:
CALIBRATION
UNLOCK EXECUTE VIEW-DATES
SAVE LOCK CHANGE-PASSWORD
6. Select EXECUTE, and then press ENTER. The instrument will display the following message:
V-CAL
Press ENTER to 200.00mV
Model 2420
Digital Multimeter
Input HI
Input LO
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 2-1
Voltage calibration
test connections