Connections For 5A Current Calibration - Keithley 2303 Service Manual

6. Using the edit keys, adjust the display to agree with the new DMM voltage reading, then
press ENTER. The unit will then will then prompt for DVM full-scale calibration:
FULL SCALE DVM
ALL READY TO DO?
7. Press ENTER to complete DVM full-scale calibration.
Connect the digital multimeter volts input and characterized 4 Ω resistor to the Model
8.
2303 OUTPUT SOURCE terminals, as shown in Figure 2-3. Be sure to observe proper
polarity (SOURCE + to DMM INPUT HI; SOURCE - to INPUT LO).
9. Be sure the digital multimeter DC volts function and auto-ranging are still selected.
Ω2
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Model 2001 DMM
Note: Use 4-wire connections
to resistor terminals.
Figure 2-3

Connections for 5A current calibration

10. At this point, the unit will prompt for 5A full-scale calibration output:
SOURCE 5 AMPS
SET 1.90000 A
11. Using the edit keys, adjust the set value to 1.9000A, then press ENTER. The unit will
then prompt you for the DMM reading, which calibrates the 5A current limit:
SOURCE 5 AMPS
READ1 1.90000 A
12. Note the DMM voltage reading, then calculate the current from that reading and the
actual 4 Ω resistance value: I = V/R. Adjust the Model 2303 current display value to agree
with the calculated current value, and press ENTER.
Input HI
SENSE
Ω 4 WIRE INPUT
HI
350V 1100V
!
PEAK PEAK
2001 MULTIMETER
LO
500V
PEAK
INPUTS
Ω4
FREQ TEMP
RANGE F R
AUTO
FRONT/REAR
2A 250V
AMPS
RANGE
CAL
EXIT ENTER
Sense +
WARNING: WARNING:
CAUTION:
CAUTION:
Calibration
Input LO
4 Ω Resistor
Sense -
Source + Source -
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
LINE FUSE
ISOLATION FROM EARTH:
SLOWBLOW
22 VOLTS MAX.
2.5A, 250V
LINE RATING
100-240VAC
50, 60 HZ
+ _ _ _ _
+ + + 185VA MAX
SOURCE SENSE SOURCE DVM IN
OUTPUT
0-20V, 0-5A
IEEE-488
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
MADE IN
U.S.A.
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING. FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
Model 2303
2-7
REMOTE
DISPLAY
OPTION