Keithley SourceMeter 3A 2420 Service Manual page 127

4. Make sure the digital multimeter primary address is set to its factory default setting (22).
5. Make sure that the computer bus driver software (CECHP.EXE) is properly initialized.
6. Enter the QBasic editor, and type in the program below.
Be sure to change the OneOhm parameter to the characterized value of 1 Ω resistor.
NOTE
(See Section 2 for details.)
7. Check thoroughly for errors, then save it using a convenient filename.
8. Run the program, and follow the prompts on the screen to perform calibration. For test
connections, refer to the following figures in Section 2:
• DMM volts connections: Figure 2-1.
• 10µA to 1A range current connections: Figure 2-2.
• 1Ω resistor and DMM connections for 3A range: Figure 2-3.
Calibration Programs C-3