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19-12 Calibration

2. Select the amps function on Model 6514.

3. Select Model 6514 20pA range.

4. Press SHIFT then CAL, then press ENTER at the CAL: RUN prompt. The unit will

prompt for the zero calibration point:

20PA ZERO

5. Allow the settling time listed in Table 19-5, then press ENTER.

6. The instrument will prompt for the positive full-scale calibration point:

+20PA CAL

7. Connect the voltage calibrator and Model 5156 Electrometer Calibration standard to the

Model 6514 INPUT jack, as shown in Figure 19-3. Initially, make connections to the

100GΩ resistance.

8. Press ENTER. The instrument will prompt a full-scale calibration current:

20.00000 PA

9. Set the calibrator voltage to +2.000000V. Calculate the actual calibration current from

the calibrator voltage and the actual standard resistor value: I = V/R. Adjust Model 6514

display to agree with the calculated current. Allow the settling time listed in Table 19-5,

then press ENTER.

10. Model 6514 will prompt for the negative full-scale calibration point:

-20PA CAL

11. Press ENTER. The instrument will prompt for the negative full-scale current:

-20.00000 PA

12. Set the calibrator output voltage to -2.000000V, then calculate the calibration current

from the calibrator voltage and standard resistor value: I = V/R. Adjust Model 6514 dis-

play to agree with the calculated current. Allow the settling time listed in Table 19-5,

then press ENTER to complete calibration of the present range.

13. Press EXIT to return to normal display.

14. Repeat steps 1 through 13 for the 200pA through 2µA ranges using Table 19-5 as a

guide. Be sure to make connections to the correct standard resistor.

Keithley 6514 User Manual

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