Keithley 6487 Reference Manual

16-10 Calibration Model 6487 Reference Manual
4. Press MENU, select CAL, then press ENTER. At the CAL: RUN prompt, press
ENTER again. The unit will prompt for the zero calibration point:
2NA ZERO
5. Set the calibrator voltage to 0V then press ENTER.
6. The instrument will prompt for the positive full-scale calibration point:
+2NA CAL
7. Press ENTER. The instrument will prompt for the positive full-scale calibration
current:
+2.000000 NA
8. 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
the Model 6487 display to agree with the calculated current, then press ENTER.
9. The Model 6487 will prompt for the negative full-scale calibration point:
-2NA CAL
10. Press ENTER. The instrument will prompt for the negative full-scale current:
-2.000000 NA
11. Set the calibrator output voltage to –2.000000V, then calculate the calibration cur-
rent from the calibrator voltage and standard resistor value: I = V/R. Adjust the
Model 6487 display to agree with the calculated current, then press ENTER to
complete calibration of the present range.
12. Press EXIT to return to normal display.
13. Repeat steps 3 through 12 for the 20nA through 2μA ranges using Table 16-6 as a
guide. Be sure to make connections to the correct standard resistor and set the cali-
brator voltages to the correct values.

Keithley 6487 Specifications

General

Type	Picoammeter/Voltage Source
Current Measurement Range	20 fA to 20 mA
Interfaces	GPIB, RS-232
Voltage Burden	< 200 µV
Input Impedance	>10^14 Ω
Power	100 V / 120 V / 220 V / 240 V
Basic Current Measurement Accuracy	0.4%