Keithley 6487 Reference Manual

16-8 Calibration Model 6487 Reference Manual
Current calibration
20μA-20mA range calibration
1. Connect the triax shielding cap to the Model 6487 rear panel INPUT jack.
2. Select the Model 6487 20μA range.
3. Press MENU, select CAL, then press ENTER. At the CAL: RUN prompt, press
ENTER. The unit will prompt for the zero calibration point:
20μA ZERO
4. With the triax shielding cap connected to the INPUT jack for a 0μA input current,
press ENTER.
5. The unit will prompt for the positive full-scale cal point:
+20μA CAL
6. Connect the current calibrator to the Model 6487 INPUT jack (Figure 16-1). Use
the coax cable and two adapters where shown.
7. Press ENTER. The unit will prompt for the positive full-scale current:
+20.00000 μA
8. Set the calibrator current to +20.00000μA then adjust the display to agree with the
calibrator current.
9. Press ENTER. The unit will prompt for the negative full-scale calibration point:
-20μA CAL
10. Press ENTER. The Model 6487 will prompt for the negative full-scale calibration
current:
-20.00000 μA
11. Set the calibrator output to –20.00000μA, then adjust the display to agree with the
calibrator value. Press ENTER to complete calibration of the present range.
12. Press EXIT to return to normal display.
13. Repeat steps 1 through 12 for the 200μA through 20mA ranges using Table 16-5 as
a guide.

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%