Keithley 6485 - Page 208

16-8 Calibration Model 6485 Instruction Manual
9. Press ENTER. The unit will prompt for the negative full-scale calibration point:
-20µA CAL
10. Press ENTER. The Model 6485 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 16-4 as
a guide.
Table 16-4
20 µ A to 20mA range calibration summary
Model 6485 Range Calibrator Currents*
20µA0µA
+20.00000µA
-20.00000µA
200µA0µA
+200.0000µA
-200.0000µA
2mA 0mA
+2.000000mA
-2.000000mA
20mA 0mA
+20.00000mA
-20.00000mA
* Calibrate zero, positive full-scale, and negative full-scale for each
range. BNC shielding cap used for zero calibration point for all
ranges. See procedure.