Keithley 6485 Instruction Manual page 208

16-8 Calibration
9.
10.
11.
12.
13.
Table 16-4
20 µ A to 20mA range calibration summary
Model 6485 Range
20µA
200µA
2mA
20mA
* 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.
Press ENTER. The unit will prompt for the negative full-scale calibration point:
-20µA CAL
Press ENTER. The Model 6485 will prompt for the negative full-scale calibration
current:
-20.00000 µA
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.
Press EXIT to return to normal display.
Repeat steps 1 through 12 for the 200µA through 20mA ranges using
a guide.
0µA
+20.00000µA
-20.00000µA
0µA
+200.0000µA
-200.0000µA
0mA
+2.000000mA
-2.000000mA
0mA
+20.00000mA
-20.00000mA
Calibrator Currents*
Model 6485 Instruction Manual
Table 16-4 as