Keithley 6430 Instruction Manual page 468

19-18 Calibration
5.
6.
7.
8.
9.
10.
11.
12.
13.
1pA to 100nA ranges
NOTE
1.
2.
3.
Press ENTER. The unit will prompt you for the DMM current reading:
DMM RDG: +00.00000µA
Use , ▲, ▼, , ENTER or EXIT.
Note the DMM current reading, then adjust the Model 6430 display to agree with that
value, and press ENTER.
The unit will prompt you for the first 85% of full scale output value as follows:
I-CAL
Press ENTER to Output +08.50000µA
Press ENTER. The unit will prompt you for the DMM current reading:
DMM RDG: +08.50000µA
Use , ▲, ▼, , ENTER or EXIT.
Note the DMM current reading, then adjust the Model 6430 display to agree with that
value, and press ENTER.
The unit will once prompt you for the second 85% of full scale output value as follows:
I-CAL
Press ENTER to Output +08.50000µA
Press ENTER. The unit will prompt you for the DMM current reading:
DMM RDG: +08.50000µA
Use , ▲, ▼, , ENTER or EXIT.
Note the DMM current reading, then adjust the Model 6430 display to agree with that
value, and press ENTER.
Repeat steps 4 through 12 for the 1µA range.
Because of Model 5156 characterization accuracy limitations, Model 6430
1pA-100nA range accuracy will be relative to Model 5156 characterization
accuracy.
Connect the Model 6430 mainframe and Remote PreAmp to the digital multimeter and
calibration standard as shown in Figure 19-5. (Connect mainframe INPUT/OUTPUT
HI to DMM INPUT HI and LO respectively. Connect the Remote PreAmp IN/OUT
HIGH jack directly to the Model 5156 OUTPUT jack, and connect the BNC shorting
cap to the resistance jack being used. Also be sure to remove the link between SHIELD
and CHASSIS.)
Select the multimeter DC volts function, 10 PLCs, and enable auto-range.
From the calibration menu, select GAIN, then press ENTER. The instrument will
prompt you for Remote PreAmp gain calibration:
PREAMP GAIN CAL
10uA 1uA 100nA 10nA 1nA
100pA 10pA 1pA