Keithley 6485 User Manual

Model 6485 Instruction Manual Calibration 16-5
Calibration menu
You can access the calibration menu by pressing MENU, selecting CAL, and then press-
ing ENTER. The various selections are summarized in Table 16-3. Use the up and down
RANGE keys to scroll through these selections.
Table 16-2
Test uncertainty ratios with recommended equipment
Range 5700 + 5156
Test uncertainty
ratio
2nA 7ppm + 300ppm 13.0
20nA 7ppm + 200ppm 19.3
200nA 5ppm + 200ppm 9.8
2uA 7ppm + 200ppm 7.2
20uA 550ppm 1.8
200uA 100ppm 10.0
2mA 55ppm 18.2
20ma 55ppm 18.2
Table 16-3
Calibration menu
Menu Item* Description
VOFFSET Performs offset voltage calibration.
COUNT Displays calibration count.
RUN Calibrates present range.
DATES Displays calibration and due dates.
UNLOCK Unlocks calibration using code.
LOCK Locks cal, exits to the main menu.
SAVE Saves calibration constants.
* Press MENU, select CAL, then press ENTER to access. Use up or down RANGE
to scroll through selections.

Keithley 6485 Specifications

General

Model	Keithley 6485
Category	Picoammeter
Input Impedance	>10^14 Ohms
Voltage Burden	<200µV
Accuracy	0.4% of reading
Voltage Source Range	Not Applicable
Voltage Source Resolution	Not Applicable
Voltage Source Accuracy	Not Applicable
Interface	IEEE-488
Power Requirements	100V to 240V AC, 50/60Hz
Dimensions	89 mm high x 214 mm wide x 369 mm deep (3.5 in x 8.4 in x 14.5 in)