Keithley 6487 Reference Manual

Model 6487 Reference Manual Calibration 16-15
Resetting the calibration code
If you forget the calibration code, you can unlock calibration by shorting together the CAL
pads which are located on the display circuit board inside the unit. Doing so will also reset
the code to the factory default (006487).
Displaying calibration dates
To display calibration dates at any time:
1. From normal display, press MENU, select CAL, then press ENTER. The unit will
display the following:
CAL: VOFFSET
2. Use either RANGE key to select CAL: DATES, then press ENTER. The
Model 6487 will display the last calibration date, for example:
DATE: 11/15/02
3. Press ENTER to view the calibration due date, for example:
NDUE: 11/15/03
4. Press EXIT to return to normal display.
Displaying the calibration count
To display the calibration count at any time:
1. From normal display, press MENU, select CAL, then press ENTER. The unit will
display the following:
CAL: VOFFSET
2. Use either RANGE key to select CAL:COUNT from the calibration menu, then
press ENTER. The unit displays the calibration count, for example:
COUNT: 1
3. Press EXIT to return to normal display.

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%