Keithley SourceMeter 2425, Service Manual

Page: 46 / 141

Model 2425 Service Manual Calibration 2-11
6. Select EXECUTE, then press ENTER. The instrument will display the following
message:
V-CAL
Press ENTER to 200.00mV
7. Press ENTER. The Model 2425 will 200mV and simultaneously display
the following:
DMM RDG: +200.0000mV
Use
ß
,
©
,
¹
,
ƒ
, ENTER or EXIT.
8. Note and record the DMM reading, and then adjust the Model 2425 display to
agree exactly with the actual DMM reading. Use the up and down arrow keys to
select the digit value, and use the left and right arrow keys to choose the digit posi-
tion (or use the number keys, 0-9, +/-). Note that the display adjustment range is
within ±10% of the present range.
9. After adjusting the display to agree with the DMM reading, press ENTER. The
instrument will then display the following:
V-CAL
Press ENTER to 000.00mV
10. Press ENTER. The Model 2425 will source 0mV and at the same time display the
following:
DMM RDG: +000.0000mV
Use
ß , © , ¹ , ƒ
, ENTER or EXIT.
11. Note and record the DMM reading, and then adjust the Model 2425 display to
agree with the actual DMM reading. Note that the display value adjustment limits
are within ±1% of the present range.
12. After adjusting the display value to agree with the DMM reading, press ENTER.
The unit will then display the following:
V-CAL
Press ENTER to Output -200.00mV
13. Press ENTER. The Model 2425 will source -200mV and display the following:
DMM RDG: -200.0000mV
Use
ß
,
©
,
¹
,
ƒ
, ENTER or EXIT.
14. Note and record the DMM reading, and then adjust the Model 2425 display to
agree with the DMM reading. Again, the maximum display adjustment is within
±10% of the present range.
15. After adjusting the display value to agree with the DMM reading, press ENTER
and note that the instrument displays:
V-CAL
Press ENTER to 000.00mV
16. Press ENTER. The Model 2425 will source 0mV and simultaneously display the
following:
DMM RDG: +000.0000mV
Use
ß
,
©
,
¹
,
ƒ
,
ENTER or EXIT.