Keithley 2520, User Manual, Page: 71 / 329

Model 2520 User’s Manual Basic Operation 3-11
Pulse mode
1. Press CONFIG then LASER I
L
to access the source configuration menu.
2. Choose POLARITY, then press ENTER.
3. Select POSITIVE or NEGATIVE as desired, then press ENTER ( Figure 3-2 ).
4. Select SHAPE, then press ENTER.
5. Choose PULSE, then press ENTER.
6. Select LOW, then press ENTER.
7. Set the pulse low amplitude to the desired value, then press ENTER.
8. Press EXIT to return to normal display.
9. Press the PW key, then set the pulse width to the desired value.
10. Press the DELAY key, then set the pulse delay as required.
11. Press the LASER I
L
key, then press EDIT to enter the edit mode.
12. While in the edit mode, use the RANGE
▲
and ▼ keys to select the desired source
range (500mA or 5A).
13. Use the EDIT
▲
and ▼ or numeric keys to set the source amplitude to the desired
level. For the pulse mode, this value will be the high pulse level.
14. Press the COMPL key, then set the voltage compliance (limit) to the desired value.
Press ENTER to complete your selection and return to normal display.
Setting photodiode detector source values
The basic procedure for editing photodiode detector source values is outlined below.
1. Press the DETECTOR 1 V
B
or DETECTOR V
B
key, then the EDIT key so the
blinking cursor is in the source display field to be edited.
2. To simply increment or decrement the displayed source value, use the EDIT and
and ▲ and
▼
keys, or use the numeric keys to enter the value directly. Again,
the source value will be updated immediately; you need not press ENTER to com-
plete the process.
3. Repeat steps 1 and 2 for the other photodiode source.
▲
▲