Keithley 2520, User Manual, Page: 45 / 329

Model 2520 User’s Manual Getting Started 1-19
• A measurement or source range is changed by selecting the function by pressing
any one of the LASER or DETECTOR function keys and using the RANGE
▲
or
▼
keys. (The unit must be in the edit mode to change the laser diode source range.)
Note that when the next higher or lower range is selected, the reading increases or
decreases by a decade.
• A parameter value is keyed in by placing the cursor on the digit to be changed and
using one of the following methods:
NOTE
You can clear a parameter value by pressing the 0000 (MENU) key.
• Use the EDIT
▲
or ▼ or RANGE
▲
or ▼ keys to increment or decrement the
digit.
• Use the number keys (0 through 9) to key in the value at the selected digit.
• Use the ± key to change source value polarity, regardless of cursor position.
• Boolean selections (such as ON/OFF and HIGH/LOW) are toggled by placing the
cursor on the selection and pressing an EDIT
▲
or ▼ or RANGE
▲
or ▼ key.
• A change is only executed when ENTER is pressed. Entering an invalid parameter
generates an error, and the entry is ignored. However, entering an out-of-range
value (too small or too large) selects the lower or upper limit, respectively.
• The EXIT key is used to back out of the menu structure. Any change that is not
entered is cancelled when EXIT is pressed.
Main operation menus
The main operation menus described in Table 1-5 are accessed by pressing one of these
main operation keys:
• COMM — Selects GPIB or RS-232 interface, programs interface parameters.
• SETUP — Saves and recalls user and factory configurations.
• DIG OUT — Sets Digital I/O port binary output value.