Keithley 2657A, Reference Manual, Page: 707 / 805

Model 2657A High Power System SourceMeter® Instrument Reference Manual Appendix A: Maintenance
2657A-901-01 Rev. B/December 2012 A-3
Keys test
This test lets you check the functionality of each front panel key.
Perform the following steps to run the KEYS test:
1. If the Model 2657A is in remote mode, press the
EXIT (LOCAL)
key once to place the instrument
in local mode.
2. Press the
MENU
key.
3. Navigate through the menus by turning the navigation wheel . Press the
ENTER
key to select
the menu items as follows:
DISPLAY > TEST > DISPLAY-TESTS
.
4. Turn the navigation wheel until the
KEYS
menu item is highlighted.
5. To start the test, press the
ENTER
key. While the test is active, when you press a key, the label
name for that key is displayed to indicate that it is functioning properly. When you release the key,
the message “No keys pressed” is displayed.
6. To test the EXIT (LOCAL) key, press the
EXIT (LOCAL)
key once.
7. To exit the test, press the
EXIT (LOCAL)
key twice consecutively. You will exit the test and the
instrument returns to the FRONT PANEL TESTS menu.
8. Press the
EXIT (LOCAL)
key multiple times to exit out of the menu structure.
Display patterns test
This test lets you verify that each pixel and indicator in the vacuum fluorescent display is working
properly.
Perform the following steps to run the display test:
1. If the Model 2657A is in remote mode, press the
EXIT (LOCAL)
key once to place the instrument
in local mode.
2. Press the
MENU
key.
3. Navigate through the menus by turning the navigation wheel , and then pressing the
ENTER
key to select the items as follows:
DISPLAY > TEST > DISPLAY-TESTS
.
4. Turn the navigation wheel until the
DISPLAY-PATTERNS
menu item is highlighted.
5. To start the display test, press the
ENTER
key. There are three parts to the display test. Each
time the
ENTER
key or the navigation wheel is pressed, the next part of the test sequence is
selected. The three parts of the test sequence are as follows:
•
Checkerboard pattern and the indicators that are on during normal operation
•
Checkerboard pattern (alternate pixels on) and all the numeric indicators (which are not used) are
illuminated
•
Each digit (and adjacent indicators) is sequenced; all of the pixels of the selected digit are on
6. When finished, abort the display test by pressing the
EXIT (LOCAL)
key. The instrument returns
to the FRONT PANEL TESTS menu. Continue pressing the
EXIT (LOCAL)
key to exit out of the
menu structure.