Input A And Input B Tests - Fluke ScopeMeter 123 Service Manual

12. Press
The test tool shows the display test pattern shown in Figure 4-1, at default contrast.
Observe the test pattern closely, and verify that the no pixels with abnormal contrast
are present in the display pattern squares. Also verify that the contrast of the upper
left and upper right square of the test pattern are equal.
13. Press
The test pattern is removed; the test tool shows
14. Press
The test tool shows a light display; the test pattern as shown in Figure 4-1 may not be
visible or hardly visible.
Observe the display closely, and verify that no dark pixels are shown.
15. Turn the test tool OFF and ON to exit the calibration menu and to return to the
normal operating mode.

4.5 Input A and Input B Tests

Before performing the Input A and Input B tests, the test tool must be set in a defined
state, by performing a RESET.
Proceed as follows to reset the test tool:
•
Press
•
Press and hold
•
Press and release
Wait until the test tool has beeped twice, and then release
beeped twice, the RESET was successful.
For most tests, you must turn Input B on. Input A is always on.
Proceed as follows to turn Input B on:
•
Press
•
Using
•
Press
from the next item group will be highlighted (for example I
after leaving the menu.
•
Press
During verification you must open menus, and to choose items from the menu.
Proceed as follows to make choices in a menu (see Figure 4.2):
•
Open the menu, for example press
•
Press
•
Press
Item groups in a menu are separated by a vertical line.
•
After pressing
(CAL) .
.
(CAL) .
to turn the test tool off.
.
to turn the test tool on.
to open the Meter B menu.
select
INPUT B:
to confirm the selection; the
to exit the menu.
to highlight the item to be selected in a menu.
to confirm the selection and to jump to the next item group (if present).
in the last menu item group, the menu is closed.
Contrast (CL 0120):MANUAL
.
ON
mark changes to I . The active setting
.
Performance Verification

4.5 Input A and Input B Tests

. When the test tool has
.
), and maintained
VAC
4
4-5