Brief Procedures
TDS 420A, TDS 430A & TDS 460A Service Manual
4-7
You must run an SPC anytime you wish to ensure that the measurements you
make are made with the most accuracy possible. You should also run an SPC if
the temperature has changed more than 5_ C since the last SPC was performed.
f. Run the signal path compensation: Disconnect all input signals. Press
the main-menu button Signal Path; then press the side-menu button OK
Compensate Signal Paths.
NOTE. Failure to run the signal path compensation may result in the oscilloscope
not meeting warranted performance levels.
g. Wait: signal path compensation runs in one to three minutes. While it
progresses, a “clock” icon (shown at left) displays on screen. When
compensation completes, the status message updates to Pass or Fail in
themainmenu(seesteph).
h. Confirm signal path compensation returns passed status: Verify the
word Pass appears under Signal Path in the main menu. (See
Figure 4--2.)
2. Return to regular service: Press CLEAR MENU to exit the system menus.
Functional Tests
The purpose of these procedures is to confirm that this oscilloscope functions
properly. The only equipment required is one of the standard-accessory probes
and a 3.5
I, 720 K or 1.44 Mbyte floppy disk.
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