Self Test Routine At Power Up
The following sequence occurs during the automatic self
test of the Series 4400 system when main power is ap-
plied. Monitor this routine closely, as it provides assur-
ance of the reliability of the system before proceeding
with test programs. (Refer to page 4-23 for details of
this feature and user interaction.)
(a) Turn instrument on. Scan all sections of the Front
Panel during the Self Test Routine and observe the
following action:
(1) All LEDs light, including the control switches
and backlit status indicators, and all displays
show “-1.8888” for up to 10 seconds.
(2) All LEDs go out and all displays are blank for up
to 5 seconds.
(3) The Self Test Result shows on Main Panel Dis-
play for up to 5 seconds, then disappears (see
Note below). If the Self Test Result remains on
the display, then the system cannot be operated
and corrective maintenance is required.
Note
You can repeat the Self Test Routine by pressing
the Reject key (REJ) on the keypad during thetime
whentheSelfTest Result showsonthe MainPanel
Display. This allows you to observe the LED test
again, and, if a fault condition is random or spuri-
ous, may allow a Self Test Routine to pass a
second try. If a second try is required often, it
could indicate a marginal condition oran intermit-
tent failure.
System
Operation
Self Test Routine At Power Up
5-5
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