222
DSO Operators-How It Works
r
GND EXT TRIG:
CAL
Press
CAL~
to start the External Trigger self calibration
routine when the
UCT
TRIG
COMM
and
EXT
TRIG INPUT con-
nectors are joined. A PASSIFAIL message is displayed when
the routine is done.
Press the
button at the completion of the self calibration
routines to return to normal oscilloscope operation.
If a self calibration step fails, the currently stored calibration con-
stants are not changed. Rerun the failed routine again. If the failure
persists, refer the oscilloscope to a qualified service person.
A coded error message is output when an error occurs. Further infor-
mation about the nature of the failure may be found by connecting the
RS-232 interface port to a terminal and rerunning the failed self cali-
bration routine. See Section
7
of this manual or the RS-232 lnterface
Guide for the part number of the interconnection cable required.
Tables and other information needed to decode the error messages
are in the RS-232 Interface Guide.
REV
JUN
1989
4-29
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