Making Measurements
Using the Selftest Functions
3
Test Key
Press the
Test key to display the TEST menu, from which you can choose to perform a
variety of selftests.
adj126f.eps
TEST Menu
The TEST menu allows you to initiate front panel display and key tests and ‘Circuit’ test.
Please note that the instrument should be allowed a warm up period of 10 minutes before
performing an internal self test and that ambient temperature should be between 15
o
C
and 35
o
C.
Press any key other than Test to step both displays through a sequence of
'walking strobes', which allow you to inspect segments and complete
blocks.
Press
Test during the Disp checks to terminate the display test.
Press Keys to test all keys other than Test. The key's hexadecimal matrix
osition appears
o the left of a colon; to the right of the colon an S is
followed by the key's switch number, and the name of the key is given on
the right of the display.
Press
Test during the Key checks to terminate the key test.
Press to start a selftest and disable all other function keys, signal inputs and
normal trigger sources.
While selftest is running the display shows a reference number of the test
currently being performed.
A fail indicator (?) may be added to the display, and this will persist to the
end of the test sequence. Press the
Abort key to stop the test. In the TEST
ABORT
and TEST UNSUCCESSFUL menus, repeatedly pressing the List
key reads out the failures in turn. The memory of each failure is lost as it is
read.
Appendix A contains a list of the failure-message numbers.
Note
The success of Selftest can be inhibited by:
Temperature not in the range: 5 °C to 40 °C, and
presence of excessive RFI or Line noise.
3-39
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