Controls
Internal Self-Tests
The test programs forming the self-diagnosis
can be activated from the front panel as fol-
lows:
Select one of the six tests available by
pressing the softkey below the label with
the name of the test function. Five of the
tests (RAM, ROM, Logic, Display, and
Interface) are individual. They are briefly
described below. The sixth, named All,
performs all five individual tests in se-
quence.
All - all tests performed in sequence
Logic - test of counter ASIC and other logic
circuits.
Display - test of graphic display module
Interface - test of GPIB and USB
If a fault is detected, an error message ap-
pears on the display and the program
halts. Note any error messages.
If no faults are detected, the instrument
returns to the normal measurement mode.
This test verifies that the timer/counter re-
sponds when you press any key. It is not a
functional test. Such tests are performed later
in this chapter. The important thing here is
that something changes on the display when
you press a key. Consequently you can press
the keys in almost any order without paying
attention to the exact response, but for those
who want to be more systematic there is a ta-
ble overleaf, where all keys are exercised at
l
east once.
Press the keys as described in the first
column and look at the display for the text in
the second column. Some keys change more
text on the display than described here. The
display text mentioned here is the one mostly
associated with the selected key.
See table below for the complete list of
default settings.
NOTE: For the instrument to respond
correctly, this test must be carried out
in sequence, and you must start with
the DEFAULT setting. See page 2-16.
No signals should be applied to the
input connectors
USER MANUAL ● CNT 9x Series ● Rev.22 February 2020
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