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Power-On Self Tests
Functional Tests
Brief Performance Checks
This section contains three brief procedures: two that verify the operation
of
the
TAS
475 and
TAS
485 Analog Oscilloscopes and one to perform a brief
calibration to compensate for temperature variances.
The
Power-On Self
Tests
use internal routines (performed at each power on)
to confirm basic functionality and proper adjustment.
The
Functional
Tests
further verify that the oscilloscope functions properly.
These tests utilize the front panel PROBE COMP signal and a standard
accessory probe.
The
Temperature Compensation Calibrations use internal routines and
actions from you to adjust the
display accuracy of the oscilloscope. These
adjustments are
typically necessary only when the operating temperature
and the
last calibration temperature varies more than 5°
C.
However,
performing these compensations before making a
critical measurement
ensures optimum accuracy.
If any of these tests return a failed message or
do
not perform
as
stated,
contact your
local Tektronix service center or sales engineer for more
information.
These tests verify that the
internal power-on diagnostics passed by confirm-
ing no error messages are reported on-screen.
The purpose of these procedures
is
to
confirm that this oscilloscope func-
tions
properly. The only equipment required is a standard accessory probe.
These procedures verify function; that
is,
they verify that oscillo-
scope operates. They do
not
verify that it operates within limits.
Therefore, when the instructions
in
the functional tests that follow
call
for you to verify that a signal appears on screen "that
is
about
five divisions in
amplitude"
or
"has a period
of
about six horizontal
divisions",
do
not
interpret the quantities given
as
limits. Operation
within limits
is
checked
in
Performance
Tests,
which begin on
page 4-13.
DO
NOT make changes to the front-panel settings that are not
called out
in
the procedures. Each verification procedure requires
you to set the
oscilloscope to certain default settings before verifying
functions.
If you make changes to these default settings, other than
those
called out in the procedure, you may obtain invalid results.
In
this case, begin the procedure again from step 1 .
TAS 475 and TAS 485 Service Manual
4-3
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