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TAS 455 and TAS 465 Service Manual
4Ć3
Brief Performance Checks
This section contains three brief procedures: two that verify the operation of
the TAS 455 and TAS 465 Analog Oscilloscopes and one to perform a brief
calibration to compensate for temperature variances.
The PowerĆOn 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 powerĆon diagnostics passed by confirmĆ
ing no error messages are reported on screen.
The purpose of these procedures is to confirm that this oscilloscope funcĆ
tions properly. The only equipment required is a standardĆaccessory probe.
These procedures verify function; that is, they verify that the oscilloĆ
scope operates. They do not verify that it operates within limits.
Therefore, when the functional tests that follow instruct you to verify
that a signal appears on screen that is about five divisions in ampliĆ
tude" 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 4Ć13.
DO NOT make changes to the frontĆpanel 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.
PowerĆOn Self Tests
Functional Tests