Acquisition Board Trouble Isolation; Scope Self Tests - Keysight Infiniium 9000 Series Service Manual

4
Troubleshooting

Acquisition Board Trouble Isolation

If an acquisition board has been removed by a prior procedure, reinstall it.

Scope Self Tests

Power up the oscilloscope and then go under Utilities > Self Test. Select the Scope
Self Test option from the Self Test pull-down menu and then press the Start Test
button. If one of these tests fails and mentions what channel the failure occurred
on, replace the acquisition board.
If the error message does not mention a channel, then refer to the discussions
below for the test that failed to see what the test is testing.
Vertical Test Group
• Front End DAC Linearity Test - This test verifies the linearity of each channel's
• Front End DAC MaxMin Test - This test measures the minimum and maximum
• Otter Register - This test verifies that all of the Otter preamp registers can be
• Overload - This test simulates an overload condition on each channel and
Trigger Test Group
• Trigger Lvl DAC Test - This test has not been implemented yet and currently
Timebase Test Group
• Timebase Interpolator Test - This test validates the timebase interpolator
82
front end DAC. If the test finds a problem, it will report a failure for the DAC on
the associated channel.
output voltage values of each channel's front end DAC. If the test measures any
values that are out of the range of expected values, it will report a failure for the
DAC on the associated channel.
correctly written to and read from. If this test reads any registers whose values
are not equal to what they were written to, it will report a failure for the preamp
on the associated channel.
verifies that when such a condition exists it immediately generates an interrupt
to the host processor. If such a condition is not detected properly, the test will
report a failure for the associated channel.
does nothing.
hardware by verifying that it is able to produce unique values for different
trigger settings. If this test fails, there may be a problem with the timebase
interpolator IC. However, this test has many other hardware dependencies so a
failure from this test cannot necessarily be associated with any specific
hardware failure. Try replacing the acquisition board and see if the test will then
pass.
Infiniium 9000 Series Oscilloscopes Service Guide