Brief Procedures
4-8
TDS 420A, TDS 430A & TDS 460A Service Manual
STOP. These procedures verify functions; that is, they verify that oscilloscope
features operate. They do not verify that they operate 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,” and so forth, do NOT interpret the
quantities given as limits. Operation within limits is checked in Performance
Tests, which begin on page 4--15.
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
settings, other than those called out in the procedure, you may obtain invalid
results. In this case, just redo the procedure from step 1.
When you are instructed to press a menu button, the button may already be
selected (its label w ill be highlighted). If this is the case, it is not necessary to
press the button.
Equipment
Required
One P6138A probe
Prerequisites None
1. Install the test hookup and preset the oscilloscope controls:
Digitizing Oscilloscope
Figure 4- 3: Universal Test Hookup for Functional Tests
a. Hook up the signal source: Install the probe on CH 1. Connect the probe
tip to PROBE ADJ on the front panel; leave the probe
ground unconnected.
Verify All Input Channels
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