Adjustment Procedures
5-18
TDS 420A, TDS 430A & TDS 460A Service Manual
Pulse Generator
Digitizing Oscilloscope
BNC Female to
BNC Female
Adapter
BNC to Probe
Tip Adapter
Output
Pulse Generator
Head
Figure 5- 8: Probe Test Hookup
H Press MORE. Then push the main-menu button Ref 1.
b.
Display the test signal:
H Disconnect the pulse generator head at CH 1 and remove the
10X attenuator.
H Connect the output of the pulse generator head through a BNC
female to BNC female adapter to a BNC to probe tip adapter.
H Install the probe on CH 1.
H Plug the probe tip from the probe into the BNC to probe tip adapter.
H Press the main-menu button Coupling. Then press the side-menu
button Ω to toggle to 1 MΩ coupling.
H Press HORIZONTAL MENU.
H Press the main-menu button Trigger Position; press the side-menu
button 10%.
c.
Make the adjus tments:
H Locate the various adjustments in Figure 5--9.
H Manually adjust the front-corner response of the probe to best match
the response of the Ref 1 waveform. Note that it is more important
to match the response during the first 5 ns than during the entire first
20 ns the adjustments affect.
H See Figure 5--10 to see what areas on the front corner that the
various adjustments affect.
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