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Performance Tests
4–34
TDS 684A, TDS 744A, & TDS 784A Service Manual
High Frequency
Sine Wave
Generator
Digitizing Oscilloscope
Output
Leveling Head
Figure 4–7: Initial Test Hookup
2. Confirm the input channels are within limits for analog bandwidth: Do the
following substeps — test CH 1 first, skipping substeps a and b since CH 1
is already set up for testing from step 1.
a. Select an unchecked channel:
H Press WAVEFORM OFF to remove the channel just confirmed
from display.
H Press the front-panel button that corresponds to the channel you are
to confirm.
H Move the leveling head to the channel you selected.
b. Match the trigger source to the channel selected:
H Press TRIGGER MENU. Press the main-menu button Source; then
press the side-menu button that corresponds to the channel selected.
c. Set its input impedance:
H Press VERTICAL MENU; then press the main-menu button
Coupling.
H Press the side-menu W button to toggle it to the 50 W setting.
d. Set the vertical scale: Set the vertical SCALE to one of the settings
listed in Table 4–4 not yet checked. (Start with the 100 mV setting.)