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Performance Tests

4-26

TDS 420A, TDS 430A & TDS 460A Service Manual

H Press SHIFT; then ACQUIRE MENU.

H Press the main-menu button Mode; then press the side-menu button

Average 16.

H Press Measure. Now press the main-menu button High--Low S etup;

then press the side-menu button Min--Max.

Digitizing Oscilloscope

Sine Wave

Generator

Output

Figure 4- 6: Initial Test Hookup

NOTE. Refer to the Sine Wave Generator Leveling Procedure on page 4--55 if

your sine wave generator does not have automatic output amplitude leveling.

c. Hook up the test-signal source:

H Connect the sine wave output of a sine wave generator to CH 1 (see

Figure 4--6). Set the output of the generator to a reference frequency

of 10 MHz or less.

H Set the horizontal SCALE to 50 ns. (If using a reference other than

10 MHz, adjust the horizontal SCALE todisplay4to6cyclesof

the waveform.)

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 leveled output of the sine wave generator to the channel

you select.

Tektronix TDS 420A Service Manual

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