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Adjustment Procedures

5-14

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

d. Modify the initialized front-panel control settings:

H Press Autoset.

H Set the vertical SCALE to 100 mV.

H Set the horizontal SCALE to 100 ns. (If you use a reference

frequency other than 10 MHz, set the horizontal SCALE to display

5 to 7 cycles of the waveform.)

H Press SHIFT.ThenpressACQUIRE MENU.

H Press the main-menu button Mode. Then press the side-menu button

Hi Res.

H Press MEASURE.

H Press the main-menu button Hi-Low Setup. Then press the

side-menu button Min-Max.

H Press the main-menu button Select Measurement for Ch1.

H Repeatedly press the side-menu button -- m o r e -- until Pk-Pk appears

in the side menu. Press the side-menu button Pk-Pk.

H Press CLEAR MENU.

2. Confirm probe bandwidth:

a. Display and measure the test signal:

H Monitor the CH 1 Pk-Pk readout while you set the output of the

generator for a 600 mV (6 division), 10 MHz or less

reference signal.

H (TDS 420A Only) Set the horizontal SCALE to 2 ns and set the

frequency of the generator to 200 MHz.

H (TDS 430A and TDS 460A Only) Set the horizontal SCALE to1ns

and set the frequency of the generator to 400 MHz.

H Read the measurement results at the CH 1 Pk-Pk readout on screen.

b. Check against limits: CHECK that the CH 1 Pk-Pk readout is greater

than or equal to 420 mV.

3. Disconnect the hookup:

a. Unplug the probe from the BNC to probe tip adapter.

b. If substep 2b was passed, the probe adjustment is finished. Reverse the

instructions in Figure 5--4, page 5--13, to reinstall the retractable hook

probe tip.

Tektronix TDS 420A Service Manual

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