Tektronix 684A User Manual

Performance Tests

TDS 684A, TDS 744A, & TDS 784A Service Manual

These procedures check those characteristics that relate to the signal-acquisition
system and are listed as checked under Warranted Characteristics in Specifica-
tions.

None

The oscilloscope must meet the prerequisites listed on page 4–15

1. Preset the instrument controls:

a. Initialize the oscilloscope:

H Press save/recall SETUP.

H Press the main-menu button Recall Factory Setup.

H Press the side-menu button OK Confirm Factory Init.

H Press CLEAR MENU to remove the menus from the screen.

b. Modify the default settings:

H Press SHIFT; then press ACQUIRE MENU.

H On the TDS 684A, press the main-menu button Mode; then press

the side-menu button Average 16.

H On the TDS 7XXA, press the main-menu button Mode; then press

the side-menu button Hi Res.

H Press CURSOR.

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

button H Bars.

H Press CLEAR MENU.

H Be sure to disconnect any input signals from all four channels.

2. Confirm input channels are within limits for offset accuracy at zero offset:

Do the following substeps — test CH 1 first, skipping substep a since CH 1
is already set up to be checked from step 1.

a. Select an unchecked channel: Press WAVEFORM OFF to remove the

channel just confirmed from the display. Then, press the front-panel
button that corresponds to the channel you are to confirm.