Tektronix 684A User Manual

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

Before doing service, read the following operating instructions. These instruc-
tions are at the level appropriate for servicing these Digitizing Oscilloscopes.
The User Manual contains more complete operating instructions.

Additional instructions are integrated into the service procedures found in later
sections of this manual. For instance, the procedures found in the section
Performance Verification contain instructions for making the front-panel settings
required to check each instrument characteristic included there. Also, the general
instructions for operating these Digitizing Oscilloscopes’ internal diagnostic
routines are found in Section 6, Maintenance. You may also find the Product
Description in Section 1 useful for understanding how the oscilloscope
functions.

Figure 2–1 on page 2–8 shows the screen layout. This figure illustrates a full
graticule. You may also select a grid, crosshair, or frame graticule from the
display menu.

Push the principal power switch found on the rear panel of the oscilloscope, then
push the ON/STBY (standby) switch to toggle the oscilloscope into operation.
The switch at the rear panel is the true power disconnect switch. The ON/
STBY(standby) switch simply toggles operation on and off.

WARNING. The principal power switch at the rear panel is the true power
disconnect switch. The ON/STBY (standby) switch simply toggles operation on
and off. When connected to a power source and when the principal power switch
is on, the internal power supplies and much of the other circuitry of these
Digitizing Oscilloscopes are energized regardless of the setting of the ON/STBY
switch.