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Operation

FRONT PANEL ORGANIZATION

The front panel on the 2225 is organized to make it easy for you to

set up displays and make measurements. Referring to the foldout

illustration at the front of this manual, or to the oscilloscope itself,

notice that the front panel is partitioned into four major control

sections— Display, VERTICAL, HORIZONTAL, and TRIGGER.

Just to the right of the cathode-ray tube (crt) screen are the Dis

play controls. They are used to adjust brightness and focus of the

trace, to align the trace horizontally, and to help you find off

screen signals quickly. These controls affect the display, but not

the waveform.

Like any oscilloscope, the 2225 draws a graph of voltage as a

function of time. The VERTICAL section, enclosed within shaded

gray lines, contain the controls that define the voltage (or vertical)

axis of the display. Also a part of this section are the two BNC

input connectors, which are used to apply the signals that you

want to view.

The HORIZONTAL controls are to the right of the VERTICAL sec

tion. They are used to set and move the time (or horizontal) axis

for the displayed traces.

On the extreme right of the front panel, enclosed within shaded

green lines, is the TRIGGER section. Trigger controls define the

signals and the conditions that are needed to initiate (or trigger)

every sweep across the time axis. An indicator light shows

whether the sweep is validly triggered or not. At the bottom of the

TRIGGER section is a BNC input connector that can be used to

apply either an external trigger signal or an external Z-axis (dis

play intensity) control signal.

CONTROLS, CONNECTORS, AND INDICATORS

Table 2-1 gives you a summary of all the controls, connectors, and

indicators on your 2225 Oscilloscope. Following the table is a

short procedure describing how to get a display. The remainder

of this section offers suggestions and tips for using the controls to

obtain the most effective displays and to make the most accurate

measurements.

2225 Operators

2-1

Tektronix 2225 User Manual

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