Tektronix 7B80 Instruction Manual page 24

Option 2-7680 Operators
OPTION 2
This option provides a means to obtain an X-Y display. The horizontal and vertical (X-Y) signals are applied to the inputs of a
dual-trace amplifier unit, or two single amplifier units. The horizontal signal is then routed through the amplifier and main-
frame trigger paths to the Option 2 instrument. The front-panel DISPLAY MODE switch selects either normal sweep displays
or X-Y displays. A functional description of the X-Y display feature will follow.
OPERATING INSTRUCTIONS
To make full use of the capabilities of this instrument, the operator should be familiar with the use of the front-panel DIS-
PLAY MODE push-button switch. A brief description of the DISPLAY MODE switch is given here. More detailed information
is given under the topic General Operating Information (later in this section).
DISPLAY MODE CONTROL
Figure 1 shows the location of the front-panel DISPLAY
MODE switch relative to the standard front-panel controls.
Only the functions of the Option 2 instrument DISPLAY
MODE switch are explained here; see Section 1, Operating
Instructions in this manual for a description of the standard
instrument controls.
FUlUCTlONAL CHECK
The following procedure checks the basic operation of the
X-Y functions and is intended t o supplement the Function-
al Check procedure given in Section 1 of this manual.
Setup Procedure
1. Install the Option 2 instrument in a horizontal compart-
ment of the mainframe.
DUAL-TRACE AMPLIFIERS. Set the vertical display
mode controls of both the amplifier and mainframe to
select the Y (vertical) signal;
set
the trigger source co~trols
of both the amplifier and mainframe to select the X (hori-
zontal) signal.
SINGLE-TRACE AMPLIFIERS. Set the vertical display
mode of the mainframe to select the Y (vertical) signal. Set
the mainframe trigger source to select the X (horizontal)
signal.
3.
Set each amplifier unit input coupling switch to dc, and
set the position controls of the selected X and Y channels
for a spot display at graticule center. Notice that the posi-
tion control of the Y channel controls Y-axis (vertical) spot
movement and that the position control of the X channel
controls X-axis (horizontal) spot movement.
2. Install a dual-trace amplifier unit in the desired vertical
compartment, or install single amplifier units in verti-
4. Connect a low-frequency sine-wave signal to the selected
cal compartment of the mainframe.
X and Y inputs.
3.
Turn on the mainframe power
X-Y Display
1. Set the DISPLAY MODE push button to X-Y. Set the
mainframe intensity control for convenient brightness of
the displayed spot.
2. Any available vertical channels may be used for the X
and Y signal inputs.
5. Adjust the mainframe intensity control until the display
is at the desired viewing level. Adjust the signal amplitude
for a convenient display size with the X and Y amplifiers set
for the same deflection factor.
6. If one signal source is connected to both the X and Y
amplifier units, the resultant display should be a diagonal
line on the mainframe crt.
Scans by ArtekMedia O 2006
Option 2-Page 1