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Option 2-7880 Operators
The advantages of using the internal triggering system to
provide the X signal are:
1. X-Y operation
is possible with one dual-trace amplifier
in a mainframe vertical compartment.
2. X-Y operation is possible without having to remove a
time-base unit from the horizontal compartment of the
mainframe to substitute an amplifier unit.
3. The attenuator switch of the vertical channel in the hori-
zontal signal path provides many deflection-factor settings
to allow full-range amplitude control.
OPERATION WlTH DUAL-TRACE AMPLIFIERS. When
dual-trace amplifier units are used with the Option 2 Time-
Base unit, any vertical channel may be used for X or Y
signal inputs. Set the display mode controls of both the
amplifier and mainframe to select the channel that provides
the vertical signal;
set
the trigger source controls of both
the amplifier and mainframe to select the channel that pro-
vides the horizontal signal.
OPERATION WlTH SINGLE-'TRACE AMPLIFIERS. If
single-trace amplifier units are used with the Option 2
Time-Base unit, set the mainframe trigger source control to
select the amplifier unit that provides the horizontal signal;
set the mainframe vertical mode control t o select the ampli-
fier unit that provides the vertical signal.
APPLICATIONS
The following information describes a procedure or tech-
nique for making X-Y phase measurements with the Option
2 Time-Base unit. The measurements are described in a de-
tailed example, but each user application must be adapted
to the requirements of the individual measurement. The
following X-Y phase measurement method can be used to
measure the phase angle between two signals of the same
frequency.
Preliminary Setup
1. Set the DISPLAY MODE push button to the OUT: X-Y
position. Set the mainframe intensity control for con-
venient brightness of the spot display.
2. Set the controls of the mainframe and the amplifier
units a s directed in the following setup procedure for the
amplifier units to be used.
DUAL-TRACE AMPLIFIERS.
Set the vertical display
mode controls of both the amplifier and mainframe to
select the input of the Y (vertical) signal; set the trigger
source controls of both the amplifier and mainframe to se-
lect the input of the X (horizontal) signal.
SINGLE-TRACE AMPLIFIERS. Set the vertical display
mode control of the mainframe to select the input of the
Y (vertical) signal;
set
the trigger source control of the
mainframe to select the input of 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.
4. Connect low-frequency sine-wave signals of the same fre-
quency to the selected X and Y inputs.
5. Advance the mainframe intensity control until the dis-
play is a t the desired viewing level. Set the amplifier deflec-
tion factors and variable volts/division controls for eight
divisions of vertical and horizontal deflection, and set the
position controls to center the display on the graticule a s
shown in Figure 2.
6. Measure and record the overall horizontal deflection (B)
and the opening of the Lissajous display (A), measuring
horizontally at the graticule horizontal center line (see
Figure 2).
Figure 2. Measurement of phase angle difference
from an X-Y display.
Option 2-Page 3
Scans by ArtekMedia O 2006
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