Tektronix T921 User Manual

This description includes the operation
and
maintenance of the added features of
Option 1 . For
all otherinformation concerning the
T922 or T922R,
refer to
the appropriate section of this
manual .
Schematic
Diagrams for Option 1 are included at the
end of the Diagrams
section in this manual .
Introduction
NOTE
OPERATING
INFORMATION
The T922
or T922R Option 1 includes a fourth vertical
mode pushbutton
(labeled DIFF) which, when pressed in
alone, inverts the CH 2 signal
and displays the sum of the
CH 1 and CH 2 signals . (If the
DUAL TRACE button is
pressed
along with the DIFF button,
CH
2
is inverted and
each signal
is displayed but not summed .) The
algebraic
sum (difference)
of the CH 1 and CH 2 signals is a
useful
feature for rejecting unwanted
common-mode signals
such as line-frequency components
. The DIFF button may
Option 1
Vertical Modes
(button
in and display normal unless otherwise
stated)
Options-T921/T922/T922R
T922/T922R OPTION 1
DIFFERENTIAL MODE
also be used in conjunction with other mode buttons to
provide a variety of modes as shown in the table .
DIFF Mode Operation
To operate the instrument in the DIFF mode, perform
the appropriate
First Time Operation steps in Section 2 of
this manual,
then :
1 . Connect the signal
you wish to view to CH 1 input .
2 . Connect a sample of the
unwanted signal to CH 2
input .
3 . Set : Vertical Mode

DIFF
SOURCE

For desired trigger
condition
4 . Adjust the CH 1 and CH
2 VOLTS/DIV and VAR
controls to obtain the desired
display (null of common-
mode signal) .
Option 1 Page
1
Vertical
Mode Bu tton Displayed Signal
Internal Trigger Source
DIFF & CH 2 __
CH 2 Inverted
CH 2
DUAL TRACE & DIFF
CH 1 and Inverted CH 2
CH 1
DUAL TRACE, DI FF ,& CH
_2__
CH 1 and
Inverted CH 2
__
CH 2
DUAL TRACE
& CH 2 CH 1 and CH 2
CH 2
CH 1 , & CH 2
CH 1 & CH 2 Alternate
_
CH 2
DI FF
Differential ( CH 1 - CH 2)
CH 1
All
Buttons Out
CH 1 & CH 2 A dded
CH
1

Tektronix T921 Specifications

General

Brand	Tektronix
Model	T921
Category	Test Equipment
Language	English