Tektronix 7834

Operating Instructions-7834
FOUR-TRACE .
Two dual-channel amplifiers can display
four separate
signals . If one time-base unit is
used, all four
signals will be displayed at the same
sweep rate .
Time-Base Plug-In Units
The 7834 is compatible
with time-base units of the 71370,
71380 and 71390
Series . Sweep rates and triggering ranges
should be taken into
consideration when selecting time-base
plug-in units .
To obtain a
delayed-sweep display, a delaying time-base
unit must
be installed in the A HORIZ compartment and
a
delayed
time-base unit installed in the B HORIZ compart-
ment . A delayed-sweep
display can also be obtained with
one horizontal
plug-in unit in either horizontal compartment
if a dual
time-base unit is used . This leaves the other
horizontal
compartment available for other plug-in units as
suggested later
in this section .
The 71350-Series
time-base units are not recommended for
use with this
instrument because they require a longer
delay
line than
is used in the 7834 . Therefore, the triggering
event
may not appear on the display .
Sampling Displays
Sampling-system
plug-in units for the 7000-Series oscillo-
scopes
provide displays of fast-changing signals that
cannot
be
examined using any other method . For example,
sampling systems available for the 7834 can
resolve
repetitive signals having less than 10
millivolts of peak
amplitude and occurring in less than 1
nanosecond .
The technique used for sampling is
very similar in principle
to the use of stroboscopic
light to study fast motion .
Samples of successive
waveforms are taken, amplified by a
relatively low-bandwidth
amplifier, and then displayed on
the crt as a replica of
the sampled waveforms .
Three
sampling systems are available at this time for the
7834 : (1) the
7512, which provides time-domain-reflect-
ometry displays for
general-purpose measurements, (2) the
7S11/7T11 system and (3)
the 7S14, a dual-channel vertical
sampling system,
including main and delayed sweep
functions . See the
Tektronix Products catalog to determine
the characteristics of
the individual units mentioned and of
additional units
made available after this manual is
published .
SINGLE-TRACE SAMPLING . A single-trace sampling
display requires either a double-width 7512 (which
includes
a time-base), or the 7S11 sampling unit and
the
7T11
sampling sweep unit . Direct interconnections
between the
2- 22
7S11 and the 7T11 require these
units to be adjacent, with
the 7S11 in the RIGHT
VERT compartment and the 7T11
in the A HORIZ
compartment . If either the 7S12 or the
7514 is used, it
must be located in the middle two
compart-
ments to make
the proper connections with the 7834
.
DUAL-TRACE SAMPLING . Two 7S1 1's
can be used with
a
single sampling time-base unit for
time-related displays
of
two signals . Direct interconnections from
the LEFT
VERT 7S11 pass
through the RIGHT VERT
7S11 to reach
the A HORIZ time-base unit .
The 7514 is a dual-channel sampling unit
with delaying
sweep capability . It must be used in the
middle two plug-in
compartments .
Dual-trace sampling displays can also be
made by a 7S12 in
the middle two compartments and a 7S11
in the LEFT
VERT compartment . In this application,
the 7S12 supplies
the time-base for both traces .
X-Y SAMPLING . One 7S11
inserted in the RIGHT VERT
compartment and
one in the adjacent A HORIZ compart-
ment automatically
share a 50 kilohertz free-running strobe
condition
specified for X-Y displays . The 7S14 has an X-Y
operation incorporated as one of its normal
mode functions .
Special Purpose Plug-In Units
The variety of
special-purpose plug-in units available allows
the 7834
Oscilloscope to be used for many specialized
applications .
The following is a brief discussion of some of
the available
special-purpose plug-in units .
DIGITAL COUNTERS AND MULTIMETER
PLUG-IN
UNITS . The digital-multimeter plug-in units
measure
current, voltage, temperature, and resistance ;
cligital-
frequency-counter plug-in units measure
frequency, from
do to above 500 MHz . These units make use of
the readout
system to display the measured information on
the crt and
can function in any compartment, in combination
with
each other or with any other plug-in units available for use
with
the 7834 oscilloscope system .
The ability of digital readout plug-in units to operate
with
other plug-in units makes it possible to process and
monitor
signals at the same time the digital measurement is
being
made . For example, by locating a frequency counter
in one
of
the vertical compartments and an amplifier
unit in the
other vertical compartment, the crt can
display the trigger
waveform, superimposed
on the displayed signal, to
indicate the actual
triggering point . Or, if the counter is
placed in a horizontal
compartment, a low-amplitude signal