Tektronix 7834 User Manual

Operating Instructions-7834
The
+
GATE OUT connector provides a positive-going
rectangular pulse which is derived from a time-base unit
installed in either horizontal plug-in compartment . The
+
GATE OUT signal can be selected from the time-base unit
installed in the A HORIZ compartment or B HORIZ com-
partment . Refer such selection to qualified service personnel
only . The duration of the + GATE OUT signal is the same
as the duration of the respective sweep or, in the case of the
delayed gate, it starts at the end of the delay period and
lasts until the end of the sweep from the delaying time-base
unit . Amplitude of the output signal at the
+
GATE OUT
connector is about 0 .5 volt into 50 ohms or about 10 volts
into 1 megohm .
VERTICAL SIGNAL . The VERT SIG OUT connector
provides a sample of the vertical deflection signal . The
source
of
the
output signal at this connector is
determined
by the
A TRIGGER SOURCE switch
.
In the VERT MODE
position of the A TRIGGER SOURCE switch, the output
signal is determined by the setting of the VERTICAL
MODE switch . The output signal in the LEFT and RIGHT
positions of the VERTICAL MODE switch is obtained only
from the selected vertical unit . In the ALT position of the
VERTICAL MODE switch, the output signal at the VERT
SIG OUT connector switches between signals from the two
vertical
units,
along
with the crt display .
However, the
vertical output signal in the CHOP position is a composite
signal and is the same as that obtained in the ADD position
due to the requirements of
the triggering
system . The
LEFT
VERT and RIGHT VERT
positions of
the A TRIGGER
SOURCE switch are independent
of
the selection
of
the
VERTICAL MODE switch and provide
the
vertical
output
signal only from the selected vertical
unit
even
when it
is
not selected for display .
The
output voltage into a 50 ohm load is about 25 milli-
volts/division of crt display and about 0 .5 volt/division of
display into a 1 megohm
load .
The
output signal frequencies
are determined by the vertical plug-in
unit used (see Systems
Specification
in the General Information section) .
PROBE POWER . The two PROBE
POWER
connectors
on
the rear panel of this instrument provide operating power
for active probe systems . It is not recommended that these
connectors be used as a power source for applications other
than the compatible probes or other accessories which are
specifically designed for use with this system . (Option 1
deletes these PROBE POWER
connectors from the
instrument) .
Display Photography
A permanent record of the crt display can be obtained with
an oscilloscope camera system . The instruction manual for
the
Tektronix Oscilloscope Cameras includes complete
instructions for obtaining waveform photographs .
2- 2 0
The crt bezel provides integral mounting for Tektronix
Oscilloscope Cameras . The three pins located on the left
side of the crt bezel connect power to compatible camera
systems . Control signals are also received from Tektronix
automatic cameras to allow camera-controlled single-shot
photography (see camera manual for further information) .
If the readout portion of the display is to be included on
waveform photographs, the following suggestions will aid
in obtaining good photographs .
1 . Focus the oscilloscope display and the camera on the
readout portion of the crt display . The auto-focus feature
in this instrument will maintain the traces at optimum
focus .
2 . Set the READOUT intensity control for the minimum
setting that allows the characters to be written . This
normally occurs at a slightly lower intensity level than is
necessary for complete writing of the waveform display .
Some experimentation may be necessary to establish the
correct level . Too high a setting of the READOUT intensity
control will result
in
a broad, poorly defined photograph of
the readout display .
3 . If single-shot
photography is used, set
the READOUT
FREE RUN or GATED switch to the GATED position (see
Readout Display for complete operating information) .
Then, the readout is displayed in a single-shot manner after
the trace is complete (be sure the camera shutter remains
open at least 0 .5 second after the sweep is completed to
photograph the entire readout) . Also, set the GRAT
ILLUM control counterclockwise while the trace is being
photographed . Then, the graticule can be photographed
later to produce a double-exposed picture showing the
complete information .
Intensity Modulation
Intensity (Z-axis) modulation can be used to relate
a
third
item of electrical phenomena to the vertical (Y-axis) and
the horizontal (X-axis) coordinates without affecting the
waveshape of the displayed signal . This is accomplished by
changing the intensity of the displayed waveform to
provide
a "gray scale" display .
The voltage amplitude required
for
visible
trace modulation
depends on the setting of the A and B INTENSITY
controls . A two-volt peak-to-peak signal will completely
blank the display even at maximum intensity levels ; lower
amplitude signals can be used to change only the relative
trace brightness . Negative-going signals increase the display
intensity and positive-going signals decrease the display
intensity .

Tektronix 7834 Specifications

General

Brand	Tektronix
Model	7834
Category	Test Equipment
Language	English