Tektronix 7844, Инструкция по эксплуатации

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Operating I nstructions-7844/R7844 Operators
Output Signals
SAWTOOTH SIGNALS, The A SAWTOOTH connector pro­
vides a positive-going sawtooth signal derived from the time­
base unit installed in the A H O R I Z compartment and the B
SAWTOOTH connector provides a positive-going sawtooth
signal derived from the time-base u n i t installed in the B
H O R I Z compartment. The unit of time for the sawtooth
outputs is determined by the setting of the time-base unit
Time/Division switch. Refer to Table 2- 1 , i n the Specifica­
tion section, for signal parameters.
GATE S IGNALS, The A GATE connector provides an out­
put from the time-base unit in the A H O R I Z compartment
and the B GATE connector provides an output from the
time-base unit in the B H O R I Z compartment.
When the A or B GATE selector is set to M A l N, the output
is a positive-going gate signal derived from the d i splayed gate.
When the A or B GATE selector is set to D L Y'D, the output
is a positive-going gate signal derived from the delay gate of
those time-base units which furnish a delay gate. The out­
put is always positive when no plug-in u n i t is installed or the
plug-in u n'lt does not provide a delay gate. Refer to Table
2-1 in the Specification section and to the specifications in
the time-base unit instruction manual for signal parameters.
Display Photography
A permanent record of the crt display can be obtained with
an oscilloscope camera system. The instruction manuals for
the Tektronix osci l loscope cameras include compl et e instruc­
tions for obtaining waveform photographs.
The crt bezel provides integral mounting for a Tektronix
oscil l oscope camera. The 3 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 instruction manual for further information).
The 7844/R7844 provides readout and pulsed graticule
i l l u m i nation to aid in single-sweep photography. To activate
the pulsed functions, set the R EADOUT I NT E N S ITY and
G RAT I L LU M controls to the PU LSE D detent,
When both the R EADOUT and G RAT I L LU M EXT/BEAM
2 GATED switches are set to BEAM 2 GAT E D , one read­
out frame is displayed and the graticule i l l u m ination is turn­
ed on at the end of beam 2 sweep (be sure the camera
1 - 1 6
shutter remains open a t least 0 . 5 second after t h e sweep i s
completed t o photograph the readout display and t h e grati­
cule). The pulsed readout and graticule illumination func­
tions can also be actuated by an external signal applied to
the rear-panel G RAT/R EADOUT S I N G L E SHOT connector
or by the front-pane! MANUAL push buttons.
For more information on single-sweep and photographic
related functions, refer to the Graticu!e Illumination, Read­
out Display, Remote Grat/Readout Single Shot, Light F i l ­
ters, and Single Sweep I nput/Output discussions in this
section
NOTE
For instruments equipped with Option 22
(Photographic writing speed enhancer) refer to
Section 4.
APP L I CATIONS
The 7844 Oscilloscope and its associated plug-in units pro­
vide a very flexible measurement system. The capabil ities
of the overall system depend mainly upon the plug-in units
sel ected for use with this instrument. Specific applications
for the individual plug-in units are described in the plug-in
unit instruction manuals. The overall system can also be
used for many applications which are not described in de­
tai l , either in this manual or in the manuals for the individua!
plug-in units. Contact your Tektronix Field Office or repre­
sentative for assistance in making specific measurements
with this instrument.
The following books describe oscilloscope measurement
tech niques which can be adapted for use with this instru­
ment:
John D. Lenk, "Handbook of Osci l l oscopes, Theory,
and Application", Prentice-Hall Inc., Englewood
Cliffs, New Jersey, 1 968,
J. Czech, "Oscill oscope Measuring Techniques",
Springer-Verlag, New York, 1 965_
J. F. Golding, "Measuring Osci l l oscopes", Transat­
lantic Arts, I nc., 1 9 7 1 ,
Charles H. Roth Jr., "Use o f the Osci l l oscope", A
Programmed text, Prentice-Hall !nc., Englewood
CI iffs, New Jersey, 1 970.
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