Tektronix 5441 Instruction Manual page 21

Left Right
Vertical Vertical Horizontal Horizontal
channel channel A or Main B or Delayed
Left Right External External
Vertical Vertical Word Word
Channel 2 Channel 2 (Channel) 1 (Channel) 2
\ f
External readout
information when
option is installed.
Fig. 2-2. Location of readout on the crt identifying the originat-
ing plug-in unit and channel (and external, if Option 03 is
installed).
the top and bottom divisions of the graticule are to be used
for waveform display, or when the trace interruptions neces-
sary to display characters do not allow a satisfactory wave-
form display to be obtained.
Option 03, Externally Programmed Seventh and
Eighth Readout Words
This option adds a 25-pin connector to the rear panel of
the display module, through which two ten-character read-
out words can be displayed on the crt, see Fig. 2-2.
Care of Storage Screen
The following precautions will prolong the useful storage
life of the crt screen used in this instrument.
1. Use the minimum beam intensity required to produce
a clear, well-defined display. A too-high beam intensity may
permanently damage the crt screen, particularly if a bright
spot is allowed to remain stationary on the display area.
2. Avoid repeated use of the same area of the screen. If
a particular display is being stored repeatedly, change the
vertical position occasionally to use other portions of the
display area.
Operating lnformation-5441/R5441
3. Do not leave a stored display on the screen when it is
no longer needed.
4. Operate the instrument in the non-store mode unless
storage is required.
Storage Operation
The storage feature greatly increases the versatility of
the 5441 Oscilloscope. The storage cathode-ray tube allows
a display to be retained for a longer period of time. When the
STORE button is out, the instrument operates as a conven-
tional oscilloscope.
When the STORE button is pressed in, the instrument
operates in a storage mode.
T ~ O
modes of storage are
available. They are Variable Persistence, where the
persistence of the crt is electrically controlled by the
VARIABLE PERSIST control; and a SAVE mode, that
allows longer retention of the displayed information. When
the SAVE button is pressed in, a lockout function prevents
accidental erasure of the stored display.
A stored display is erased by pressing the ERASE
switch. In the SAVE mode. the erase function is disabled.
Display Switching Logic
The electronic switching for time-shared displays is pro-
duced at the plug-in interface within the mainframe; howev-
er, the switching logic is selected in the plug-in units. The
system allows any combination of plug-ins and Display
switch settings. Refer to the individual plug-in manuals for
specific capabilities and operating procedures.
NOTE
At sweep rates faster than approximately 1 ps, the
5B10, 5812, and 5B13 Time Base plug-in trigger cir-
cuit will not respond fast enough to allow the leading
edge of the display to be observed.
Differences in wiring between the 51 00-series and
5400-series oscilloscope plug-in interfaces will not al-
low the use of the composite trigger mode of the
5B 10,5B 12, and 5 8 13 Time Base plug-ins when used
in the 544 1. If the time base units are put in this mode,
they will trigger off the left vertical plug-in only.
Vertical Plug-in Compartments. When a vet ,~c;al plug-in
is in the active mode (Display button pushed in), a logic level
is applied to the switching circuit in the mainframe and a
display from this plug-in will occur. When two plug-ins are
both active in the vertical compartments, a multi-trace dis-
REV MAY 1982
2-7