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Operating Instructions--7934 Operator's
BISTABLE and YAR PERSIST. in the BISTABLE and
VAR PERSISTstorage modes, the readoutdisplay is turned
off during the storage erase cycle; otherwise, the Readout
System operates as previously described under Readout
Modes.
FAST BISTABLE and FAST VAR PERSIST.in the FAST
BISTABLE and FAST VAR PERSIST storage modes, the
Readout System turns off at the beginning of an erase cycle
or when the single-sweep time-base mode is reset and re-
mainsoff until the end of the storage transfer cycle. In addi-
tion, the Readout System is held off whenever the MULTI
TRACE DELAY controlis in operation (outofits detent pasi-
tion) and the displayed time-base unit is in a repetitive
sweep mode.
Pulsed Readout Mode. With the READOUTcontrol set
to PULSED, the Readout System operates as follows:
BISTABLE.In the BISTABLE storage mode, the readout
display runs continuously; however, the Readout System
turns off when the storage erase cycie begins and remains
off until the end of thefirst displayed sweep.
VAR PERSIST. In the VAR PERSIST storage mode one
complete frame of readoutis displayed after the displayed
time-base unit completes each sweep; however, there is no
readout display during a storage erase cycle.
FAST BISTABLE.in the FAST BISTABLE storage mode
the readout display runs continuously (as in the normal
mode); however, the Readout System turnsoff at the begin-
ning of each erase cycle or when the single sweep time-
base mode is reset and remains off until the end of the
storage transfer cycle. In addition, the Readout System is
held off whenever the MULTI TRACE DELAY controlis in
operation (out of its detent position) and the displayed time-
base unit is in a repetitive sweep mode.
FAST VAR PERSIST. In the FAST VAR PERSISTstor-
age mode, one complete frame of readoutis displayed after
the completion of the storage transfer cycle. However, there
is no readout during the storage erase cycle and there is no
readout when the MULT] TRACE DELAY control is out of
the detent position and the displayed time-baseunit is in a
repetitive sweep mode.
Readout With Save Storage Mode. When the SAVE
storage mode is used, operation of the Readout System
changes from that previously deseribed. (Refer to the SAVE
mode discussion, in this manual, for information on SAVE
storage mode operation.)
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Save With Normal Readout, With the READOUTcontrol
set in the variable area and any of the storage modes se-
lected, the Readout System turns off approximately one
second after the storage system enters the SAVE mode.
Save With Pulsed Readout. With the READOUTcontrol
set to PULSED and the storage mode switch set to
BISTABLE or FAST BISTABLE,the readoutis displayed for
approximately one second after the storage system enters
the SAVE mode; thenit turns off. With the READOUT con-
trol set to PULSED and the storage mode switch set to
VAR PERSIST, one complete frame of readoutis displayed
at the end of the displayed sweep. With the READOUTcon-
trol set to PULSED and the storage mode switch set to
FAST VAR PERSIST, one frame of readout is displayed at
the end of the storage transfer cycle, or whenever the stor-
age system is set to the SAVE mode and the MULTI
TRACE DELAYcontrolis out of its detent position.
Reduced Scan Mode
The reduced scan mode increases the stored writing
speed. The calibrated graticule division is reduced to 0.45
centimeters in the reduced scan mode. Calibrated measure-
ments are confined to the inner half-size 8 x 10 graticule
area, The operation of the instrument controls do not
change from their operation in the full scan mode.
Storage Display
The 7934 Storage Oscilloscope has four selectable stor-
age modes. Listed in orderof increasing writing speed, they
are: BISTABLE, VAR PERSIST, FAST BISTABLE, and
FAST VAR PERSIST. In each mode the viewed image is
stored on the storage target locatedin the front of the cri.
Bistable Storage. In the BISTABLE mode the luminance
of any point on the storage target takes on one of twodis-
crete levels, either written or unwritten. in this mode, only
the A or B INTENSITY controls affect the stored writing
speed; writing speed is quite low but the stored view timeis
indefinitely iong.
Variable Persistence Storage. in the VAR PERSIST
mode, points on the storage target can vary in luminance
between totally dark and very bright. In this mode, writing
speed is greater than in the BISTABLE mode,butthe stored
display is essentially unstable, or continuously fading away.
The rate of fading is adjusted by the PERSISTENCE con-
trol. The VAR PERSIST storage modets particularly useful
for viewing high-speed repetitive signals with low repetition
rates. The PERSISTENCE control can be adjusted in con-
junction with the STORAGE LEVEL and INTENSITY con-
trols, to produce a steady, bright trace. Writing speed is
varied in this mode by the STORAGE LEVELcontrol as well
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