Chained Operation; Waveform Counter; Return To Start; Burst Mode - Wavetek 75 Instruction Manual

3.15.5 Burst Mode
In the Burst mode, a trigger signal causes the generator
to output a predetermined number of waveforms (as set
by the burst count) and stop at the next break point. To
set the burst count, press the BURSTsoft key(from the
Parameter menu) and use the Control knob to set a count
from 1 to 1,048,575. Inputting another trigger signal dur-
ing the burst sequence will cause the burst counter to
start over.
3.1 6 SETTING AND CLEARING BREAK POINTS
To insert a "break point" into the waveform, press the
CSR soft key (from the Setup menu) and then use the
Control knob to position the cursor to the desired loca-
tion in the waveform. The cursor position will be indicated
numerically on the display and as a bright dot on a
oscilloscope if the Z-axis modulation is used. Next, pcess
the TGLBP soft key (from the Setup menu) to toggle the
break point on. To remove a break point, move the cur-
sor to the location of the break point either with the CSR
soft key and the Control knob or by using the NEXTBP
soft key. The NEXTBP soft key rnoves the cursor to the
next break point. If there is a break point at the present
cursor position, thedisplay will indicate it with the word
"ON" after the cursor address. All of the break points
can be cleared and the default break point (X
=
0000)
inserted by pressing theCLRBPSsoft key(from thesetup
menu) followed by the EXEC soft key. For the operational
modes to work correctly there must be at least one break
point somewhere in the waveform. TGLBP both sets and
clears breakpoints.
3.1 7 SYNC ADDRESS AND PHASE
Pressing the SYNC soft key (from the Set Up menu)
allows the position of the pulse at the "Sync Out" out-
put to be moved, anywhere relative to the waveform, by
turning the Control knob. The display indicates the
address and phase of the pulse. The PHASE soft key also
allows the adjustment of the sync pulse, but the display
indicates a phase that is offset by two sample times. This
is used to adjust the relative phase of multiple instru-
ments as discussed below under parallel operation.
3.18 STORING AND RECALLING WAVEFORMS
The Model 75 can hold three waveforms in storage in
addition to the active..waveform. Each of these
waveforms can be up to 2048 samples long. To store a
waveform, press the STORE soft key (from the Store
menu), use the Control knob to choose the storage loca-
tion, and then press the EXEC soft key to store. Recall-
ing a waveform is done in the same way by using the
RCALLsoft key(from the Store menu). Storing or recall-
ing a waveform erases either the stored waveform or the
active waveform respectively. The EXCHG soft key (from
the Store menu) can be used to exchange two waveforms
without losing either one. Use the EXCHG soft key in the
same manner as the STORE and RCALL soft keys.
3.1 9 CHAINED OPERATION
The "active" waveform can be chained with the three
stored waveforms to create waveforms of up to 81 92
samples long. When set for chained operation the entire
waveform memory is active and no waveform storage
locations are available. Also, the digital amplitude editing
feature is not available. To set the instrument for chained
operation, press the CHAIN soft key (from the Store
menu), rotate the Control knob until "CHAIN 8K" is
shown on the top line of the display, and then press the
EXEC soft key. To set the instrument back to normal
operation, perform the previous operation except rotate
the Control knob to "CHAIN 2K". Chained operation can
also be used to view the "active" waveform and the three
stored waveforms in succession on an oscilloscope.
3.20 WAVEFORM COLINTER
Pressing the Counter key will cause the display to indi-
cate a count of the number of waveforms that have been
completed since the last trigger (up to a maximum of
1,048,575 waveforms). In Continuous and Triggered
modes the counter is disabled. The counter can be read
while the waveform is running or while the waveform is
stopped such as after a gated or toggled sequence. In
this way the length (in waveforms)of the last toggled or
gated sequence can be displayed.
3.21 WAVEFORM HOLD
The output waveform can be held at its current level by
using either the rear panel "Hold In" BNC or the front
panel Hold key. Each time the Hold key is pressed the
hold function is toggled on or off as indicated on the
display. A l T L low level or a contact closure on the "Hold
In" BNC holds the waveform and a high or open lets it
run if the front panel Hold key is off.
3.22 RETURN TO START
Pressing the Return key on the front panel or a high to
low transition (or switch closure) on the rear panel
"Return In'' BNC will cause the output to ramp from the
current output level to the level at the start address.-The
rate of this ramp is adjustable from 0 to 100 ms per
vertical step. 0 is a special case and causes the output
to jump back to the start address level. To set the ramp
rate, press the RAMP soft key (from the Setup menu) and
use the knob to adjust it. In Continuous mode the hold
will automatically be turned on at the end of the ramp
and will need to be turned off with the Hold key to restart
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Scans by ArtekMe dia 0 2006