Standard Features - Wavetek 75 Instruction Manual

GENERAL DESCRIPTION
1.1 MODEL 75
The Model 75 is a versatile, yet easy to use arbitrary
waveform generator. It contains advanced waveform
editing features that allow the user to easily create and
edit complex waveforms.
1.2 WAVEFORM EDITING
The editing featuresare based on a pair of points called
"thumbtacks". These thumbtacks are placed at each
end of the portion of the waveform to be edited, then the
appropriate editing feature is invoked. The thumbtacks
will appear as bright dots on an oscilloscope using Z-axis
modulation.
1.2.1 Standard Waveforms
Standard waveforms are inserted between the thumb-
tacks. Astandard waveform can be the entire waveform
or only part of it. The standard waveforms are sine,
cosine, inverse sine, haversine (inverse cosine), triangle,
square, ramp up, ramp down, and dc. These standard
waveforms can then be edited using the other editing
features if desired.
1.2.2 Rubber Band Editing
Rubber band editing is analogous tostretching a rubber
band between two thumbtacks. A cursor is placed
between the thumbtacks which can be moved in either
theXor they direction.The waveform is then stretched
from each thumbtack to the cursor in real time.
1.2.3 Digital Amplitude and Digital Offset
The sectionof the waveform that is between the thumb-
tacks can beadjusted in amplitude and offset in real time
without affecting the rest of the waveform.
1.2.4 Point Edit
Individual points of the waveform can also be adjusted
in real time.
1.3 STANDARD FEATURES
1.3.1 81 92
x
4095 Point Waveform Resolution
The waveforms have a vertical resolution of 4095 points
and a horizontal resolution adjustable from 2 to 8192
points. The waveform memory is broken up into four
blocks of 2048 horizontal points. This can be used as one
waveform of up to 8192 points or as four different
waveforms (one active and three stored) of up to 2048
points each.
1.3.2 Crystal Controlled Frequency
The waveform clock (sample frequency) is crystal con-
trolled and adjustable from 20 mHz to 2 MHz (500 ns to
50s), allowing a waveform periodof 1 ps to 11 3.8 hours.
The frequency is adjustable as either waveform fre-
quency, waveform period, or sample frequency. An
external TTL level clock of up to 2 MHz can also be used
as the waveform clock (sample freq).
1.3.3 Operating Modes
The Model 75 can operate in continuous, triggered,
gated, toggled, or burst modes. All modes except con-
tinuous are initiated (triggered) by either a front panel
pushbutton or an external signal. In these modes the
waveform stops at break points which can be inserted
anywhere in the waveform (by default one breakpoint will
be at the start address), then waits for another trigger.
In burst mode, a predetermined number of waveforms
(from
1
to 1,048,575) is generated before stopping.
1.3.4 Internal Waveform Counter
In gated, toggled, and burst modes an internal counter
can be used to display the number of complete
waveforms since the last trigger. This is particularly
useful for monitoring a burst of waveforms or counting
the number of waveforms for fatigue testing.
1.3.5 Hold Function
A front panel pushbutton or external signal will cause
the waveform to stop at the current output level and
remain there until the hold is released.
Scans by ArtekMedia O 2006