3156B User Manual
WaveCAD 4-32
Racal Instrument © 2005
If you look at the example in Figure 4-14, with pattern rate set to
1Mpps (mega patterns per second), step one will generate the
following pattern at the digital output connector:
000000000010 Stable for 5
μ
s (5 pattern rate clocks periods)
000000000100 Stable for 20
μ
s (20 pattern rate clocks periods)
000000001000 Stable for 1ms (1000 pattern rate clocks periods)
000000010000 Stable for 2
μ
s (2 pattern rate clocks periods)
000000100000 Stable for 17
μ
s (17 pattern rate clocks periods)
Each channel can be designed to have its own digital patterns so
program channel 1 table with the Channel 1 button depressed. When
ready to program the 2nd channel, point and click on the Channel 2
button.
The Append, insert and Delete buttons operate on individual line
entries. The Clear All clears the data table so you can start from a
fresh list.
The Import… and Export… buttons let you save or retrieve files. The
list is stored exactly in the same format as would be used by external
utilities. The Save button stores the table in a temporary location for
future uses by WaveCAD. The Download button updates the 3156B
with the frequency hop table data.
Point and click on Cancel to discard of any changes you made to the
table and to remove the Data table from the screen.
Hint
The Freerun and the Stimulus pattern tables are almost
identical except the Freerun has variable hold time. If you
do not intend to use the variable hold time feature, it will
be easier to program the Stimulus pattern table and have a
single pattern rate value to program.
Video Stroke Generator
The Video Stroke Generator Group provides access to and control
over generation of either standard, built-in or arbitrary, user-definable
video stroke characters. The video function mode is selectable from
the Main Panel. When this mode is selected, both channels must
share the same mode because channel 1 is used for driving one video
axis while the other channel drives the second axis.
There are two video stroke modes:
1) Standard stroke Characters – Using this mode, one can use one of
10 built-in stroke character: Cross locator, Crosshair, Positioned
square, Vertical marker line, Horizontal marker line, Right hand
arrow, Left hand arrow, Diamond overlay, Upright triangle and
Inverted triangle. To select one of the built-in characters, point and
click on one of the buttons which are numbered from 1 to 10.
