Output
a
Sequence
of
Signals
3-15
Note
In
this demonstration, we assume active high logic by setting
the
On
Level to correspond to the desired logic level
for
the
1
bits
(+4V)
and the
Off
Level to correspond to the desired logic level
for
the
0
bits
(+O.SV).
You can also configure a Digital Sequence
for
active
low
level
logic by entering the desired
low
level as
the
On
Level and the
desired high
level
as the
Off
Level. Simply keep in mind that the
On
Level setting always determines the output level
for
the
1
bits in your sequence string and
the
Off
Level always
determines
the
level
for
the
0
bits.
Enter the On Level and the
Off
Level
4. Press the
12
15
t-1
L
e
'1.l
softkey and enter 4V.
5.
Press the
14
0
f f
L
e
'8.:
softkey and enter 0.5V.
Note on the
oscilloscope display that the
HP
8904As
output signal level is
now set
to
the
Off
Level that
you
entered
(0.5V).
Enter the Period
6.
Press the
f3
Pet-
i
od
softkey and enter
1
ms.
The period
of
each
1
Bit and each
0
Bit in
your
sequence will now be
1
ms.
1
ms
1
ms
A
+4v
/
ON
+0.5V
LEVEL
(1
BIT)
OFF
LEVEL
(0
BIT)
A
V
\
Figure
3-8.
1
and
0
Bit Characteristics.
Select the Base You Desire
7.
Press the
11
5eq
Eaze
softkey twice
so
that
E
1
t-1
appears
in the display.
The
HP
8904A
allows you to select between a
Hexadecimal, Binary or Octal base numbering system
for
formatting your Digital Sequence.
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