Hop
the
Output
Signal
5-9
Fast
Hop
Example
Figure
5-3
shows
an example
of
an address selection circuit
for
fast
hopping an HP 8904A (that is equipped with Option
01
and
03)
at
the rate of the Channel
D
frequency setting. (An external timing
source can be used in place
of
the Channel
D
signal to increase the
hop rate.)
+5v
DIG
17AL
PORT
Figure
5-3.
Example Address Selection
Circuit for Fast Hopping the
HP
8904A.
Table
5-2.
lnstrument Settings for the Fast Hopping Example.
I
I
I
I
I
The following BASIC program can be used to set up the
HP
8904A
for this example over its HP-IB.
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