Model
8904A
3-5.
DIGITAL PORT
Operation
General Information
The Digital Port on the back of your
HP
8904A
allows external and internal signals
to
be used for
various signaling needs.
If
your instrument
is
equipped with Option
003,
this port allows you
to
select
Hop
Ram
addresses
to
fast
hop frequency, phase, and amplitude settings.
(For
more information on hopping, refer
to
the previous information in this section on Option
003.)
Ch.C Ch.B
Polarity Polarity
ChA
Trigger Trigger
\o
1
2
3,
out
In
v
Gnd
(Seq.
Mode)
Hop
Register
Address
(High
True)
~ ~
Figure
3-6.
Digital Port Connections
Connector Functions
Zero
Crossing
Outputs
These are
TTL
signals
that
identify when the associated channel's waveform
is
crossing the
0
volt
point in
its
waveform
(0'
and
180').
This output pulses high for approximately
600
ns each time the
zero crossing occurs.
These outputs are available with
all
instrument configurations; regardless
of
what options are present
in
your
instrument.
NOTE
Changing the Phase setting
of
the signal to be output alters the phase
relationship between the signal and its corresponding zero crossing signal.
Zero crossings are only exactly aligned with the signal being output when
the Phase
is
set to
0'.
These outputs are only valid in the Channel Configuration mode.
3-15
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