HP 437B - Page 27

HP 437B
@ Table 8-2. Schematic Diagram Notes (4 of 8)
DIGITAL SYMBOLOGY REFERENCE INFORMATION
Input and Output Indicators
Implied
Indicator—Absence
of
polarity
indicator
(see
below)
implies
that
the
active
state
is
a
relative
high
voltage
level.
Absence
of
negation
indicator
(see
below)
implies
that
the
active
state
is
a
relative
high
voltage
level
at
the
input
or
output.
- Polarity Indicator—The active state is a relatively low voltage level.
Dynamic Indicator—The active state is a transition from a relative low to a
relative high voltage level.
Inhibit Input—Input that, when active, inhibits (blocks) the active state outputs of
a digital device.
Analog Input—Input that is a continuous signal function (e.g., a sine wave).
Polarity Indicator used with Inhibit Indicator—Indicates that the relatively low
level signal inhibits (blocks) the active state outputs of a digital device.
Output Delay—Binary output changes state only after the referenced input (m)
returns
to
its
inactive
state
(m
should
be
replaced
by
appropriate
dependency
or
function symbols).
Open Collector Output—Output that must form part of a distributed connection.
SERVICE 8-9