HP 437B Service Manual page 27

HP 437B
@ Table 8-2. Schematic Diagram Notes (4 of 8)
DIGITAL SYMBOLOGY REFERENCE INFORMATION
Input and Output Indicators
- 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