7Tutorial
334 Keysight 34970A/34972A User’s Guide
– You can control when the totalizer actually records counts by providing a gate
signal (G and terminals on the module). A TTL high signal applied to the
“G” terminal enables counting and a low signal disables counting. A TTL low
signal applied to the “ ” terminal enables counting and a high signal disables
counting. The totalizer only counts when both terminals are enabled. You can
use either the G terminal, the terminal, or both. When a gate is not
connected, the gate terminal floats to the enabled state, effectively creating a
“gate always” condition.
Totalizer Errors
– Noise on the totalizer input can be a problem, especially on signals with a slow
rise time. This noise can create a false indication of a threshold crossing. For
more information on cabling noise, see page 268.
– Contact bounce on external switches can create false counts. All mechanical
switches bounce when they open and close. Use an external capacitor to filter
the contact bounce.
Input Signal
(Rising Edge)
Gate Signal
(High True)
Totalizer Input
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