Tabor Electronics 5064, Руководство пользователя

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2074
User Manual
3-60
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Figure 3-37, Selecting a Counter/Timer Measurement Function
Counter/Timer
Menus
There are various counter/timer settings that define how the
instrument will perform the measurement. For example, the period
of the gate time must always be larger than the period of the
measured signal. The counter/timer menus are described below.
Display Time
There are two display times available with the 2074: Normal and
Hold.
Normal
– defines continuous measurement taken at an interval
equal to about gate time period plus 300 ms. This mode of
operation assures that reading are taken and displayed long
enough for the eye to see the result.
Hold
– defines single reading taken and held on the display until
cleared and armed for the next measurement. This mode is
especially useful for systems applications where reading must be
prepared only once and taken at a specific time.
Gate Time
The gate time defines how long the gate will open and allow signal
to enter the measurement bin. The gate time value is important
because it must be larger than the period of the signal. It also,
indirectly, controls the number of digits that can be displayed. At a
gate time of 1 second, the counter can display eight digits. As the
gate time is reduced, the number of displayable digits is reduced
proportionally. Also note that the gate opens only after a valid signal
is available at the counter input (TRIG IN connector) and therefore,
make sure you arm the counter for measurement only when you
expect the signal to appear at the input otherwise, you may lock out
the remote interface until a signal triggers the input and the
measurement has been completed.