BNC 1105 Universal Counter - Manual (Page 39)

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measurements. For totalize measurements, the counter starts to
count whenever Run button or Stop/Single button is pressed.
Figure 4-7
Time Arming
Under the time arming mode as shown in the Figure 4-8 for the
available measurement including frequency, period, ratio and
totalize, users can set the length of time (gate time) for which the
counter takes measurement.
Figure 4-8
※ Note1: The Gate Time Range on the frequency and the period is from
1E-3 to 1000 seconds.
※ Note2: The Gate Time Range on the Ratio is from 1E-3 to 200
seconds.
External Arming
Under the External Arming mode as shown in the Figure 4-9 for the
available measurement including period, frequency ratio and
totalize, a signal source must be connected to the Ext Arm connector
on the rear panel. Start and end of measurement is then controlled
by the external signal.
When the External Arming is toggled, two more items are available
to set. One is Start (Neg/Pos), and the other one is Stop
(Neg/Pos/Time/Auto)
Figure 4-9