BNC 1105 Universal Counter - Manual (Page 40)

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Digits Arming
Under the Digits Arming mode with the range from 3 to 15 as shown
in the Figure 4-10 for the available measurement including
frequency, period, and ratio, users can set the resolution they
request.
Figure 4-10
Gate and External Arm operations
1. Press Stop/Single button to stop the Counter from taking continuous
measuring.
2. Select your desired measurement function by pressing one of the
measurement function keys and the corresponding softkey if it’s
needed (refer to Chapter 3).
3. Connect an external signal source to the Ext Arm connector on the
rear panel if users want to apply the External Arming.
4. Press Gate&ExtArm button to further select from the menu.
For frequency, period and ratio measurements:
Press the softkey under GATE to toggle from auto, time, digits and
external.
■ If Auto Arming is selected, the Counter will automatically start
continuous measurement.
■ If Digits Arming is selected, use the numeric keypad or the arrow
keys to input a desired number of digits or resolution (refer to
Ch.4.2.1).
■ If Time Arming is selected, use the numeric keypad or the arrow keys
to select a desired gate time (refer to Ch.4.2.1). The unit will show
on the top-right corner.
■ If External Arming is selected, press the softkey under START to
specify whether measurement should start at the positive or
negative edge. Press the same key to toggle between positive and
negative. Press the softkey under STOP to toggle between positive,