Chapter 2 Operating Your Frequency Counter
Using the Gate & External Arm Menu Key
Operating Guide 2-15
2
Using the Gate & External Arm Menu Key
Overview of Gate/External Arming Functions
Table 2-2 lists the menus for all the arming configurations, and shows how the Gate
and External Arming menu changes as a function of the arming mode.
The Counter has four arming modes: auto, external, digits and time. The arming
modes are defined in the following paragraphs.
TIME Arming
For frequency, period, and frequency ratio, time arming means you can set the gate
time—the length of time for which your signal is measured.
NOTE Gate time and resolution are linked: the longer the gate time, the greater the
resolution. With an increase in resolution, you get a larger number of digits on the
display.
Time arming is demonstrated in the sub-section titled “Example Procedure for Gate
and External Arm.”
AUTO Arming
For frequency, period, and frequency ratio, auto arming means make individual
measurements as fast as possible.
EXTERNAL Arming
For frequency, period, and frequency ratio, external arming means you can start a
measurement by using an external signal.
NOTE When external arming mode is enabled, a signal must be connected to the Counter’s
rear-panel Ext Arm connector.
Other
Meas
Freq
Ch 2
Gate &
ExtArm
MEASURE
Freq
Ch 1
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