External Arming; Time Arming; Digits Arming; Hp 53131A (And Hp 53132A With S/N Prefix Below 3646) Time Interval Delay Arming - HP 53131A Operating Manual

NOTE
NOTE
Chapter 2 Operating Your Universal Counter
Using the Gate & External Arm Menu Key

EXTERNAL Arming

For frequency, period, frequency ratio, and totalize, external arming
means you can control the start of a measurement by using an external
signal.
When external arming mode is enabled, a signal must be connected to the
Counter's rear-panel Ext Arm connector.

TIME Arming

For frequency, period, ratio, and totalize, time arming means you can set
the gate time—the length of time for which your signal is measured.
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."

DIGITS Arming

For frequency, period, and ratio, digits arming means you can set the
number of digits of resolution that you require your result to provide.
Digits arming is demonstrated in the sub-section titled "Example
Procedure for Changing the Number of Digits of Resolution Displayed for
More Precise Measurements."
HP 53131A (and HP 53132A With S/N Prefix Below 3646)
Time Interval DELAY Arming
The DELAY capability (specified in the Time Interval arming menu)
provides a variable delay between the start event (Channel 1) and the
enabling of the stop event (Channel 2) as shown Figure 2-1. Potential stop
events are ignored during the specified delay time.
External arming can also be used to control the start of a measurement by
using an external signal.
Operating Guide 2-17