YOKOGAWA TA220 User Manual page 54

4.6 Setting the Arming
Explanation
4-10
Arming refers to the cue used to start the measurement. As opposed to a trigger, which
refers to the cue used to measure the pulse width or phase difference of each pulse,
arming refers to the starting point of the measurement of a set of pulse widths or phase
differences used to derive the jitter.
Auto Arming (Internal Arming)
If you turn OFF both the
signal of the TA220 is the arming source. Arming is the cue used to start the first
measurement (the first trigger).
External Arming
Arming is activated when an external signal (arming source) is applied to the external
arming input terminal.
• Slope
• : Arming is activated on the rising slope of the external arming signal.
• : Arming is activated on the falling slope of the external arming signal.
• Arming Delay
When using external arming, set the delay time of arming in the range shown below.
Setting range: 0.0 to 100.0 ms (in steps of 0.1 ms)
• External Arming Signal
Input the external arming signal to the terminal labeled "EXT ARM IN" on the rear
panel.
Item
Connector type
Input Impedance
Input coupling
Input level
Allowable input voltage range
Minimum input pulse width
* The typical value is a representative or standard value. It is not strictly guaranteed.
EXT ARM
IN
(External arming
signal input
terminal)
(TTL)
Do not apply a voltage that exceeds the allowable input voltage range to the
external arming signal input terminal. This may cause damage to the TA220.
and indicators, auto arming is activated. The internal
Description
BNC
10 kΩ (typical value*)
DC
TTL level
–5 to 10 V (DC+ACpeak)
30 ns
External arming input circuit
+5 V
470 Ω
74LS14 or
equivalent
10 kΩ
CAUTION
IM 704610-01E