External Width Mode - HP 81101A Quick Start Manual

For the second example, either the internal PLL or an external CLK-IN
are used to source the period—both cannot be triggered synchronously.
Gated by:
ARMING SOURCE
(Gated by:) EXT INPUT
or MAN Key
PERIOD SOURCE
internal PLL. or CLK-IN
OUTPUT
Single Pulses
OUTPUT
Double Pulses
TRIGGER OUT
STROBE OUT
1st period

External Width Mode

In external width mode, the pulse width is determined by an external
signal. You can choose between:
• MANK : Pressing the key generates a leading edge, releasing the key
EY
generates a trailing edge.
• EXT-IN: A rising edge at the EXT INPUT generates a leading edge, a
falling edge generates a trailing edge.
The threshold and impedance of the EXT INPUT can be set on the
Trigger Level screen.
The period, delay, and width of the output pulse are not programmable in
this mode, because they are determined by the external signal.
The TRIGGER OUT rises and falls parallel to the OUTPUT signal.
PLL/CLK-IN NOT Synchronous to EXT INPUT
DELAY = n * Period, 1 < n ≤ 2
Burst of 3
Period
last period
Using the HP 81101A
The Mode/Trigger Screen
last period
1st period
55