HP 54645A, User'S And Service Manual

Page: 38 / 301

Front-Panel Areas Description Applies to Unit:
Status Indicators Status indicators include the following:
Channels that are turned off are visible only if you select a
channel that is off by using the Select knob. HP 54645D
Average mode is indicated by “Av”. Peak detect mode is
indicated by “Pk”. These indicators are active when displayed in
inverse video on the line above the display. When Time/Div is set
to 5 ns, and Peak Detect display mode is selected,
Pk is
displayed at the top of the display, but has no effect, and is not
highlighted.
HP 54645A/D
Delay includes the time reference indicator, the offset markers,
and the delay measurement. The solid triangle marker (
▼ ) points
to the trigger event in both the main and delayed sweep; it
moves with the Delay knob. The
∇
symbol indicates the time
reference point. The time reference indicator is a left arrow (
←
)
if the trigger event is at the beginning of acquisition memory, a
right arrow (
→
) if the event is at the end of acquisition memory,
and a down arrow (
↓
) if it is at the center. The offset markers
and delay measurement work together when you adjust the
Delay knob and Horizontal Mode is set to Main, to indicate how
far you have delayed the trigger event from the initial time
reference position.
HP 54645A/D
Time/Div shows the time base setting. Time per division is
variable from 2 ns/div to 50 s/div for HP 54645A, and from 5 ns/div
to 50 s/div for HP 54645D. HP 54645A/D
When Coupling is set to AC, a small sine wave is included in the
top left area of the status line. HP 54645A/D
Front-Panel Overview
Description of Front-Panel Areas
2-13