Agilent Technologies 54501A Dokumentacja Pobierz pdf (Strona 62)

panern

Key

This

is an

rmlabelled field" The

displaydepicts

the

Sbit

pattern

The

active

field

is

displayed

in

fu[-bright

-6 is

changed

with

the knob.

Tbe

function key

changes the bit selection

of three lcvels:

1 ll

_

high

o L-low

o X-don'tcare

The

criteria fsl

high

is

highgl

than 1f,9

current

trigger level

and low is

lower

then

the current trigger level.

The

3-bit

pattern

represents the

two

channel inputs

and the

e$ernal

trigger. The left-most

bit corresponds

to channel?

andthe right-most

bit

corresponds to the erernal trigger

chqnnsl.

For

exanple, if

the

pattern

is LXH,

the voltage

on channel

l must

be

lower

than the trigger level set for

channel 1,

channel

2 is

don,t

care

so

1[s

input

level is

disregarded and the

external trigger

input

must

be

highsl

than the triger

level

set for

external

trigger. If

these

conditions

are satisfied by

the

inputs, then

the oscilloscope generates

a trigger

event.

Note

llhen

any channel is not being

used in

the

qualifier

panem"

it

should be set as don't care. The triger

level

is

still compared

to

the no input

channel

and

a higlt or low

is determined.

The

only

true

don't care is

X.

If

the

pattern

XXX is

selected, a trigger

event

does not

occur

because

a

trigger event is not

defined.

when Key

This key

controls

five

sets of conditions

that must

be satisfied

to

generate

2 6igger event. These conditions

are as follows:

o

when

entered: a trigger

is

generated

on

the

hrst

transition

that makes

a

pattern

true.

The pattsrn

must

be false

and

go

true

to

generate

the

trigger.

HP 54510A

Front-Panel

Reference

Trigger

Menu

&9

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