EZ Digital OS-3060D Specifikace stáhnout pdf (Strana 47)

® Triggered B sweep

In basic delayed sweep, the

tirncaxis

is not triggered by a

signal

event, it begins when the main (A umebase) sweep cross

comparate

level scuing by DELAY

TIME

POS. knob. The only

problem with this is that mai n

tirneaxis jitter becomes apparent

in the

B sweep at higb ratios

A to B

TIME

/DN

switch setting

(100 : I

and

up).

To prev

ent

this, the B sweep can be triggered by the signal

itself, or a time-relate trigger signal. Th e DELAY T

IME

POS

control

then

determines the mini

mum

delay time between A

and

sweeps : the actual delay time will be that plus the additional

time until the next available trigger.

e result is that

actual delay time is variable only with step resolution, in

increments of the interval betwen triggers.

The maximum

mag

nification possible by this tec

hnique

is several

thou

sand

times. (CRT brightness be

ing

the limiting factor.

For

triggered B sweep, proceed as follows :

A. Set up the scope for basic delayed sweep as described in

the preceding paragr

aph

B. Press in the

TRIG

pushbutt

[21], and adjust the

Trigger LEVEL control

if necessary. Th e B timeaxis is

now triggering on the same trigger signal as the A

timebase. The stan of

B sweep will always be a leading or

trailing edge of the trigger signal : turning the DELAY

TIME

POS

control will not change this.

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