Bradley 233 - Pulse Shape

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Select;

Free

run

Parallel

delay

Delays

at

Min.

Output:

A

or

B

Connect

Output

to

width

measuring

instrument.

Ensure

that

the

period

is

always

at

least

twice

the

width.

Record

Gal

and

Max

values

on

all

ranges

of

both

widths.

At

lOnsec.

,

record

width

at

50%

on

both

Normal

and

Comp.

Check

that

the

extremes

of

lOnsec.

(±2nsec.)

and

1

sec

are

reached,

and

that

there

is

overlap

between

all

adjacent

ranges.

5.7.3

Delay

A

or

B

Select:

Free

run

2-

C-

Parallel

delay

Widths

as

convenient

but

less

than

half

the

period

Measure

the

delay

between

the

leading

edge

of

the

pre-pulse

and

the

leading

edge

of

the

output

pulse.

Ensure

that

the

period

is

always

at

least

twice

the

delay.

Record

Cal

and

Max

ranges

of

both

delays.

Check

that

the

extremes

of

SOnsec

and

1

sec

are

reached

and

that

there

is

overlap

between

all

adjacent

ranges.

Check

that

both

width

A

and

B

are

obtainable

from

the

other

output.

5.8

PULSE

SHAPE

(Test

Equipment

7,

8)

5.8.1

Max.

Frequency

Set:

Both

outputs

to

Square-wave,

Max

amp.

Check

that

8V

p-p

are

obtained

on

each

output.

Set

all

delays

and

widths

to

minimum.

Select

A

pulse

and

check

that

no

moding

is

visible.

Repeat

for

B

pulse.

5.8.2

Risetime

Set

period

to

20ps.

Check

that

rise

and

fall

times

are

6nsec

or

faster

on

each

output.

5.8.3

Overshoot

-

Perturbations

Set

oscilloscope

to

5mV/cm.

Connect

the

output

to

the

oscilloscope

using

a

xlOO

probe

with

50n

BNC

leads.

Switch

the

oscilloscope

timebase

from

5nsec

to

Ipsec/cm.

Check

that

there

is

no

overshoot

or

perturbation

of

amplitude

greater

than

±lcm.

Reduce

amplitude

to

2V

with

offset

off

and

repeat

using

x20

probe.

-

25

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