Bradley 233 - DC Voltage Test

40 pages

Save Page as PDF

To Next Page

To Next Page

To Previous Page

To Previous Page

Loading...

DC

level

:

to

be

between

12.

5

and

14.

5V.

Ripple

:

to

be

less

than

15mV

p-p.

4.

'-6V

Supply'

Measure

the

voltage

on

the

eyelet

near

R129

with

respect

to

the

nearest

end

of

R18

(earth).

DC

level

:

to

be

between

5.

7

and

6.7V.

Ripple

:

to

be

less

than

2.

5mV

p-p.

5.

'-18V

Supply'

Measure

the

voltage

on

the

eyelet

to

near

RH

corner;

(a)

w.r.t.

-12V

(adjacent

eyelet)

set

to

6V

using

RV443

(b)

w.r.t.

chassis :

ripple

20mV

p-p.

6.

Reset

Variac

to

240V.

5.5

DC

VOLTAGE

TEST

(Test

Equipment

3,

9,

10)

5.5.1

Output

Amplitudes

Select

level

:

max

-ve

+ve

slope

Ext

Trigger

Outputs:

Square-wave,

normal,

-ve.

Offset

zero,

Z

:

50p.

o

Measure

the

maximum

amplitude

of

each

output.

Using

RV443

adjust

the

value

of

the

smaller

output

to

be

between

-10.18

and

-10.

22V.

Record

the

maximum

and

minimum

voltages

of

each

range

on

both

outputs.

Check

that;

Minimum

amplitudes

are

between

0.1

and

0.

5V.

There

is

overlap

between

adjacent

ranges.

Maximum

amplitude

is

less

than

10.7V.

5.

5.

2

Output

Functions

Connect

output

1

to

DVM

(3).

Set

amp

to

maximum,

select

Comp,

(complementary)

checking

that

output

goes

to

zero

(±10mV).

Select

+ve

pulse.

Adjust

RV276

(output

1),

RV376

(output

2)

so

that

output

is

zero

(±20mV).

Select

'Norm'

and

record

the

+ve

amplitude

checking

that

its

value

is

the

same

but

of

oppo

site

sign

to

-ve

amplitude

(±0.

IV).

-

22