Boonton Electronics 71A, 71AR - Page 14

Boonton Electronics 71A, 71AR

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(c)

With

the

instrument

on

the

1

pF

range~

and

no

specimen

connected

to

the

"TEST"

terminals,

set

the

indicator

to

about

75%

of

full

scale

using

the

front

panel

"c

ZERO"

control.

(d)

Adjust

the

front

panel

"COMP

ADJ"

control

for

a

peak

reading.

(Readjust

the

"c

ZERO"

control

to

keep

indications

on-scale

if

necessary)

.

(e)

Having

achieved

a

peak

reading~

return

the

indicator

to

zero

using

the

"c

ZERO"

control.

(f)

Switch

to

the

1000

pF

range~

and

observe

the

zero

position

of

the

indicator.

If

required~

set

to

zero

using

the

"1000

pF

ZERO"

at

the

rear

panel.

(g)

Switch

one

range

at

a

time

back

to

the

1

pF

range,

observing

the

zero

position

of

the

indicator

for

each

range.

If

the

zero

posi-

tion

shifts

appreciably

for

any

range,

re-

peat

steps

(c)

through

(g).

When

properly

adjusted,

the

zero

position

should

be

con-

stant

for

all

ranges.

NOTE

Once

properly

set,

the

"1000

pF

ZERO"

rarely

needs

readjustment.

However~

since

its

set-

ting

is

essential

to

the

proper

operation

of

the

instrument

for

either

capacitance

or

inductance

measurement,

it

is

advisable

to

check

it~

following

steps

(f)

and

(g)

above,

at

fairly

frequent

intervals.

(h)

Stretch

a

short

length

of

#22

copper

wire

between

the

"INDUCTANCE"

terminals.

(j)

Switch

the

"L/C"

switch

to

the

"L"

posi-

tion.

The

indicator

should

rest

one

minor

division

up-scale

from

zero.

If

not~

ad-

just

for

this

reading

using

the

"L

ZERO"

control

(the

center

adjustment

on

the

left

side

of

the

instrument).

3-2

71A

d