Boonton Electronics 71A, 71AR - Page 28

Boonton Electronics 71A, 71AR

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(1)

With

the

shunting

resistor

removed~

set

the

rear

panel

IICAL

1"

adjustment

so

that

the

meter

reads

the

value

of

the

standard.

(2)

Replace

the

shunting

resistor

and

adjust

"CAL

2"

so

that

the

meter

reads

the

value

of

the

stand-

ard

plus

the

capacitance

of

the

resistor.

(3)

Remove

the

shunting

resistor.

If

the

meter

indicates

the

standard

value~

the

instrument

is

calibrated.

Otherwise~

repeat

steps

a~

b~

and

c

until

both

tests

yield

the

appropriate

value.

3.10.4

Calibration

Check

of

the

Model

71AR

with

the

Internal

Standard

Capacitor

(a)

Set

the

instrument

to

the

1

pF

range

and

adjust

the

"CaMP

ADJ"

control

as

explained

in

paragraph

3.3.2.2

with

no

specimen

at

the

"TEST"

terminals.

(b)

On

completing

the

IICOMP

ADJ"

peaking~

switch

to

the

100

pF

range.

(c)

with

the

Model

7lAR

set

to

the

100

pF

range

and

the

OPERATE

CAL

IleAL

2

selector

set

to

"CAL

l"~

note

the

meter

reading.

2

11

(d)

Switch

to

the

IICAL

position

(which

reduces

the

Q

of

the

standard

to

3)

and

again

check

the

reading.

(e)

If

the

indicator

reads

100

pF

for

both

tests~

the

instrument

is

in

calibration.

Otherwise

perform

the

following

calibration

adjustments:

1

11

(1)

Set

selector

to

the

IlCAL

position

and

adjust

the

IICAL

1"·

control

at

the

rear

panel

so

that

the

meter

reads

lOa

pF.

(2)

Set

selector

to

"CAL

2".

Adjust

the

2

11

IICAL

control

at

the

rear

panel

of

the

instrument

so

that

the

indicator

reads

100

pF.

(3)

Switch

back

to

IICAL

If

the

instrument

111.

still

reads

100

pF~

calibration

is

complete.

If

not,

repeat

Steps

a~

b~

and

c

until

the

instrument

reads

100

pF

on

both

tests.

3-16

71A