Heathkit IM-4100 - Page 48

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OPERATION

Refer

to

Figure

6

in

the

Illustration

Booklet

for

a

description

of

the

display,

control,

and

adjustment.

CAUTION:

Use

ONLY

the

center

conductor

of

the

input

lead

of

your

Counter

to

check

the

frequency

of

an

AC

line

voltage.

Connecting

the

ground

input

lead

to

the

“hot’’

(ungrounded)

side

of

an

AC

line

may

result

in

a

blown

fuse

and/or

damage

to

your

Counter.

INPUT

PROBES

AND

CABLES

Any

standard

10

megohm

oscilloscope

probe

can

be

used

with

this

Counter.

Refer

to

the

Maximum

Input

Voltage

for

the

maximum

AC

voltage

that

can

be

applied

to

the

INPUT

of

the

Counter

at

various

frequencies.

When

you

connect

your

Counter

to

a

transmission

line,

make

sure

that

the

line

is

properly

terminated

(low

standing

wave

ratio)

to

avoid

possible

damage

to

the

equipment

under

test

and

incorrect

readings.

READING

THE

COUNTER

CAUTION:

Avoid

any

excessive

voltages

that

could

damage

your

Counter.

Refer

to

the

“Maximum

Input

Voltage”

for

maximum

safe

input

voltages

at

various

frequencies.

Maximum

Input

Voltage

Up

to

a

frequency

of

100

kHz,

the

maximum

permissible

input

voltage

is

250

volts

rms.

At

frequencies

above

100

kHz,

the

maximum

input

voltage

must

be

derated

according

to

the

following

graph.

1Hz

10Hz

10kHz

100kHz

1O0MHz

30MHz

MAXIMUM

INPUT

VOLTAGE

DERATING

CURVE

1MHz