BRUEL & KJAER 4915 - Page 26

BRUEL & KJAER 4915

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20

.......

·-

Fig. 3.6.

Portable

Stroboscope

Type

4912

Flash

Trigger-----...

Ref.

Output

+15

V,

2

ms

pulse

Chassis

Ground

~ -

---Flash

Ignition

Output

+15 V, 2

ms

pulse

811438

Fig.

3.

7.

SIGNAL

OUTPUT

socket

connections

for

external

triggering

of

the

Portable

Stroboscope

Type

4912

Note: When an

external

trigger

source

with

frequency

greater

than 110 Hz is

employed

with

the

4913, the flash rate as well as

repetition

frequency

of

the

"Flash

Trigger

Ref."

and

"Flash

Ignition"

outputs

of

the

instrument,

will be a

sub-multiple

of

the

external

trigger

frequency

(see

section

3.3).

Also

the

actual

phase

delay

of

the

"Flash

Ignition"

output

with

respect

to

the

"Flash

Trigger

Ref."

output

may

include

one

or

more

periods

of

the

external

trigger

signal.

However,

with

regard

to

strobosopic

observation

of

moving

objects,

the

apparent

phase

delay

will

be

the

same

as

that

set

on

the

4913.

For

further

information

on the

Portable

Stoboscope

Type

4912,

its

Instruction

Manual

should

be

consulted.

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