BRUEL & KJAER 4912 Instruction Manual page 14

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70
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>
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85
.r::.
0,
::i:
90
95
100
105
110
115
120
125
Fig.3 .2.
10
125
130
8000
135
45
140
145
yo
9000 -
- -
160
- -
_ 50
-
10000
170
-
-
-
-
180
11 000
190
g
55
~
200
12 000
C
c
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60
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Cl>
Cl) 17 000
300
18 000
70
19 000
20000
75
400
80
500
85
90
600
700
95
800
100
1,0k
105
110
2,0k
115
120
125
800459
Nomogram for determining motion frequencies higher than 125Hz with free -running strobo-
scope operation
where:
f
m
= true motion frequency;
f h-1
=
second-highest flash frequency;
fh
=
highest flash frequency.
When FUNCTION SELECTOR is set to "Power Off", the indication on the FREQUENCY
DISPLAY may linger for a few seconds. This is a normal condition.