Vibration Categories Measured:
Whole-Body vibration:
in accordance
with
ISO
2631
-
1978
, and
draft
amend
-
ment
1 .
Also
Motion
sickness
in
accor-
dance
with
Draft
Addendum
to ISO
2631
DAD 2
(16
-
9-80)
Hand-Arm vibration: in accordance
with
Draft
International
Standard ISO/ DIS
5349
,
submitted
18
-
1-1979
Inputs: (to
three
charge
amplifiers)
3
miniature
coaxial sockets on
front
panel
in
parallel
with
a
6-pin
DIN socket
on rear panel
Input Sensitivity:
Calibrated
for
accelerometer
sensitivity
1
pC
/
ms-2
Input Impedance:
>
18
GO
DC
shunt
resistance
Frequency Response:
Dependent
on
category selected. See
Fig .4
Frequency
weighting
curves have re-
sponse and accuracy as
required
by
the
various
standards
mentioned
Log.
RMS
Detector:
Frequency range:
0,
1
to
1
000
Hz
Dynamic range:
60
dB
including
crest
factor
3
Time constants: 2 s
for
whole
-body and
hand-arm
( 1
25
ms
in " Preset")
10
s
for
mot
i
on
sickness
Equivalent Exposure Dose Calculator:
Calculates
equivalent
exposure based
on
Log. RMS level every
two
seconds
Range: 0
to
9999%
in
1 % steps
Accuracy (expressed as a percentage
of
the
dose readout): Hand-arm ± 5% ex-
cept at step level changes (see Fig . 7)
Whole body
0,
1-0,63
Hz (motion sick-
ness) ± 1 5% .
Whole Body 1 -
80
Hz
+ ( 4 min. x Exp . dose readout %)
o/c
- Elapsed
time
(min)
0
where
equivalent
100
% dose
time
is
10
min
. to
27
min.
or ±
15
%
where
equivalent
1
00
% dose
time
exceeds
27min
.
Leq
Calculator:
Calculates
equivalent
continuous
vibra-
tion
level according to
the
equal
energy
principle
Updates display every
eight
seconds
Capacity: at least
1000
s (
16,6
min
.)
measuring
time,
maximum
53
minutes
Range:
104
to
139,5
dB
(-
0,
16
to
9.4
ms-2)
for
whole-body
and
motion
sickness
124
to
159,5
dB
(-
1,6
to
94
ms-2)
for
hand
-
arm
Accuracy:
better
than±
0,5
dB
Crest Factor Capability:
better
than
3
(worst
case
at
max. level)
Log. Peak Detector:
Stores
Max. peak level
during
measure
-
ment
period
Specifications
251
2
Range:
100
to
146
dB
(-
0,
1
to
20
ms-2)
for
whole-body
and
motion
sickness
1
20
to
1
66
dB
(-
1
to
200
ms-2
,)
for
hand-arm
Accuracy: ± 1 dB
Digital Display:
7
segment
LED, 4
digits
Quantities Selectable:
Equivalent exposure, 1
to
9999%
resolu-
tion,
1%
Leq
100
to
159,5
dB,
resolution
typically
0,
5dB
Peak level,
100
to
166
dB,
resolution
ty-
pically 0,5 dB
Elapsed
minutes
, 0
to
999
minutes,
reso-
lution
0,
1
minutes
Analogue Meter:
Indicates Log RMS level
in
dB re 1
o-6
ms-2
and
in
ms-2
·
20
dB
must
be added
to
meter
reading
for
hand-arm
measurements
Overload Indicators:
Equivalent Exposure:
LED
lamp
indi-
cates dose exceeding
9999%
or
exceed-
ing
of
2 s dose
maximum
(lights
for
- 2
s)
Leq:
LED
lamp
indicates
memory
full
or
53
minutes
exceeded
Peak: LED lamp indicates overload
in
AC
circuitry
Reference Oscillator:
1 6 Hz reference signal gives Leq =
120dB
(1
ms-
2
)
±0,5dB
in
whole-body
and
140dB
(lOms-
2
)
±0,5dB
in
hand-
arm
Not
applicable
to
motion
sickness meas-
urements
AC
Output:
BNC socket ("
Output
to Ext. 1-ilter" )
Signal available
either
weighted
or
un-
weighted
Level:
200
mV
/
ms_:_
2
(at
ref
.
freq
.
in
Fig.5.)
in
whole-body
and
motion
sickness
20
mV
/
ms-2
(at
ref
. freq. in Fig.5 .)
in
hand
-
arm
Output Impedance:
50
n
Min.
Load Impedance: 5 kO
DC
Offset:
300
mV
ma"-.'
DC Output:
BNC
socket
Signal
from
Log
RMS
detector
Level:
100
mV/dB.
0 V =
100
dB
in
Whole-Body
(
120
dB
in
Hand-Arm)
Min. Load Impedance: 5 kQ
Interface
Bus:
25
pin connector. Bus in accordance
wi!._h
IEC
625-1
*
Functions
Used: T3 (Addressable basic
talker
with
"talk
only"
mode); provided
with
SH
1 and AH 1
Data: Readout
of
Max
. peak and
Leq
dur-
ing
measurement
period
Equivalent Exposure
H.V. Category
and
Criterion
selected on
front
panel
Elapsed
time
Data Transmission Code: ASCII
External Filter Sockets:
Two
BNC sockets
Output
to
Ext. Filter:
As
for
AC
Output
Input from Ext. Filter: Max. signal level
6V
peak
Input impedance:
14
7 kO
in
parallel
with
100
pF
Environmental Conditions:
The
instrument
performs
within
specifica-
tions
under
the
following
conditions
:
Temperature: -
10°C
to+
55°C
Humidity: 0
to
90%
relative
humidity
non-
condensing
Magnetic: Field
strengths
up
to
100A/m
Internal Power Supply:
Six
IEC
R20
type D
cells
Operating capacity: 1 8
hours
continu-
·
ous
with
alkaline
cells ( 1 2
hours
with
op-
tional
NiCd rechargeable cells)
External Power Supply:
Rear panel
connection
through
7-pin
DIN
socket
Requires+
6 V
to+
15
V
DC
, 1,5 W
Power Supply Output:
28
V.
2
mA
miniature
socket,
for
Acceler
-
ometer
Type
8306
Dimensions: (excl .
feet
, knobs etc.)
Height:
133
mm
(5,2
in)
Width:
210
mm
(8,3
in)
Depth:
200
mm
(7,9
in)
(B
& K
module
cabinet
KK
0025
6/
12
of
19"
rack module)
Weight:
3, 1 kg
(6,8
lb)
including
battery
Accessories Included:
6
Alkaline
Cells
1 7
pin
DIN
plug
3 BNC
plugs
2 Spare fuses
Accessories Available:
QB
0004
JP
0703
JP
0035
VF
0050
Battery
Charger
ZG
O
11
3
6 Ni-Cd Cells QB
0008
Triaxial
Seat-Accelerometer
Type
4322
Triaxial
Accelerometer
Type
4321
Accelerometer
Types
4371,
4384
,
4370
and
8306
Mahogany
outer
cabinet
KA
0063
(sup-
plied as standard
if
251
2 B version
or
-
dered)
Carrying Case
KA
2000
Input
adaptor
for
tape recorded
signals
IEC
625-1
interface
cable
(2 m)
AO
0194
IEC
(male, slide lock) to
IEC
625-1
Interface cable
(2m)
AO
0184
Adaptor
to
convert
IEEE
instrument
to
IEC
625
-1
AO
0195
Scale for interpretation of dis-
tribution diagrams (from4426) SC 2363
Compatible
with
IEEE
Standard
488
-
1975
and
ANSI MC 1.1-
1975
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