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Fig. 17.
Control
Signal
Selector
Type
5686
The
Control Signal Selector
Type
5686 will select the
highest,
lowest
or
mean vibration
level
from 6 input
channels for
use as
the compressor
control
signal. The
sampling time
is
equal to the time
period
of the vibra-
tion
frequency.
The
instrument is
shown
in
Fig.
17.
A
set-up
for
multi-point
testing is
shown
in Fig. 18.
Four
accelerometers
measure
t
he vibration
in the
structure
at four points
of interest.
After condi-
tioning
by Charge Amplifiers Type
2651
the control
signals
are input to
the
Type
5686
which
t
hen
supplies
the
selected
signal
to the 1050 compressor
section.
FREQUENCY GENERATION:
Frequency Range:
1 Hz to
10kHz
Frequency Resolution: 1,19 mHz
Frequency Stability:
<
25 PPM Drift
(5 to
40°C), <
5PPM Aging per year.
Frequency Display Unit: Hz, including 0 to 3
decimals.
Frequency Control:
Manual,
automatic or via
the interface
bus.
SWEEP:
Sweep
Modes:
Linear or logarithmic with
start, stop and
reverse
at any
frequency.
Sweep Count: Sweep total is selectable from
1 to 9999, or may be
continuous.
Display in-
cludes elapsed number of sweeps.
Sweep Limits: Selectable upper and lower
sweep limits having
0,1
Hz display resolution
.
The upper limit must exceed
the
lower
limit
by 0,3
Hz.
Sweep Rate: 0,001 to 100 Hz/s (lin)
0,001 to 100 oct/min (log)
3 digit
resolution.
VARIABLE OUTPUT (low frequency):
0 to
10V
RMS, amplitude controlled
manually,
by the compressor or via the
interface
bus.
Output Level: Displayed in dB relative to 10 V
RMS in operate (1 V RMS in operate
-20
dB)
with 0,1 dB resolution.
Amplitude
Linearity:
±
0,1 dB
(1 Hz
to
10kHz)
Harmonic
and
Spurious
Distortion:
<-75d8
Sampling
Frequency
Power
Supply
2805
Control
Accelerometers
eg. 4382
r:::::1.
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Vibration Exciter
Control 1 050
Power Amplifier
2708
Exciter 4802
+
Head
85181511
Fig.
18. Instrumentation for multi-point
control testing
The Vibration
Exciter
Control Type
1050 is supplied
in
a
lightweight
metal
cabinet (model A), or
in
the same cab-
inet with flanges for 19"
rack
mount-
ing (model C).
Specifications 1 050
Signal/Noise:
>
5 dB at output level of
-100dB
Max Load: 10kQ/3nF
FIXED OUTPUT (low frequency):
10 V peak
.
Two outputs with 7 V RMS ampli-
tudes and
goo
phase difference.
Phase Shift Accuracy:
±
1
o
(1
Hz
to
1
kHz),
±5°
(1Hz to 10kHz)
Signal/Noise:
>
7 4 dB
Max Load: 10 kQ/1 nF
FIXED OSCILLATOR OUTPUT (high fre-
quency):
200kHz squarewave (open collector
TTL).
VARIABLE OSCILLATOR OUTPUT (high fre-
quency):
200 to 240kHz squarewave (open collector
TTL).
PREAMPLIFIER INPUTS:
Voltage: BNC connector on rear panel.
Input Impedance: 1 MQ
Charge: TNC connector on
rear
panel, suit-
able for
use
with B
& K
force transducers and
Uni-Gain® accelerometers.
INPUT SENSITIVITIES:
Vibration: 1 mV/ms-
2
,
1
pC/ms-
2 ,
3,16pC/ms-
2 ,
10pC/ms-
2
,
31
,6pC/ms-
2
Force: 1 mV/N, 4pC/N,
All charge sensitivities can be adjusted
+
5 to
-8%
Further detailed
specifications of
Brtiel
&
Kjrer
instruments
Type
5686,
5885,
5887 and 5888
are
available in
individual
System
Development
sheets.
Input Sensitivity
Maximum Input
4pC/N
3,16
x
10
4
pC
Peak
1
pC/ms-
2
1
x
10
4
pC
Peak
3,16pC/ms-
2
3,16
x
10
4
pC
Peak
10pC/ms-
2
'
1
x
10
5
pC Peak
31 ,6 pC/ms-
2
3,1
6
x
10
5
pC Peak
1
mV/N
10V Peak
1
mV/ms-
2
10V
Peak
T01151GBO
MEASUREMENT RANGES:
Acceleration: 0,1
to 9 990 ms-
2
(1 Hz to
10kHz)
Velocity: 0,1mms-
1
to 9,99ms-
1
Displacement: 10
J.Lm
to 99,9 mm
Force: 0,1 to 7 900 N
(1
Hz to 10kHz)
The frequency
limitations
for the velocity and
displacement
ranges
are shown on page 8.
PREAMP OUTPUT:
Sensitivities: +5%, -8% (in accordance with
input
sensitivity adjustment)
Vibration: 1 mV /ms-
2
Force: Direct 1 mV /N, Charge 1,26 mV /N
METER RECTIFIER:
Type: RMS
Dynamic Range: 50 dB (including 1 0 dB top-
factor range)
Time Constant: 0,3, 1,
3,
10 s
(controlled
by
generator frequency or direct setting)
7
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