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Fig. 17. Control Signal Selector Type 5686
tion frequency. The instrument is
shown in Fig. 17.
A set-up for multi-point testing is
shown in Fig. 18. Four accelerometers
measure the 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 then supplies the
selected signal to the compressor sec-
tion of the 1053.
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 feverse 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
0,3Hz.
Sweep rate: 0,001 to 100 Hz/s (lin)
0,001 to 100oct/min (log)
.3 digit resolution.
VARIABLE OUTPUT (low frequency):
0 to 10 V RMS, amplitude controlled manually,
by the compressor or via the interface bus.
Output level: displayed in dB relative to 10V
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:
<-54dB.
Sampling
Frequency
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Vibration Exciter Control
Power Amplifier
Exciter 4802
1053
2708
+ Head
870423
Fig. 18. Instrumentation for multi-point
control
testing
The
Vibration
Exciter
Controls
Type 1053 is supplied in a lightweight
metal cabinet (model A), or in the
same cabinet with flanges for 19" rack
mounting (model C).
Specifications 1 053
Signal/noise:
>
5 dB at output level of
-100dB.
Max load: 1 0 kQ/3 nF.
FIXED OUTPUT (low frequency):
10 V peak - two outputs with 7 V RMS ampli-
tudes and 90° phase
difference.
Phase shift accuracy:
±
1
°
(1 Hz to 1 kHz),
±5°
(1HZ to 10kHZ).
Signal/noise:
>
54 dB.
Max load: 10k!l/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, 4 pC/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
3,16 pC/ms-
2
3,16 x 10
4
pC peak
10pC/ms-
2
1
x
10
5
pc peak
31,6 pC/ms-
2
3,16 x 10
5
pC peak
1 mV/N
10V peak
1 mV/ms-
2
10V peak
T01488GBO
MEASUREMENT RANGES:
Acceleration: 0,1 to 9 990 ms-
2
peak (1 Hz to
10kHz).
Velocity: 0,1mms-
1
to 9,99ms-
1
peak.
Displacement:
10~m
to 99,9mm peak-to-
peak.
Force: 0,1 to 7900N peak (1Hz 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: 50dB (including 10dB top-
factor range).
Time cons1ant: 0,3, 1, 3, 10s (controlled by
generator frequency or direct setting).
7
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