BRUEL & KJAER 2131 - Page 2

BROEL & KJA:R instruments cover the whole field of sound and vibration measurements .
The main groups are:
ACOUSTICAL MEASl,IREMENTS
Condenser Microphones
Piezoelectric Microphones
Microphone Preamplifiers
Hydrophones
Sound Level Meters
Precision Sound Level Meters
Impulse Sound Level Meters
Noise Dose Meters
Noise Level Analyzers
Standing Wave Apparatus
Calibration Equipment
Reverberation Processors
Sound Sources
ACOUSTICAL RESPONSE TESTING
Sine Generators
Random Noise Generators
Sine-Random Generators
Artificial Voices
Artificial Ears
Artificial Mastoids
Hearing Aid Test Boxes
Audiometer Calibrators
Telephone
Measuring Equipment
Audio Reproduction Test Equipment
Tapping Machines
Turntables
VIBRATrON MEASUREMENTS
Accelerometers
Force Transducers
Impedance Heads
Accelerometer Preamplifiers
Vibration Meters
Accelerometer Calibrators
Magnetic Transducers
Capacitive Transducers
Complex Modulus Apparatus
Bump Recorders
VIBRATION TESTING
Exciter Controls - Sine
Exciter Controls- Sine- Random
Exciter
Equalizers, Random or Shock
Exciters
Power Amplifiers
Programmer Units
Stroboscopes
STRAIN MEASUREMENTS
Strain Gauge Apparatus
Multipoint Selectors
MEASUREMENT AND ANALYSIS
Voltmeters
Phase Meters
Deviation Bridges
Measuring Amplifiers
Band-Pass Filter Sets
Frequency Analyzers
Real Time Analyzers
Heterodyne Filters and Analyzers
Distortion Measuring Equipment
Psophometers
Statistical Distribution Analyzers
Tracking Filters
RECORDING
Level Recorders
Frequency Response Tracers
Tape Recorders
Alphanumeric Printers
Digital Event Recorders
DIGITAl. EQUIPMENT
Computers
Tape Punchers
Tape Readers
Bruel & Kjeer
DK-2850 NJERUM, DENMARK · Telephone: + 45 2 80 05 00 · Telex: 37316 bruka dk
Instruction Manual
Digital Frequency Analyzer Type 2131
~
.
033-0178
-
...
llllli
~ ~ - ~ .
iillii
II
--
'• l ..
~ · .. .
II ·1·1 IIi fllliilli I
--- -
-·
2131
A real-time octave and 1/ 3 octave analyzer
featuring almost entirely digital construc-
tion, its operation being based on digit$11 fil-
tering, detection .and averaging techniques.
The detected data
may be averaged either
exponentially or linearly with a constant av-
eraging time across all channels . Addition-
ally, exponential averaging with a constant
confidence level is available. Display of the
final spectrum formed is on an 11" cali-
brated display screen. '·
The 21 31 is equipped with memories en-
abling the comparison of spectra, and has
full analog and digital read-in and read-out
facilities . THe re is also extensive remote pro-
gramming capability, allowing • almost the
complete control of the 21 31 from, e.g ., a
computer.
+ Bri.iel & Kjcer
I
I
-- -. ·---