VAST - DC 21

VIBRATION ANALYZER



DC-21 Vibration analyzer – easy-to-use vibration analyzer with a wide arsenal of diagnostic measurements.

Designed to measure the levels and spectral characteristics of vibration for the purpose of condition monitoring, diagnostics, balancing.

The DC-21 is a fully digital, two channel, spectrum analyzer and data collector. It is intended to make:

  • Condition monitoring and diagnostics measurements:

    • time wave form (oscilloscope mode)

    • vibration levels in different frequency bands according to ISO standards, RMS, true peak, peak-peak

    • peak factor

    • autospectra

    • envelope spectra selected from multiple band pass filters

    • rotation speed

    • amplitude and phase of rotation speed and its harmonics

    • long duration time signal recording

  • Rotor balancing (optional)

    • 1, 2, or 3 plane balancing

    • 8 measurement points

    • balancing using known influence coefficients without trial runs

    • utilities for calculation of trial weights, summing, and splitting weights

    • balancing at multiple operating speeds

  • Test diagnostics

    • RPM/amplitude/phase characteristics during machine run-up/coast down (up to 16 channels simultaneously with optional multiplexer)

    • modal analysis, resonant frequencies, logarithmic decrement (damping coefficient) for certain frequencies (optional)

    • shaft alignment shim calculation from the results of measurements with sensors or from dial indicators (optional)

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PRODUCT SPECIFICATIONS

 

Input

Number of Channels

2 analog channels
1 syncronization channel

Input types

ICP® or charge accelerometer (2 ch.)
Linear voltage (2 ch.)
Phase reference tacho (TTL)

Sensor types

accelerometer,
current clamps,
microphone,
tacho probe

Integration

analog (1 stage),
digital (1 or 1 stages)

Frequency range

0.1 – 25600 Hz

Frequency range (+0.5dB)

0.5 – 25600 Hz

Linear input signal range

+\- 3 V

Phase difference between channels

in 2..300 Hz 1 degree or less
in 301..1000Hz 5 degres or less

Between channel interference

– 100 dB or better

Gain

AUTO, 0-54 dB in 6 dB steps

 
Vibration parameters
Measured magnitudesdisplacement,
velocity,
acceleration,
peak-factor
DetectorRMS, true peak, peak-peak
Frequency bands for vibration
ISO standard:2..1000, 10..1000, 10..2000 Hz
additional:2..200, 3..300, 5..500, 10..5000, 500..2500, 625..1250, 1200..2500, 2500..5000, 5000..10000, 10000..25000, 17000..25000 Hz
Vibration rangeacceleration (on 160 Hz) from 0.05 up to 1000 m/s2
velocity (on 80 Hz) from 0.1 up to 100 mm/s
displacement (on 40 Hz) from 1 up to 1000um
 

FFT spectra

Frequency span

25, 50, 100, 200, 400, 800, 1600, 3200, 6400, 12800, 25600 Hz

Frequency resolution

400, 800, 1600 lines

Dynamic range

90 dB or better

Linear averages

1-256

Weighting function

Hanning

Scale Type

Linear or logarythmic

Envelope detector
Band pass filters
with center frequencies

1/3 octave:

800, 1000, 1250, 1600, 2000, 2500, 3200, 4000, 5000,
6400, 8000, 10000, 12800, 16000, 20000 Hz

1/1 octave:

50, 100, 200, 400, 800, 1600, 3200, 6400, 8000, 12800, 16000 Hz

 

Time waveform 

Sampling frequencies

64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536 Hz

Number of samples

200, 400, 1000, 2000, 4000

Envelope detector
Band pass filters
with center frequencies

1/3 octave:

800, 1000, 1250, 1600, 2000, 2500, 3200, 4000, 5000,
6400, 8000, 10000, 12800, 16000, 20000 Hz

1/1 octave:

50, 100, 200, 400, 800, 1600, 3200, 6400, 8000, 12800, 16000 Hz

 

Amplitude and Phase measurements

Frequency range

0.5-1700 Hz (30-102000 RPM)

RPM error

+ 1%

Phase measurement error

+ 5 degrees

Amplitude error

+ 1 dB

Automatic control

tacho signal parameters
reliability of measurements

Amplitude measurement units

G, m/s2, mm/s, mm, in/s2, in/s, mil
RMS, Peak, or Peak to Peak

Internal power supply for
phase reference tacho

5 V DC, 15 mA

 

Overall Measurements

Bands

2-1000 Hz, 10-1,000 Hz, 10-20,000 Hz, 10-5,000 Hz, 
5-10 kHz,10-25 kHz, 2-200 Hz, 5-500 Hz

Detector Type

RMS, Peak, Peak to Peak, Peak Factor

Scale Type

Linear or log

Units

g, m/s^2, mm/s, mm, V, in/s, mils  

 

RPM-amplitude-frequency measurements for run-up/coast-down

Rotation speed range

0.5-1700 Hz (30-102000 RPM)

Frequency range

from 0.5 Hz up to 10xRPM

RPM resolution

up to 200 lines on two harmonics

Measurements are done on

1-6th harmonics of rotation speed

 

General

Operation Temperature

-20 / +50C (5/ 120F)

Weight

0.9 kg

Dimensions

109(W) x 208(L) x 35(H) mm

Battery type

Nickel Metal Hydride

Operation time from batteries

10 hours with reserve battery

Battery full charge time

2 hours

Power management

Adjustable auto shut down
Adjustable auto backlight switch off

Data storage capacity

800 spectra

Interfaces

RS-232

 

 

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