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DC-21 functional specifications include:
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Input
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Number of Channels
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2 analog channels
1 syncronization channel
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Input types
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ICP® or charge accelerometer (2 ch.)
Linear voltage (2 ch.)
Phase reference tacho (TTL)
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Sensor types
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accelerometer,
current clamps,
microphone,
tacho probe
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Integration
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analog (1 stage),
digital (1 or 1 stages)
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Frequency range
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0.1 - 25600 Hz
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Frequency range (+0.5dB)
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0.5 - 25600 Hz
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Linear input signal range
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+\- 3 V
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Phase difference between channels
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in 2..300 Hz 1 degree or less
in 301..1000Hz 5 degres or less
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Between channel interference
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- 100 dB or better
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Gain
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AUTO, 0-54 dB in 6 dB steps
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| Vibration parameters |
| Measured magnitudes |
displacement,
velocity,
acceleration,
peak-factor |
| Detector |
RMS, true peak, peak-peak |
| Frequency bands for vibration |
| ISO standard: | 2..1000, 10..1000, 10..2000 Hz |
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| additional: | 2..200, 3..300, 5..500, 10..5000, 500..2500, 625..1250, 1200..2500, 2500..5000, 5000..10000, 10000..25000, 17000..25000 Hz |
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| Vibration range |
acceleration (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
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FFT spectra
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Frequency span
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25, 50, 100, 200, 400, 800, 1600,
3200, 6400, 12800, 25600 Hz
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Frequency resolution
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400, 800, 1600 lines
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Dynamic range
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90 dB or better
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Linear averages
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1-256
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Weighting function
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Hanning
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Scale Type
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Linear or logarythmic
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Envelope
detector
Band pass filters
with center frequencies
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1/3 octave:
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800, 1000,
1250, 1600, 2000, 2500, 3200, 4000, 5000,
6400, 8000, 10000, 12800, 16000, 20000 Hz
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1/1 octave:
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50, 100, 200, 400, 800, 1600, 3200, 6400, 8000, 12800, 16000 Hz
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Time
waveform
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Sampling frequencies
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64, 128, 256, 512, 1024, 2048,
4096, 8192, 16384, 32768, 65536 Hz
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Number of samples
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200, 400, 1000, 2000, 4000
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Envelope
detector
Band pass filters
with center frequencies
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1/3 octave:
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800, 1000,
1250, 1600, 2000, 2500, 3200, 4000, 5000,
6400, 8000, 10000, 12800, 16000, 20000 Hz
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1/1 octave:
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50, 100, 200, 400, 800, 1600, 3200, 6400, 8000, 12800, 16000 Hz
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Amplitude
and Phase measurements
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Frequency range
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0.5-1700 Hz (30-102000 RPM)
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RPM error
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+ 1%
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Phase measurement
error
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+ 5 degrees
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Amplitude error
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+ 1 dB
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Automatic control
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tacho signal parameters
reliability of measurements
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Amplitude measurement
units
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G, m/s2,
mm/s, mm, in/s2,
in/s, mil
RMS, Peak, or Peak to Peak
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Internal power supply
for
phase reference tacho
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5 V DC, 15 mA
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Overall Measurements
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Bands
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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
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Detector Type
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RMS, Peak, Peak to Peak, Peak Factor
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Scale Type
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Linear or log
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Units
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g, m/s^2, mm/s, mm, V, in/s,
mils
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RPM-amplitude-frequency measurements for run-up/coast-down
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Rotation speed range
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0.5-1700 Hz (30-102000 RPM)
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Frequency range
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from 0.5 Hz up to 10xRPM
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RPM resolution
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up to 200 lines on two harmonics
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Measurements are done on
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1-6th harmonics of rotation speed
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General
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Operation Temperature
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-20 / +50C (5/ 120F)
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Weight
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0.9 kg
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Dimensions
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109(W) x 208(L) x 35(H) mm
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Battery type
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Nickel Metal Hydride
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Operation time from
batteries
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10 hours with reserve battery
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Battery full charge
time
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2 hours
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Power management
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Adjustable auto shut down
Adjustable auto backlight switch off
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Data storage capacity
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800 spectra
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Interfaces
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RS-232
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