Commtest Instruments vb Series Instrument Reference Manual page 192

Specifications
Accelerometer Input
Number of channels
Type
Sensitivity
Connector
Input impedance
Voltage swing
Sensor excitation current
Sensor excitation voltage
Sensor detection
Tachometer
Sensor
Laser sensor range
Sensor supply
Input type
Pulse rating
Speed range
Display
Parameter Indication
Displays
Maximum levels
Dynamic signal range
Harmonic distortion
Units
Graph types
Magnitude display
Cursors
Accuracy
Frequency response
Spectrum Display
Fmax possible ranges
Fmin possible range
Resolution
Frequency scale
Amplitude scale
Window shapes
Overlap
Number of averages
Averaging types
Demod bandwidths
Waveform Display
Number of samples
Time scale
Time synchronous averages
Keypad Entry
Prompt and unit strings
Input value range
Time Intervals
Measuring time in seconds
(example ranges)
Typical recording time
Trigger Modes
Logging Features
Output formats
Data storage
Data storage format
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Model vb2000
2
2-wire, low impedance piezoelectric
100 mV/g nominal
BNC
>100 kΩ
16 V peak-peak
0 mA or 2.2 mA (configurable)
24 V maximum
Warns if short circuit or not connected
Laser sensor with reflective tape included in kit
10 cm to 2 m nominal
7.2 V nominal 6.0 V to 9.5 V instrument battery
Optically isolated, accepts TTL pulse
2.5 V (4 mA) min, 10 V (27 mA) max, off-state < 0.8 V
30 RPM to 65 000 RPM (0.5 Hz to 1.08 kHz)
RPM, Hz, 1X amplitude and phase angle
Acceleration, velocity, displacement, demodulation
2
± 80 g (800 m/s ), ± 4 in/sec (100 mm/s)
± 400 mil (10 mm)
≥ 95 dB (typical at 400 line resolution)
Less than -70 dB typical
2
g or m/s , in/s or mm/s, mil or mm or µm
AdB, VdB
Spectrum (freq domain), waveform (time domain)
Overall rms value, cursor-position value
Standard cursor
Dual cursors
Harmonic cursor
± 1% (0.1 dB)
± 0.1 dB from 10 Hz to 5 kHz;
± 3 dB from 1 Hz to 20 kHz
0 to (100, 125, 150, 200, 300, 400, 500, 600, 800) Hz
0 to (1, 1.2, 1.6, 2, 2.5, 3, 4, 5, 6, 8, 10, 15, 20) kHz
0 to Fmax
400, 800, 1600, 3200 lines (configurable)
Hz, CPM, orders
Acceleration, velocity, displacement
Hanning, rectangular
(0, 12.5, 25, 37.5, 50, 62.5, 75, 87.5) %
1, 2, 4, 8, 16, 32, 64, 128
Linear, exponential, peak hold, synchronous
20 bandwidth options
1024, 2078, 4096, 8192
10 ms to 32 seconds/1 rev to 30 000 revs
1, 2, 4, 8, 16, 32, 64, 128
16 characters each
± 59 999
Lines
Range 400 800
0 Hz to 100 Hz 4 8
0 Hz to 800 Hz 0.5 1
0 Hz to 4 kHz 0.1 0.2
0 Hz to 20 kHz 0.02 0.04
5 s for 1600 lines, 1600 Hz, 8 averages, 50% overlap
Single (key press), free run
vb screen, transfer to Ascent PC-based software
8 MB non-volatile
Up to 30 folders
Up to 200 named machines per folder
Up to 780 named machines for all folders
Up to 30 multi-axial points per machine
Up to 8 routes per folder
Commonly termed 'ICP® type'
Sensitivity 8.5 mV/g to 2300 mV/g
Safety feature: Break-free inline connector
AC coupled input, allows for ± 8 V sensor output swing (± 80 g)
2.2 mA required for ICP® type accelerometer
At sensor terminals with sensor attached
Channel 1 only
Sensor triggers when the tape reflects its beam
Dependent on size of reflective tape
Available to power sensor. Protected by 0.1 A PTC
Triggers on negative edge
For selected amplitude type, phase angle in degrees
User selectable
∅-peak. Typical, dependent on individual calibration
Acceleration and velocity. Greater with higher resolution and
averaging
Dependent on input level and type. Other distortions and noise
are lower
∅-peak, peak-peak or rms
AdB ref. 1 µg rms, VdB ref. configurable 1.0e-5 mm/s rms or
1.0e-6 mm/s rms
Solid histogram for spectrum, line graph for waveform
Digital readout on chart
Vary x position to display x and y values
Lock standard cursor as reference and display difference
Up to 32 whole-number multiples of standard-cursor frequency
Measured at 100 Hz, 23 ± 5 °C, 400 lines, 400 Hz range
Acceleration and velocity. From value measured at 100 Hz
Or equivalent CPM values
Or orders-based from 1X to 30 000X
vb instrument zeroes all spectral lines below Fmin
1600 lines maximum for dual channel measurements
Linear scale. Can zoom in to display individual spectral lines
Linear or log scales
Dependent on Fmax and number of lines
Increases sampling time proportionally
From 125 Hz to 1250 Hz up to 16 kHz to 20 kHz
Only available when tachometer triggered
1600 3200
16 32 Dependent on number of lines and number of averages (values
2 4 shown in table for no overlap, no averaging, maximum display
0.4 0.8 update rate of 4 per second)
0.08 0.16
Not including initial startup and settling time
Trigger status displayed (busy, done, run, stop)
Total of 8 000 spectra at 400 line resolution or 1000 spectra at
3200 line resolution
User-specified machine, point, and axis names (16 characters)
entered from PC or keypad. Each recording has a unique
time/date stamp
Appendix 2: Specifications 183
Remarks