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› Mae 37
VIBRAMONITOR
SUPPORTED INVESTIGATION
Passive seismic acquisition
Seismic vibration monitoring
24 bit seismograph studied specifically
for monitoring explosions in mines
or quarries, particularly indicated for
recording seismic vibrations.
The data acquisition methods (timed
or with trigger threshold) are set
through the software easily and quickly.
Equipped with graphic display, keyboard,
memory support of Secure Digital
(S.D.) type and internal battery,
seismograph VIBRAMONITOR is particularly
easy to use also in less favourable
environments and conditions.
mae-srl.it/go/vibramonitor
Thanks to the MAE data acquisition
and conversion card, based on one
single A/D signal converter for each
inlet channel (SST technology), it allows
to obtain the best possible resolution
when acquiring the data for
each single inlet channel and it allows
to record and graphically visualize up
to 4 channels, 3 of which coming from
seismic sensors (with single component
or tridimensional), and the remaining
ones from the sound impact
detector.
SPECIFICATIONS
• Converters: 24 bit resolution, sigma- delta
technology
• Dynamic range: 144 dB (theoretical)
• Maximum distortion: +/-0.0010%
• Band width: 2Hz-30KHz
• Common mode rejection: 110dB at 60Hz
• Diaphony: -120dB at 20Hz
• Noise threshold of the programmable amplifier
27nV
• Maximum range of inlet signal: +/-5V
• Inlet impedance at 1000 samples/second:
20MΩ
• Amplification levels: 0dB, 6dB, 12dB, 18dB,
24dB, 30dB, 36dB that can be set singularly
for each channel
• Anti-alias filter: -3dB, 80% of Nyquist frequency,
-80dB
• Pre-trigger time: from 1% to 50% of the event
duration
• Sampling frequencies 100, 500, 1000, 2000
samples per second; 250c/s in continuous recording
• Sampling intervals: 0.5, 1.0, 2.0, 4.0, 10.0 ms
• Length of the event recorded: from 512 to
21504 samples (215sec. at 100c/s or 10.7sec.
at 2000c/s). Depending on SD capacity in continuous
recording
• Delay: not available
• Channels: 3 seismic + 1 acoustic. Possibility to
use from 1 to the maximum number of channels
installed for each acquisition
• Dynamic range of microphone: 106-142dB
• Test on instruments: only in the laboratory.
Internal self-calibration of the converters prior
to each acquisition
• Digital filters: selected automatically based
on the sampling frequency
• Data storage: on removable SD memory, up
to 2 GB
• Trigger: 10 threshold levels for each channel
(minimum 8mV – max. 5V). Up to 3 coincidence
combinations between channels
• Data format: SEG-2 standard (32-bit long integer),
BIN convertible in ASCII
• Power supply: 12V DC. Internal batteries of
2.5Ah. Average absorption: 150mA. Envisaged
for external power supply
• Environmental conditions: -20/80°C
• Display: mono-chromatic graphic LCD 320 x
240 pixel
• Keyboard: 6 charge-transfer buttons
• Sizes: 23.8 x 6.7 x 14.1 cm
• Weight: 1.4 Kg (cables and sensors excluded)