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The MH-64 & MH-52
Mechanical Sources for
Medium-scaleorehole Seismic Investigations
 The MH-64 and MH-52 are borehole hammers
for geotechnical cross-hole seismic surveys. The seismic
signals are conveyed to the earth through the water
filling the borehole by means of a pulse converter. The
investigation range is from 50 to 150 meters, depending
on the seismic transparency of the rock or soil. The
minimum borehole diameter is 56 mm (BQ) for the MH-52
and 75 mm (NQ) for the MH-64. The recommended depth is
maximum 200m. The hammers are designed to be used in the
‘fast stack’ mode, the blow interval being adjustable
between 1 and 5 seconds. Both models are equipped with
electric motors and piezoelectric trigger sensors with a
timing accuracy of a few tens of microseconds.
Specifications
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Frequency Range:
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200 - 1500 Hz
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Maximum Temperature:
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75° C
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Any hole inclinatione:
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-
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Power:
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220 V/50 Hz - 5A
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MH 62
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MH52
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Working Voltage:
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24 -32 V DC
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24 -32 V DC
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Repetition Rate:
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3 - 6 s
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2 - 6 s
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Maximimum Working Depth:
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250m - unclamped
1000m - clamped
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250m - unclamped
1000m - clamped
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Minimum Hole Diameter:
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62mm
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56mm
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Total Mass:
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35 - 40 kg
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20 - 27 kg
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Hammer Mass:
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1 - 4 kg
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0.8 - 2.8 kg
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Outer Diameter:
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62mm
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52mm
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Length:
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1930 - 2150 mm
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1850 mm
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