Pd 277 ed1rev0 en.indd
• Mains or battery operation• Low weight• Compact• Rugged construction• Built in self check of hammer fall
The tapping machine Nor277 is the third generation of tapping
machines from Norsonic for performing standardised impact
noise tests (foot fall noise). It incorporates all the experience
from the former generations into a compact, light, yet a rugged
ISO140, part VI, VII and VIII, ASTM E-492, ASTM E-1007 and DIN52210.
unit with the construction based on an extruded aluminium chassis. The hammers are made of harden stainless steel, en-
suring non deformation of the hammer shape even after years
All units are delivered with calibration certiﬁcates.
in use. The unit weight is only 10 kg including the optional bat-tery. Retractable feet ensure easy transportation and storage
The unit has the required ﬁve hammers each weighting
Five in line specially harden stainless steel hammers separated by
500g, with a fall height of 40 mm and 100 ms between each
100 mm. Each hammer has a weight of 500g ±4g. Hammer diameter 30 mm ±0,2 mm. Hammer front radius is 500 mm.
hammer impact. A crystal control ed servo system ensures the correct tapping frequency is maintained at all times and tem-
peratures. A level gauge mounted on the top helps the user to
10 impacts per second, rpm controlled via servo feedback loop.
align the unit when adjusting the fall height.
Effective fall heigh
The tapping machine standards specify the impact velocity of
40 mm (adjustable ±5 mm). A gauge for exact height adjustment is attached to the machine.
the hammer and to ensure this requirement is met the Nor277 continually monitors each hammer. Each hammer is ﬁtted with
a laser sensor to measure the impact velocity to ensure that
85-264 VAC, 47-63 Hz, 120 - 370 VdC, consumption less than
the energy imparted into the test ﬂoor is correct hence the
effects of any friction or misalignments are immediately appar-ent. Each hammer has a LED indicator on the front panel that
indicates when the impact velocity and tapping frequency are
RS232. For computer control. This allows wireless control via standard RS232 to Bluetooth adaptors.
within the requirements of the standard. The user can now be assured that the noise generation system will perform to the
Battery operation (option 1)
requirements of the standards and therefore concentrate on
Built in Lithium Ion rechargeable batteries.
the other aspects of the measurement.
Battery life: > 1 hour Charging time: 2 hours
Wireless remote control (option 2)
The unit can be equipped with an internal battery (Option 1) that
Operating frequency: 433 MHz EMC compliant for use in Europe
wil run the unit for approximately one hour. The battery is of the
lithium-ion type and is automatical y charged while the unit is
connected to mains. A three step LED battery monitor tel s the user about the state of charge. Charging time is 2 hours.
3 retractable and height-adjustable feet with rubber pads.
Wireless Remote control
A wireless remote control (option 2) allows the user to switch
WxHxD feet retracted: 165x230x495 mm (6,5x9,1x19,5")
the unit on/off remotely. The radio range is 100m in free ﬁeld,
WxHxD feet extended: 265x230x495 mm (10,4x9,1x19,5")
which correlates to failure free operation through most thick
concrete constructions. The unit may also be control ed via the RS232 interface and this allows wireless control via standard
RS232 to Bluetooth adaptors. The RS232 interface is a part of
10 kg (22 lb) including battery and wireless remote option
the basic unit and does not require option 2.
Operation: -10 to +40 deg C 90% RH
Storage: -30 to + 70 deg C 90%RH
EMC compliance according to EN50081-1 and EN50082-1
Safety according to EN61010-1 and Machine directive 89/392
Published in: Bol. Soc. Braz. Mat. 20 (1989), 87–99. Singular spaces of matricesand their application in combinatoricsAbstract. We study linear spaces of n × n matrices in which every matrix issingular. Examples are given to illustrate that a characterization of such subspaceswould solve various open problems in combinatorics and in computational algebra. Several important special cases of
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